Adds new class AtExitManager which manages the dtors of all singletons.

- Previously this job was done by the CRT's atexit() which runs later than we want and under the loader lock.
- Had to modify most main() functions for the testing executables so we don't trigger leak detectors.



git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 80 insertions, 0 deletions

diff --git a/base/at_exit.h b/base/at_exit.h
new file mode 100644
index 0000000..8b9f946
--- /dev/null
+++ b/base/at_exit.h
@@ -0,0 +1,80 @@
+// 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.
+//    * 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.
+
+#ifndef BASE_AT_EXIT_H__
+#define BASE_AT_EXIT_H__
+
+#include <stack>
+
+#include "base/basictypes.h"
+#include "base/lock.h"
+
+namespace base {
+
+typedef void (*AtExitCallbackType)();
+
+// This class provides a facility similar to the CRT atexit(), except that
+// we control when the callbacks are executed. Under Windows for a DLL they
+// happen at a really bad time and under the loader lock. This facility is
+// mostly used by base::Singleton.
+//
+// The usage is simple. Early in the main() or WinMain() scope create an
+// AtExitManager object on the stack:
+// int main(...) {
+//    base::AtExitManager exit_manager;
+//   
+// }
+// When the exit_manager object goes out of scope, all the registered
+// callbacks and singleton destructors will be called.
+
+class AtExitManager {
+ public:
+  AtExitManager();
+
+  // The dtor calls all the registered callbacks. Do not try to register more
+  // callbacks after this point.
+  ~AtExitManager();
+
+  // Registers the specified function to be called at exit. The prototype of
+  // the callback function is void func().
+  static void RegisterCallback(AtExitCallbackType func);
+
+  // Calls the functions registered with RegisterCallback in LIFO order. It
+  // is possible to register new callbacks after calling this function.
+  static void ProcessCallbacksNow();
+
+ private:
+  Lock lock_;
+  std::stack<base::AtExitCallbackType> atexit_queue_;
+  DISALLOW_EVIL_CONSTRUCTORS(AtExitManager);
+};
+
+}  // namespace base
+
+#endif // BASE_AT_EXIT_H__