tor-android/external/badvpn_dns/system/BLockReactor.c

132 lines
3.6 KiB
C

/**
* @file BLockReactor.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <misc/debug.h>
#include <misc/offset.h>
#include <base/BLog.h>
#include "BLockReactor.h"
#include <generated/blog_channel_BLockReactor.h>
static void thread_signal_handler (BThreadSignal *thread_signal)
{
BLockReactor *o = UPPER_OBJECT(thread_signal, BLockReactor, thread_signal);
DebugObject_Access(&o->d_obj);
ASSERT_FORCE(sem_post(&o->sem1) == 0)
ASSERT_FORCE(sem_wait(&o->sem2) == 0)
}
int BLockReactor_Init (BLockReactor *o, BReactor *reactor)
{
o->reactor = reactor;
if (!BThreadSignal_Init(&o->thread_signal, reactor, thread_signal_handler)) {
BLog(BLOG_ERROR, "BThreadSignal_Init failed");
goto fail0;
}
if (sem_init(&o->sem1, 0, 0) < 0) {
BLog(BLOG_ERROR, "sem_init failed");
goto fail1;
}
if (sem_init(&o->sem2, 0, 0) < 0) {
BLog(BLOG_ERROR, "sem_init failed");
goto fail2;
}
#ifndef NDEBUG
o->locked = 0;
#endif
DebugObject_Init(&o->d_obj);
return 1;
fail2:
if (sem_close(&o->sem1) < 0) {
BLog(BLOG_ERROR, "sem_close failed");
}
fail1:
BThreadSignal_Free(&o->thread_signal);
fail0:
return 0;
}
void BLockReactor_Free (BLockReactor *o)
{
DebugObject_Free(&o->d_obj);
#ifndef NDEBUG
ASSERT(!o->locked)
#endif
if (sem_destroy(&o->sem2) < 0) {
BLog(BLOG_ERROR, "sem_close failed");
}
if (sem_destroy(&o->sem1) < 0) {
BLog(BLOG_ERROR, "sem_close failed");
}
BThreadSignal_Free(&o->thread_signal);
}
int BLockReactor_Thread_Lock (BLockReactor *o)
{
DebugObject_Access(&o->d_obj);
#ifndef NDEBUG
ASSERT(!o->locked)
#endif
if (!BThreadSignal_Thread_Signal(&o->thread_signal)) {
return 0;
}
ASSERT_FORCE(sem_wait(&o->sem1) == 0)
#ifndef NDEBUG
o->locked = 1;
#endif
return 1;
}
void BLockReactor_Thread_Unlock (BLockReactor *o)
{
DebugObject_Access(&o->d_obj);
#ifndef NDEBUG
ASSERT(o->locked)
#endif
#ifndef NDEBUG
o->locked = 0;
#endif
ASSERT_FORCE(sem_post(&o->sem2) == 0)
}