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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libgomp/] [critical.c] - Rev 273
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/* Copyright (C) 2005, 2009 Free Software Foundation, Inc. Contributed by Richard Henderson <rth@redhat.com>. This file is part of the GNU OpenMP Library (libgomp). Libgomp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgomp 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 General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* This file handles the CRITICAL construct. */ #include "libgomp.h" #include <stdlib.h> static gomp_mutex_t default_lock; void GOMP_critical_start (void) { gomp_mutex_lock (&default_lock); } void GOMP_critical_end (void) { gomp_mutex_unlock (&default_lock); } #ifndef HAVE_SYNC_BUILTINS static gomp_mutex_t create_lock_lock; #endif void GOMP_critical_name_start (void **pptr) { gomp_mutex_t *plock; /* If a mutex fits within the space for a pointer, and is zero initialized, then use the pointer space directly. */ if (GOMP_MUTEX_INIT_0 && sizeof (gomp_mutex_t) <= sizeof (void *) && __alignof (gomp_mutex_t) <= sizeof (void *)) plock = (gomp_mutex_t *)pptr; /* Otherwise we have to be prepared to malloc storage. */ else { plock = *pptr; if (plock == NULL) { #ifdef HAVE_SYNC_BUILTINS gomp_mutex_t *nlock = gomp_malloc (sizeof (gomp_mutex_t)); gomp_mutex_init (nlock); plock = __sync_val_compare_and_swap (pptr, NULL, nlock); if (plock != NULL) { gomp_mutex_destroy (nlock); free (nlock); } else plock = nlock; #else gomp_mutex_lock (&create_lock_lock); plock = *pptr; if (plock == NULL) { plock = gomp_malloc (sizeof (gomp_mutex_t)); gomp_mutex_init (plock); __sync_synchronize (); *pptr = plock; } gomp_mutex_unlock (&create_lock_lock); #endif } } gomp_mutex_lock (plock); } void GOMP_critical_name_end (void **pptr) { gomp_mutex_t *plock; /* If a mutex fits within the space for a pointer, and is zero initialized, then use the pointer space directly. */ if (GOMP_MUTEX_INIT_0 && sizeof (gomp_mutex_t) <= sizeof (void *) && __alignof (gomp_mutex_t) <= sizeof (void *)) plock = (gomp_mutex_t *)pptr; else plock = *pptr; gomp_mutex_unlock (plock); } /* This mutex is used when atomic operations don't exist for the target in the mode requested. The result is not globally atomic, but works so long as all parallel references are within #pragma omp atomic directives. According to responses received from omp@openmp.org, appears to be within spec. Which makes sense, since that's how several other compilers handle this situation as well. */ static gomp_mutex_t atomic_lock; void GOMP_atomic_start (void) { gomp_mutex_lock (&atomic_lock); } void GOMP_atomic_end (void) { gomp_mutex_unlock (&atomic_lock); } #if !GOMP_MUTEX_INIT_0 static void __attribute__((constructor)) initialize_critical (void) { gomp_mutex_init (&default_lock); gomp_mutex_init (&atomic_lock); #ifndef HAVE_SYNC_BUILTINS gomp_mutex_init (&create_lock_lock); #endif } #endif
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