PTHREAD_RWLOCK_TIMEDW... BSD Library Functions Manual PTHREAD_RWLOCK_TIMEDW...NAMEpthread_rwlock_timedwrlock — acquire a read-write lock for writing or
give up after a specified period
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock,
const struct timespec *abs_timeout);
DESCRIPTION
This function acquires a write lock on the read-write lock rwlock. How‐
ever, if the lock cannot be acquired without waiting for another thread
to unlock the lock, this wait shall be terminated when abs_timeout
expires.
If the thread should be interrupted by a signal, the
pthread_rwlock_timedwrlock() function will be automatically restarted
after the thread returns from the signal handler.
The calling thread may deadlock if at the time the call is made it holds
rwlock. The results are undefined if this function is called with an
uninitialized read-write lock.
IMPLEMENTATION NOTES
To prevent writer starvation, writers are favored over readers.
RETURN VALUES
If successful, the pthread_rwlock_timedwrlock() function will return
zero. Otherwise, an error number will be returned to indicate the error.
This function shall not return an error code of EINTR.
ERRORS
The pthread_rwlock_timedwrlock() function shall fail if:
[ETIMEDOUT] The lock could not be acquired before the specified
timeout expired.
The pthread_rwlock_timedrwlock() function may fail if:
[EDEADLK] The calling thread already holds rwlock.
[EINVAL] The value specified by rwlock does not refer to an
initialized read-write lock object, or the abs_timeout
nanosecond value is less than zero or greater than or
equal to 1 billion.
SEE ALSOpthread_rwlock_init(3), pthread_rwlock_timedrdlock(3),
pthread_rwlock_unlock(3)STANDARDS
The pthread_rwlock_timedwrlock() function is expected to conform to
ISO/IEC 9945-1:1996 (“POSIX.1”).
HISTORY
The pthread_rwlock_timedwrlock() function first appeared in FreeBSD 5.2.
BSD January 16, 2004 BSD
