Use the pthread_mutex_reltimedlock_np(3C) function to attempt until a specified amount of time elapses to lock a mutex object.
The timeout expires when the time interval specified by rel_timeout passes, as measured by the CLOCK_REALTIME clock, or if the time interval specified by rel_timeout is negative at the time of the call.
int pthread_mutex_reltimedlock_np(pthread_mutex_t *restrict mutex, const struct timespec *restrict rel_timeout);
#include <pthread.h> #include <time.h> pthread_mutex_t mutex; timestruct_t rel_timeout; int ret; ret = pthread_mutex_reltimedlock_np(&mutex, &rel_timeout);
The pthread_mutex_reltimedlock_np() function returns 0 if it locks the mutex successfully. Otherwise, an error number is returned to indicate the error.
The mutex was created with the protocol attribute having the value PTHREAD_PRIO_PROTECT and the calling thread's priority is higher than the mutex's current priority ceiling.Description:
The value specified by mutex does not refer to an initialized mutex object.Description:
The process or thread would have blocked, and the abs_timeout parameter specified a nanoseconds field value less than 0 or greater than or equal to 1000 million.
The mutex could not be locked before the specified timeout expired.
See the discussion in pthread_mutex_lock Return Values.