Switch NaCl code to use GCC intrinsics for atomic ops.

src/include/atomic_ops.h

 /*
  * Copyright 2008, Google Inc.
  * 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.
@@ skipping 23 matching lines @@
 #define NATIVE_CLIENT_SRC_INCLUDE_ATOMIC_OPS_H_ 1
 
 /* ------------------------------------------------------------------------
  * Include the platform specific implementations of the types
  * and operations listed below.
  * ------------------------------------------------------------------------
  */
 
 #include "native_client/src/include/nacl_base.h"
 
-#ifdef __native_client__
+#if defined(__native_client__) || defined(NACL_LINUX)

[Mark Seaborn, 2012/09/15 02:53:51]

This should be "#if defined(__native_client__) || NACL_LINUX".  NACL_LINUX is
always defined, as either 0 or 1.

[petarj, 2012/09/15 23:13:17]

Done.

 #include "native_client/src/include/nacl/atomic_ops.h"

[Mark Seaborn, 2012/09/15 02:53:51]

Could you rename "nacl/atomic_ops.h" to "gcc/atomic_ops.h" to reflect that it's
not just used in NaCl untrusted code?

[petarj, 2012/09/15 23:13:17]

Done.

 #elif NACL_OSX
 #include "native_client/src/include/osx/atomic_ops_osx.h"
-#elif NACL_LINUX
-
-#if NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86
-#include "native_client/src/include/linux/x86/atomic_ops.h"
-#elif NACL_ARCH(NACL_BUILD_ARCH) == NACL_arm
-#include "native_client/src/include/linux/arm/atomic_ops.h"
-#else
-#error Unknown platform!
-#endif
-
 #elif NACL_WINDOWS
 #include "native_client/src/include/win/atomic_ops_win32.h"
 #else
 #error You need to implement atomic operations for this architecture
 #endif
 
 /* ------------------------------------------------------------------------
  * Interface provided by this module
  * ------------------------------------------------------------------------
  */
@@ skipping 30 matching lines @@
 
 
 /*   Atomically increment *ptr by "increment".  Returns the new value of
  *   *ptr with the increment applied.  This routine implies no memory
  *   barriers.
  */
 static INLINE Atomic32
 AtomicIncrement(volatile Atomic32* ptr, Atomic32 increment);
 
 #endif  /* NATIVE_CLIENT_SRC_INCLUDE_ATOMIC_OPS_H_ */