libvirt/src/util/threads-pthread.c
Eric Blake 336fd879c0 util: ensure virMutexInit is not recursive
POSIX states that creation of a mutex with default attributes
is unspecified whether the mutex is recursive or non-recursive.
We specifically want non-recursive (deadlock is desirable in
flushing out coding bugs that used our mutex incorrectly).

* src/util/threads-pthread.c (virMutexInit): Specifically request
non-recursive mutex, rather than relying on unspecified default.
2010-03-18 21:37:32 +01:00

140 lines
2.9 KiB
C

/*
* threads-pthread.c: basic thread synchronization primitives
*
* Copyright (C) 2009-2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <config.h>
/* Nothing special required for pthreads */
int virThreadInitialize(void)
{
return 0;
}
void virThreadOnExit(void)
{
}
int virMutexInit(virMutexPtr m)
{
int ret;
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
if ((ret = pthread_mutex_init(&m->lock, &attr)) != 0) {
errno = ret;
return -1;
}
return 0;
}
void virMutexDestroy(virMutexPtr m)
{
pthread_mutex_destroy(&m->lock);
}
void virMutexLock(virMutexPtr m){
pthread_mutex_lock(&m->lock);
}
void virMutexUnlock(virMutexPtr m)
{
pthread_mutex_unlock(&m->lock);
}
int virCondInit(virCondPtr c)
{
int ret;
if ((ret = pthread_cond_init(&c->cond, NULL)) != 0) {
errno = ret;
return -1;
}
return 0;
}
int virCondDestroy(virCondPtr c)
{
int ret;
if ((ret = pthread_cond_destroy(&c->cond)) != 0) {
errno = ret;
return -1;
}
return 0;
}
int virCondWait(virCondPtr c, virMutexPtr m)
{
int ret;
if ((ret = pthread_cond_wait(&c->cond, &m->lock)) != 0) {
errno = ret;
return -1;
}
return 0;
}
int virCondWaitUntil(virCondPtr c, virMutexPtr m, unsigned long long whenms)
{
int ret;
struct timespec ts;
ts.tv_sec = whenms / 1000;
ts.tv_nsec = (whenms % 1000) * 1000;
if ((ret = pthread_cond_timedwait(&c->cond, &m->lock, &ts)) != 0) {
errno = ret;
return -1;
}
return 0;
}
void virCondSignal(virCondPtr c)
{
pthread_cond_signal(&c->cond);
}
void virCondBroadcast(virCondPtr c)
{
pthread_cond_broadcast(&c->cond);
}
int virThreadLocalInit(virThreadLocalPtr l,
virThreadLocalCleanup c)
{
int ret;
if ((ret = pthread_key_create(&l->key, c)) != 0) {
errno = ret;
return -1;
}
return 0;
}
void *virThreadLocalGet(virThreadLocalPtr l)
{
return pthread_getspecific(l->key);
}
void virThreadLocalSet(virThreadLocalPtr l, void *val)
{
pthread_setspecific(l->key, val);
}