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authorDavi Arnaut <davi@apache.org>2007-07-04 18:18:51 +0000
committerDavi Arnaut <davi@apache.org>2007-07-04 18:18:51 +0000
commit6f18c2b96507e93adbd792f9716a96def46ba8ba (patch)
treedfb773235eba64fd17cb22870fe3db1cda1a7a36 /atomic
parent19ada038b5f7101e63c16225e14970375031a393 (diff)
downloadapr-6f18c2b96507e93adbd792f9716a96def46ba8ba.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: https://svn.apache.org/repos/asf/apr/apr/trunk@553290 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'atomic')
-rw-r--r--atomic/unix/builtins.c74
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 */