Attachment 20439 Details for Bug 42806 – ia32 atomics

[patch] ia32 atomics

apr-atomic-ia32.patch (text/plain), 3.92 KB, created by Davi Arnaut on 2007-07-03 18:24:40 UTC

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Creator: Davi Arnaut

Created: 2007-07-03 18:24:40 UTC

Size: 3.92 KB

patch

obsolete

>Index: apr/include/arch/unix/apr_arch_atomic.h
>===================================================================
>--- apr.orig/include/arch/unix/apr_arch_atomic.h
>+++ apr/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
>Index: apr/atomic/unix/ia32.c
>===================================================================
>--- /dev/null
>+++ apr/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 */

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