+/*
+ Bacula(R) - The Network Backup Solution
+
+ Copyright (C) 2000-2016 Kern Sibbald
+
+ The original author of Bacula is Kern Sibbald, with contributions
+ from many others, a complete list can be found in the file AUTHORS.
+
+ You may use this file and others of this release according to the
+ license defined in the LICENSE file, which includes the Affero General
+ Public License, v3.0 ("AGPLv3") and some additional permissions and
+ terms pursuant to its AGPLv3 Section 7.
+
+ This notice must be preserved when any source code is
+ conveyed and/or propagated.
+
+ Bacula(R) is a registered trademark of Kern Sibbald.
+*/
/*
* Bacula Thread Read/Write locking code. It permits
* multiple readers but only one writer. Note, however,
*
* Kern Sibbald, January MMI
*
- * Version $Id$
- *
* This code adapted from "Programming with POSIX Threads", by
* David R. Butenhof
*
*/
-/*
- Copyright (C) 2000-2004 Kern Sibbald and John Walker
-
- 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 2 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, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA.
-
- */
+#define LOCKMGR_COMPLIANT
#include "bacula.h"
/*
* Returns: 0 on success
* errno on failure
*/
-int rwl_init(brwlock_t *rwl)
+int rwl_init(brwlock_t *rwl, int priority)
{
int stat;
rwl->r_active = rwl->w_active = 0;
rwl->r_wait = rwl->w_wait = 0;
+ rwl->priority = priority;
if ((stat = pthread_mutex_init(&rwl->mutex, NULL)) != 0) {
return stat;
}
* Lock for write access, wait until locked (or error).
* Multiple nested write locking is permitted.
*/
-int rwl_writelock(brwlock_t *rwl)
+int rwl_writelock_p(brwlock_t *rwl, const char *file, int line)
{
int stat;
pthread_mutex_unlock(&rwl->mutex);
return 0;
}
+ lmgr_pre_lock(rwl, rwl->priority, file, line);
if (rwl->w_active || rwl->r_active > 0) {
rwl->w_wait++; /* indicate that we are waiting */
pthread_cleanup_push(rwl_write_release, (void *)rwl);
while (rwl->w_active || rwl->r_active > 0) {
if ((stat = pthread_cond_wait(&rwl->write, &rwl->mutex)) != 0) {
+ lmgr_do_unlock(rwl);
break; /* error, bail out */
}
}
if (stat == 0) {
rwl->w_active++; /* we are running */
rwl->writer_id = pthread_self(); /* save writer thread's id */
+ lmgr_post_lock();
}
pthread_mutex_unlock(&rwl->mutex);
return stat;
} else {
rwl->w_active = 1; /* we are running */
rwl->writer_id = pthread_self(); /* save writer thread's id */
+ lmgr_do_lock(rwl, rwl->priority, __FILE__, __LINE__);
}
stat2 = pthread_mutex_unlock(&rwl->mutex);
return (stat == 0 ? stat2 : stat);
return stat;
}
if (rwl->w_active <= 0) {
- Emsg0(M_ABORT, 0, "rwl_writeunlock called too many times.\n");
+ pthread_mutex_unlock(&rwl->mutex);
+ Jmsg0(NULL, M_ABORT, 0, _("rwl_writeunlock called too many times.\n"));
}
rwl->w_active--;
if (!pthread_equal(pthread_self(), rwl->writer_id)) {
- Emsg0(M_ABORT, 0, "rwl_writeunlock by non-owner.\n");
+ pthread_mutex_unlock(&rwl->mutex);
+ Jmsg0(NULL, M_ABORT, 0, _("rwl_writeunlock by non-owner.\n"));
}
if (rwl->w_active > 0) {
stat = 0; /* writers still active */
} else {
+ lmgr_do_unlock(rwl);
/* No more writers, awaken someone */
if (rwl->r_wait > 0) { /* if readers waiting */
stat = pthread_cond_broadcast(&rwl->read);
return (stat == 0 ? stat2 : stat);
}
+bool is_rwl_valid(brwlock_t *rwl)
+{
+ return (rwl->valid == RWLOCK_VALID);
+}
+
+
#ifdef TEST_RWLOCK
-#define THREADS 5
+#define THREADS 300
#define DATASIZE 15
-#define ITERATIONS 10000
+#define ITERATIONS 1000000
/*
* Keep statics for each thread.
int writes;
} data_t;
-thread_t threads[THREADS];
-data_t data[DATASIZE];
+static thread_t threads[THREADS];
+static data_t data[DATASIZE];
/*
* Thread start routine that uses read/write locks.
* update operation (write lock instead of read
* lock).
*/
- if ((iteration % self->interval) == 0) {
+// if ((iteration % self->interval) == 0) {
status = rwl_writelock(&data[element].lock);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Write lock failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Write lock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
data[element].data = self->thread_num;
data[element].writes++;
self->writes++;
+ status = rwl_writelock(&data[element].lock);
+ if (status != 0) {
+ berrno be;
+ printf("Write lock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
+ }
+ data[element].data = self->thread_num;
+ data[element].writes++;
+ self->writes++;
+ status = rwl_writeunlock(&data[element].lock);
+ if (status != 0) {
+ berrno be;
+ printf("Write unlock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
+ }
status = rwl_writeunlock(&data[element].lock);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Write unlock failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Write unlock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
+
+#ifdef xxx
} else {
/*
* Look at the current data element to see whether
*/
status = rwl_readlock(&data[element].lock);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Read lock failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Read lock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
self->reads++;
if (data[element].data == self->thread_num)
repeats++;
status = rwl_readunlock(&data[element].lock);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Read unlock failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Read unlock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
}
+#endif
element++;
if (element >= DATASIZE) {
element = 0;
}
}
if (repeats > 0) {
- Pmsg2(000, "Thread %d found unchanged elements %d times\n",
+ Pmsg2(000, _("Thread %d found unchanged elements %d times\n"),
self->thread_num, repeats);
}
return NULL;
int thread_writes = 0;
int data_writes = 0;
-#ifdef sun
/*
- * On Solaris 2.5, threads are not timesliced. To ensure
- * that our threads can run concurrently, we need to
- * increase the concurrency level to THREADS.
+ * For Solaris 2.5,2.6,7 and 8 threads are not timesliced.
+ * Ensure our threads can run concurrently.
*/
- thr_setconcurrency (THREADS);
-#endif
+ thr_setconcurrency(THREADS); /* Only implemented on Solaris */
/*
* Initialize the shared data.
for (data_count = 0; data_count < DATASIZE; data_count++) {
data[data_count].data = 0;
data[data_count].writes = 0;
- status = rwl_init (&data[data_count].lock);
+ status = rwl_init(&data[data_count].lock);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Init rwlock failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Init rwlock failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
}
threads[count].thread_num = count + 1;
threads[count].writes = 0;
threads[count].reads = 0;
- threads[count].interval = rand_r (&seed) % 71;
+ threads[count].interval = rand_r(&seed) % 71;
+ if (threads[count].interval <= 0) {
+ threads[count].interval = 1;
+ }
status = pthread_create (&threads[count].thread_id,
NULL, thread_routine, (void*)&threads[count]);
- if (status != 0) {
- Emsg1(M_ABORT, 0, "Create thread failed. ERR=%s\n", strerror(status));
+ if (status != 0 || (int)threads[count].thread_id == 0) {
+ berrno be;
+ printf("Create thread failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
}
for (count = 0; count < THREADS; count++) {
status = pthread_join (threads[count].thread_id, NULL);
if (status != 0) {
- Emsg1(M_ABORT, 0, "Join thread failed. ERR=%s\n", strerror(status));
+ berrno be;
+ printf("Join thread failed. ERR=%s\n", be.bstrerror(status));
+ exit(1);
}
thread_writes += threads[count].writes;
- printf ("%02d: interval %d, writes %d, reads %d\n",
+ printf (_("%02d: interval %d, writes %d, reads %d\n"),
count, threads[count].interval,
threads[count].writes, threads[count].reads);
}
*/
for (data_count = 0; data_count < DATASIZE; data_count++) {
data_writes += data[data_count].writes;
- printf ("data %02d: value %d, %d writes\n",
+ printf (_("data %02d: value %d, %d writes\n"),
data_count, data[data_count].data, data[data_count].writes);
rwl_destroy (&data[data_count].lock);
}
- printf ("Total: %d thread writes, %d data writes\n",
+ printf (_("Total: %d thread writes, %d data writes\n"),
thread_writes, data_writes);
return 0;
}
*
* Demonstrate use of non-blocking read-write locks.
*
- * Special notes: On a Solaris system, call thr_setconcurrency()
+ * On older Solaris systems, call thr_setconcurrency()
* to allow interleaved thread execution, since threads are not
* timesliced.
*/
int iteration;
int element;
int status;
-
+ lmgr_init_thread();
element = 0; /* Current data element */
for (iteration = 0; iteration < ITERATIONS; iteration++) {
self->updates++;
rwl_writeunlock (&data[element].lock);
} else
- err_abort (status, "Try write lock");
+ err_abort (status, _("Try write lock"));
} else {
status = rwl_readtrylock (&data[element].lock);
if (status == EBUSY)
self->r_collisions++;
else if (status != 0) {
- err_abort (status, "Try read lock");
+ err_abort (status, _("Try read lock"));
} else {
if (data[element].data != data[element].updates)
printf ("%d: data[%d] %d != %d\n",
if (element >= DATASIZE)
element = 0;
}
+ lmgr_cleanup_thread();
return NULL;
}
int thread_updates = 0, data_updates = 0;
int status;
-#ifdef sun
/*
- * On Solaris 2.5, threads are not timesliced. To ensure
- * that our threads can run concurrently, we need to
- * increase the concurrency level to THREADS.
+ * For Solaris 2.5,2.6,7 and 8 threads are not timesliced.
+ * Ensure our threads can run concurrently.
*/
DPRINTF (("Setting concurrency level to %d\n", THREADS));
- thr_setconcurrency (THREADS);
-#endif
+ thr_setconcurrency(THREADS); /* Only implemented on Solaris */
/*
* Initialize the shared data.
for (data_count = 0; data_count < DATASIZE; data_count++) {
data[data_count].data = 0;
data[data_count].updates = 0;
- rwl_init (&data[data_count].lock);
+ rwl_init(&data[data_count].lock);
}
/*
status = pthread_create (&threads[count].thread_id,
NULL, thread_routine, (void*)&threads[count]);
if (status != 0)
- err_abort (status, "Create thread");
+ err_abort (status, _("Create thread"));
}
/*
for (count = 0; count < THREADS; count++) {
status = pthread_join (threads[count].thread_id, NULL);
if (status != 0)
- err_abort (status, "Join thread");
+ err_abort (status, _("Join thread"));
thread_updates += threads[count].updates;
- printf ("%02d: interval %d, updates %d, "
- "r_collisions %d, w_collisions %d\n",
+ printf (_("%02d: interval %d, updates %d, "
+ "r_collisions %d, w_collisions %d\n"),
count, threads[count].interval,
threads[count].updates,
threads[count].r_collisions, threads[count].w_collisions);
*/
for (data_count = 0; data_count < DATASIZE; data_count++) {
data_updates += data[data_count].updates;
- printf ("data %02d: value %d, %d updates\n",
+ printf (_("data %02d: value %d, %d updates\n"),
data_count, data[data_count].data, data[data_count].updates);
rwl_destroy (&data[data_count].lock);
}
projects / bacula / bacula / blobdiff