svn commit: r1103246 - in /activemq/activemq-cpp/trunk/activemq-cpp: configure.ac m4/check_atomics.m4

[ta...@apache.org]

Author: tabish
Date: Sat May 14 22:42:18 2011
New Revision: 1103246

URL: http://svn.apache.org/viewvc?rev=1103246&view=rev
Log:
Detect compiler built-in Atomic operations

Added:
    activemq/activemq-cpp/trunk/activemq-cpp/m4/check_atomics.m4   (with props)
Modified:
    activemq/activemq-cpp/trunk/activemq-cpp/configure.ac

Modified: activemq/activemq-cpp/trunk/activemq-cpp/configure.ac
URL: http://svn.apache.org/viewvc/activemq/activemq-cpp/trunk/activemq-cpp/configure.ac?rev=1103246&r1=1103245&r2=1103246&view=diff
==============================================================================
--- activemq/activemq-cpp/trunk/activemq-cpp/configure.ac (original)
+++ activemq/activemq-cpp/trunk/activemq-cpp/configure.ac Sat May 14 22:42:18 2011
@@ -178,6 +178,9 @@ PLAT_LIBS=
 # Detect the presence of pthreads and the correct linker settings.
 DECAF_CHECK_PTHREADS()
 
+# Detect the presence of atomic operations.
+DECAF_CHECK_ATOMICS()
+
 case "${host_os}" in
 
   *darwin* ) ## Mac OS X configuration

Added: activemq/activemq-cpp/trunk/activemq-cpp/m4/check_atomics.m4
URL: http://svn.apache.org/viewvc/activemq/activemq-cpp/trunk/activemq-cpp/m4/check_atomics.m4?rev=1103246&view=auto
==============================================================================
--- activemq/activemq-cpp/trunk/activemq-cpp/m4/check_atomics.m4 (added)
+++ activemq/activemq-cpp/trunk/activemq-cpp/m4/check_atomics.m4 Sat May 14 22:42:18 2011
@@ -0,0 +1,86 @@
+dnl -------------------------------------------------------- -*- autoconf -*-
+dnl Licensed to the Apache Software Foundation (ASF) under one or more
+dnl contributor license agreements.  See the NOTICE file distributed with
+dnl this work for additional information regarding copyright ownership.
+dnl The ASF licenses this file to You under the Apache License, Version 2.0
+dnl (the "License"); you may not use this file except in compliance with
+dnl the License.  You may obtain a copy of the License at
+dnl
+dnl     http://www.apache.org/licenses/LICENSE-2.0
+dnl
+dnl Unless required by applicable law or agreed to in writing, software
+dnl distributed under the License is distributed on an "AS IS" BASIS,
+dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+dnl See the License for the specific language governing permissions and
+dnl limitations under the License.
+
+dnl
+dnl check_atomics.m4 - checks support for atomics and determines what the
+dnl                    features of the installed library are on this platform.
+dnl
+dnl This macro checks for the presence of the atomics operations.  If found then
+dnl the library is tested to determine what features it supports, or lacks and
+dnl configuration options are set to indicate this information.
+dnl
+
+dnl
+dnl DECAF_CHECK_FOR_ATOMIC_BUILTINS in GCC
+dnl
+AC_DEFUN([DECAF_CHECK_FOR_ATOMIC_BUILTINS], [
+
+    AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_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;
+    }], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], [ap_cv_atomic_builtins=no])])
+
+    if test "$ap_cv_atomic_builtins" = "yes"; then
+        AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins])
+    fi
+
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Checks for atomic operations support and the various features that are
+dnl needed in order to build the DECAF Code that uses atomics provided by
+dnl the compiler or OS rather than using Mutex based atomic operations.
+dnl ---------------------------------------------------------------------------
+
+AC_DEFUN([DECAF_CHECK_ATOMICS], [
+
+    dnl Attempts to enable atomic builtins compilation on this platform.
+    DECAF_CHECK_FOR_ATOMIC_BUILTINS
+
+])

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