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// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// * Neither the name of Google Inc. nor the name Chromium Embedded

// Framework nor the names of its contributors may be used to endorse

// or promote products derived from this software without specific prior

// written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Do not include this header file directly. Use base/cef_lock.h instead.

#ifndef CEF_INCLUDE_BASE_INTERNAL_CEF_LOCK_IMPL_H_

#define CEF_INCLUDE_BASE_INTERNAL_CEF_LOCK_IMPL_H_

#include "include/base/cef_build.h"

#if defined(OS_WIN)

#include <windows.h>

#elif defined(OS_POSIX)

#include <pthread.h>

#endif

#include "include/base/cef_macros.h"

namespace base {

namespace cef_internal {

// This class implements the underlying platform-specific spin-lock mechanism

// used for the Lock class. Most users should not use LockImpl directly, but

// should instead use Lock.

class LockImpl {

public:

#if defined(OS_WIN)

typedef CRITICAL_SECTION NativeHandle;

#elif defined(OS_POSIX)

typedef pthread_mutex_t NativeHandle;

#endif

LockImpl();

~LockImpl();

// If the lock is not held, take it and return true. If the lock is already

// held by something else, immediately return false.

bool Try();

// Take the lock, blocking until it is available if necessary.

void Lock();

// Release the lock. This must only be called by the lock's holder: after

// a successful call to Try, or a call to Lock.

void Unlock();

// Return the native underlying lock.

// TODO(awalker): refactor lock and condition variables so that this is

// unnecessary.

NativeHandle* native_handle() { return &native_handle_; }

private:

NativeHandle native_handle_;

DISALLOW_COPY_AND_ASSIGN(LockImpl);

};

} // namespace cef_internal

} // namespace base

#endif // CEF_INCLUDE_BASE_INTERNAL_CEF_LOCK_IMPL_H_

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