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pthread_mutex_timedlock(3) [freebsd man page]


pthread_mutex_timedlock -- lock a mutex without blocking indefinitely LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread.h> #include <time.h> int pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *abs_timeout); DESCRIPTION
The pthread_mutex_timedlock() function will lock mutex. If it is already locked the calling thread will block until the mutex becomes avail- able or the timeout, specified by abs_timeout, expires. The time of the timeout is an absolute time and is not relative to the current time. RETURN VALUES
If successful, pthread_mutex_timedlock() will return zero, otherwise an error number will be returned to indicate the error. ERRORS
The pthread_mutex_timedlock() function will fail if: [EINVAL] 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. [EINVAL] The process or thread would have blocked, and abs_timeout specified a nanosecond value less than zero or greater than or equal to 1 billion. [EINVAL] The mutex parameter is invalid. [ETIMEDOUT] The mutex could not be locked before the timeout expired. [EAGAIN] The mutex could not be acquired because the maximum number of recursive locks for the mutex has been exceeded. [EDEADLK] The current thread already owns the mutex. SEE ALSO
pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_trylock(3), pthread_mutex_unlock(3) STANDARDS
The pthread_mutex_timedlock() function is expected to conform to ISO/IEC 9945-1:1996 (``POSIX.1''). BSD
December 30, 2003 BSD

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pthread_mutex_timedlock(3C)				   Standard C Library Functions 			       pthread_mutex_timedlock(3C)

pthread_mutex_timedlock, pthread_mutex_reltimedlock_np - lock a mutex SYNOPSIS
cc -mt [ flag... ] file... [ library... ] #include <pthread.h> #include <time.h> int pthread_mutex_timedlock(pthread_mutex_t *restrict mutex, const struct timespec *restrict abs_timeout); int pthread_mutex_reltimedlock_np(pthread_mutex_t *restrict mutex, const struct timespec *restrict rel_timeout); DESCRIPTION
The pthread_mutex_timedlock() function locks the mutex object referenced by mutex. If the mutex is already locked, the calling thread blocks until the mutex becomes available as in the pthread_mutex_lock(3C). If the mutex cannot be locked without waiting for another thread to unlock the mutex, this wait is terminated when the specified timeout expires. The pthread_mutex_reltimedlock_np() function is identical to the pthread_mutex_timedlock() function, except that the timeout is specified as a relative time interval. For pthread_mutex_timedlock(), the timeout expires when the absolute time specified by abs_timeout passes, as measured by the clock on which timeouts are based (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. For pthread_mutex_reltimedlock_np(), 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. The resolution of the timeout is the resolution of the CLOCK_REALTIME clock. The timespec data type is defined in the <time.h>header. Under no circumstance will either function fail with a timeout if the mutex can be locked immediately. The validity of the timeout parame- ter is not checked if the mutex can be locked immediately. As a consequence of the priority inheritance rules (for mutexes initialized with the PRIO_INHERIT protocol), if a timed mutex wait is ter- minated because its timeout expires, the priority of the owner of the mutex is adjusted as necessary to reflect the fact that this thread is no longer among the threads waiting for the mutex. RETURN VALUES
Upon successful completion, the pthread_mutex_timedlock() and pthread_mutex_reltimedlock_np() functions return 0. Otherwise, an error num- ber is returned to indicate the error. ERRORS
The pthread_mutex_timedlock() and pthread_mutex_reltimedlock_np() functions will fail for the same reasons as pthread_mutex_lock(3C). In addition, they will fail if: EINVAL The caller would have blocked and the timeout parameter specified a nanoseconds field value less than zero or greater than or equal to 1,000 million. ETIMEDOUT The mutex could not be locked before the specified timeout expired. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ The pthread_mutex_timedlock() is Standard. The pthread_mutex_reltimedlock_np() function is Stable. SEE ALSO
time(2), pthread_mutex_destroy(3C), pthread_mutex_lock(3C), pthread_mutex_trylock(3C), attributes(5), standards(5) SunOS 5.11 5 Jun 2007 pthread_mutex_timedlock(3C)
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