| // 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. |
| |
| #include "base/shared_event.h" |
| #include "base/logging.h" |
| #include "base/time.h" |
| |
| SharedEvent::~SharedEvent() { |
| Close(); |
| } |
| |
| bool SharedEvent::Create(bool manual_reset, bool initial_state) { |
| DCHECK(!event_handle_); |
| event_handle_ = CreateEvent(NULL /* security attributes */, manual_reset, |
| initial_state, NULL /* name */); |
| DCHECK(event_handle_); |
| return !!event_handle_; |
| } |
| |
| void SharedEvent::Close() { |
| if (event_handle_) { |
| BOOL rv = CloseHandle(event_handle_); |
| DCHECK(rv); |
| event_handle_ = NULL; |
| } |
| } |
| |
| bool SharedEvent::SetSignaledState(bool signaled) { |
| DCHECK(event_handle_); |
| BOOL rv; |
| if (signaled) { |
| rv = SetEvent(event_handle_); |
| } else { |
| rv = ResetEvent(event_handle_); |
| } |
| return rv ? true : false; |
| } |
| |
| bool SharedEvent::IsSignaled() { |
| DCHECK(event_handle_); |
| DWORD event_state = ::WaitForSingleObject(event_handle_, 0); |
| DCHECK(WAIT_OBJECT_0 == event_state || WAIT_TIMEOUT == event_state); |
| return event_state == WAIT_OBJECT_0; |
| } |
| |
| bool SharedEvent::WaitUntilSignaled(const TimeDelta& timeout) { |
| DCHECK(event_handle_); |
| DWORD event_state = ::WaitForSingleObject(event_handle_, |
| static_cast<DWORD>(timeout.InMillisecondsF())); |
| return event_state == WAIT_OBJECT_0; |
| } |
| |
| bool SharedEvent::WaitForeverUntilSignaled() { |
| DCHECK(event_handle_); |
| DWORD event_state = ::WaitForSingleObject(event_handle_, |
| INFINITE); |
| return event_state == WAIT_OBJECT_0; |
| } |
| |
| bool SharedEvent::ShareToProcess(ProcessHandle process, |
| SharedEventHandle *new_handle) { |
| DCHECK(event_handle_); |
| HANDLE event_handle_copy; |
| BOOL rv = DuplicateHandle(GetCurrentProcess(), event_handle_, process, |
| &event_handle_copy, 0, FALSE, DUPLICATE_SAME_ACCESS); |
| |
| if (rv) |
| *new_handle = event_handle_copy; |
| return rv ? true : false; |
| } |
| |
| bool SharedEvent::GiveToProcess(ProcessHandle process, |
| SharedEventHandle *new_handle) { |
| bool rv = ShareToProcess(process, new_handle); |
| if (rv) |
| Close(); |
| return rv; |
| } |