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/*
* Copyright (C) 2013-2022 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.
*/
#include "config.h"
#include "OriginLock.h"
namespace WebCore {
static String lockFileNameForPath(const String& originPath)
{
return FileSystem::pathByAppendingComponent(originPath, ".lock"_s);
}
OriginLock::OriginLock(const String& originPath)
: m_lockFileName(lockFileNameForPath(originPath).isolatedCopy())
{
}
OriginLock::~OriginLock() = default;
void OriginLock::lock() WTF_IGNORES_THREAD_SAFETY_ANALYSIS
{
m_mutex.lock();
#if USE(FILE_LOCK)
m_lockHandle = FileSystem::openAndLockFile(m_lockFileName, FileSystem::FileOpenMode::Truncate);
if (m_lockHandle == FileSystem::invalidPlatformFileHandle) {
// The only way we can get here is if the directory containing the lock
// has been deleted or we were given a path to a non-existant directory.
// In that case, there's nothing we can do but cleanup and return.
m_mutex.unlock();
return;
}
#endif
}
void OriginLock::unlock() WTF_IGNORES_THREAD_SAFETY_ANALYSIS
{
#if USE(FILE_LOCK)
// If the file descriptor was uninitialized, then that means the directory
// containing the lock has been deleted before we opened the lock file, or
// we were given a path to a non-existant directory. Which, in turn, means
// that there's nothing to unlock.
if (m_lockHandle == FileSystem::invalidPlatformFileHandle)
return;
FileSystem::unlockAndCloseFile(m_lockHandle);
m_lockHandle = FileSystem::invalidPlatformFileHandle;
#endif
m_mutex.unlock();
}
void OriginLock::deleteLockFile(const String& originPath)
{
#if USE(FILE_LOCK)
FileSystem::deleteFile(lockFileNameForPath(originPath));
#else
UNUSED_PARAM(originPath);
#endif
}
} // namespace WebCore
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