Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 87 insertions, 0 deletions

diff --git a/base/shared_event.h b/base/shared_event.h
new file mode 100644
index 0000000..2ddebc0
--- /dev/null
+++ b/base/shared_event.h
@@ -0,0 +1,87 @@
+// 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_SHARED_EVENT__
+#define BASE_SHARED_EVENT__
+
+#include "base/process_util.h"
+
+class TimeDelta;
+
+typedef HANDLE SharedEventHandle;
+
+class SharedEvent {
+ public:
+  // Create a new SharedEvent.
+  SharedEvent() : event_handle_(NULL) { }
+
+  // Create a SharedEvent from an existing SharedEventHandle.  The new
+  // SharedEvent now owns the SharedEventHandle and will close it.
+  SharedEvent(SharedEventHandle event_handle) : event_handle_(event_handle) { }
+  ~SharedEvent();
+
+  // Create the SharedEvent.
+  bool Create(bool manual_reset, bool initial_state);
+
+  // Close the SharedEvent.
+  void Close();
+
+  // If |signaled| is true, set the signaled state, otherwise, set to nonsignaled.
+  // Returns false if we can't set the signaled state.
+  bool SetSignaledState(bool signaled);
+
+  // Returns true if the SharedEvent is signaled.
+  bool IsSignaled();
+
+  // Blocks until the event is signaled with a maximum wait time of |timeout|.
+  // Returns true if the object is signaled within the timeout.
+  bool WaitUntilSignaled(const TimeDelta& timeout);
+
+  // Blocks until the event is signaled.  Returns true if the object is
+  // signaled, otherwise an error occurred.
+  bool WaitForeverUntilSignaled();
+
+  // Get access to the underlying OS handle for this event.
+  SharedEventHandle handle() { return event_handle_; }
+
+  // Share this SharedEvent with |process|.  |new_handle| is an output
+  // parameter to receive the handle for use in |process|.  Returns false if we
+  // are unable to share the SharedEvent.
+  bool ShareToProcess(ProcessHandle process, SharedEventHandle *new_handle);
+
+  // The same as ShareToProcess followed by closing the event.
+  bool GiveToProcess(ProcessHandle process, SharedEventHandle *new_handle);
+
+ private:
+  SharedEventHandle event_handle_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(SharedEvent);
+};
+
+#endif  // BASE_SHARED_EVENT__