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-rw-r--r--pthreads/src/pthread_barrier_wait.c104
1 files changed, 0 insertions, 104 deletions
diff --git a/pthreads/src/pthread_barrier_wait.c b/pthreads/src/pthread_barrier_wait.c
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--- a/pthreads/src/pthread_barrier_wait.c
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-/*
- * pthread_barrier_wait.c
- *
- * Description:
- * This translation unit implements barrier primitives.
- *
- * --------------------------------------------------------------------------
- *
- * Pthreads-win32 - POSIX Threads Library for Win32
- * Copyright(C) 1998 John E. Bossom
- * Copyright(C) 1999,2005 Pthreads-win32 contributors
- *
- * Contact Email: rpj@callisto.canberra.edu.au
- *
- * The current list of contributors is contained
- * in the file CONTRIBUTORS included with the source
- * code distribution. The list can also be seen at the
- * following World Wide Web location:
- * http://sources.redhat.com/pthreads-win32/contributors.html
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library in the file COPYING.LIB;
- * if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- */
-
-#include "pthread.h"
-#include "implement.h"
-
-
-int
-pthread_barrier_wait (pthread_barrier_t * barrier)
-{
- int result;
- pthread_barrier_t b;
-
- ptw32_mcs_local_node_t node;
-
- if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
- {
- return EINVAL;
- }
-
- ptw32_mcs_lock_acquire(&(*barrier)->lock, &node);
-
- b = *barrier;
- if (--b->nCurrentBarrierHeight == 0)
- {
- /*
- * We are the last thread to arrive at the barrier before it releases us.
- * Move our MCS local node to the global scope barrier handle so that the
- * last thread out (not necessarily us) can release the lock.
- */
- ptw32_mcs_node_transfer(&b->proxynode, &node);
-
- /*
- * Any threads that have not quite entered sem_wait below when the
- * multiple_post has completed will nevertheless continue through
- * the semaphore (barrier).
- */
- result = (b->nInitialBarrierHeight > 1
- ? sem_post_multiple (&(b->semBarrierBreeched),
- b->nInitialBarrierHeight - 1) : 0);
- }
- else
- {
- ptw32_mcs_lock_release(&node);
- /*
- * Use the non-cancelable version of sem_wait().
- *
- * It is possible that all nInitialBarrierHeight-1 threads are
- * at this point when the last thread enters the barrier, resets
- * nCurrentBarrierHeight = nInitialBarrierHeight and leaves.
- * If pthread_barrier_destroy is called at that moment then the
- * barrier will be destroyed along with the semas.
- */
- result = ptw32_semwait (&(b->semBarrierBreeched));
- }
-
- if ((PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_INCREMENT_LONG((PTW32_INTERLOCKED_LONGPTR)&b->nCurrentBarrierHeight)
- == (PTW32_INTERLOCKED_LONG)b->nInitialBarrierHeight)
- {
- /*
- * We are the last thread to cross this barrier
- */
- ptw32_mcs_lock_release(&b->proxynode);
- if (0 == result)
- {
- result = PTHREAD_BARRIER_SERIAL_THREAD;
- }
- }
-
- return (result);
-}