1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "apr_arch_atomic.h"
19 #ifdef USE_ATOMICS_IA32
21 APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
23 #if defined (NEED_ATOMICS_GENERIC64)
24 return apr__atomic_generic64_init(p);
30 APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
35 APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
40 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
42 asm volatile ("lock; xaddl %0,%1"
43 : "=r" (val), "=m" (*mem)
44 : "0" (val), "m" (*mem)
49 APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
51 asm volatile ("lock; subl %1, %0"
53 : "m" (*(mem)), "r" (val)
57 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
59 return apr_atomic_add32(mem, 1);
62 APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
66 asm volatile ("lock; decl %0; setnz %1"
67 : "=m" (*mem), "=qm" (prev)
74 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
79 asm volatile ("lock; cmpxchgl %1, %2"
81 : "r" (with), "m" (*(mem)), "0"(cmp)
86 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
88 apr_uint32_t prev = val;
90 asm volatile ("xchgl %0, %1"
91 : "=r" (prev), "+m" (*mem)
96 APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
99 #if APR_SIZEOF_VOIDP == 4
100 asm volatile ("lock; cmpxchgl %2, %1"
101 : "=a" (prev), "=m" (*mem)
102 : "r" (with), "m" (*mem), "0" (cmp));
103 #elif APR_SIZEOF_VOIDP == 8
104 asm volatile ("lock; cmpxchgq %q2, %1"
105 : "=a" (prev), "=m" (*mem)
106 : "r" ((unsigned long)with), "m" (*mem),
107 "0" ((unsigned long)cmp));
109 #error APR_SIZEOF_VOIDP value not supported
114 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
117 #if APR_SIZEOF_VOIDP == 4
118 asm volatile ("xchgl %2, %1"
119 : "=a" (prev), "+m" (*mem)
121 #elif APR_SIZEOF_VOIDP == 8
122 asm volatile ("xchgq %q2, %1"
123 : "=a" (prev), "+m" (*mem)
126 #error APR_SIZEOF_VOIDP value not supported
131 #endif /* USE_ATOMICS_IA32 */