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author | Ben Cheng <bccheng@google.com> | 2013-03-28 11:14:20 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2013-03-28 12:40:33 -0700 |
commit | af0c51ac87ab2a87caa03fa108f0d164987a2764 (patch) | |
tree | 4b8b470f7c5b69642fdab8d0aa1fbc148d02196b /gcc-4.8/libgomp/critical.c | |
parent | d87cae247d39ebf4f5a6bf25c932a14d2fdb9384 (diff) | |
download | toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.gz toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.bz2 toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.zip |
[GCC 4.8] Initial check-in of GCC 4.8.0
Change-Id: I0719d8a6d0f69b367a6ab6f10eb75622dbf12771
Diffstat (limited to 'gcc-4.8/libgomp/critical.c')
-rw-r--r-- | gcc-4.8/libgomp/critical.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/gcc-4.8/libgomp/critical.c b/gcc-4.8/libgomp/critical.c new file mode 100644 index 000000000..084f01b01 --- /dev/null +++ b/gcc-4.8/libgomp/critical.c @@ -0,0 +1,148 @@ +/* Copyright (C) 2005-2013 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) +{ + /* There is an implicit flush on entry to a critical region. */ + __atomic_thread_fence (MEMMODEL_RELEASE); + 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 |