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#include <unistd.h>
#include <sched.h>
#include <errno.h>
#include <pthread.h>
#include "thread_internal.h"
/* will never return EINVAL ! */
int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
_pthread_descr this;
__THREAD_INIT();
this = __thread_self();
if (this!=mutex->owner) {
/* wait for mutex to free */
if (__pthread_trylock(&(mutex->lock))) {
(*(__errno_location()))=EBUSY;
return -1;
}
mutex->owner=this;
}
else if (mutex->kind==PTHREAD_MUTEX_ERRORCHECK_NP)
{
(*(__errno_location()))=EDEADLK;
return -1;
}
if (mutex->kind==PTHREAD_MUTEX_RECURSIVE_NP) ++(mutex->count);
return 0;
}
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