11-11-2013
the condition is true if the specified file in variable exist...
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LEARN ABOUT OSF1
pthread_cond_signal
pthread_cond_signal(3) Library Functions Manual pthread_cond_signal(3)
NAME
pthread_cond_signal - Wakes at least one thread that is waiting on the specified condition variable.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_cond_signal(
pthread_cond_t *cond);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Condition variable to be signaled.
DESCRIPTION
This routine unblocks at least one thread waiting on the specified condition variable cond. Calling this routine implies that data guarded
by the associated mutex has changed, thus it might be possible for one of the waiting threads to proceed. In general, only one thread will
be released.
If no threads are waiting on the specified condition variable, this routine takes no action. The signal does not propagate to the next
condition variable wait.
This routine should be called when any thread waiting on the specified condition variable might find its predicate true, but only one
thread should proceed. If more than one thread can proceed, or if any of the threads would not be able to proceed, then you must use
pthread_cond_broadcast(3).
The scheduling policy determines which thread is awakened. For policies SCHED_FIFO and SCHED_RR, a blocked thread is chosen in priority
order, using first-in/first-out (FIFO) within priorities.
If the calling thread holds the lock to the target condition variable's associated mutex while setting the variable's wait predicate, that
thread can call pthread_cond_signal(3) to signal the variable even after releasing the lock on that mutex. However, for more predictable
scheduling behavior, call pthread_cond_signal(3) before releasing the target condition variable's associated mutex.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by cond is not a valid condition variable.
ERRORS
None
RELATED INFORMATION
Functions: pthread_cond_broadcast(3), pthread_cond_destroy(3), pthread_cond_init(3), pthread_cond_timedwait(3), pthread_cond_wait(3)
Manuals: Guide to DECthreads and Programmer's Guide
delim off
pthread_cond_signal(3)