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author | davi <davi@13f79535-47bb-0310-9956-ffa450edef68> | 2007-07-04 18:18:51 +0000 |
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committer | davi <davi@13f79535-47bb-0310-9956-ffa450edef68> | 2007-07-04 18:18:51 +0000 |
commit | a93af023a43e30473269863905ee283cc95cfa6d (patch) | |
tree | dfb773235eba64fd17cb22870fe3db1cda1a7a36 /atomic | |
parent | 7a657ecb24906e5366063f153e2c9aa4935a90a4 (diff) | |
download | libapr-a93af023a43e30473269863905ee283cc95cfa6d.tar.gz |
Given a modern compiler, this patch provides fast atomic operations on various
platforms (alpha, ia32, ia64, powerpc, etc).
Tested on:
2x Pentium D, Ubuntu 7.04, gcc 4.1.2
16x Itanium II, RHEL 5, gcc 4.1.1
PR: 42806
git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@553290 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'atomic')
-rw-r--r-- | atomic/unix/builtins.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/atomic/unix/builtins.c b/atomic/unix/builtins.c new file mode 100644 index 000000000..274599614 --- /dev/null +++ b/atomic/unix/builtins.c @@ -0,0 +1,74 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "apr_arch_atomic.h" + +#ifdef USE_ATOMICS_BUILTINS + +APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) +{ + return APR_SUCCESS; +} + +APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem) +{ + return *mem; +} + +APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + *mem = val; +} + +APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + return __sync_fetch_and_add(mem, val); +} + +APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + __sync_fetch_and_sub(mem, val); +} + +APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) +{ + return __sync_fetch_and_add(mem, 1); +} + +APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) +{ + return __sync_sub_and_fetch(mem, 1); +} + +APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, + apr_uint32_t cmp) +{ + return __sync_val_compare_and_swap(mem, cmp, with); +} + +APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + __sync_synchronize(); + + return __sync_lock_test_and_set(mem, val); +} + +APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp) +{ + return (void*) __sync_val_compare_and_swap(mem, cmp, with); +} + +#endif /* USE_ATOMICS_BUILTINS */ |