libatomic_ops support

auto/lib/conf

diff --git a/auto/lib/conf b/auto/lib/conf
index edb15bc..60e891b 100644
--- a/auto/lib/conf
+++ b/auto/lib/conf
@@ -70,6 +70,11 @@
 if [ $HTTP_GEOIP = YES ]; then
     . auto/lib/geoip/conf
 fi
+
 if [ $NGX_GOOGLE_PERFTOOLS = YES ]; then
     . auto/lib/google-perftools/conf
 fi
+
+if [ $NGX_LIBATOMIC != NO ]; then
+    . auto/lib/libatomic/conf
+fi

auto/lib/libatomic/conf

diff --git a/auto/lib/libatomic/conf b/auto/lib/libatomic/conf
new file mode 100644
index 0000000..a06ab1a
--- /dev/null
+++ b/auto/lib/libatomic/conf
@@ -0,0 +1,38 @@
+
+# Copyright (C) Igor Sysoev
+
+
+if [ $NGX_LIBATOMIC != YES ]; then
+
+    have=NGX_HAVE_LIBATOMIC . auto/have
+    CORE_INCS="$CORE_INCS $NGX_LIBATOMIC/src"
+    LINK_DEPS="$LINK_DEPS $NGX_LIBATOMIC/src/libatomic_ops.a"
+    CORE_LIBS="$CORE_LIBS $NGX_LIBATOMIC/src/libatomic_ops.a"
+
+else
+
+    ngx_feature="atomic_ops library"
+    ngx_feature_name=NGX_HAVE_LIBATOMIC
+    ngx_feature_run=no
+    ngx_feature_incs="#include <atomic_ops.h>"
+    ngx_feature_path=
+    ngx_feature_libs="-latomic_ops"
+    ngx_feature_test="AO_t *n;
+                      AO_compare_and_swap(n, 0, 1);
+                      AO_fetch_and_add(n, 1);
+                      AO_nop();"
+
+    . auto/feature
+
+    if [ $ngx_found = yes ]; then
+        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+    else
+
+cat << END
+
+$0: error: libatomic_ops library was not found.
+
+END
+        exit 1
+    fi
+fi

auto/lib/libatomic/make

diff --git a/auto/lib/libatomic/make b/auto/lib/libatomic/make
new file mode 100644
index 0000000..e1672e3
--- /dev/null
+++ b/auto/lib/libatomic/make
@@ -0,0 +1,13 @@
+
+# Copyright (C) Igor Sysoev
+
+
+    cat << END                                            >> $NGX_MAKEFILE
+
+$NGX_LIBATOMIC/src/libatomic_ops.a:	$NGX_LIBATOMIC/Makefile
+	cd $NGX_LIBATOMIC && make
+
+$NGX_LIBATOMIC/Makefile:	$NGX_MAKEFILE
+	cd $NGX_LIBATOMIC && ./configure
+
+END

auto/lib/make

diff --git a/auto/lib/make b/auto/lib/make
index 170311c..f22767e 100644
--- a/auto/lib/make
+++ b/auto/lib/make
@@ -22,6 +22,10 @@
     . auto/lib/zlib/make
 fi
 
+if [ $NGX_LIBATOMIC != NO -a $NGX_LIBATOMIC != YES ]; then
+    . auto/lib/libatomic/make
+fi
+
 if [ $USE_PERL = YES ]; then
     . auto/lib/perl/make
 fi