1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/synchronization/lock_impl.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,61 @@
1.4 +// Copyright (c) 2011 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_
1.9 +#define BASE_SYNCHRONIZATION_LOCK_IMPL_H_
1.10 +
1.11 +#include "build/build_config.h"
1.12 +
1.13 +#if defined(OS_WIN)
1.14 +#include <windows.h>
1.15 +#elif defined(OS_POSIX)
1.16 +#include <pthread.h>
1.17 +#endif
1.18 +
1.19 +#include "base/base_export.h"
1.20 +#include "base/basictypes.h"
1.21 +
1.22 +namespace base {
1.23 +namespace internal {
1.24 +
1.25 +// This class implements the underlying platform-specific spin-lock mechanism
1.26 +// used for the Lock class. Most users should not use LockImpl directly, but
1.27 +// should instead use Lock.
1.28 +class BASE_EXPORT LockImpl {
1.29 + public:
1.30 +#if defined(OS_WIN)
1.31 + typedef CRITICAL_SECTION NativeHandle;
1.32 +#elif defined(OS_POSIX)
1.33 + typedef pthread_mutex_t NativeHandle;
1.34 +#endif
1.35 +
1.36 + LockImpl();
1.37 + ~LockImpl();
1.38 +
1.39 + // If the lock is not held, take it and return true. If the lock is already
1.40 + // held by something else, immediately return false.
1.41 + bool Try();
1.42 +
1.43 + // Take the lock, blocking until it is available if necessary.
1.44 + void Lock();
1.45 +
1.46 + // Release the lock. This must only be called by the lock's holder: after
1.47 + // a successful call to Try, or a call to Lock.
1.48 + void Unlock();
1.49 +
1.50 + // Return the native underlying lock.
1.51 + // TODO(awalker): refactor lock and condition variables so that this is
1.52 + // unnecessary.
1.53 + NativeHandle* native_handle() { return &native_handle_; }
1.54 +
1.55 + private:
1.56 + NativeHandle native_handle_;
1.57 +
1.58 + DISALLOW_COPY_AND_ASSIGN(LockImpl);
1.59 +};
1.60 +
1.61 +} // namespace internal
1.62 +} // namespace base
1.63 +
1.64 +#endif // BASE_SYNCHRONIZATION_LOCK_IMPL_H_
