#include <pthread.h> #include <time.h> int pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rwlock, const struct timespec *restrict abs_timeout);
The calling thread acquires the write lock if no other reader thread or writer thread holds the read-write lock rwlock. If the lock cannot be acquired without waiting for other threads to unlock the lock, this wait will be terminated when the specified timeout expires. The timeout expires when the absolute time specified by abs_timeoutpasses, as measured by the CLOCK_REALTIME clock (that is, when the value of that clock equals or exceeds abs_timeout) or if the absolute time specified by abs_timeout has already been passed at the time of the call. The pthread_rwlock_reltimedwrlock_np() function is identical to the pthread_rwlock_timedwrlock() function, except that the timeout is specified as a relative time interval.