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pthread: implement pthread_mutex_trylock()

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Fixes #2141
This commit is contained in:
Christian Prochaska 2016-10-18 13:01:03 +02:00 committed by Christian Helmuth
parent 9572ff9413
commit 340a18007c
1 changed files with 63 additions and 0 deletions
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63
repos/libports/src/lib/pthread/thread.cc
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@ -320,6 +320,57 @@ extern "C" {
return 0;
}
int trylock()
{
if (mutexattr.type == PTHREAD_MUTEX_RECURSIVE) {
Lock::Guard lock_guard(owner_and_counter_lock);
if (lock_count == 0) {
owner = pthread_self();
lock_count++;
mutex_lock.lock();
return 0;
}
/* the mutex is already locked */
if (pthread_self() == owner) {
lock_count++;
return 0;
} else {
return EBUSY;
}
}
if (mutexattr.type == PTHREAD_MUTEX_ERRORCHECK) {
Lock::Guard lock_guard(owner_and_counter_lock);
if (lock_count == 0) {
owner = pthread_self();
mutex_lock.lock();
return 0;
}
/* the mutex is already locked */
if (pthread_self() != owner) {
return EBUSY;
} else
return EDEADLK;
}
/* PTHREAD_MUTEX_NORMAL or PTHREAD_MUTEX_DEFAULT */
Lock::Guard lock_guard(owner_and_counter_lock);
if (lock_count == 0) {
owner = pthread_self();
mutex_lock.lock();
return 0;
}
return EBUSY;
}
int unlock()
{
@ -431,6 +482,18 @@ extern "C" {
}
int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
if (!mutex)
return EINVAL;
if (*mutex == PTHREAD_MUTEX_INITIALIZER)
pthread_mutex_init(mutex, 0);
return (*mutex)->trylock();
}
int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
if (!mutex)