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

    NAME

    pthread_cond_signal, pthread_cond_broadcast - signal or broadcast a condition
     
    

    SYNOPSIS

    cc -mt [ flag... ] file... -lpthread [ library... ]
    #include <pthread.h>
    
    int pthread_cond_signal(pthread_cond_t *cond);
    

    int pthread_cond_broadcast(pthread_cond_t *cond);
    

     

    DESCRIPTION

    These two functions are used to unblock threads blocked on a condition variable.

    The pthread_cond_signal() call unblocks at least one of the threads that are blocked on the specified condition variable cond (if any threads are blocked on cond).

    The pthread_cond_broadcast() call unblocks all threads currently blocked on the specified condition variable cond.

    If more than one thread is blocked on a condition variable, the scheduling policy determines the order in which threads are unblocked. When each thread unblocked as a result of a pthread_cond_signal() or pthread_cond_broadcast() returns from its call to pthread_cond_wait() or pthread_cond_timedwait(), the thread owns the mutex with which it called pthread_cond_wait() or pthread_cond_timedwait(). The thread(s) that are unblocked contend for the mutex according to the scheduling policy (if applicable), and as if each had called pthread_mutex_lock().

    The pthread_cond_signal() or pthread_cond_broadcast() functions may be called by a thread whether or not it currently owns the mutex that threads calling pthread_cond_wait() or pthread_cond_timedwait() have associated with the condition variable during their waits; however, if predictable scheduling behavior is required, then that mutex is locked by the thread calling pthread_cond_signal() or pthread_cond_broadcast().

    The pthread_cond_signal() and pthread_cond_broadcast() functions have no effect if there are no threads currently blocked on cond.  

    RETURN VALUES

    If successful, the pthread_cond_signal() and pthread_cond_broadcast() functions return 0. Otherwise, an error number is returned to indicate the error.  

    ERRORS

    The pthread_cond_signal() and pthread_cond_broadcast() function may fail if:

    EINVAL

    The value cond does not refer to an initialized condition variable.

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    pthread_cond_init(3C), pthread_cond_wait(3C), pthread_cond_timedwait(3C), attributes(5), condition(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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