util/u_atomic: Add a simple test.

It was much easier for me to verify things build and run as expected
with this simple test, than building and testing whole Mesa.

With scons the test can be build and run merely by doing:

  scons u_atomic_test

Building the test with autotools is left as a future exercise.

Reviewed-by: Matt Turner <mattst88@gmail.com>

src/util/SConscript

@@ -36,3 +36,12 @@ mesautil = env.ConvenienceLibrary(
 
 env.Alias('mesautil', mesautil)
 Export('mesautil')
+
+
+# http://www.scons.org/wiki/UnitTests
+u_atomic_test = env.Program(
+    target = 'u_atomic_test',
+    source = ['u_atomic_test.c'],
+)
+alias = env.Alias("u_atomic_test", u_atomic_test, u_atomic_test[0].abspath)
+AlwaysBuild(alias)

src/util/u_atomic_test.c

@@ -0,0 +1,137 @@
+/**************************************************************************
+ *
+ * Copyright 2014 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+/* Force assertions, even on debug builds. */
+#undef NDEBUG
+
+
+#include <stdint.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "u_atomic.h"
+
+
+#define test_atomic_cmpxchg(type, ones) \
+   static void test_atomic_cmpxchg_##type (void) { \
+      type v, r; \
+      \
+      p_atomic_set(&v, ones); \
+      assert(v == ones && "p_atomic_set"); \
+      \
+      r = p_atomic_read(&v); \
+      assert(r == ones && "p_atomic_read"); \
+      \
+      v = ones; \
+      r = p_atomic_cmpxchg(&v, 0, 1); \
+      assert(v == ones && "p_atomic_cmpxchg"); \
+      assert(r == ones && "p_atomic_cmpxchg"); \
+      r = p_atomic_cmpxchg(&v, ones, 0); \
+      assert(v == 0 && "p_atomic_cmpxchg"); \
+      assert(r == ones && "p_atomic_cmpxchg"); \
+      \
+      (void) r; \
+   }
+
+
+#define test_atomic(type, ones) \
+   test_atomic_cmpxchg(type, ones) \
+   \
+   static void test_atomic_##type (void) { \
+      type v, r; \
+      bool b; \
+      \
+      test_atomic_cmpxchg_##type(); \
+      \
+      v = 2; \
+      b = p_atomic_dec_zero(&v); \
+      assert(v == 1 && "p_atomic_dec_zero"); \
+      assert(b == false && "p_atomic_dec_zero"); \
+      b = p_atomic_dec_zero(&v); \
+      assert(v == 0 && "p_atomic_dec_zero"); \
+      assert(b == true && "p_atomic_dec_zero"); \
+      b = p_atomic_dec_zero(&v); \
+      assert(v == ones && "p_atomic_dec_zero"); \
+      assert(b == false && "p_atomic_dec_zero"); \
+      \
+      v = ones; \
+      p_atomic_inc(&v); \
+      assert(v == 0 && "p_atomic_inc"); \
+      \
+      v = ones; \
+      r = p_atomic_inc_return(&v); \
+      assert(v == 0 && "p_atomic_inc_return"); \
+      assert(r == v && "p_atomic_inc_return"); \
+      \
+      v = 0; \
+      p_atomic_dec(&v); \
+      assert(v == ones && "p_atomic_dec"); \
+      \
+      v = 0; \
+      r = p_atomic_dec_return(&v); \
+      assert(v == ones && "p_atomic_dec_return"); \
+      assert(r == v && "p_atomic_dec_return"); \
+      \
+      (void) r; \
+      (void) b; \
+   }
+
+
+test_atomic(int, -1)
+test_atomic(unsigned, ~0U)
+
+test_atomic(int16_t, INT16_C(-1))
+test_atomic(uint16_t, UINT16_C(0xffff))
+test_atomic(int32_t, INT32_C(-1))
+test_atomic(uint32_t, UINT32_C(0xffffffff))
+test_atomic(int64_t, INT64_C(-1))
+test_atomic(uint64_t, UINT64_C(0xffffffffffffffff))
+
+test_atomic_cmpxchg(int8_t, INT8_C(-1))
+test_atomic_cmpxchg(uint8_t, UINT8_C(0xff))
+test_atomic_cmpxchg(bool, true)
+
+int
+main()
+{
+   test_atomic_int();
+   test_atomic_unsigned();
+
+   test_atomic_int16_t();
+   test_atomic_uint16_t();
+   test_atomic_int32_t();
+   test_atomic_uint32_t();
+   test_atomic_int64_t();
+   test_atomic_uint64_t();
+
+   test_atomic_cmpxchg_int8_t();
+   test_atomic_cmpxchg_uint8_t();
+   test_atomic_cmpxchg_bool();
+
+   return 0;
+}