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FreeBSD 11.0 - man page for pthread_cond_signal (freebsd section 3)

PTHREAD_COND_SIGNAL(3)					   BSD Library Functions Manual 				    PTHREAD_COND_SIGNAL(3)

NAME
pthread_cond_signal -- unblock a thread waiting for a condition variable
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h> int pthread_cond_signal(pthread_cond_t *cond);
DESCRIPTION
The pthread_cond_signal() function unblocks one thread waiting for the condition variable cond.
RETURN VALUES
If successful, the pthread_cond_signal() function will return zero, otherwise an error number will be returned to indicate the error.
ERRORS
The pthread_cond_signal() function will fail if: [EINVAL] The value specified by cond is invalid.
SEE ALSO
pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_timedwait(3), pthread_cond_wait(3)
STANDARDS
The pthread_cond_signal() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD
July 28, 1998 BSD

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