// Copyright 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MINI_CHROMIUM_BASE_SYNCHRONIZATION_LOCK_IMPL_H_
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#define MINI_CHROMIUM_BASE_SYNCHRONIZATION_LOCK_IMPL_H_
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#elif defined(OS_POSIX)
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#include <pthread.h>
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#endif
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#include "base/macros.h"
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namespace base {
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namespace internal {
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// This class implements the underlying platform-specific spin-lock mechanism
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// used for the Lock class. Most users should not use LockImpl directly, but
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// should instead use Lock.
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class LockImpl {
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public:
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#if defined(OS_WIN)
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typedef CRITICAL_SECTION NativeHandle;
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#elif defined(OS_POSIX)
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typedef pthread_mutex_t NativeHandle;
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#endif
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LockImpl();
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~LockImpl();
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// If the lock is not held, take it and return true. If the lock is already
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// held by something else, immediately return false.
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bool Try();
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// Take the lock, blocking until it is available if necessary.
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void Lock();
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// Release the lock. This must only be called by the lock's holder: after
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// a successful call to Try, or a call to Lock.
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void Unlock();
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// Return the native underlying lock.
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// TODO(awalker): refactor lock and condition variables so that this is
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// unnecessary.
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NativeHandle* native_handle() { return &native_handle_; }
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private:
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NativeHandle native_handle_;
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DISALLOW_COPY_AND_ASSIGN(LockImpl);
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};
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} // namespace internal
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} // namespace base
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#endif // MINI_CHROMIUM_BASE_SYNCHRONIZATION_LOCK_IMPL_H_
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