1 files changed, 202 insertions, 0 deletions
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;
+}