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PTHREAD_BARRIER_WAIT(P) PTHREAD_BARRIER_WAIT(P)
NAME
pthread_barrier_wait - synchronize at a barrier (ADVANCED REALTIME THREADS)
SYNOPSIS
#include <pthread.h>
int pthread_barrier_wait(pthread_barrier_t *barrier);
DESCRIPTION
The pthread_barrier_wait() function shall synchronize participating threads at the
barrier referenced by barrier. The calling thread shall block until the required
number of threads have called pthread_barrier_wait() specifying the barrier.
When the required number of threads have called pthread_barrier_wait() specifying
the barrier, the constant PTHREAD_BARRIER_SERIAL_THREAD shall be returned to one
unspecified thread and zero shall be returned to each of the remaining threads. At
this point, the barrier shall be reset to the state it had as a result of the most
recent pthread_barrier_init() function that referenced it.
The constant PTHREAD_BARRIER_SERIAL_THREAD is defined in <pthread.h> and its value
shall be distinct from any other value returned by pthread_barrier_wait().
The results are undefined if this function is called with an uninitialized barrier.
If a signal is delivered to a thread blocked on a barrier, upon return from the
signal handler the thread shall resume waiting at the barrier if the barrier wait
has not completed (that is, if the required number of threads have not arrived at
the barrier during the execution of the signal handler); otherwise, the thread
shall continue as normal from the completed barrier wait. Until the thread in the
signal handler returns from it, it is unspecified whether other threads may proceed
past the barrier once they have all reached it.
A thread that has blocked on a barrier shall not prevent any unblocked thread that
is eligible to use the same processing resources from eventually making forward
progress in its execution. Eligibility for processing resources shall be deter-
mined by the scheduling policy.
RETURN VALUE
Upon successful completion, the pthread_barrier_wait() function shall return
PTHREAD_BARRIER_SERIAL_THREAD for a single (arbitrary) thread synchronized at the
barrier and zero for each of the other threads. Otherwise, an error number shall be
returned to indicate the error.
ERRORS
The pthread_barrier_wait() function may fail if:
EINVAL The value specified by barrier does not refer to an initialized barrier
object.
This function shall not return an error code of [EINTR].
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
Applications using this function may be subject to priority inversion, as discussed
in the Base Definitions volume of IEEE Std 1003.1-2001, Section 3.285, Priority
Inversion.
The pthread_barrier_wait() function is part of the Barriers option and need not be
provided on all implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_barrier_destroy() , the Base Definitions volume of IEEE Std 1003.1-2001,
<pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
POSIX 2003 PTHREAD_BARRIER_WAIT(P)
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