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/*
* Copyright (C) 2008, 2009, 2014 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 AND ITS 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 APPLE OR ITS 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 "Threading.h"
#include <algorithm>
#include <cmath>
#include <cstring>
#include <wtf/text/StringView.h>
#if HAVE(QOS_CLASSES)
#include <bmalloc/bmalloc.h>
#endif
namespace WTF {
struct NewThreadContext {
WTF_MAKE_FAST_ALLOCATED;
public:
const char* name;
std::function<void()> entryPoint;
Mutex creationMutex;
};
const char* normalizeThreadName(const char* threadName)
{
#if HAVE(PTHREAD_SETNAME_NP)
return threadName;
#else
// This name can be com.apple.WebKit.ProcessLauncher or com.apple.CoreIPC.ReceiveQueue.
// We are using those names for the thread name, but both are longer than the limit of
// the platform thread name length, 32 for Windows and 16 for Linux.
StringView result(threadName);
size_t size = result.reverseFind('.');
if (size != notFound)
result = result.substring(size + 1);
#if OS(WINDOWS)
constexpr const size_t kVisualStudioThreadNameLimit = 32 - 1;
if (result.length() > kVisualStudioThreadNameLimit)
result = result.right(kVisualStudioThreadNameLimit);
#elif OS(LINUX)
constexpr const size_t kLinuxThreadNameLimit = 16 - 1;
if (result.length() > kLinuxThreadNameLimit)
result = result.right(kLinuxThreadNameLimit);
#endif
ASSERT(result.characters8()[result.length()] == '\0');
return reinterpret_cast<const char*>(result.characters8());
#endif
}
static void threadEntryPoint(void* contextData)
{
NewThreadContext* context = static_cast<NewThreadContext*>(contextData);
// Block until our creating thread has completed any extra setup work, including
// establishing ThreadIdentifier.
{
MutexLocker locker(context->creationMutex);
}
initializeCurrentThreadInternal(context->name);
auto entryPoint = WTFMove(context->entryPoint);
// Delete the context before starting the thread.
delete context;
entryPoint();
}
ThreadIdentifier createThread(const char* name, std::function<void()> entryPoint)
{
NewThreadContext* context = new NewThreadContext { name, WTFMove(entryPoint), { } };
// Prevent the thread body from executing until we've established the thread identifier.
MutexLocker locker(context->creationMutex);
return createThreadInternal(threadEntryPoint, context, name);
}
ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)
{
return createThread(name, [entryPoint, data] {
entryPoint(data);
});
}
void setCurrentThreadIsUserInteractive(int relativePriority)
{
#if HAVE(QOS_CLASSES)
ASSERT(relativePriority <= 0);
ASSERT(relativePriority >= QOS_MIN_RELATIVE_PRIORITY);
pthread_set_qos_class_self_np(adjustedQOSClass(QOS_CLASS_USER_INTERACTIVE), relativePriority);
#else
UNUSED_PARAM(relativePriority);
#endif
}
void setCurrentThreadIsUserInitiated(int relativePriority)
{
#if HAVE(QOS_CLASSES)
ASSERT(relativePriority <= 0);
ASSERT(relativePriority >= QOS_MIN_RELATIVE_PRIORITY);
pthread_set_qos_class_self_np(adjustedQOSClass(QOS_CLASS_USER_INITIATED), relativePriority);
#else
UNUSED_PARAM(relativePriority);
#endif
}
#if HAVE(QOS_CLASSES)
static qos_class_t globalMaxQOSclass { QOS_CLASS_UNSPECIFIED };
void setGlobalMaxQOSClass(qos_class_t maxClass)
{
bmalloc::api::setScavengerThreadQOSClass(maxClass);
globalMaxQOSclass = maxClass;
}
qos_class_t adjustedQOSClass(qos_class_t originalClass)
{
if (globalMaxQOSclass != QOS_CLASS_UNSPECIFIED)
return std::min(originalClass, globalMaxQOSclass);
return originalClass;
}
#endif
} // namespace WTF
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