blob: 23a79f2e682aa0e584b60bf373e2516044dfcd09 [file] [log] [blame]
/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include <wtf/PrintStream.h>
#include <wtf/RecursiveLockAdapter.h>
#include <wtf/WordLock.h>
namespace WTF {
// Makes every call to print() atomic.
class LockedPrintStream final : public PrintStream {
public:
LockedPrintStream(std::unique_ptr<PrintStream> target);
~LockedPrintStream() final;
void vprintf(const char* format, va_list) final WTF_ATTRIBUTE_PRINTF(2, 0);
void flush() final;
private:
PrintStream& begin() final;
void end() final;
// This needs to be a recursive lock because a printInternal or dump method could assert,
// and that assert might want to log. Better to let it. This needs to be a WordLock so that
// LockedPrintStream (i.e. cataLog) can be used to debug ParkingLot and Lock.
RecursiveLockAdapter<WordLock> m_lock;
std::unique_ptr<PrintStream> m_target;
};
} // namespace WTF
using WTF::LockedPrintStream;