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Light implementation of pthread_mutexes

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This commit is contained in:
gbeauche 2004-01-04 06:55:50 +00:00
parent f054ce8648
commit 9723f1d495
1 changed files with 107 additions and 0 deletions
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107
SheepShaver/src/Unix/Linux/sheepthreads.c
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@ -170,6 +170,11 @@ void pthread_testcancel(void)
* Spinlocks
*/
static int try_acquire_spinlock(int *lock)
{
return test_and_set(lock, 1) == 0;
}
static void acquire_spinlock(volatile int *lock)
{
do {
@ -183,6 +188,108 @@ static void release_spinlock(int *lock)
}
/*
* Initialize mutex
*/
int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutex_attr)
{
// pthread_init_lock
mutex->__m_lock.__status = 0;
mutex->__m_lock.__spinlock = 0;
mutex->__m_kind = mutex_attr ? mutex_attr->__mutexkind : PTHREAD_MUTEX_TIMED_NP;
mutex->__m_count = 0;
mutex->__m_owner = NULL;
return 0;
}
/*
* Destroy mutex
*/
int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
switch (mutex->__m_kind) {
case PTHREAD_MUTEX_TIMED_NP:
return (mutex->__m_lock.__status != 0) ? EBUSY : 0;
default:
return EINVAL;
}
}
/*
* Lock mutex
*/
int pthread_mutex_lock(pthread_mutex_t *mutex)
{
switch (mutex->__m_kind) {
case PTHREAD_MUTEX_TIMED_NP:
acquire_spinlock(&mutex->__m_lock.__spinlock);
return 0;
default:
return EINVAL;
}
}
/*
* Try to lock mutex
*/
int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
switch (mutex->__m_kind) {
case PTHREAD_MUTEX_TIMED_NP:
if (!try_acquire_spinlock(&mutex->__m_lock.__spinlock))
return EBUSY;
return 0;
default:
return EINVAL;
}
}
/*
* Unlock mutex
*/
int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
switch (mutex->__m_kind) {
case PTHREAD_MUTEX_TIMED_NP:
release_spinlock(&mutex->__m_lock.__spinlock);
return 0;
default:
return EINVAL;
}
}
/*
* Create mutex attribute
*/
int pthread_mutexattr_init(pthread_mutexattr_t *attr)
{
attr->__mutexkind = PTHREAD_MUTEX_TIMED_NP;
return 0;
}
/*
* Destroy mutex attribute
*/
int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
{
return 0;
}
/*
* Init semaphore
*/