diff options
| -rw-r--r-- | atomic/unix/ia32.c | 111 | ||||
| -rw-r--r-- | include/arch/unix/apr_arch_atomic.h | 2 |
2 files changed, 113 insertions, 0 deletions
diff --git a/atomic/unix/ia32.c b/atomic/unix/ia32.c new file mode 100644 index 000000000..bcf9d5661 --- /dev/null +++ b/atomic/unix/ia32.c @@ -0,0 +1,111 @@ +/* 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_IA32 + +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) +{ + asm volatile ("lock; xaddl %0,%1" + : "=r" (val), "=m" (*mem) + : "0" (val), "m" (*mem) + : "memory", "cc"); + return val; +} + +APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + asm volatile ("lock; subl %1, %0" + : /* no output */ + : "m" (*(mem)), "r" (val) + : "memory", "cc"); +} + +APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) +{ + return apr_atomic_add32(mem, 1); +} + +APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) +{ + unsigned char prev; + + asm volatile ("lock; decl %0; setnz %1" + : "=m" (*mem), "=qm" (prev) + : "m" (*mem) + : "memory"); + + return prev; +} + +APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, + apr_uint32_t cmp) +{ + apr_uint32_t prev; + + asm volatile ("lock; cmpxchgl %1, %2" + : "=a" (prev) + : "r" (with), "m" (*(mem)), "0"(cmp) + : "memory", "cc"); + return prev; +} + +APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) +{ + apr_uint32_t prev = val; + + asm volatile ("lock; xchgl %0, %1" + : "=r" (prev) + : "m" (*(mem)), "0"(prev) + : "memory"); + return prev; +} + +APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp) +{ + void *prev; +#if APR_SIZEOF_VOIDP == 4 + asm volatile ("lock; cmpxchgl %2, %1" + : "=a" (prev), "=m" (*mem) + : "r" (with), "m" (*mem), "0" (cmp)); +#elif APR_SIZEOF_VOIDP == 8 + asm volatile ("lock; cmpxchgq %q2, %1" + : "=a" (prev), "=m" (*mem) + : "r" ((unsigned long)with), "m" (*mem), + "0" ((unsigned long)cmp)); +#else +#error APR_SIZEOF_VOIDP value not supported +#endif + return prev; +} + +#endif /* USE_ATOMICS_IA32 */ diff --git a/include/arch/unix/apr_arch_atomic.h b/include/arch/unix/apr_arch_atomic.h index f08165827..cadf3ff39 100644 --- a/include/arch/unix/apr_arch_atomic.h +++ b/include/arch/unix/apr_arch_atomic.h @@ -30,6 +30,8 @@ # define USE_ATOMICS_GENERIC #elif HAVE_ATOMIC_BUILTINS # define USE_ATOMICS_BUILTINS +#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) +# define USE_ATOMICS_IA32 #else # define USE_ATOMICS_GENERIC #endif |