Initial version.

auto/atomic

@@ -0,0 +1,114 @@
+
+# Copyright (C) Igor Sysoev
+# Copyright (C) NGINX, Inc.
+
+
+# GCC 4.1+ builtin atomic operations.
+
+nxt_feature="GCC builtin atomic operations"
+nxt_feature_name=NXT_HAVE_GCC_ATOMIC
+nxt_feature_run=yes
+nxt_feature_incs=
+nxt_feature_libs=
+nxt_feature_test="int main() {
+                      long  n = 0;
+
+                      if (!__sync_bool_compare_and_swap(&n, 0, 3))
+                          return 1;
+                      if (__sync_fetch_and_add(&n, 1) != 3)
+                          return 1;
+                      if (__sync_lock_test_and_set(&n, 5) != 4)
+                          return 1;
+                      if (n != 5)
+                          return 1;
+                      __sync_lock_release(&n);
+                      if (n != 0)
+                          return 1;
+                      return 0;
+                  }"
+. auto/feature
+
+
+# Solaris 10 builtin atomic operations.
+
+if [ $nxt_found = no ]; then
+
+    nxt_feature="Solaris builtin atomic operations"
+    nxt_feature_name=NXT_HAVE_SOLARIS_ATOMIC
+    nxt_feature_run=yes
+    nxt_feature_incs=
+    nxt_feature_libs=
+    nxt_feature_test="#include <atomic.h>
+
+                      int main() {
+                          ulong_t  n = 0;
+
+                          if (atomic_cas_ulong(&n, 0, 3) != 0)
+                              return 1;
+                          if (atomic_add_long_nv(&n, 1) != 4)
+                              return 1;
+                          if (atomic_swap_ulong(&n, 5) != 4)
+                              return 1;
+                          if (n != 5)
+                              return 1;
+                          return 0;
+                      }"
+    . auto/feature
+fi
+
+
+# AIX xlC builtin atomic operations.
+
+if [ $nxt_found = no ]; then
+
+    if [ $NXT_64BIT = 1 ]; then
+        nxt_feature_test="int main() {
+                              long  n = 0;
+                              long  o = 0;
+
+                              if (!__compare_and_swaplp(&n, &o, 3))
+                                  return 1;
+                              if (__fetch_and_addlp(&n, 1) != 3)
+                                  return 1;
+                              if (__fetch_and_swaplp(&n, 5) != 4)
+                                  return 1;
+                              if (n != 5)
+                                  return 1;
+                              __isync();
+                              __lwsync();
+                              return 0;
+                          }"
+    else
+        nxt_feature_test="int main() {
+                              int  n = 0;
+                              int  o = 0;
+
+                              if (!__compare_and_swap(&n, &o, 3))
+                                  return 1;
+                              if (__fetch_and_add(&n, 1) != 3)
+                                  return 1;
+                              if (__fetch_and_swap(&n, 5) != 4)
+                                  return 1;
+                              if (n != 5)
+                                  return 1;
+                              __isync();
+                              __lwsync();
+                              return 0;
+                          }"
+    fi
+
+    nxt_feature="xlC builtin atomic operations"
+    nxt_feature_name=NXT_HAVE_XLC_ATOMIC
+    nxt_feature_run=yes
+    nxt_feature_incs=
+    nxt_feature_libs=
+    . auto/feature
+fi
+
+
+if [ $nxt_found = no ]; then
+    $echo
+    $echo $0: error: no atomic operations found.
+    $echo
+    exit 1;
+fi