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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [libgomp/] [critical.c] - Blame information for rev 318

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/* Copyright (C) 2005 Free Software Foundation, Inc.
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   Contributed by Richard Henderson <rth@redhat.com>.
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU Lesser General Public License as published by
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   the Free Software Foundation; either version 2.1 of the License, or
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   (at your option) any later version.
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   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
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   more details.
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   You should have received a copy of the GNU Lesser General Public License
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   along with libgomp; see the file COPYING.LIB.  If not, write to the
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   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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/* As a special exception, if you link this library with other files, some
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   of which are compiled with GCC, to produce an executable, this library
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   does not by itself cause the resulting executable to be covered by the
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   GNU General Public License.  This exception does not however invalidate
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   any other reasons why the executable file might be covered by the GNU
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   General Public License.  */
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/* This file handles the CRITICAL construct.  */
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#include "libgomp.h"
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#include <stdlib.h>
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static gomp_mutex_t default_lock;
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void
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GOMP_critical_start (void)
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{
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  gomp_mutex_lock (&default_lock);
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}
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void
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GOMP_critical_end (void)
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{
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  gomp_mutex_unlock (&default_lock);
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}
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#ifndef HAVE_SYNC_BUILTINS
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static gomp_mutex_t create_lock_lock;
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#endif
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void
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GOMP_critical_name_start (void **pptr)
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{
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  gomp_mutex_t *plock;
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  /* If a mutex fits within the space for a pointer, and is zero initialized,
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     then use the pointer space directly.  */
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  if (GOMP_MUTEX_INIT_0
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      && sizeof (gomp_mutex_t) <= sizeof (void *)
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      && __alignof (gomp_mutex_t) <= sizeof (void *))
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    plock = (gomp_mutex_t *)pptr;
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  /* Otherwise we have to be prepared to malloc storage.  */
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  else
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    {
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      plock = *pptr;
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      if (plock == NULL)
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        {
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#ifdef HAVE_SYNC_BUILTINS
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          gomp_mutex_t *nlock = gomp_malloc (sizeof (gomp_mutex_t));
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          gomp_mutex_init (nlock);
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          plock = __sync_val_compare_and_swap (pptr, NULL, nlock);
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          if (plock != NULL)
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            {
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              gomp_mutex_destroy (nlock);
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              free (nlock);
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            }
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          else
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            plock = nlock;
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#else
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          gomp_mutex_lock (&create_lock_lock);
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          plock = *pptr;
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          if (plock == NULL)
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            {
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              plock = gomp_malloc (sizeof (gomp_mutex_t));
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              gomp_mutex_init (plock);
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              __sync_synchronize ();
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              *pptr = plock;
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            }
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          gomp_mutex_unlock (&create_lock_lock);
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#endif
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        }
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    }
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  gomp_mutex_lock (plock);
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}
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void
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GOMP_critical_name_end (void **pptr)
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{
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  gomp_mutex_t *plock;
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  /* If a mutex fits within the space for a pointer, and is zero initialized,
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     then use the pointer space directly.  */
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  if (GOMP_MUTEX_INIT_0
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      && sizeof (gomp_mutex_t) <= sizeof (void *)
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      && __alignof (gomp_mutex_t) <= sizeof (void *))
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    plock = (gomp_mutex_t *)pptr;
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  else
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    plock = *pptr;
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  gomp_mutex_unlock (plock);
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}
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/* This mutex is used when atomic operations don't exist for the target
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   in the mode requested.  The result is not globally atomic, but works so
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   long as all parallel references are within #pragma omp atomic directives.
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   According to responses received from omp@openmp.org, appears to be within
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   spec.  Which makes sense, since that's how several other compilers
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   handle this situation as well.  */
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static gomp_mutex_t atomic_lock;
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void
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GOMP_atomic_start (void)
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{
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  gomp_mutex_lock (&atomic_lock);
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}
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void
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GOMP_atomic_end (void)
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{
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  gomp_mutex_unlock (&atomic_lock);
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}
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#if !GOMP_MUTEX_INIT_0
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static void __attribute__((constructor))
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initialize_critical (void)
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{
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  gomp_mutex_init (&default_lock);
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  gomp_mutex_init (&atomic_lock);
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#ifndef HAVE_SYNC_BUILTINS
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  gomp_mutex_init (&create_lock_lock);
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#endif
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}
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#endif

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