pthread_cond_signal()

Unblock a thread that's waiting on a condition variable

Synopsis:

#include <pthread.h>

int pthread_cond_signal( pthread_cond_t* cond );

Arguments:

cond

A pointer to the pthread_cond_t object for which you want to unblock the highest-priority thread.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_cond_signal() function unblocks the highest priority thread that's waiting on the condition variable, cond.

If more than one thread at the highest priority is waiting, pthread_cond_signal() unblocks the one that has been waiting the longest.

Returns:

EOK

Success.

EFAULT

A fault occurred trying to access the buffers provided.

EINVAL

Invalid condition variable cond.

Classification:

POSIX 1003.1 THR

See also:

pthread_cond_broadcast(), pthread_cond_wait(), SyncCondvarSignal().

Processes and Threads chapter of Getting Started with QNX Neutrino