Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

11 files changed, 2635 insertions, 0 deletions

diff --git a/lib/pthreadpool/Makefile b/lib/pthreadpool/Makefile
new file mode 100644
index 0000000..48626bd
--- /dev/null
+++ b/lib/pthreadpool/Makefile
@@ -0,0 +1,9 @@
+all: tests
+
+CFLAGS=-O3 -g -Wall
+
+pthreadpool.o: pthreadpool.c pthreadpool.h
+	gcc -c -O3 -o pthreadpool.o pthreadpool.c -I../../..
+
+tests: tests.o pthreadpool.o
+	gcc -o tests tests.o pthreadpool.o -lpthread
\ No newline at end of file
diff --git a/lib/pthreadpool/pthreadpool.c b/lib/pthreadpool/pthreadpool.c
new file mode 100644
index 0000000..cbabec9
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool.c
@@ -0,0 +1,863 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * thread pool implementation
+ * Copyright (C) Volker Lendecke 2009
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "replace.h"
+#include "system/time.h"
+#include "system/wait.h"
+#include "system/threads.h"
+#include "system/filesys.h"
+#include "pthreadpool.h"
+#include "lib/util/dlinklist.h"
+
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+
+#include <assert.h>
+
+struct pthreadpool_job {
+	int id;
+	void (*fn)(void *private_data);
+	void *private_data;
+};
+
+struct pthreadpool {
+	/*
+	 * List pthreadpools for fork safety
+	 */
+	struct pthreadpool *prev, *next;
+
+	/*
+	 * Control access to this struct
+	 */
+	pthread_mutex_t mutex;
+
+	/*
+	 * Threads waiting for work do so here
+	 */
+	pthread_cond_t condvar;
+
+	/*
+	 * Array of jobs
+	 */
+	size_t jobs_array_len;
+	struct pthreadpool_job *jobs;
+
+	size_t head;
+	size_t num_jobs;
+
+	/*
+	 * Indicate job completion
+	 */
+	int (*signal_fn)(int jobid,
+			 void (*job_fn)(void *private_data),
+			 void *job_fn_private_data,
+			 void *private_data);
+	void *signal_fn_private_data;
+
+	/*
+	 * indicator to worker threads to stop processing further jobs
+	 * and exit.
+	 */
+	bool stopped;
+
+	/*
+	 * indicator to the last worker thread to free the pool
+	 * resources.
+	 */
+	bool destroyed;
+
+	/*
+	 * maximum number of threads
+	 * 0 means no real thread, only strict sync processing.
+	 */
+	unsigned max_threads;
+
+	/*
+	 * Number of threads
+	 */
+	unsigned num_threads;
+
+	/*
+	 * Number of idle threads
+	 */
+	unsigned num_idle;
+
+	/*
+	 * Condition variable indicating that helper threads should
+	 * quickly go away making way for fork() without anybody
+	 * waiting on pool->condvar.
+	 */
+	pthread_cond_t *prefork_cond;
+
+	/*
+	 * Waiting position for helper threads while fork is
+	 * running. The forking thread will have locked it, and all
+	 * idle helper threads will sit here until after the fork,
+	 * where the forking thread will unlock it again.
+	 */
+	pthread_mutex_t fork_mutex;
+};
+
+static pthread_mutex_t pthreadpools_mutex = PTHREAD_MUTEX_INITIALIZER;
+static struct pthreadpool *pthreadpools = NULL;
+static pthread_once_t pthreadpool_atfork_initialized = PTHREAD_ONCE_INIT;
+
+static void pthreadpool_prep_atfork(void);
+
+/*
+ * Initialize a thread pool
+ */
+
+int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult,
+		     int (*signal_fn)(int jobid,
+				      void (*job_fn)(void *private_data),
+				      void *job_fn_private_data,
+				      void *private_data),
+		     void *signal_fn_private_data)
+{
+	struct pthreadpool *pool;
+	int ret;
+
+	pool = (struct pthreadpool *)malloc(sizeof(struct pthreadpool));
+	if (pool == NULL) {
+		return ENOMEM;
+	}
+	pool->signal_fn = signal_fn;
+	pool->signal_fn_private_data = signal_fn_private_data;
+
+	pool->jobs_array_len = 4;
+	pool->jobs = calloc(
+		pool->jobs_array_len, sizeof(struct pthreadpool_job));
+
+	if (pool->jobs == NULL) {
+		free(pool);
+		return ENOMEM;
+	}
+
+	pool->head = pool->num_jobs = 0;
+
+	ret = pthread_mutex_init(&pool->mutex, NULL);
+	if (ret != 0) {
+		free(pool->jobs);
+		free(pool);
+		return ret;
+	}
+
+	ret = pthread_cond_init(&pool->condvar, NULL);
+	if (ret != 0) {
+		pthread_mutex_destroy(&pool->mutex);
+		free(pool->jobs);
+		free(pool);
+		return ret;
+	}
+
+	ret = pthread_mutex_init(&pool->fork_mutex, NULL);
+	if (ret != 0) {
+		pthread_cond_destroy(&pool->condvar);
+		pthread_mutex_destroy(&pool->mutex);
+		free(pool->jobs);
+		free(pool);
+		return ret;
+	}
+
+	pool->stopped = false;
+	pool->destroyed = false;
+	pool->num_threads = 0;
+	pool->max_threads = max_threads;
+	pool->num_idle = 0;
+	pool->prefork_cond = NULL;
+
+	ret = pthread_mutex_lock(&pthreadpools_mutex);
+	if (ret != 0) {
+		pthread_mutex_destroy(&pool->fork_mutex);
+		pthread_cond_destroy(&pool->condvar);
+		pthread_mutex_destroy(&pool->mutex);
+		free(pool->jobs);
+		free(pool);
+		return ret;
+	}
+	DLIST_ADD(pthreadpools, pool);
+
+	ret = pthread_mutex_unlock(&pthreadpools_mutex);
+	assert(ret == 0);
+
+	pthread_once(&pthreadpool_atfork_initialized, pthreadpool_prep_atfork);
+
+	*presult = pool;
+
+	return 0;
+}
+
+size_t pthreadpool_max_threads(struct pthreadpool *pool)
+{
+	if (pool->stopped) {
+		return 0;
+	}
+
+	return pool->max_threads;
+}
+
+size_t pthreadpool_queued_jobs(struct pthreadpool *pool)
+{
+	int res;
+	int unlock_res;
+	size_t ret;
+
+	if (pool->stopped) {
+		return 0;
+	}
+
+	res = pthread_mutex_lock(&pool->mutex);
+	if (res != 0) {
+		return res;
+	}
+
+	if (pool->stopped) {
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return 0;
+	}
+
+	ret = pool->num_jobs;
+
+	unlock_res = pthread_mutex_unlock(&pool->mutex);
+	assert(unlock_res == 0);
+	return ret;
+}
+
+static void pthreadpool_prepare_pool(struct pthreadpool *pool)
+{
+	int ret;
+
+	ret = pthread_mutex_lock(&pool->fork_mutex);
+	assert(ret == 0);
+
+	ret = pthread_mutex_lock(&pool->mutex);
+	assert(ret == 0);
+
+	while (pool->num_idle != 0) {
+		unsigned num_idle = pool->num_idle;
+		pthread_cond_t prefork_cond;
+
+		ret = pthread_cond_init(&prefork_cond, NULL);
+		assert(ret == 0);
+
+		/*
+		 * Push all idle threads off pool->condvar. In the
+		 * child we can destroy the pool, which would result
+		 * in undefined behaviour in the
+		 * pthread_cond_destroy(pool->condvar). glibc just
+		 * blocks here.
+		 */
+		pool->prefork_cond = &prefork_cond;
+
+		ret = pthread_cond_signal(&pool->condvar);
+		assert(ret == 0);
+
+		while (pool->num_idle == num_idle) {
+			ret = pthread_cond_wait(&prefork_cond, &pool->mutex);
+			assert(ret == 0);
+		}
+
+		pool->prefork_cond = NULL;
+
+		ret = pthread_cond_destroy(&prefork_cond);
+		assert(ret == 0);
+	}
+
+	/*
+	 * Probably it's well-defined somewhere: What happens to
+	 * condvars after a fork? The rationale of pthread_atfork only
+	 * writes about mutexes. So better be safe than sorry and
+	 * destroy/reinit pool->condvar across a fork.
+	 */
+
+	ret = pthread_cond_destroy(&pool->condvar);
+	assert(ret == 0);
+}
+
+static void pthreadpool_prepare(void)
+{
+	int ret;
+	struct pthreadpool *pool;
+
+	ret = pthread_mutex_lock(&pthreadpools_mutex);
+	assert(ret == 0);
+
+	pool = pthreadpools;
+
+	while (pool != NULL) {
+		pthreadpool_prepare_pool(pool);
+		pool = pool->next;
+	}
+}
+
+static void pthreadpool_parent(void)
+{
+	int ret;
+	struct pthreadpool *pool;
+
+	for (pool = DLIST_TAIL(pthreadpools);
+	     pool != NULL;
+	     pool = DLIST_PREV(pool)) {
+		ret = pthread_cond_init(&pool->condvar, NULL);
+		assert(ret == 0);
+		ret = pthread_mutex_unlock(&pool->mutex);
+		assert(ret == 0);
+		ret = pthread_mutex_unlock(&pool->fork_mutex);
+		assert(ret == 0);
+	}
+
+	ret = pthread_mutex_unlock(&pthreadpools_mutex);
+	assert(ret == 0);
+}
+
+static void pthreadpool_child(void)
+{
+	int ret;
+	struct pthreadpool *pool;
+
+	for (pool = DLIST_TAIL(pthreadpools);
+	     pool != NULL;
+	     pool = DLIST_PREV(pool)) {
+
+		pool->num_threads = 0;
+		pool->num_idle = 0;
+		pool->head = 0;
+		pool->num_jobs = 0;
+		pool->stopped = true;
+
+		ret = pthread_cond_init(&pool->condvar, NULL);
+		assert(ret == 0);
+
+		ret = pthread_mutex_unlock(&pool->mutex);
+		assert(ret == 0);
+
+		ret = pthread_mutex_unlock(&pool->fork_mutex);
+		assert(ret == 0);
+	}
+
+	ret = pthread_mutex_unlock(&pthreadpools_mutex);
+	assert(ret == 0);
+}
+
+static void pthreadpool_prep_atfork(void)
+{
+	pthread_atfork(pthreadpool_prepare, pthreadpool_parent,
+		       pthreadpool_child);
+}
+
+static int pthreadpool_free(struct pthreadpool *pool)
+{
+	int ret, ret1, ret2;
+
+	ret = pthread_mutex_lock(&pthreadpools_mutex);
+	if (ret != 0) {
+		return ret;
+	}
+	DLIST_REMOVE(pthreadpools, pool);
+	ret = pthread_mutex_unlock(&pthreadpools_mutex);
+	assert(ret == 0);
+
+	ret = pthread_mutex_lock(&pool->mutex);
+	assert(ret == 0);
+	ret = pthread_mutex_unlock(&pool->mutex);
+	assert(ret == 0);
+
+	ret = pthread_mutex_destroy(&pool->mutex);
+	ret1 = pthread_cond_destroy(&pool->condvar);
+	ret2 = pthread_mutex_destroy(&pool->fork_mutex);
+
+	if (ret != 0) {
+		return ret;
+	}
+	if (ret1 != 0) {
+		return ret1;
+	}
+	if (ret2 != 0) {
+		return ret2;
+	}
+
+	free(pool->jobs);
+	free(pool);
+
+	return 0;
+}
+
+/*
+ * Stop a thread pool. Wake up all idle threads for exit.
+ */
+
+static int pthreadpool_stop_locked(struct pthreadpool *pool)
+{
+	int ret;
+
+	pool->stopped = true;
+
+	if (pool->num_threads == 0) {
+		return 0;
+	}
+
+	/*
+	 * We have active threads, tell them to finish.
+	 */
+
+	ret = pthread_cond_broadcast(&pool->condvar);
+
+	return ret;
+}
+
+/*
+ * Stop a thread pool. Wake up all idle threads for exit.
+ */
+
+int pthreadpool_stop(struct pthreadpool *pool)
+{
+	int ret, ret1;
+
+	ret = pthread_mutex_lock(&pool->mutex);
+	if (ret != 0) {
+		return ret;
+	}
+
+	if (!pool->stopped) {
+		ret = pthreadpool_stop_locked(pool);
+	}
+
+	ret1 = pthread_mutex_unlock(&pool->mutex);
+	assert(ret1 == 0);
+
+	return ret;
+}
+
+/*
+ * Destroy a thread pool. Wake up all idle threads for exit. The last
+ * one will free the pool.
+ */
+
+int pthreadpool_destroy(struct pthreadpool *pool)
+{
+	int ret, ret1;
+	bool free_it;
+
+	assert(!pool->destroyed);
+
+	ret = pthread_mutex_lock(&pool->mutex);
+	if (ret != 0) {
+		return ret;
+	}
+
+	pool->destroyed = true;
+
+	if (!pool->stopped) {
+		ret = pthreadpool_stop_locked(pool);
+	}
+
+	free_it = (pool->num_threads == 0);
+
+	ret1 = pthread_mutex_unlock(&pool->mutex);
+	assert(ret1 == 0);
+
+	if (free_it) {
+		pthreadpool_free(pool);
+	}
+
+	return ret;
+}
+/*
+ * Prepare for pthread_exit(), pool->mutex must be locked and will be
+ * unlocked here. This is a bit of a layering violation, but here we
+ * also take care of removing the pool if we're the last thread.
+ */
+static void pthreadpool_server_exit(struct pthreadpool *pool)
+{
+	int ret;
+	bool free_it;
+
+	pool->num_threads -= 1;
+
+	free_it = (pool->destroyed && (pool->num_threads == 0));
+
+	ret = pthread_mutex_unlock(&pool->mutex);
+	assert(ret == 0);
+
+	if (free_it) {
+		pthreadpool_free(pool);
+	}
+}
+
+static bool pthreadpool_get_job(struct pthreadpool *p,
+				struct pthreadpool_job *job)
+{
+	if (p->stopped) {
+		return false;
+	}
+
+	if (p->num_jobs == 0) {
+		return false;
+	}
+	*job = p->jobs[p->head];
+	p->head = (p->head+1) % p->jobs_array_len;
+	p->num_jobs -= 1;
+	return true;
+}
+
+static bool pthreadpool_put_job(struct pthreadpool *p,
+				int id,
+				void (*fn)(void *private_data),
+				void *private_data)
+{
+	struct pthreadpool_job *job;
+
+	if (p->num_jobs == p->jobs_array_len) {
+		struct pthreadpool_job *tmp;
+		size_t new_len = p->jobs_array_len * 2;
+
+		tmp = realloc(
+			p->jobs, sizeof(struct pthreadpool_job) * new_len);
+		if (tmp == NULL) {
+			return false;
+		}
+		p->jobs = tmp;
+
+		/*
+		 * We just doubled the jobs array. The array implements a FIFO
+		 * queue with a modulo-based wraparound, so we have to memcpy
+		 * the jobs that are logically at the queue end but physically
+		 * before the queue head into the reallocated area. The new
+		 * space starts at the current jobs_array_len, and we have to
+		 * copy everything before the current head job into the new
+		 * area.
+		 */
+		memcpy(&p->jobs[p->jobs_array_len], p->jobs,
+		       sizeof(struct pthreadpool_job) * p->head);
+
+		p->jobs_array_len = new_len;
+	}
+
+	job = &p->jobs[(p->head + p->num_jobs) % p->jobs_array_len];
+	job->id = id;
+	job->fn = fn;
+	job->private_data = private_data;
+
+	p->num_jobs += 1;
+
+	return true;
+}
+
+static void pthreadpool_undo_put_job(struct pthreadpool *p)
+{
+	p->num_jobs -= 1;
+}
+
+static void *pthreadpool_server(void *arg)
+{
+	struct pthreadpool *pool = (struct pthreadpool *)arg;
+	int res;
+
+	res = pthread_mutex_lock(&pool->mutex);
+	if (res != 0) {
+		return NULL;
+	}
+
+	while (1) {
+		struct timespec ts;
+		struct pthreadpool_job job;
+
+		/*
+		 * idle-wait at most 1 second. If nothing happens in that
+		 * time, exit this thread.
+		 */
+
+		clock_gettime(CLOCK_REALTIME, &ts);
+		ts.tv_sec += 1;
+
+		while ((pool->num_jobs == 0) && !pool->stopped) {
+
+			pool->num_idle += 1;
+			res = pthread_cond_timedwait(
+				&pool->condvar, &pool->mutex, &ts);
+			pool->num_idle -= 1;
+
+			if (pool->prefork_cond != NULL) {
+				/*
+				 * Me must allow fork() to continue
+				 * without anybody waiting on
+				 * &pool->condvar. Tell
+				 * pthreadpool_prepare_pool that we
+				 * got that message.
+				 */
+
+				res = pthread_cond_signal(pool->prefork_cond);
+				assert(res == 0);
+
+				res = pthread_mutex_unlock(&pool->mutex);
+				assert(res == 0);
+
+				/*
+				 * pthreadpool_prepare_pool has
+				 * already locked this mutex across
+				 * the fork. This makes us wait
+				 * without sitting in a condvar.
+				 */
+				res = pthread_mutex_lock(&pool->fork_mutex);
+				assert(res == 0);
+				res = pthread_mutex_unlock(&pool->fork_mutex);
+				assert(res == 0);
+
+				res = pthread_mutex_lock(&pool->mutex);
+				assert(res == 0);
+			}
+
+			if (res == ETIMEDOUT) {
+
+				if (pool->num_jobs == 0) {
+					/*
+					 * we timed out and still no work for
+					 * us. Exit.
+					 */
+					pthreadpool_server_exit(pool);
+					return NULL;
+				}
+
+				break;
+			}
+			assert(res == 0);
+		}
+
+		if (pthreadpool_get_job(pool, &job)) {
+			int ret;
+
+			/*
+			 * Do the work with the mutex unlocked
+			 */
+
+			res = pthread_mutex_unlock(&pool->mutex);
+			assert(res == 0);
+
+			job.fn(job.private_data);
+
+			ret = pool->signal_fn(job.id,
+					      job.fn, job.private_data,
+					      pool->signal_fn_private_data);
+
+			res = pthread_mutex_lock(&pool->mutex);
+			assert(res == 0);
+
+			if (ret != 0) {
+				pthreadpool_server_exit(pool);
+				return NULL;
+			}
+		}
+
+		if (pool->stopped) {
+			/*
+			 * we're asked to stop processing jobs, so exit
+			 */
+			pthreadpool_server_exit(pool);
+			return NULL;
+		}
+	}
+}
+
+static int pthreadpool_create_thread(struct pthreadpool *pool)
+{
+	pthread_attr_t thread_attr;
+	pthread_t thread_id;
+	int res;
+	sigset_t mask, omask;
+
+	/*
+	 * Create a new worker thread. It should not receive any signals.
+	 */
+
+	sigfillset(&mask);
+
+	res = pthread_attr_init(&thread_attr);
+	if (res != 0) {
+		return res;
+	}
+
+	res = pthread_attr_setdetachstate(
+		&thread_attr, PTHREAD_CREATE_DETACHED);
+	if (res != 0) {
+		pthread_attr_destroy(&thread_attr);
+		return res;
+	}
+
+	res = pthread_sigmask(SIG_BLOCK, &mask, &omask);
+	if (res != 0) {
+		pthread_attr_destroy(&thread_attr);
+		return res;
+	}
+
+	res = pthread_create(&thread_id, &thread_attr, pthreadpool_server,
+			     (void *)pool);
+
+	assert(pthread_sigmask(SIG_SETMASK, &omask, NULL) == 0);
+
+	pthread_attr_destroy(&thread_attr);
+
+	if (res == 0) {
+		pool->num_threads += 1;
+	}
+
+	return res;
+}
+
+int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
+			void (*fn)(void *private_data), void *private_data)
+{
+	int res;
+	int unlock_res;
+
+	assert(!pool->destroyed);
+
+	res = pthread_mutex_lock(&pool->mutex);
+	if (res != 0) {
+		return res;
+	}
+
+	if (pool->stopped) {
+		/*
+		 * Protect against the pool being shut down while
+		 * trying to add a job
+		 */
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return EINVAL;
+	}
+
+	if (pool->max_threads == 0) {
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+
+		/*
+		 * If no thread are allowed we do strict sync processing.
+		 */
+		fn(private_data);
+		res = pool->signal_fn(job_id, fn, private_data,
+				      pool->signal_fn_private_data);
+		return res;
+	}
+
+	/*
+	 * Add job to the end of the queue
+	 */
+	if (!pthreadpool_put_job(pool, job_id, fn, private_data)) {
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return ENOMEM;
+	}
+
+	if (pool->num_idle > 0) {
+		/*
+		 * We have idle threads, wake one.
+		 */
+		res = pthread_cond_signal(&pool->condvar);
+		if (res != 0) {
+			pthreadpool_undo_put_job(pool);
+		}
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return res;
+	}
+
+	if (pool->num_threads >= pool->max_threads) {
+		/*
+		 * No more new threads, we just queue the request
+		 */
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return 0;
+	}
+
+	res = pthreadpool_create_thread(pool);
+	if (res == 0) {
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return 0;
+	}
+
+	if (pool->num_threads != 0) {
+		/*
+		 * At least one thread is still available, let
+		 * that one run the queued job.
+		 */
+		unlock_res = pthread_mutex_unlock(&pool->mutex);
+		assert(unlock_res == 0);
+		return 0;
+	}
+
+	pthreadpool_undo_put_job(pool);
+
+	unlock_res = pthread_mutex_unlock(&pool->mutex);
+	assert(unlock_res == 0);
+
+	return res;
+}
+
+size_t pthreadpool_cancel_job(struct pthreadpool *pool, int job_id,
+			      void (*fn)(void *private_data), void *private_data)
+{
+	int res;
+	size_t i, j;
+	size_t num = 0;
+
+	assert(!pool->destroyed);
+
+	res = pthread_mutex_lock(&pool->mutex);
+	if (res != 0) {
+		return res;
+	}
+
+	for (i = 0, j = 0; i < pool->num_jobs; i++) {
+		size_t idx = (pool->head + i) % pool->jobs_array_len;
+		size_t new_idx = (pool->head + j) % pool->jobs_array_len;
+		struct pthreadpool_job *job = &pool->jobs[idx];
+
+		if ((job->private_data == private_data) &&
+		    (job->id == job_id) &&
+		    (job->fn == fn))
+		{
+			/*
+			 * Just skip the entry.
+			 */
+			num++;
+			continue;
+		}
+
+		/*
+		 * If we already removed one or more jobs (so j will be smaller
+		 * then i), we need to fill possible gaps in the logical list.
+		 */
+		if (j < i) {
+			pool->jobs[new_idx] = *job;
+		}
+		j++;
+	}
+
+	pool->num_jobs -= num;
+
+	res = pthread_mutex_unlock(&pool->mutex);
+	assert(res == 0);
+
+	return num;
+}
diff --git a/lib/pthreadpool/pthreadpool.h b/lib/pthreadpool/pthreadpool.h
new file mode 100644
index 0000000..b473358
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool.h
@@ -0,0 +1,158 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * threadpool implementation based on pthreads
+ * Copyright (C) Volker Lendecke 2009,2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PTHREADPOOL_H__
+#define __PTHREADPOOL_H__
+
+struct pthreadpool;
+
+/**
+ * @defgroup pthreadpool The pthreadpool API
+ *
+ * This API provides a way to run threadsafe functions in a helper
+ * thread. It is initially intended to run getaddrinfo asynchronously.
+ */
+
+
+/**
+ * @brief Create a pthreadpool
+ *
+ * A struct pthreadpool is the basis for for running threads in the
+ * background.
+ *
+ * @param[in]	max_threads	Maximum parallelism in this pool
+ * @param[out]	presult		Pointer to the threadpool returned
+ * @return			success: 0, failure: errno
+ *
+ * max_threads=0 means unlimited parallelism. The caller has to take
+ * care to not overload the system.
+ */
+int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult,
+		     int (*signal_fn)(int jobid,
+				      void (*job_fn)(void *private_data),
+				      void *job_fn_private_data,
+				      void *private_data),
+		     void *signal_fn_private_data);
+
+/**
+ * @brief Get the max threads value of pthreadpool
+ *
+ * @note This can be 0 for strict sync processing.
+ *
+ * @param[in]	pool		The pool
+ * @return			number of possible threads
+ */
+size_t pthreadpool_max_threads(struct pthreadpool *pool);
+
+/**
+ * @brief The number of queued jobs of pthreadpool
+ *
+ * This is the number of jobs added by pthreadpool_add_job(),
+ * which are not yet processed by a thread.
+ *
+ * @param[in]	pool		The pool
+ * @return			The number of jobs
+ */
+size_t pthreadpool_queued_jobs(struct pthreadpool *pool);
+
+/**
+ * @brief Stop a pthreadpool
+ *
+ * Stop a pthreadpool. If jobs are submitted, but not yet active in
+ * a thread, they won't get executed. If a job has already been
+ * submitted to a thread, the job function will continue running, and
+ * the signal function might still be called.
+ *
+ * This allows a multi step shutdown using pthreadpool_stop(),
+ * pthreadpool_cancel_job() and pthreadpool_destroy().
+ *
+ * @param[in]	pool		The pool to stop
+ * @return			success: 0, failure: errno
+ *
+ * @see pthreadpool_cancel_job()
+ * @see pthreadpool_destroy()
+ */
+int pthreadpool_stop(struct pthreadpool *pool);
+
+/**
+ * @brief Destroy a pthreadpool
+ *
+ * This basically implies pthreadpool_stop() if the pool
+ * isn't already stopped.
+ *
+ * Destroy a pthreadpool. If jobs are submitted, but not yet active in
+ * a thread, they won't get executed. If a job has already been
+ * submitted to a thread, the job function will continue running, and
+ * the signal function might still be called. The caller of
+ * pthreadpool_init must make sure the required resources are still
+ * around when the pool is destroyed with pending jobs.  The last
+ * thread to exit will finally free() the pool memory.
+ *
+ * @param[in]	pool		The pool to destroy
+ * @return			success: 0, failure: errno
+ *
+ * @see pthreadpool_stop()
+ */
+int pthreadpool_destroy(struct pthreadpool *pool);
+
+/**
+ * @brief Add a job to a pthreadpool
+ *
+ * This adds a job to a pthreadpool. The job can be identified by
+ * job_id. This integer will be passed to signal_fn() when the
+ * job is completed.
+ *
+ * @param[in]	pool		The pool to run the job on
+ * @param[in]	job_id		A custom identifier
+ * @param[in]	fn		The function to run asynchronously
+ * @param[in]	private_data	Pointer passed to fn
+ * @return			success: 0, failure: errno
+ */
+int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
+			void (*fn)(void *private_data), void *private_data);
+
+/**
+ * @brief Try to cancel a job in a pthreadpool
+ *
+ * This tries to cancel a job in a pthreadpool. The same
+ * arguments, which were given to pthreadpool_add_job()
+ * needs to be passed.
+ *
+ * The combination of id, fn, private_data might not be unique.
+ * So the function tries to cancel as much matching jobs as possible.
+ * Note once a job is scheduled in a thread it's to late to
+ * cancel it.
+ *
+ * Canceled jobs that weren't started yet won't be reported via a
+ * pool's signal_fn.
+ *
+ * @param[in]	pool		The pool to run the job on
+ * @param[in]	job_id		A custom identifier
+ * @param[in]	fn		The function to run asynchronously
+ * @param[in]	private_data	Pointer passed to fn
+ * @return			The number of canceled jobs
+ *
+ * @see pthreadpool_add_job()
+ * @see pthreadpool_stop()
+ * @see pthreadpool_destroy()
+ */
+size_t pthreadpool_cancel_job(struct pthreadpool *pool, int job_id,
+			      void (*fn)(void *private_data), void *private_data);
+
+#endif
diff --git a/lib/pthreadpool/pthreadpool_pipe.c b/lib/pthreadpool/pthreadpool_pipe.c
new file mode 100644
index 0000000..d6d519a
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool_pipe.c
@@ -0,0 +1,202 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * threadpool implementation based on pthreads
+ * Copyright (C) Volker Lendecke 2009,2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "pthreadpool_pipe.h"
+#include "pthreadpool.h"
+
+struct pthreadpool_pipe {
+	struct pthreadpool *pool;
+	int num_jobs;
+	pid_t pid;
+	int pipe_fds[2];
+};
+
+static int pthreadpool_pipe_signal(int jobid,
+				   void (*job_fn)(void *private_data),
+				   void *job_private_data,
+				   void *private_data);
+
+int pthreadpool_pipe_init(unsigned max_threads,
+			  struct pthreadpool_pipe **presult)
+{
+	struct pthreadpool_pipe *pool;
+	int ret;
+
+	pool = calloc(1, sizeof(struct pthreadpool_pipe));
+	if (pool == NULL) {
+		return ENOMEM;
+	}
+	pool->pid = getpid();
+
+	ret = pipe(pool->pipe_fds);
+	if (ret == -1) {
+		int err = errno;
+		free(pool);
+		return err;
+	}
+
+	ret = pthreadpool_init(max_threads, &pool->pool,
+			       pthreadpool_pipe_signal, pool);
+	if (ret != 0) {
+		close(pool->pipe_fds[0]);
+		close(pool->pipe_fds[1]);
+		free(pool);
+		return ret;
+	}
+
+	*presult = pool;
+	return 0;
+}
+
+static int pthreadpool_pipe_signal(int jobid,
+				   void (*job_fn)(void *private_data),
+				   void *job_private_data,
+				   void *private_data)
+{
+	struct pthreadpool_pipe *pool = private_data;
+	ssize_t written;
+
+	do {
+		written = write(pool->pipe_fds[1], &jobid, sizeof(jobid));
+	} while ((written == -1) && (errno == EINTR));
+
+	if (written != sizeof(jobid)) {
+		return errno;
+	}
+
+	return 0;
+}
+
+int pthreadpool_pipe_destroy(struct pthreadpool_pipe *pool)
+{
+	int ret;
+
+	if (pool->num_jobs != 0) {
+		return EBUSY;
+	}
+
+	ret = pthreadpool_destroy(pool->pool);
+	if (ret != 0) {
+		return ret;
+	}
+
+	close(pool->pipe_fds[0]);
+	pool->pipe_fds[0] = -1;
+
+	close(pool->pipe_fds[1]);
+	pool->pipe_fds[1] = -1;
+
+	free(pool);
+	return 0;
+}
+
+static int pthreadpool_pipe_reinit(struct pthreadpool_pipe *pool)
+{
+	pid_t pid = getpid();
+	int signal_fd;
+	int ret;
+
+	if (pid == pool->pid) {
+		return 0;
+	}
+
+	signal_fd = pool->pipe_fds[0];
+
+	close(pool->pipe_fds[0]);
+	pool->pipe_fds[0] = -1;
+
+	close(pool->pipe_fds[1]);
+	pool->pipe_fds[1] = -1;
+
+	ret = pipe(pool->pipe_fds);
+	if (ret != 0) {
+		return errno;
+	}
+
+	ret = dup2(pool->pipe_fds[0], signal_fd);
+	if (ret != 0) {
+		return errno;
+	}
+
+	pool->pipe_fds[0] = signal_fd;
+	pool->num_jobs = 0;
+
+	return 0;
+}
+
+int pthreadpool_pipe_add_job(struct pthreadpool_pipe *pool, int job_id,
+			     void (*fn)(void *private_data),
+			     void *private_data)
+{
+	int ret;
+
+	ret = pthreadpool_pipe_reinit(pool);
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = pthreadpool_add_job(pool->pool, job_id, fn, private_data);
+	if (ret != 0) {
+		return ret;
+	}
+
+	pool->num_jobs += 1;
+
+	return 0;
+}
+
+int pthreadpool_pipe_signal_fd(struct pthreadpool_pipe *pool)
+{
+	return pool->pipe_fds[0];
+}
+
+int pthreadpool_pipe_finished_jobs(struct pthreadpool_pipe *pool, int *jobids,
+				   unsigned num_jobids)
+{
+	ssize_t to_read, nread, num_jobs;
+	pid_t pid = getpid();
+
+	if (pool->pid != pid) {
+		return EINVAL;
+	}
+
+	to_read = sizeof(int) * num_jobids;
+
+	do {
+		nread = read(pool->pipe_fds[0], jobids, to_read);
+	} while ((nread == -1) && (errno == EINTR));
+
+	if (nread == -1) {
+		return -errno;
+	}
+	if ((nread % sizeof(int)) != 0) {
+		return -EINVAL;
+	}
+
+	num_jobs = nread / sizeof(int);
+
+	if (num_jobs > pool->num_jobs) {
+		return -EINVAL;
+	}
+	pool->num_jobs -= num_jobs;
+
+	return num_jobs;
+}
diff --git a/lib/pthreadpool/pthreadpool_pipe.h b/lib/pthreadpool/pthreadpool_pipe.h
new file mode 100644
index 0000000..77516f7
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool_pipe.h
@@ -0,0 +1,39 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * threadpool implementation based on pthreads
+ * Copyright (C) Volker Lendecke 2009,2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PTHREADPOOL_PIPE_H__
+#define __PTHREADPOOL_PIPE_H__
+
+struct pthreadpool_pipe;
+
+int pthreadpool_pipe_init(unsigned max_threads,
+			  struct pthreadpool_pipe **presult);
+
+int pthreadpool_pipe_destroy(struct pthreadpool_pipe *pool);
+
+int pthreadpool_pipe_add_job(struct pthreadpool_pipe *pool, int job_id,
+			     void (*fn)(void *private_data),
+			     void *private_data);
+
+int pthreadpool_pipe_signal_fd(struct pthreadpool_pipe *pool);
+
+int pthreadpool_pipe_finished_jobs(struct pthreadpool_pipe *pool, int *jobids,
+				   unsigned num_jobids);
+
+#endif
diff --git a/lib/pthreadpool/pthreadpool_sync.c b/lib/pthreadpool/pthreadpool_sync.c
new file mode 100644
index 0000000..48e6a0d
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool_sync.c
@@ -0,0 +1,97 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * sync dummy implementation of the pthreadpool API
+ * Copyright (C) Volker Lendecke 2009
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "replace.h"
+#include "pthreadpool.h"
+
+struct pthreadpool {
+	bool stopped;
+
+	/*
+	 * Indicate job completion
+	 */
+	int (*signal_fn)(int jobid,
+			 void (*job_fn)(void *private_data),
+			 void *job_fn_private_data,
+			 void *private_data);
+	void *signal_fn_private_data;
+};
+
+int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult,
+		     int (*signal_fn)(int jobid,
+				      void (*job_fn)(void *private_data),
+				      void *job_fn_private_data,
+				      void *private_data),
+		     void *signal_fn_private_data)
+{
+	struct pthreadpool *pool;
+
+	pool = (struct pthreadpool *)calloc(1, sizeof(struct pthreadpool));
+	if (pool == NULL) {
+		return ENOMEM;
+	}
+	pool->stopped = false;
+	pool->signal_fn = signal_fn;
+	pool->signal_fn_private_data = signal_fn_private_data;
+
+	*presult = pool;
+	return 0;
+}
+
+size_t pthreadpool_max_threads(struct pthreadpool *pool)
+{
+	return 0;
+}
+
+size_t pthreadpool_queued_jobs(struct pthreadpool *pool)
+{
+	return 0;
+}
+
+int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
+			void (*fn)(void *private_data), void *private_data)
+{
+	if (pool->stopped) {
+		return EINVAL;
+	}
+
+	fn(private_data);
+
+	return pool->signal_fn(job_id, fn, private_data,
+			       pool->signal_fn_private_data);
+}
+
+size_t pthreadpool_cancel_job(struct pthreadpool *pool, int job_id,
+			      void (*fn)(void *private_data), void *private_data)
+{
+	return 0;
+}
+
+int pthreadpool_stop(struct pthreadpool *pool)
+{
+	pool->stopped = true;
+	return 0;
+}
+
+int pthreadpool_destroy(struct pthreadpool *pool)
+{
+	free(pool);
+	return 0;
+}
diff --git a/lib/pthreadpool/pthreadpool_tevent.c b/lib/pthreadpool/pthreadpool_tevent.c
new file mode 100644
index 0000000..389bb06
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool_tevent.c
@@ -0,0 +1,428 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * threadpool implementation based on pthreads
+ * Copyright (C) Volker Lendecke 2009,2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "pthreadpool_tevent.h"
+#include "pthreadpool.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/util/dlinklist.h"
+
+struct pthreadpool_tevent_job_state;
+
+/*
+ * We need one pthreadpool_tevent_glue object per unique combintaion of tevent
+ * contexts and pthreadpool_tevent objects. Maintain a list of used tevent
+ * contexts in a pthreadpool_tevent.
+ */
+struct pthreadpool_tevent_glue {
+	struct pthreadpool_tevent_glue *prev, *next;
+	struct pthreadpool_tevent *pool; /* back-pointer to owning object. */
+	/* Tuple we are keeping track of in this list. */
+	struct tevent_context *ev;
+	struct tevent_threaded_context *tctx;
+	/* Pointer to link object owned by *ev. */
+	struct pthreadpool_tevent_glue_ev_link *ev_link;
+};
+
+/*
+ * The pthreadpool_tevent_glue_ev_link and its destructor ensure we remove the
+ * tevent context from our list of active event contexts if the event context
+ * is destroyed.
+ * This structure is talloc()'ed from the struct tevent_context *, and is a
+ * back-pointer allowing the related struct pthreadpool_tevent_glue object
+ * to be removed from the struct pthreadpool_tevent glue list if the owning
+ * tevent_context is talloc_free()'ed.
+ */
+struct pthreadpool_tevent_glue_ev_link {
+	struct pthreadpool_tevent_glue *glue;
+};
+
+struct pthreadpool_tevent {
+	struct pthreadpool *pool;
+	struct pthreadpool_tevent_glue *glue_list;
+
+	struct pthreadpool_tevent_job_state *jobs;
+};
+
+struct pthreadpool_tevent_job_state {
+	struct pthreadpool_tevent_job_state *prev, *next;
+	struct pthreadpool_tevent *pool;
+	struct tevent_context *ev;
+	struct tevent_immediate *im;
+	struct tevent_req *req;
+
+	void (*fn)(void *private_data);
+	void *private_data;
+};
+
+static int pthreadpool_tevent_destructor(struct pthreadpool_tevent *pool);
+
+static int pthreadpool_tevent_job_signal(int jobid,
+					 void (*job_fn)(void *private_data),
+					 void *job_private_data,
+					 void *private_data);
+
+int pthreadpool_tevent_init(TALLOC_CTX *mem_ctx, unsigned max_threads,
+			    struct pthreadpool_tevent **presult)
+{
+	struct pthreadpool_tevent *pool;
+	int ret;
+
+	pool = talloc_zero(mem_ctx, struct pthreadpool_tevent);
+	if (pool == NULL) {
+		return ENOMEM;
+	}
+
+	ret = pthreadpool_init(max_threads, &pool->pool,
+			       pthreadpool_tevent_job_signal, pool);
+	if (ret != 0) {
+		TALLOC_FREE(pool);
+		return ret;
+	}
+
+	talloc_set_destructor(pool, pthreadpool_tevent_destructor);
+
+	*presult = pool;
+	return 0;
+}
+
+size_t pthreadpool_tevent_max_threads(struct pthreadpool_tevent *pool)
+{
+	if (pool->pool == NULL) {
+		return 0;
+	}
+
+	return pthreadpool_max_threads(pool->pool);
+}
+
+size_t pthreadpool_tevent_queued_jobs(struct pthreadpool_tevent *pool)
+{
+	if (pool->pool == NULL) {
+		return 0;
+	}
+
+	return pthreadpool_queued_jobs(pool->pool);
+}
+
+static int pthreadpool_tevent_destructor(struct pthreadpool_tevent *pool)
+{
+	struct pthreadpool_tevent_job_state *state, *next;
+	struct pthreadpool_tevent_glue *glue = NULL;
+	int ret;
+
+	ret = pthreadpool_stop(pool->pool);
+	if (ret != 0) {
+		return ret;
+	}
+
+	for (state = pool->jobs; state != NULL; state = next) {
+		next = state->next;
+		DLIST_REMOVE(pool->jobs, state);
+		state->pool = NULL;
+	}
+
+	/*
+	 * Delete all the registered
+	 * tevent_context/tevent_threaded_context
+	 * pairs.
+	 */
+	for (glue = pool->glue_list; glue != NULL; glue = pool->glue_list) {
+		/* The glue destructor removes it from the list */
+		TALLOC_FREE(glue);
+	}
+	pool->glue_list = NULL;
+
+	ret = pthreadpool_destroy(pool->pool);
+	if (ret != 0) {
+		return ret;
+	}
+	pool->pool = NULL;
+
+	return 0;
+}
+
+static int pthreadpool_tevent_glue_destructor(
+	struct pthreadpool_tevent_glue *glue)
+{
+	if (glue->pool->glue_list != NULL) {
+		DLIST_REMOVE(glue->pool->glue_list, glue);
+	}
+
+	/* Ensure the ev_link destructor knows we're gone */
+	glue->ev_link->glue = NULL;
+
+	TALLOC_FREE(glue->ev_link);
+	TALLOC_FREE(glue->tctx);
+
+	return 0;
+}
+
+/*
+ * Destructor called either explicitly from
+ * pthreadpool_tevent_glue_destructor(), or indirectly
+ * when owning tevent_context is destroyed.
+ *
+ * When called from pthreadpool_tevent_glue_destructor()
+ * ev_link->glue is already NULL, so this does nothing.
+ *
+ * When called from talloc_free() of the owning
+ * tevent_context we must ensure we also remove the
+ * linked glue object from the list inside
+ * struct pthreadpool_tevent.
+ */
+static int pthreadpool_tevent_glue_link_destructor(
+	struct pthreadpool_tevent_glue_ev_link *ev_link)
+{
+	TALLOC_FREE(ev_link->glue);
+	return 0;
+}
+
+static int pthreadpool_tevent_register_ev(struct pthreadpool_tevent *pool,
+					  struct tevent_context *ev)
+{
+	struct pthreadpool_tevent_glue *glue = NULL;
+	struct pthreadpool_tevent_glue_ev_link *ev_link = NULL;
+
+	/*
+	 * See if this tevent_context was already registered by
+	 * searching the glue object list. If so we have nothing
+	 * to do here - we already have a tevent_context/tevent_threaded_context
+	 * pair.
+	 */
+	for (glue = pool->glue_list; glue != NULL; glue = glue->next) {
+		if (glue->ev == ev) {
+			return 0;
+		}
+	}
+
+	/*
+	 * Event context not yet registered - create a new glue
+	 * object containing a tevent_context/tevent_threaded_context
+	 * pair and put it on the list to remember this registration.
+	 * We also need a link object to ensure the event context
+	 * can't go away without us knowing about it.
+	 */
+	glue = talloc_zero(pool, struct pthreadpool_tevent_glue);
+	if (glue == NULL) {
+		return ENOMEM;
+	}
+	*glue = (struct pthreadpool_tevent_glue) {
+		.pool = pool,
+		.ev = ev,
+	};
+	talloc_set_destructor(glue, pthreadpool_tevent_glue_destructor);
+
+	/*
+	 * Now allocate the link object to the event context. Note this
+	 * is allocated OFF THE EVENT CONTEXT ITSELF, so if the event
+	 * context is freed we are able to cleanup the glue object
+	 * in the link object destructor.
+	 */
+
+	ev_link = talloc_zero(ev, struct pthreadpool_tevent_glue_ev_link);
+	if (ev_link == NULL) {
+		TALLOC_FREE(glue);
+		return ENOMEM;
+	}
+	ev_link->glue = glue;
+	talloc_set_destructor(ev_link, pthreadpool_tevent_glue_link_destructor);
+
+	glue->ev_link = ev_link;
+
+#ifdef HAVE_PTHREAD
+	glue->tctx = tevent_threaded_context_create(glue, ev);
+	if (glue->tctx == NULL) {
+		TALLOC_FREE(ev_link);
+		TALLOC_FREE(glue);
+		return ENOMEM;
+	}
+#endif
+
+	DLIST_ADD(pool->glue_list, glue);
+	return 0;
+}
+
+static void pthreadpool_tevent_job_fn(void *private_data);
+static void pthreadpool_tevent_job_done(struct tevent_context *ctx,
+					struct tevent_immediate *im,
+					void *private_data);
+
+static int pthreadpool_tevent_job_state_destructor(
+	struct pthreadpool_tevent_job_state *state)
+{
+	if (state->pool == NULL) {
+		return 0;
+	}
+
+	/*
+	 * We should never be called with state->req == NULL,
+	 * state->pool must be cleared before the 2nd talloc_free().
+	 */
+	if (state->req == NULL) {
+		abort();
+	}
+
+	/*
+	 * We need to reparent to a long term context.
+	 */
+	(void)talloc_reparent(state->req, NULL, state);
+	state->req = NULL;
+	return -1;
+}
+
+struct tevent_req *pthreadpool_tevent_job_send(
+	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+	struct pthreadpool_tevent *pool,
+	void (*fn)(void *private_data), void *private_data)
+{
+	struct tevent_req *req;
+	struct pthreadpool_tevent_job_state *state;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct pthreadpool_tevent_job_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->pool = pool;
+	state->ev = ev;
+	state->req = req;
+	state->fn = fn;
+	state->private_data = private_data;
+
+	if (pool == NULL) {
+		tevent_req_error(req, EINVAL);
+		return tevent_req_post(req, ev);
+	}
+	if (pool->pool == NULL) {
+		tevent_req_error(req, EINVAL);
+		return tevent_req_post(req, ev);
+	}
+
+	state->im = tevent_create_immediate(state);
+	if (tevent_req_nomem(state->im, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	ret = pthreadpool_tevent_register_ev(pool, ev);
+	if (tevent_req_error(req, ret)) {
+		return tevent_req_post(req, ev);
+	}
+
+	ret = pthreadpool_add_job(pool->pool, 0,
+				  pthreadpool_tevent_job_fn,
+				  state);
+	if (tevent_req_error(req, ret)) {
+		return tevent_req_post(req, ev);
+	}
+
+	/*
+	 * Once the job is scheduled, we need to protect
+	 * our memory.
+	 */
+	talloc_set_destructor(state, pthreadpool_tevent_job_state_destructor);
+
+	DLIST_ADD_END(pool->jobs, state);
+
+	return req;
+}
+
+static void pthreadpool_tevent_job_fn(void *private_data)
+{
+	struct pthreadpool_tevent_job_state *state = talloc_get_type_abort(
+		private_data, struct pthreadpool_tevent_job_state);
+	state->fn(state->private_data);
+}
+
+static int pthreadpool_tevent_job_signal(int jobid,
+					 void (*job_fn)(void *private_data),
+					 void *job_private_data,
+					 void *private_data)
+{
+	struct pthreadpool_tevent_job_state *state = talloc_get_type_abort(
+		job_private_data, struct pthreadpool_tevent_job_state);
+	struct tevent_threaded_context *tctx = NULL;
+	struct pthreadpool_tevent_glue *g = NULL;
+
+	if (state->pool == NULL) {
+		/* The pthreadpool_tevent is already gone */
+		return 0;
+	}
+
+#ifdef HAVE_PTHREAD
+	for (g = state->pool->glue_list; g != NULL; g = g->next) {
+		if (g->ev == state->ev) {
+			tctx = g->tctx;
+			break;
+		}
+	}
+
+	if (tctx == NULL) {
+		abort();
+	}
+#endif
+
+	if (tctx != NULL) {
+		/* with HAVE_PTHREAD */
+		tevent_threaded_schedule_immediate(tctx, state->im,
+						   pthreadpool_tevent_job_done,
+						   state);
+	} else {
+		/* without HAVE_PTHREAD */
+		tevent_schedule_immediate(state->im, state->ev,
+					  pthreadpool_tevent_job_done,
+					  state);
+	}
+
+	return 0;
+}
+
+static void pthreadpool_tevent_job_done(struct tevent_context *ctx,
+					struct tevent_immediate *im,
+					void *private_data)
+{
+	struct pthreadpool_tevent_job_state *state = talloc_get_type_abort(
+		private_data, struct pthreadpool_tevent_job_state);
+
+	if (state->pool != NULL) {
+		DLIST_REMOVE(state->pool->jobs, state);
+		state->pool = NULL;
+	}
+
+	if (state->req == NULL) {
+		/*
+		 * There was a talloc_free() state->req
+		 * while the job was pending,
+		 * which mean we're reparented on a longterm
+		 * talloc context.
+		 *
+		 * We just cleanup here...
+		 */
+		talloc_free(state);
+		return;
+	}
+
+	tevent_req_done(state->req);
+}
+
+int pthreadpool_tevent_job_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_unix(req);
+}
diff --git a/lib/pthreadpool/pthreadpool_tevent.h b/lib/pthreadpool/pthreadpool_tevent.h
new file mode 100644
index 0000000..10d3a71
--- /dev/null
+++ b/lib/pthreadpool/pthreadpool_tevent.h
@@ -0,0 +1,40 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * threadpool implementation based on pthreads
+ * Copyright (C) Volker Lendecke 2016
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PTHREADPOOL_TEVENT_H__
+#define __PTHREADPOOL_TEVENT_H__
+
+#include <tevent.h>
+
+struct pthreadpool_tevent;
+
+int pthreadpool_tevent_init(TALLOC_CTX *mem_ctx, unsigned max_threads,
+			    struct pthreadpool_tevent **presult);
+
+size_t pthreadpool_tevent_max_threads(struct pthreadpool_tevent *pool);
+size_t pthreadpool_tevent_queued_jobs(struct pthreadpool_tevent *pool);
+
+struct tevent_req *pthreadpool_tevent_job_send(
+	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+	struct pthreadpool_tevent *pool,
+	void (*fn)(void *private_data), void *private_data);
+
+int pthreadpool_tevent_job_recv(struct tevent_req *req);
+
+#endif
diff --git a/lib/pthreadpool/tests.c b/lib/pthreadpool/tests.c
new file mode 100644
index 0000000..08cb59e
--- /dev/null
+++ b/lib/pthreadpool/tests.c
@@ -0,0 +1,517 @@
+#include <stdio.h>
+#include <string.h>
+#include <poll.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include "pthreadpool_pipe.h"
+#include "pthreadpool_tevent.h"
+
+static int test_init(void)
+{
+	struct pthreadpool_pipe *p;
+	int ret;
+
+	ret = pthreadpool_pipe_init(1, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	ret = pthreadpool_pipe_destroy(p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_destroy failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	return 0;
+}
+
+static void test_sleep(void *ptr)
+{
+	int *ptimeout = (int *)ptr;
+	int ret;
+	ret = poll(NULL, 0, *ptimeout);
+	if (ret != 0) {
+		fprintf(stderr, "poll returned %d (%s)\n",
+			ret, strerror(errno));
+	}
+}
+
+static int test_jobs(int num_threads, int num_jobs)
+{
+	char *finished;
+	struct pthreadpool_pipe *p;
+	int timeout = 1;
+	int i, ret;
+
+	finished = (char *)calloc(1, num_jobs);
+	if (finished == NULL) {
+		fprintf(stderr, "calloc failed\n");
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_init(num_threads, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		free(finished);
+		return -1;
+	}
+
+	for (i=0; i<num_jobs; i++) {
+		ret = pthreadpool_pipe_add_job(p, i, test_sleep, &timeout);
+		if (ret != 0) {
+			fprintf(stderr, "pthreadpool_pipe_add_job failed: "
+				"%s\n", strerror(ret));
+			free(finished);
+			return -1;
+		}
+	}
+
+	for (i=0; i<num_jobs; i++) {
+		int jobid = -1;
+		ret = pthreadpool_pipe_finished_jobs(p, &jobid, 1);
+		if (ret < 0) {
+			fprintf(stderr, "pthreadpool_pipe_finished_jobs "
+				"failed: %s\n", strerror(-ret));
+			free(finished);
+			return -1;
+		}
+		if ((ret != 1) || (jobid >= num_jobs)) {
+			fprintf(stderr, "invalid job number %d\n", jobid);
+			free(finished);
+			return -1;
+		}
+		finished[jobid] += 1;
+	}
+
+	for (i=0; i<num_jobs; i++) {
+		if (finished[i] != 1) {
+			fprintf(stderr, "finished[%d] = %d\n",
+				i, finished[i]);
+			free(finished);
+			return -1;
+		}
+	}
+
+	ret = pthreadpool_pipe_destroy(p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_destroy failed: %s\n",
+			strerror(ret));
+		free(finished);
+		return -1;
+	}
+
+	free(finished);
+	return 0;
+}
+
+static int test_busydestroy(void)
+{
+	struct pthreadpool_pipe *p;
+	int timeout = 50;
+	struct pollfd pfd;
+	int ret, jobid;
+
+	ret = pthreadpool_pipe_init(1, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	ret = pthreadpool_pipe_add_job(p, 1, test_sleep, &timeout);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_add_job failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	ret = pthreadpool_pipe_destroy(p);
+	if (ret != EBUSY) {
+		fprintf(stderr, "Could destroy a busy pool\n");
+		return -1;
+	}
+
+	pfd.fd = pthreadpool_pipe_signal_fd(p);
+	pfd.events = POLLIN|POLLERR;
+
+	do {
+		ret = poll(&pfd, 1, -1);
+	} while ((ret == -1) && (errno == EINTR));
+
+	ret = pthreadpool_pipe_finished_jobs(p, &jobid, 1);
+	if (ret < 0) {
+		fprintf(stderr, "pthreadpool_pipe_finished_jobs failed: %s\n",
+			strerror(-ret));
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_destroy(p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_destroy failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	return 0;
+}
+
+static int test_fork(void)
+{
+	struct pthreadpool_pipe *p;
+	pid_t child, waited;
+	int status, ret;
+
+	ret = pthreadpool_pipe_init(1, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+	ret = pthreadpool_pipe_destroy(p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_destroy failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork failed");
+		return -1;
+	}
+	if (child == 0) {
+		exit(0);
+	}
+	waited = wait(&status);
+	if (waited == -1) {
+		perror("wait failed");
+		return -1;
+	}
+	if (waited != child) {
+		fprintf(stderr, "expected child %d, got %d\n",
+			(int)child, (int)waited);
+		return -1;
+	}
+	return 0;
+}
+
+static void busyfork_job(void *private_data)
+{
+	return;
+}
+
+static int test_busyfork(void)
+{
+	struct pthreadpool_pipe *p;
+	int fds[2];
+	struct pollfd pfd;
+	pid_t child, waitret;
+	int ret, jobnum, wstatus;
+
+	ret = pipe(fds);
+	if (ret == -1) {
+		perror("pipe failed");
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_init(1, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_add_job(p, 1, busyfork_job, NULL);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_add_job failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_finished_jobs(p, &jobnum, 1);
+	if (ret != 1) {
+		fprintf(stderr, "pthreadpool_pipe_finished_jobs failed\n");
+		return -1;
+	}
+
+	ret = poll(NULL, 0, 200);
+	if (ret == -1) {
+		perror("poll failed");
+		return -1;
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork failed");
+		return -1;
+	}
+
+	if (child == 0) {
+		ret = pthreadpool_pipe_destroy(p);
+		if (ret != 0) {
+			fprintf(stderr, "pthreadpool_pipe_destroy failed: "
+				"%s\n", strerror(ret));
+			exit(1);
+		}
+		exit(0);
+	}
+
+	ret = close(fds[1]);
+	if (ret == -1) {
+		perror("close failed");
+		return -1;
+	}
+
+	pfd = (struct pollfd) { .fd = fds[0], .events = POLLIN };
+
+	ret = poll(&pfd, 1, 5000);
+	if (ret == -1) {
+		perror("poll failed");
+		return -1;
+	}
+	if (ret == 0) {
+		fprintf(stderr, "Child did not exit for 5 seconds\n");
+		/*
+		 * The child might hang forever in
+		 * pthread_cond_destroy for example. Be kind to the
+		 * system and kill it.
+		 */
+		kill(child, SIGTERM);
+		return -1;
+	}
+	if (ret != 1) {
+		fprintf(stderr, "poll returned %d -- huh??\n", ret);
+		return -1;
+	}
+
+	ret = poll(NULL, 0, 200);
+	if (ret == -1) {
+		perror("poll failed");
+		return -1;
+	}
+
+	waitret = waitpid(child, &wstatus, WNOHANG);
+	if (waitret != child) {
+		fprintf(stderr, "waitpid returned %d\n", (int)waitret);
+		return -1;
+	}
+
+	if (!WIFEXITED(wstatus)) {
+		fprintf(stderr, "child did not properly exit\n");
+		return -1;
+	}
+
+	ret = WEXITSTATUS(wstatus);
+	if (ret != 0) {
+		fprintf(stderr, "child returned %d\n", ret);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int test_busyfork2(void)
+{
+	struct pthreadpool_pipe *p;
+	pid_t child;
+	int ret, jobnum;
+	struct pollfd pfd;
+
+	ret = pthreadpool_pipe_init(1, &p);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_pipe_init failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_add_job(p, 1, busyfork_job, NULL);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_add_job failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_finished_jobs(p, &jobnum, 1);
+	if (ret != 1) {
+		fprintf(stderr, "pthreadpool_pipe_finished_jobs failed\n");
+		return -1;
+	}
+
+	ret = poll(NULL, 0, 10);
+	if (ret == -1) {
+		perror("poll failed");
+		return -1;
+	}
+
+	ret = pthreadpool_pipe_add_job(p, 1, busyfork_job, NULL);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_add_job failed: %s\n",
+			strerror(ret));
+		return -1;
+	}
+
+	/*
+	 * Do the fork right after the add_job. This tests a race
+	 * where the atfork prepare handler gets all idle threads off
+	 * the condvar. If we are faster doing the fork than the
+	 * existing idle thread could get out of idle and take the
+	 * job, after the fork we end up with no threads to take care
+	 * of the job.
+	 */
+
+	child = fork();
+	if (child < 0) {
+		perror("fork failed");
+		return -1;
+	}
+
+	if (child == 0) {
+		exit(0);
+	}
+
+	pfd = (struct pollfd) {
+		.fd = pthreadpool_pipe_signal_fd(p),
+		.events = POLLIN|POLLERR
+	};
+
+	do {
+		ret = poll(&pfd, 1, 5000);
+	} while ((ret == -1) && (errno == EINTR));
+
+	if (ret == 0) {
+		fprintf(stderr, "job unfinished after 5 seconds\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void test_tevent_wait(void *private_data)
+{
+	int *timeout = private_data;
+	poll(NULL, 0, *timeout);
+}
+
+static int test_tevent_1(void)
+{
+	struct tevent_context *ev;
+	struct pthreadpool_tevent *pool;
+	struct tevent_req *req1, *req2;
+	int timeout10 = 10;
+	int timeout100 = 100;
+	int ret;
+	bool ok;
+
+	ev = tevent_context_init(NULL);
+	if (ev == NULL) {
+		ret = errno;
+		fprintf(stderr, "tevent_context_init failed: %s\n",
+			strerror(ret));
+		return ret;
+	}
+	ret = pthreadpool_tevent_init(ev, UINT_MAX, &pool);
+	if (ret != 0) {
+		fprintf(stderr, "pthreadpool_tevent_init failed: %s\n",
+			strerror(ret));
+		TALLOC_FREE(ev);
+		return ret;
+	}
+	req1 = pthreadpool_tevent_job_send(
+		ev, ev, pool, test_tevent_wait, &timeout10);
+	if (req1 == NULL) {
+		fprintf(stderr, "pthreadpool_tevent_job_send failed\n");
+		TALLOC_FREE(ev);
+		return ENOMEM;
+	}
+	req2 = pthreadpool_tevent_job_send(
+		ev, ev, pool, test_tevent_wait, &timeout100);
+	if (req2 == NULL) {
+		fprintf(stderr, "pthreadpool_tevent_job_send failed\n");
+		TALLOC_FREE(ev);
+		return ENOMEM;
+	}
+	ok = tevent_req_poll(req2, ev);
+	if (!ok) {
+		ret = errno;
+		fprintf(stderr, "tevent_req_poll failed: %s\n",
+			strerror(ret));
+		TALLOC_FREE(ev);
+		return ret;
+	}
+	ret = pthreadpool_tevent_job_recv(req1);
+	TALLOC_FREE(req1);
+	if (ret != 0) {
+		fprintf(stderr, "tevent_req_poll failed: %s\n",
+			strerror(ret));
+		TALLOC_FREE(ev);
+		return ret;
+	}
+
+	TALLOC_FREE(req2);
+
+	ret = tevent_loop_wait(ev);
+	if (ret != 0) {
+		fprintf(stderr, "tevent_loop_wait failed\n");
+		return ret;
+	}
+
+	TALLOC_FREE(pool);
+	TALLOC_FREE(ev);
+	return 0;
+}
+
+int main(void)
+{
+	int ret;
+
+	ret = test_tevent_1();
+	if (ret != 0) {
+		fprintf(stderr, "test_event_1 failed: %s\n",
+			strerror(ret));
+		return 1;
+	}
+
+	ret = test_init();
+	if (ret != 0) {
+		fprintf(stderr, "test_init failed\n");
+		return 1;
+	}
+
+	ret = test_fork();
+	if (ret != 0) {
+		fprintf(stderr, "test_fork failed\n");
+		return 1;
+	}
+
+	ret = test_jobs(10, 10000);
+	if (ret != 0) {
+		fprintf(stderr, "test_jobs failed\n");
+		return 1;
+	}
+
+	ret = test_busydestroy();
+	if (ret != 0) {
+		fprintf(stderr, "test_busydestroy failed\n");
+		return 1;
+	}
+
+	ret = test_busyfork();
+	if (ret != 0) {
+		fprintf(stderr, "test_busyfork failed\n");
+		return 1;
+	}
+
+	ret = test_busyfork2();
+	if (ret != 0) {
+		fprintf(stderr, "test_busyfork2 failed\n");
+		return 1;
+	}
+
+	printf("success\n");
+	return 0;
+}
diff --git a/lib/pthreadpool/tests_cmocka.c b/lib/pthreadpool/tests_cmocka.c
new file mode 100644
index 0000000..e6af884
--- /dev/null
+++ b/lib/pthreadpool/tests_cmocka.c
@@ -0,0 +1,247 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * cmocka tests for thread pool implementation
+ * Copyright (C) Christof Schmitt 2017
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <pthread.h>
+#include <setjmp.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include <talloc.h>
+#include <tevent.h>
+#include <pthreadpool_tevent.h>
+
+#include <cmocka.h>
+#include <poll.h>
+
+struct pthreadpool_tevent_test {
+	struct tevent_context *ev;
+	struct pthreadpool_tevent *upool;
+	struct pthreadpool_tevent *spool;
+	struct pthreadpool_tevent *opool;
+};
+
+static int setup_pthreadpool_tevent(void **state)
+{
+	struct pthreadpool_tevent_test *t;
+	int ret;
+	size_t max_threads;
+
+	t = talloc_zero(NULL, struct pthreadpool_tevent_test);
+	assert_non_null(t);
+
+	t->ev = tevent_context_init(t);
+	assert_non_null(t->ev);
+
+	ret = pthreadpool_tevent_init(t->ev, UINT_MAX, &t->upool);
+	assert_int_equal(ret, 0);
+
+	max_threads = pthreadpool_tevent_max_threads(t->upool);
+	assert_int_equal(max_threads, UINT_MAX);
+
+	ret = pthreadpool_tevent_init(t->ev, 1, &t->opool);
+	assert_int_equal(ret, 0);
+
+	max_threads = pthreadpool_tevent_max_threads(t->opool);
+	assert_int_equal(max_threads, 1);
+
+	ret = pthreadpool_tevent_init(t->ev, 0, &t->spool);
+	assert_int_equal(ret, 0);
+
+	max_threads = pthreadpool_tevent_max_threads(t->spool);
+	assert_int_equal(max_threads, 0);
+
+	*state = t;
+
+	return 0;
+}
+
+static int teardown_pthreadpool_tevent(void **state)
+{
+	struct pthreadpool_tevent_test *t = *state;
+
+	TALLOC_FREE(t);
+
+	return 0;
+}
+
+int __wrap_pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+			  void *(*start_routine) (void *), void *arg);
+int __real_pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+			  void *(*start_routine) (void *),  void *arg);
+
+int __wrap_pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+			  void *(*start_routine) (void *), void *arg)
+{
+	int error;
+
+	error = mock_type(int);
+	if (error != 0) {
+		return error;
+	}
+
+	return __real_pthread_create(thread, attr, start_routine, arg);
+}
+
+static void test_job_threadid(void *ptr)
+{
+	pthread_t *threadid = ptr;
+
+	*threadid = pthread_self();
+}
+
+static int test_create_do(struct tevent_context *ev,
+			  struct pthreadpool_tevent *pool,
+			  bool *executed,
+			  bool *in_main_thread)
+{
+	struct tevent_req *req;
+	pthread_t zero_thread;
+	pthread_t main_thread;
+	pthread_t worker_thread;
+	bool ok;
+	int ret;
+
+	*executed = false;
+	*in_main_thread = false;
+
+	memset(&zero_thread, 0, sizeof(zero_thread));
+	main_thread = pthread_self();
+	worker_thread = zero_thread;
+
+	req = pthreadpool_tevent_job_send(
+		ev, ev, pool, test_job_threadid, &worker_thread);
+	if (req == NULL) {
+		fprintf(stderr, "pthreadpool_tevent_job_send failed\n");
+		return ENOMEM;
+	}
+
+	ok = tevent_req_poll(req, ev);
+	if (!ok) {
+		ret = errno;
+		fprintf(stderr, "tevent_req_poll failed: %s\n",
+			strerror(ret));
+		*executed = !pthread_equal(worker_thread, zero_thread);
+		*in_main_thread = pthread_equal(worker_thread, main_thread);
+		return ret;
+	}
+
+
+	ret = pthreadpool_tevent_job_recv(req);
+	TALLOC_FREE(req);
+	*executed = !pthread_equal(worker_thread, zero_thread);
+	*in_main_thread = pthread_equal(worker_thread, main_thread);
+	if (ret != 0) {
+		fprintf(stderr, "tevent_req_recv failed: %s\n",
+			strerror(ret));
+		return ret;
+	}
+
+	return 0;
+}
+
+static void test_create(void **state)
+{
+	struct pthreadpool_tevent_test *t = *state;
+	bool executed;
+	bool in_main_thread;
+	int ret;
+
+	/*
+	 * When pthreadpool cannot create the first worker thread,
+	 * this job will run in the sync fallback in the main thread.
+	 */
+	will_return(__wrap_pthread_create, EAGAIN);
+	ret = test_create_do(t->ev, t->upool, &executed, &in_main_thread);
+	assert_int_equal(ret, EAGAIN);
+	assert_false(executed);
+	assert_false(in_main_thread);
+
+	/*
+	 * The sync pool won't trigger pthread_create()
+	 * It will be triggered by the one pool.
+	 */
+	will_return(__wrap_pthread_create, EAGAIN);
+
+	ret = test_create_do(t->ev, t->spool, &executed, &in_main_thread);
+	assert_int_equal(ret, 0);
+	assert_true(executed);
+	assert_true(in_main_thread);
+
+	ret = test_create_do(t->ev, t->opool, &executed, &in_main_thread);
+	assert_int_equal(ret, EAGAIN);
+	assert_false(executed);
+	assert_false(in_main_thread);
+
+	/*
+	 * When a thread can be created, the job will run in the worker thread.
+	 */
+	will_return(__wrap_pthread_create, 0);
+	ret = test_create_do(t->ev, t->upool, &executed, &in_main_thread);
+	assert_int_equal(ret, 0);
+	assert_true(executed);
+	assert_false(in_main_thread);
+
+	poll(NULL, 0, 10);
+
+	/*
+	 * Workerthread will still be active for a second; immediately
+	 * running another job will also use the worker thread, even
+	 * if a new thread cannot be created.
+	 */
+	ret = test_create_do(t->ev, t->upool, &executed, &in_main_thread);
+	assert_int_equal(ret, 0);
+	assert_true(executed);
+	assert_false(in_main_thread);
+
+	/*
+	 * When a thread can be created, the job will run in the worker thread.
+	 */
+	will_return(__wrap_pthread_create, 0);
+	ret = test_create_do(t->ev, t->opool, &executed, &in_main_thread);
+	assert_int_equal(ret, 0);
+	assert_true(executed);
+	assert_false(in_main_thread);
+
+	poll(NULL, 0, 10);
+
+	/*
+	 * Workerthread will still be active for a second; immediately
+	 * running another job will also use the worker thread, even
+	 * if a new thread cannot be created.
+	 */
+	ret = test_create_do(t->ev, t->opool, &executed, &in_main_thread);
+	assert_int_equal(ret, 0);
+	assert_true(executed);
+	assert_false(in_main_thread);
+}
+
+int main(int argc, char **argv)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test_setup_teardown(test_create,
+						setup_pthreadpool_tevent,
+						teardown_pthreadpool_tevent),
+	};
+
+	cmocka_set_message_output(CM_OUTPUT_SUBUNIT);
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/lib/pthreadpool/wscript_build b/lib/pthreadpool/wscript_build
new file mode 100644
index 0000000..e270f90
--- /dev/null
+++ b/lib/pthreadpool/wscript_build
@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+if bld.env.WITH_PTHREADPOOL:
+    extra_libs=''
+
+    # Link to librt if needed for clock_gettime()
+    if bld.CONFIG_SET('HAVE_LIBRT'): extra_libs += ' rt'
+
+    bld.SAMBA_SUBSYSTEM('PTHREADPOOL',
+                         source='''pthreadpool.c
+                                   pthreadpool_pipe.c
+                                   pthreadpool_tevent.c
+                                ''',
+                         deps='pthread replace tevent-util' + extra_libs)
+else:
+    bld.SAMBA_SUBSYSTEM('PTHREADPOOL',
+                         source='''pthreadpool_sync.c
+                                   pthreadpool_pipe.c
+                                   pthreadpool_tevent.c
+                                ''',
+                         deps='replace tevent-util')
+
+
+bld.SAMBA_BINARY('pthreadpooltest',
+                  source='tests.c',
+                  deps='PTHREADPOOL',
+                  enabled=bld.env.WITH_PTHREADPOOL,
+                  for_selftest=True)
+
+bld.SAMBA_BINARY('pthreadpooltest_cmocka',
+                  source='tests_cmocka.c',
+                  deps='PTHREADPOOL cmocka',
+                  ldflags='-Wl,--wrap=pthread_create',
+                  enabled=bld.env.WITH_PTHREADPOOL and bld.env['HAVE_LDWRAP'],
+                  for_selftest=True)