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authorVolker Lendecke <vl@samba.org>2012-06-13 13:05:17 +0200
committerJeremy Allison <jra@samba.org>2012-06-19 10:27:24 -0700
commit8b35a4de3880e1a3f64534db9748d5786a2ccb01 (patch)
treeccf8e28ba87c37a970f878d3fb9e37fff29b43c3 /source3/lib
parent818fd7e917a7e2d6762e7b7f773a34e59c75b0df (diff)
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s3: Add a dummy implementation for the pthreadpool API
Signed-off-by: Jeremy Allison <jra@samba.org>
Diffstat (limited to 'source3/lib')
-rw-r--r--source3/lib/pthreadpool/pthreadpool_sync.c174
-rw-r--r--source3/lib/pthreadpool/wscript_build13
2 files changed, 183 insertions, 4 deletions
diff --git a/source3/lib/pthreadpool/pthreadpool_sync.c b/source3/lib/pthreadpool/pthreadpool_sync.c
new file mode 100644
index 0000000000..6c18b8f8d8
--- /dev/null
+++ b/source3/lib/pthreadpool/pthreadpool_sync.c
@@ -0,0 +1,174 @@
+/*
+ * 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 <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <signal.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <sys/time.h>
+
+#include "pthreadpool.h"
+
+struct pthreadpool {
+ /*
+ * pipe for signalling
+ */
+ int sig_pipe[2];
+
+ /*
+ * Have we sent something into the pipe that has not been
+ * retrieved yet?
+ */
+ int pipe_busy;
+
+ /*
+ * Jobids that we have not sent into the pipe yet
+ */
+ size_t num_ids;
+ int *ids;
+};
+
+int pthreadpool_init(unsigned max_threads, struct pthreadpool **presult)
+{
+ struct pthreadpool *pool;
+ int ret;
+
+ pool = (struct pthreadpool *)calloc(1, sizeof(struct pthreadpool));
+ if (pool == NULL) {
+ return ENOMEM;
+ }
+ ret = pipe(pool->sig_pipe);
+ if (ret == -1) {
+ int err = errno;
+ free(pool);
+ return err;
+ }
+ *presult = pool;
+ return 0;
+}
+
+int pthreadpool_signal_fd(struct pthreadpool *pool)
+{
+ return pool->sig_pipe[0];
+}
+
+static int pthreadpool_write_to_pipe(struct pthreadpool *pool)
+{
+ ssize_t written;
+
+ if (pool->pipe_busy) {
+ return 0;
+ }
+ if (pool->num_ids == 0) {
+ return 0;
+ }
+
+ written = -1;
+ errno = EINTR;
+
+ while ((written == -1) && (errno == EINTR)) {
+ written = write(pool->sig_pipe[1], &pool->ids[0], sizeof(int));
+ }
+ if (written == -1) {
+ return errno;
+ }
+ if (written != sizeof(int)) {
+ /*
+ * If a single int only partially fits into the pipe,
+ * we can assume ourselves pretty broken
+ */
+ close(pool->sig_pipe[1]);
+ pool->sig_pipe[1] = -1;
+ return EIO;
+ }
+
+ if (pool->num_ids > 1) {
+ memmove(pool->ids, pool->ids+1, sizeof(int) * (pool->num_ids-1));
+ }
+ pool->num_ids -= 1;
+ pool->pipe_busy = 1;
+ return 0;
+}
+
+int pthreadpool_add_job(struct pthreadpool *pool, int job_id,
+ void (*fn)(void *private_data), void *private_data)
+{
+ int *tmp;
+
+ if (pool->sig_pipe[1] == -1) {
+ return EIO;
+ }
+
+ fn(private_data);
+
+ tmp = realloc(pool->ids, sizeof(int) * (pool->num_ids+1));
+ if (tmp == NULL) {
+ return ENOMEM;
+ }
+ pool->ids = tmp;
+ pool->ids[pool->num_ids] = job_id;
+ pool->num_ids += 1;
+
+ return pthreadpool_write_to_pipe(pool);
+
+}
+
+int pthreadpool_finished_job(struct pthreadpool *pool, int *jobid)
+{
+ int ret_jobid;
+ ssize_t nread;
+
+ nread = -1;
+ errno = EINTR;
+
+ while ((nread == -1) && (errno == EINTR)) {
+ nread = read(pool->sig_pipe[0], &ret_jobid, sizeof(int));
+ }
+ if (nread == -1) {
+ return errno;
+ }
+ if (nread != sizeof(int)) {
+ return EINVAL;
+ }
+ *jobid = ret_jobid;
+
+ pool->pipe_busy = 0;
+ return pthreadpool_write_to_pipe(pool);
+}
+
+int pthreadpool_destroy(struct pthreadpool *pool)
+{
+ if (pool->sig_pipe[0] != -1) {
+ close(pool->sig_pipe[0]);
+ pool->sig_pipe[0] = -1;
+ }
+
+ if (pool->sig_pipe[1] != -1) {
+ close(pool->sig_pipe[1]);
+ pool->sig_pipe[1] = -1;
+ }
+ free(pool->ids);
+ free(pool);
+ return 0;
+}
diff --git a/source3/lib/pthreadpool/wscript_build b/source3/lib/pthreadpool/wscript_build
index 5488c3a5ea..2cdd2ab312 100644
--- a/source3/lib/pthreadpool/wscript_build
+++ b/source3/lib/pthreadpool/wscript_build
@@ -1,9 +1,14 @@
#!/usr/bin/env python
-bld.SAMBA3_SUBSYSTEM('PTHREADPOOL',
- source='pthreadpool.c',
- deps='pthread rt replace',
- enabled=bld.env.WITH_PTHREADPOOL)
+if bld.env.WITH_PTHREADPOOL:
+ bld.SAMBA3_SUBSYSTEM('PTHREADPOOL',
+ source='pthreadpool.c',
+ deps='pthread rt replace')
+else:
+ bld.SAMBA3_SUBSYSTEM('PTHREADPOOL',
+ source='pthreadpool_sync.c',
+ deps='replace')
+
bld.SAMBA3_BINARY('pthreadpooltest',
source='tests.c',