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sem_post (3)
  • sem_post (3) ( Solaris man: Библиотечные вызовы )
  • sem_post (3) ( FreeBSD man: Библиотечные вызовы )
  • >> sem_post (3) ( Linux man: Библиотечные вызовы )
  • sem_post (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    sem_post - unlock a semaphore
     
    

    SYNOPSIS

    #include <semaphore.h>
    
    int sem_post(sem_t *sem);
    

    Link with -lrt or -pthread.  

    DESCRIPTION

    sem_post() increments (unlocks) the semaphore pointed to by sem. If the semaphore's value consequently becomes greater than zero, then another process or thread blocked in a sem_wait(3) call will be woken up and proceed to lock the semaphore.  

    RETURN VALUE

    sem_post() returns 0 on success; on error, the value of the semaphore is left unchanged, -1 is returned, and errno is set to indicate the error.  

    ERRORS

    EINVAL
    sem is not a valid semaphore.
     

    CONFORMING TO

    POSIX.1-2001.  

    NOTES

    sem_post() is async-signal-safe: it may be safely called within a signal handler.  

    EXAMPLE

    See sem_wait(3).  

    SEE ALSO

    sem_getvalue(3), sem_wait(3), sem_overview(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    EXAMPLE
    SEE ALSO
    COLOPHON


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