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-rw-r--r--atomic/unix/ia32.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/atomic/unix/ia32.c b/atomic/unix/ia32.c
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+/* 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)
+{
+#if defined (NEED_ATOMICS_GENERIC64)
+ return apr__atomic_generic64_init(p);
+#else
+ return APR_SUCCESS;
+#endif
+}
+
+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 ("xchgl %0, %1"
+ : "=r" (prev), "+m" (*mem)
+ : "0" (prev));
+ 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;
+}
+
+APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
+{
+ void *prev;
+#if APR_SIZEOF_VOIDP == 4
+ asm volatile ("xchgl %2, %1"
+ : "=a" (prev), "+m" (*mem)
+ : "0" (with));
+#elif APR_SIZEOF_VOIDP == 8
+ asm volatile ("xchgq %q2, %1"
+ : "=a" (prev), "+m" (*mem)
+ : "0" (with));
+#else
+#error APR_SIZEOF_VOIDP value not supported
+#endif
+ return prev;
+}
+
+#endif /* USE_ATOMICS_IA32 */