mirror of https://github.com/PCSX2/pcsx2.git
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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* pthread_barrier_wait.c
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*
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* Description:
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* This translation unit implements barrier primitives.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_barrier_wait (pthread_barrier_t * barrier)
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{
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int result;
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pthread_barrier_t b;
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ptw32_mcs_local_node_t node;
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if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
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{
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return EINVAL;
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}
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ptw32_mcs_lock_acquire(&(*barrier)->lock, &node);
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b = *barrier;
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if (--b->nCurrentBarrierHeight == 0)
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{
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/*
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* We are the last thread to arrive at the barrier before it releases us.
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* Move our MCS local node to the global scope barrier handle so that the
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* last thread out (not necessarily us) can release the lock.
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*/
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ptw32_mcs_node_transfer(&b->proxynode, &node);
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/*
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* Any threads that have not quite entered sem_wait below when the
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* multiple_post has completed will nevertheless continue through
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* the semaphore (barrier).
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*/
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result = (b->nInitialBarrierHeight > 1
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? sem_post_multiple (&(b->semBarrierBreeched),
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b->nInitialBarrierHeight - 1) : 0);
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}
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else
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{
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ptw32_mcs_lock_release(&node);
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/*
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* Use the non-cancelable version of sem_wait().
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*
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* It is possible that all nInitialBarrierHeight-1 threads are
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* at this point when the last thread enters the barrier, resets
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* nCurrentBarrierHeight = nInitialBarrierHeight and leaves.
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* If pthread_barrier_destroy is called at that moment then the
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* barrier will be destroyed along with the semas.
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*/
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result = ptw32_semwait (&(b->semBarrierBreeched));
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}
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if ((PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_INCREMENT_LONG((PTW32_INTERLOCKED_LONGPTR)&b->nCurrentBarrierHeight)
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== (PTW32_INTERLOCKED_LONG)b->nInitialBarrierHeight)
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{
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/*
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* We are the last thread to cross this barrier
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*/
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ptw32_mcs_lock_release(&b->proxynode);
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if (0 == result)
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{
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result = PTHREAD_BARRIER_SERIAL_THREAD;
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}
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}
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return (result);
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}
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