ASF Bugzilla – Attachment 20438 Details for
Bug 42806
apr_atomic problems
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[patch]
compiler provided atomic builtins
apr-atomic-builtins.patch (text/plain), 4.08 KB, created by
Davi Arnaut
on 2007-07-03 18:23:06 UTC
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Description:
compiler provided atomic builtins
Filename:
MIME Type:
Creator:
Davi Arnaut
Created:
2007-07-03 18:23:06 UTC
Size:
4.08 KB
patch
obsolete
>Index: apr/atomic/unix/builtins.c >=================================================================== >--- /dev/null >+++ apr/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 */ >Index: apr/configure.in >=================================================================== >--- apr.orig/configure.in >+++ apr/configure.in >@@ -350,6 +350,48 @@ case "$host:$CC" in > ;; > esac > >+AC_CACHE_CHECK([whether the compiler provides atomic builtins], [atomic_builtins], >+[AC_TRY_RUN([ >+int main() >+{ >+ unsigned long val = 1010, tmp, *mem = &val; >+ >+ if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020) >+ return 1; >+ >+ tmp = val; >+ >+ if (__sync_fetch_and_sub(mem, 1010) != tmp || val != 1010) >+ return 1; >+ >+ if (__sync_sub_and_fetch(&val, 1010) != 0 || val != 0) >+ return 1; >+ >+ tmp = 3030; >+ >+ if (__sync_val_compare_and_swap(mem, 0, tmp) != 0 || val != tmp) >+ return 1; >+ >+ if (__sync_lock_test_and_set(&val, 4040) != 3030) >+ return 1; >+ >+ mem = &tmp; >+ >+ if (__sync_val_compare_and_swap(&mem, &tmp, &val) != &tmp) >+ return 1; >+ >+ __sync_synchronize(); >+ >+ if (mem != &val) >+ return 1; >+ >+ return 0; >+}], [atomic_builtins=yes], [atomic_builtins=no], [atomic_builtins=no])]) >+ >+if test "$atomic_builtins" = "yes"; then >+ AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins]) >+fi >+ > dnl Check the depend program we can use > APR_CHECK_DEPEND > >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 >@@ -28,6 +28,8 @@ > /* force use of generic atomics if building e.g. with -std=c89, which > * doesn't allow inline asm */ > # define USE_ATOMICS_GENERIC >+#elif HAVE_ATOMIC_BUILTINS >+# define USE_ATOMICS_BUILTINS > #else > # define USE_ATOMICS_GENERIC > #endif
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