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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
commit4f5791ebd03eaec1c7da0865a383175b05102712 (patch)
tree8ce7b00f7a76baa386372422adebbe64510812d4 /lib/pthreadpool/pthreadpool_pipe.c
parentInitial commit. (diff)
downloadsamba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz
samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/pthreadpool/pthreadpool_pipe.c')
-rw-r--r--lib/pthreadpool/pthreadpool_pipe.c202
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;
+}