security/sandbox/chromium/base/synchronization/lock_impl.h@44a2da4a2ab2 (annotated)
security/sandbox/chromium/base/synchronization/lock_impl.h
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
| michael@0 | 1 | // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
| michael@0 | 6 | #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
| michael@0 | 7 | |
| michael@0 | 8 | #include "build/build_config.h" |
| michael@0 | 9 | |
| michael@0 | 10 | #if defined(OS_WIN) |
| michael@0 | 11 | #include <windows.h> |
| michael@0 | 12 | #elif defined(OS_POSIX) |
| michael@0 | 13 | #include <pthread.h> |
| michael@0 | 14 | #endif |
| michael@0 | 15 | |
| michael@0 | 16 | #include "base/base_export.h" |
| michael@0 | 17 | #include "base/basictypes.h" |
| michael@0 | 18 | |
| michael@0 | 19 | namespace base { |
| michael@0 | 20 | namespace internal { |
| michael@0 | 21 | |
| michael@0 | 22 | // This class implements the underlying platform-specific spin-lock mechanism |
| michael@0 | 23 | // used for the Lock class. Most users should not use LockImpl directly, but |
| michael@0 | 24 | // should instead use Lock. |
| michael@0 | 25 | class BASE_EXPORT LockImpl { |
| michael@0 | 26 | public: |
| michael@0 | 27 | #if defined(OS_WIN) |
| michael@0 | 28 | typedef CRITICAL_SECTION NativeHandle; |
| michael@0 | 29 | #elif defined(OS_POSIX) |
| michael@0 | 30 | typedef pthread_mutex_t NativeHandle; |
| michael@0 | 31 | #endif |
| michael@0 | 32 | |
| michael@0 | 33 | LockImpl(); |
| michael@0 | 34 | ~LockImpl(); |
| michael@0 | 35 | |
| michael@0 | 36 | // If the lock is not held, take it and return true. If the lock is already |
| michael@0 | 37 | // held by something else, immediately return false. |
| michael@0 | 38 | bool Try(); |
| michael@0 | 39 | |
| michael@0 | 40 | // Take the lock, blocking until it is available if necessary. |
| michael@0 | 41 | void Lock(); |
| michael@0 | 42 | |
| michael@0 | 43 | // Release the lock. This must only be called by the lock's holder: after |
| michael@0 | 44 | // a successful call to Try, or a call to Lock. |
| michael@0 | 45 | void Unlock(); |
| michael@0 | 46 | |
| michael@0 | 47 | // Return the native underlying lock. |
| michael@0 | 48 | // TODO(awalker): refactor lock and condition variables so that this is |
| michael@0 | 49 | // unnecessary. |
| michael@0 | 50 | NativeHandle* native_handle() { return &native_handle_; } |
| michael@0 | 51 | |
| michael@0 | 52 | private: |
| michael@0 | 53 | NativeHandle native_handle_; |
| michael@0 | 54 | |
| michael@0 | 55 | DISALLOW_COPY_AND_ASSIGN(LockImpl); |
| michael@0 | 56 | }; |
| michael@0 | 57 | |
| michael@0 | 58 | } // namespace internal |
| michael@0 | 59 | } // namespace base |
| michael@0 | 60 | |
| michael@0 | 61 | #endif // BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
