license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 1 | // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 4 | |
| 5 | #include "base/shared_event.h" |
| 6 | #include "base/logging.h" |
| 7 | #include "base/time.h" |
| 8 | |
| 9 | SharedEvent::~SharedEvent() { |
| 10 | Close(); |
| 11 | } |
| 12 | |
| 13 | bool SharedEvent::Create(bool manual_reset, bool initial_state) { |
| 14 | DCHECK(!event_handle_); |
| 15 | event_handle_ = CreateEvent(NULL /* security attributes */, manual_reset, |
| 16 | initial_state, NULL /* name */); |
| 17 | DCHECK(event_handle_); |
| 18 | return !!event_handle_; |
| 19 | } |
| 20 | |
| 21 | void SharedEvent::Close() { |
| 22 | if (event_handle_) { |
| 23 | BOOL rv = CloseHandle(event_handle_); |
| 24 | DCHECK(rv); |
| 25 | event_handle_ = NULL; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | bool SharedEvent::SetSignaledState(bool signaled) { |
| 30 | DCHECK(event_handle_); |
| 31 | BOOL rv; |
| 32 | if (signaled) { |
| 33 | rv = SetEvent(event_handle_); |
| 34 | } else { |
| 35 | rv = ResetEvent(event_handle_); |
| 36 | } |
| 37 | return rv ? true : false; |
| 38 | } |
| 39 | |
| 40 | bool SharedEvent::IsSignaled() { |
| 41 | DCHECK(event_handle_); |
| 42 | DWORD event_state = ::WaitForSingleObject(event_handle_, 0); |
| 43 | DCHECK(WAIT_OBJECT_0 == event_state || WAIT_TIMEOUT == event_state); |
| 44 | return event_state == WAIT_OBJECT_0; |
| 45 | } |
| 46 | |
| 47 | bool SharedEvent::WaitUntilSignaled(const TimeDelta& timeout) { |
| 48 | DCHECK(event_handle_); |
| 49 | DWORD event_state = ::WaitForSingleObject(event_handle_, |
| 50 | static_cast<DWORD>(timeout.InMillisecondsF())); |
| 51 | return event_state == WAIT_OBJECT_0; |
| 52 | } |
| 53 | |
| 54 | bool SharedEvent::WaitForeverUntilSignaled() { |
| 55 | DCHECK(event_handle_); |
| 56 | DWORD event_state = ::WaitForSingleObject(event_handle_, |
| 57 | INFINITE); |
| 58 | return event_state == WAIT_OBJECT_0; |
| 59 | } |
| 60 | |
| 61 | bool SharedEvent::ShareToProcess(ProcessHandle process, |
| 62 | SharedEventHandle *new_handle) { |
| 63 | DCHECK(event_handle_); |
| 64 | HANDLE event_handle_copy; |
| 65 | BOOL rv = DuplicateHandle(GetCurrentProcess(), event_handle_, process, |
| 66 | &event_handle_copy, 0, FALSE, DUPLICATE_SAME_ACCESS); |
| 67 | |
| 68 | if (rv) |
| 69 | *new_handle = event_handle_copy; |
| 70 | return rv ? true : false; |
| 71 | } |
| 72 | |
| 73 | bool SharedEvent::GiveToProcess(ProcessHandle process, |
| 74 | SharedEventHandle *new_handle) { |
| 75 | bool rv = ShareToProcess(process, new_handle); |
| 76 | if (rv) |
| 77 | Close(); |
| 78 | return rv; |
| 79 | } |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 80 | |