sem_timedwait man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]

SEM_TIMEDWAIT(3)	 BSD Library Functions Manual	      SEM_TIMEDWAIT(3)

NAME
     sem_timedwait — lock a semaphore

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <semaphore.h>

     int
     sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);

DESCRIPTION
     The sem_timedwait() function locks the semaphore referenced by sem, as in
     the sem_wait(3) function.	However, if the semaphore cannot be locked
     without waiting for another process or thread to unlock the semaphore by
     performing a sem_post(3) function, this wait will be terminated when the
     specified timeout expires.

     The timeout will expire 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.

     Note that the timeout is based on the CLOCK_REALTIME clock.

     The validity of the abs_timeout is not checked if the semaphore can be
     locked immediately.

RETURN VALUES
     The sem_timedwait() function returns zero if the calling process success‐
     fully performed the semaphore lock operation on the semaphore designated
     by sem.  If the call was unsuccessful, the state of the semaphore is
     unchanged, and the function returns a value of -1 and sets the global
     variable errno to indicate the error.

ERRORS
     The sem_timedwait() function will fail if:

     [EINVAL]		The sem argument does not refer to a valid semaphore,
			or the process or thread would have blocked, and the
			abs_timeout parameter specified a nanoseconds field
			value less than zero or greater than or equal to 1000
			million.

     [ETIMEDOUT]	The semaphore could not be locked before the specified
			timeout expired.

     [EINTR]		A signal interrupted this function.

SEE ALSO
     sem_post(3), sem_trywait(3), sem_wait(3), sem(4)

STANDARDS
     The sem_timedwait() function conforms to IEEE Std 1003.1-2004
     (“POSIX.1”).

HISTORY
     The function first appeared in FreeBSD 5.0.

BSD				 March 3, 2008				   BSD
[top]

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
...................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net