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 | #ifndef BASE_SHARED_EVENT__ |
| 6 | #define BASE_SHARED_EVENT__ |
| 7 | |
| 8 | #include "base/process_util.h" |
| 9 | |
| 10 | class TimeDelta; |
| 11 | |
| 12 | typedef HANDLE SharedEventHandle; |
| 13 | |
| 14 | class SharedEvent { |
| 15 | public: |
| 16 | // Create a new SharedEvent. |
| 17 | SharedEvent() : event_handle_(NULL) { } |
| 18 | |
| 19 | // Create a SharedEvent from an existing SharedEventHandle. The new |
| 20 | // SharedEvent now owns the SharedEventHandle and will close it. |
| 21 | SharedEvent(SharedEventHandle event_handle) : event_handle_(event_handle) { } |
| 22 | ~SharedEvent(); |
| 23 | |
| 24 | // Create the SharedEvent. |
| 25 | bool Create(bool manual_reset, bool initial_state); |
| 26 | |
| 27 | // Close the SharedEvent. |
| 28 | void Close(); |
| 29 | |
| 30 | // If |signaled| is true, set the signaled state, otherwise, set to nonsignaled. |
| 31 | // Returns false if we can't set the signaled state. |
| 32 | bool SetSignaledState(bool signaled); |
| 33 | |
| 34 | // Returns true if the SharedEvent is signaled. |
| 35 | bool IsSignaled(); |
| 36 | |
| 37 | // Blocks until the event is signaled with a maximum wait time of |timeout|. |
| 38 | // Returns true if the object is signaled within the timeout. |
| 39 | bool WaitUntilSignaled(const TimeDelta& timeout); |
| 40 | |
| 41 | // Blocks until the event is signaled. Returns true if the object is |
| 42 | // signaled, otherwise an error occurred. |
| 43 | bool WaitForeverUntilSignaled(); |
| 44 | |
| 45 | // Get access to the underlying OS handle for this event. |
| 46 | SharedEventHandle handle() { return event_handle_; } |
| 47 | |
| 48 | // Share this SharedEvent with |process|. |new_handle| is an output |
| 49 | // parameter to receive the handle for use in |process|. Returns false if we |
| 50 | // are unable to share the SharedEvent. |
| 51 | bool ShareToProcess(ProcessHandle process, SharedEventHandle *new_handle); |
| 52 | |
| 53 | // The same as ShareToProcess followed by closing the event. |
| 54 | bool GiveToProcess(ProcessHandle process, SharedEventHandle *new_handle); |
| 55 | |
| 56 | private: |
| 57 | SharedEventHandle event_handle_; |
| 58 | |
| 59 | DISALLOW_EVIL_CONSTRUCTORS(SharedEvent); |
| 60 | }; |
| 61 | |
| 62 | #endif // BASE_SHARED_EVENT__ |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 63 | |