1 files changed, 68 insertions, 0 deletions
diff --git a/src/atomic.c b/src/atomic.c
new file mode 100644
index 0000000..cfe1067
--- /dev/null
+++ b/src/atomic.c
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+/*
+ * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *    * Neither the name of The Linux Foundation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "AEEatomic.h"
+
+uint32 atomic_Add(uint32 * volatile puDest, int nAdd) {
+   uint32 previous;
+   uint32 current;
+   do {
+      current = *puDest;
+      previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
+   } while(previous != current);
+   return (current + nAdd);
+}
+
+uint32 atomic_Exchange(uint32* volatile puDest, uint32 uVal) {
+   uint32 previous;
+   uint32 current;
+   do {
+      current = *puDest;
+      previous = atomic_CompareAndExchange(puDest, uVal, current);
+   } while(previous != current);
+   return previous;
+}
+
+uint32 atomic_CompareOrAdd(uint32* volatile puDest, uint32 uCompare, int nAdd) {
+   uint32 previous;
+   uint32 current;
+   uint32 result;
+   do {
+      current = *puDest;
+      previous = current;
+      result = current;
+      if(current != uCompare) {
+         previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
+         if(previous == current) {
+            result = current + nAdd;
+         }
+      }
+   } while(previous != current);
+   return result;
+}
+