"PTHREAD_BARRIER_WAIT"(P) manual page

From dd657ad3f1428b026486db3ec36691df17ddf515 Mon Sep 17 00:00:00 2001 From: "Steve M. Robbins" Date: Sat, 22 Oct 2011 04:54:51 +0200 Subject: Import nyquist_3.05.orig.tar.gz [dgit import orig nyquist_3.05.orig.tar.gz] --- liblo/pthreads.2/manual/pthread_barrier_wait.html | 167 ++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 liblo/pthreads.2/manual/pthread_barrier_wait.html (limited to 'liblo/pthreads.2/manual/pthread_barrier_wait.html') diff --git a/liblo/pthreads.2/manual/pthread_barrier_wait.html b/liblo/pthreads.2/manual/pthread_barrier_wait.html new file mode 100644 index 0000000..4db0594 --- /dev/null +++ b/liblo/pthreads.2/manual/pthread_barrier_wait.html @@ -0,0 +1,167 @@ + + + + + "PTHREAD_BARRIER_WAIT"(P) manual page + + + + + + + + +

POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

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(3) +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 determined 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. +

Pthreads-w32 defines _POSIX_BARRIERS to indicate +that this routine is implemented and may be used.

Rationale

None. +

Future Directions

None. +

Known Bugs

In + pthreads-win32, + pthread_barrier_wait may deadlock if the number of running + threads able to wait on the barrier object exceeds the value given + as the count parameter in + pthread_barrier_init(3). +

+See Also

pthread_barrier_destroy(3), +pthread_barrier_init(3), +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 +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
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Synopsis +
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Description +
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Return + Value +
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Errors +
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Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
Known + Bugs +
+
See + Also +
+
Copyright +
+

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