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// 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__
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