Rollback of r11015, r11014, r11011, r11010 in trunk branch.

src/once.cc

Index: src/once.cc
diff --git a/src/once.cc b/src/once.cc
deleted file mode 100644
index 37fe369fb67a272ab121834968abbabdb78bd787..0000000000000000000000000000000000000000
--- a/src/once.cc
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2012 the V8 project authors. 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 Google Inc. 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE 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 "once.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <sched.h>
-#endif
-
-#include "atomicops.h"
-#include "checks.h"
-
-namespace v8 {
-namespace internal {
-
-void CallOnceImpl(OnceType* once, PointerArgFunction init_func, void* arg) {
-  AtomicWord state = Acquire_Load(once);
-  // Fast path. The provided function was already executed.
-  if (state == ONCE_STATE_DONE) {
-    return;
-  }
-
-  // The function execution did not complete yet. The once object can be in one
-  // of the two following states:
-  //   - UNINITIALIZED: We are the first thread calling this function.
-  //   - EXECUTING_FUNCTION: Another thread is already executing the function.
-  //
-  // First, try to change the state from UNINITIALIZED to EXECUTING_FUNCTION
-  // atomically.
-  state = Acquire_CompareAndSwap(
-      once, ONCE_STATE_UNINITIALIZED, ONCE_STATE_EXECUTING_FUNCTION);
-  if (state == ONCE_STATE_UNINITIALIZED) {
-    // We are the first thread to call this function, so we have to call the
-    // function.
-    init_func(arg);
-    Release_Store(once, ONCE_STATE_DONE);
-  } else {
-    // Another thread has already started executing the function. We need to
-    // wait until it completes the initialization.
-    while (state == ONCE_STATE_EXECUTING_FUNCTION) {
-#ifdef _WIN32
-      ::Sleep(0);
-#else
-      sched_yield();
-#endif
-      state = Acquire_Load(once);
-    }
-  }
-}
-
-} }  // namespace v8::internal