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comparison: ipc/chromium/src/base/lock_impl.h
ipc/chromium/src/base/lock_impl.h
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| 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. | |
| 4 | |
| 5 #ifndef BASE_LOCK_IMPL_H_ | |
| 6 #define BASE_LOCK_IMPL_H_ | |
| 7 | |
| 8 #include "build/build_config.h" | |
| 9 | |
| 10 #if defined(OS_WIN) | |
| 11 #include <windows.h> | |
| 12 #elif defined(OS_POSIX) | |
| 13 #include <pthread.h> | |
| 14 #endif | |
| 15 | |
| 16 #include "base/basictypes.h" | |
| 17 #include "base/platform_thread.h" | |
| 18 | |
| 19 // This class implements the underlying platform-specific spin-lock mechanism | |
| 20 // used for the Lock class. Most users should not use LockImpl directly, but | |
| 21 // should instead use Lock. | |
| 22 class LockImpl { | |
| 23 public: | |
| 24 #if defined(OS_WIN) | |
| 25 typedef CRITICAL_SECTION OSLockType; | |
| 26 #elif defined(OS_POSIX) | |
| 27 typedef pthread_mutex_t OSLockType; | |
| 28 #endif | |
| 29 | |
| 30 LockImpl(); | |
| 31 ~LockImpl(); | |
| 32 | |
| 33 // If the lock is not held, take it and return true. If the lock is already | |
| 34 // held by something else, immediately return false. | |
| 35 bool Try(); | |
| 36 | |
| 37 // Take the lock, blocking until it is available if necessary. | |
| 38 void Lock(); | |
| 39 | |
| 40 // Release the lock. This must only be called by the lock's holder: after | |
| 41 // a successful call to Try, or a call to Lock. | |
| 42 void Unlock(); | |
| 43 | |
| 44 // Debug-only method that will DCHECK() if the lock is not acquired by the | |
| 45 // current thread. In non-debug builds, no check is performed. | |
| 46 // Because linux and mac condition variables modify the underlyning lock | |
| 47 // through the os_lock() method, runtime assertions can not be done on those | |
| 48 // builds. | |
| 49 #if defined(NDEBUG) || !defined(OS_WIN) | |
| 50 void AssertAcquired() const {} | |
| 51 #else | |
| 52 void AssertAcquired() const; | |
| 53 #endif | |
| 54 | |
| 55 // Return the native underlying lock. Not supported for Windows builds. | |
| 56 // TODO(awalker): refactor lock and condition variables so that this is | |
| 57 // unnecessary. | |
| 58 #if !defined(OS_WIN) | |
| 59 OSLockType* os_lock() { return &os_lock_; } | |
| 60 #endif | |
| 61 | |
| 62 private: | |
| 63 OSLockType os_lock_; | |
| 64 | |
| 65 #if !defined(NDEBUG) && defined(OS_WIN) | |
| 66 // All private data is implicitly protected by lock_. | |
| 67 // Be VERY careful to only access members under that lock. | |
| 68 PlatformThreadId owning_thread_id_; | |
| 69 int32_t recursion_count_shadow_; | |
| 70 bool recursion_used_; // Allow debugging to continued after a DCHECK(). | |
| 71 #endif // NDEBUG | |
| 72 | |
| 73 DISALLOW_COPY_AND_ASSIGN(LockImpl); | |
| 74 }; | |
| 75 | |
| 76 | |
| 77 #endif // BASE_LOCK_IMPL_H_ |
