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juce_Thread.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
//==============================================================================
Thread::Thread (const String& name, size_t stackSize) : threadName (name),
threadStackSize (stackSize)
{
}
Thread::~Thread()
{
if (deleteOnThreadEnd)
return;
/* If your thread class's destructor has been called without first stopping the thread, that
means that this partially destructed object is still performing some work - and that's
probably a Bad Thing!
To avoid this type of nastiness, always make sure you call stopThread() before or during
your subclass's destructor.
*/
jassert (! isThreadRunning());
stopThread (-1);
}
//==============================================================================
// Use a ref-counted object to hold this shared data, so that it can outlive its static
// shared pointer when threads are still running during static shutdown.
struct CurrentThreadHolder final : public ReferenceCountedObject
{
CurrentThreadHolder() noexcept {}
using Ptr = ReferenceCountedObjectPtr<CurrentThreadHolder>;
ThreadLocalValue<Thread*> value;
JUCE_DECLARE_NON_COPYABLE (CurrentThreadHolder)
};
static char currentThreadHolderLock [sizeof (SpinLock)]; // (statically initialised to zeros).
static SpinLock* castToSpinLockWithoutAliasingWarning (void* s)
{
return static_cast<SpinLock*> (s);
}
static CurrentThreadHolder::Ptr getCurrentThreadHolder()
{
static CurrentThreadHolder::Ptr currentThreadHolder;
SpinLock::ScopedLockType lock (*castToSpinLockWithoutAliasingWarning (currentThreadHolderLock));
if (currentThreadHolder == nullptr)
currentThreadHolder = new CurrentThreadHolder();
return currentThreadHolder;
}
void Thread::threadEntryPoint()
{
const CurrentThreadHolder::Ptr currentThreadHolder (getCurrentThreadHolder());
currentThreadHolder->value = this;
if (threadName.isNotEmpty())
setCurrentThreadName (threadName);
// This 'startSuspensionEvent' protects 'threadId' which is initialised after the platform's native 'CreateThread' method.
// This ensures it has been initialised correctly before it reaches this point.
if (startSuspensionEvent.wait (10000))
{
jassert (getCurrentThreadId() == threadId);
if (affinityMask != 0)
setCurrentThreadAffinityMask (affinityMask);
try
{
run();
}
catch (...)
{
jassertfalse; // Your run() method mustn't throw any exceptions!
}
}
currentThreadHolder->value.releaseCurrentThreadStorage();
// Once closeThreadHandle is called this class may be deleted by a different
// thread, so we need to store deleteOnThreadEnd in a local variable.
auto shouldDeleteThis = deleteOnThreadEnd;
closeThreadHandle();
if (shouldDeleteThis)
delete this;
}
// used to wrap the incoming call from the platform-specific code
void JUCE_API juce_threadEntryPoint (void* userData)
{
static_cast<Thread*> (userData)->threadEntryPoint();
}
//==============================================================================
bool Thread::startThreadInternal (Priority threadPriority)
{
shouldExit = false;
// 'priority' is essentially useless on Linux as only realtime
// has any options but we need to set this here to satisfy
// later queries, otherwise we get inconsistent results across
// platforms.
#if JUCE_ANDROID || JUCE_LINUX || JUCE_BSD
priority = threadPriority;
#endif
if (createNativeThread (threadPriority))
{
startSuspensionEvent.signal();
return true;
}
return false;
}
bool Thread::startThread()
{
return startThread (Priority::normal);
}
bool Thread::startThread (Priority threadPriority)
{
const ScopedLock sl (startStopLock);
if (threadHandle == nullptr)
{
realtimeOptions.reset();
return startThreadInternal (threadPriority);
}
return false;
}
bool Thread::startRealtimeThread (const RealtimeOptions& options)
{
const ScopedLock sl (startStopLock);
if (threadHandle == nullptr)
{
realtimeOptions = std::make_optional (options);
if (startThreadInternal (Priority::normal))
return true;
realtimeOptions.reset();
}
return false;
}
bool Thread::isThreadRunning() const
{
return threadHandle != nullptr;
}
Thread* JUCE_CALLTYPE Thread::getCurrentThread()
{
return getCurrentThreadHolder()->value.get();
}
Thread::ThreadID Thread::getThreadId() const noexcept
{
return threadId;
}
//==============================================================================
void Thread::signalThreadShouldExit()
{
shouldExit = true;
listeners.call ([] (Listener& l) { l.exitSignalSent(); });
}
bool Thread::threadShouldExit() const
{
return shouldExit;
}
bool Thread::currentThreadShouldExit()
{
if (auto* currentThread = getCurrentThread())
return currentThread->threadShouldExit();
return false;
}
bool Thread::waitForThreadToExit (const int timeOutMilliseconds) const
{
// Doh! So how exactly do you expect this thread to wait for itself to stop??
jassert (getThreadId() != getCurrentThreadId() || getCurrentThreadId() == ThreadID());
auto timeoutEnd = Time::getMillisecondCounter() + (uint32) timeOutMilliseconds;
while (isThreadRunning())
{
if (timeOutMilliseconds >= 0 && Time::getMillisecondCounter() > timeoutEnd)
return false;
sleep (2);
}
return true;
}
bool Thread::stopThread (const int timeOutMilliseconds)
{
// agh! You can't stop the thread that's calling this method! How on earth
// would that work??
jassert (getCurrentThreadId() != getThreadId());
const ScopedLock sl (startStopLock);
if (isThreadRunning())
{
signalThreadShouldExit();
notify();
if (timeOutMilliseconds != 0)
waitForThreadToExit (timeOutMilliseconds);
if (isThreadRunning())
{
// very bad karma if this point is reached, as there are bound to be
// locks and events left in silly states when a thread is killed by force..
jassertfalse;
Logger::writeToLog ("!! killing thread by force !!");
killThread();
threadHandle = nullptr;
threadId = {};
return false;
}
}
return true;
}
void Thread::addListener (Listener* listener)
{
listeners.add (listener);
}
void Thread::removeListener (Listener* listener)
{
listeners.remove (listener);
}
bool Thread::isRealtime() const
{
return realtimeOptions.has_value();
}
void Thread::setAffinityMask (const uint32 newAffinityMask)
{
affinityMask = newAffinityMask;
}
//==============================================================================
bool Thread::wait (double timeOutMilliseconds) const
{
return defaultEvent.wait (timeOutMilliseconds);
}
void Thread::notify() const
{
defaultEvent.signal();
}
//==============================================================================
struct LambdaThread final : public Thread
{
LambdaThread (std::function<void()>&& f) : Thread ("anonymous"), fn (std::move (f)) {}
void run() override
{
fn();
fn = nullptr; // free any objects that the lambda might contain while the thread is still active
}
std::function<void()> fn;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LambdaThread)
};
bool Thread::launch (std::function<void()> functionToRun)
{
return launch (Priority::normal, std::move (functionToRun));
}
bool Thread::launch (Priority priority, std::function<void()> functionToRun)
{
auto anon = std::make_unique<LambdaThread> (std::move (functionToRun));
anon->deleteOnThreadEnd = true;
if (anon->startThread (priority))
{
anon.release();
return true;
}
return false;
}
//==============================================================================
void SpinLock::enter() const noexcept
{
if (! tryEnter())
{
for (int i = 20; --i >= 0;)
if (tryEnter())
return;
while (! tryEnter())
Thread::yield();
}
}
//==============================================================================
bool JUCE_CALLTYPE Process::isRunningUnderDebugger() noexcept
{
return juce_isRunningUnderDebugger();
}
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
class AtomicTests final : public UnitTest
{
public:
AtomicTests()
: UnitTest ("Atomics", UnitTestCategories::threads)
{}
void runTest() override
{
beginTest ("Misc");
char a1[7];
expect (numElementsInArray (a1) == 7);
int a2[3];
expect (numElementsInArray (a2) == 3);
expect (ByteOrder::swap ((uint16) 0x1122) == 0x2211);
expect (ByteOrder::swap ((uint32) 0x11223344) == 0x44332211);
expect (ByteOrder::swap ((uint64) 0x1122334455667788ULL) == (uint64) 0x8877665544332211LL);
beginTest ("Atomic int");
AtomicTester <int>::testInteger (*this);
beginTest ("Atomic unsigned int");
AtomicTester <unsigned int>::testInteger (*this);
beginTest ("Atomic int32");
AtomicTester <int32>::testInteger (*this);
beginTest ("Atomic uint32");
AtomicTester <uint32>::testInteger (*this);
beginTest ("Atomic long");
AtomicTester <long>::testInteger (*this);
beginTest ("Atomic int*");
AtomicTester <int*>::testInteger (*this);
beginTest ("Atomic float");
AtomicTester <float>::testFloat (*this);
#if ! JUCE_64BIT_ATOMICS_UNAVAILABLE // 64-bit intrinsics aren't available on some old platforms
beginTest ("Atomic int64");
AtomicTester <int64>::testInteger (*this);
beginTest ("Atomic uint64");
AtomicTester <uint64>::testInteger (*this);
beginTest ("Atomic double");
AtomicTester <double>::testFloat (*this);
#endif
beginTest ("Atomic pointer increment/decrement");
Atomic<int*> a (a2); int* b (a2);
expect (++a == ++b);
{
beginTest ("Atomic void*");
Atomic<void*> atomic;
void* c;
atomic.set ((void*) 10);
c = (void*) 10;
expect (atomic.value == c);
expect (atomic.get() == c);
}
}
template <typename Type>
class AtomicTester
{
public:
AtomicTester() = default;
static void testInteger (UnitTest& test)
{
Atomic<Type> a, b;
Type c;
a.set ((Type) 10);
c = (Type) 10;
test.expect (a.value == c);
test.expect (a.get() == c);
a += 15;
c += 15;
test.expect (a.get() == c);
a.memoryBarrier();
a -= 5;
c -= 5;
test.expect (a.get() == c);
test.expect (++a == ++c);
++a;
++c;
test.expect (--a == --c);
test.expect (a.get() == c);
a.memoryBarrier();
testFloat (test);
}
static void testFloat (UnitTest& test)
{
Atomic<Type> a, b;
a = (Type) 101;
a.memoryBarrier();
/* These are some simple test cases to check the atomics - let me know
if any of these assertions fail on your system!
*/
test.expect (exactlyEqual (a.get(), (Type) 101));
test.expect (! a.compareAndSetBool ((Type) 300, (Type) 200));
test.expect (exactlyEqual (a.get(), (Type) 101));
test.expect (a.compareAndSetBool ((Type) 200, a.get()));
test.expect (exactlyEqual (a.get(), (Type) 200));
test.expect (exactlyEqual (a.exchange ((Type) 300), (Type) 200));
test.expect (exactlyEqual (a.get(), (Type) 300));
b = a;
test.expect (exactlyEqual (b.get(), a.get()));
}
};
};
static AtomicTests atomicUnitTests;
//==============================================================================
class ThreadLocalValueUnitTest final : public UnitTest,
private Thread
{
public:
ThreadLocalValueUnitTest()
: UnitTest ("ThreadLocalValue", UnitTestCategories::threads),
Thread ("ThreadLocalValue Thread")
{}
void runTest() override
{
beginTest ("values are thread local");
{
ThreadLocalValue<int> threadLocal;
sharedThreadLocal = &threadLocal;
sharedThreadLocal.get()->get() = 1;
startThread();
signalThreadShouldExit();
waitForThreadToExit (-1);
mainThreadResult = sharedThreadLocal.get()->get();
expectEquals (mainThreadResult.get(), 1);
expectEquals (auxThreadResult.get(), 2);
}
beginTest ("values are per-instance");
{
ThreadLocalValue<int> a, b;
a.get() = 1;
b.get() = 2;
expectEquals (a.get(), 1);
expectEquals (b.get(), 2);
}
}
private:
Atomic<int> mainThreadResult, auxThreadResult;
Atomic<ThreadLocalValue<int>*> sharedThreadLocal;
void run() override
{
sharedThreadLocal.get()->get() = 2;
auxThreadResult = sharedThreadLocal.get()->get();
}
};
ThreadLocalValueUnitTest threadLocalValueUnitTest;
#endif
} // namespace juce
juce::Logger::writeToLog
static void JUCE_CALLTYPE writeToLog(const String &message)
Definition juce_Logger.cpp:40
juce::Process::isRunningUnderDebugger
static bool JUCE_CALLTYPE isRunningUnderDebugger() noexcept
Definition juce_Thread.cpp:348
juce::ReferenceCountedObject
Definition juce_ReferenceCountedObject.h:66
juce::SpinLock
Definition juce_SpinLock.h:42
juce::SpinLock::enter
void enter() const noexcept
Definition juce_Thread.cpp:334
juce::SpinLock::tryEnter
bool tryEnter() const noexcept
Definition juce_SpinLock.h:59
juce::SpinLock::ScopedLockType
GenericScopedLock< SpinLock > ScopedLockType
Definition juce_SpinLock.h:73
juce::String
Definition juce_String.h:53
juce::Thread::Listener
Definition juce_Thread.h:396
juce::Thread::Listener::exitSignalSent
virtual void exitSignalSent()=0
juce::Thread
Definition juce_Thread.h:43
juce::Thread::setAffinityMask
void setAffinityMask(uint32 affinityMask)
Definition juce_Thread.cpp:282
juce::Thread::setCurrentThreadAffinityMask
static void JUCE_CALLTYPE setCurrentThreadAffinityMask(uint32 affinityMask)
juce::Thread::ThreadID
void * ThreadID
Definition juce_Thread.h:477
juce::Thread::sleep
static void JUCE_CALLTYPE sleep(int milliseconds)
juce::Thread::isRealtime
bool isRealtime() const
Definition juce_Thread.cpp:277
juce::Thread::~Thread
virtual ~Thread()
Definition juce_Thread.cpp:31
juce::Thread::getCurrentThread
static Thread *JUCE_CALLTYPE getCurrentThread()
Definition juce_Thread.cpp:185
juce::Thread::wait
bool wait(double timeOutMilliseconds) const
Definition juce_Thread.cpp:288
juce::Thread::launch
static bool launch(std::function< void()> functionToRun)
Definition juce_Thread.cpp:314
juce::Thread::getThreadId
ThreadID getThreadId() const noexcept
Definition juce_Thread.cpp:190
juce::Thread::waitForThreadToExit
bool waitForThreadToExit(int timeOutMilliseconds) const
Definition juce_Thread.cpp:215
juce::Thread::setCurrentThreadName
static void JUCE_CALLTYPE setCurrentThreadName(const String &newThreadName)
juce::Thread::Thread
Thread(const String &threadName, size_t threadStackSize=osDefaultStackSize)
Definition juce_Thread.cpp:26
juce::Thread::run
virtual void run()=0
juce::Thread::startThread
bool startThread()
Definition juce_Thread.cpp:145
juce::Thread::currentThreadShouldExit
static bool currentThreadShouldExit()
Definition juce_Thread.cpp:207
juce::Thread::threadShouldExit
bool threadShouldExit() const
Definition juce_Thread.cpp:202
juce::Thread::startRealtimeThread
bool startRealtimeThread(const RealtimeOptions &options)
Definition juce_Thread.cpp:163
juce::Thread::yield
static void JUCE_CALLTYPE yield()
juce::Thread::getCurrentThreadId
static ThreadID JUCE_CALLTYPE getCurrentThreadId()
juce::Thread::stopThread
bool stopThread(int timeOutMilliseconds)
Definition juce_Thread.cpp:233
juce::Thread::notify
void notify() const
Definition juce_Thread.cpp:293
juce::Thread::addListener
void addListener(Listener *)
Definition juce_Thread.cpp:267
juce::Thread::signalThreadShouldExit
void signalThreadShouldExit()
Definition juce_Thread.cpp:196
juce::Thread::Priority
Priority
Definition juce_Thread.h:54
juce::Thread::Priority::normal
@ normal
Definition juce_Thread.h:62
juce::Thread::isThreadRunning
bool isThreadRunning() const
Definition juce_Thread.cpp:180
juce::Thread::removeListener
void removeListener(Listener *)
Definition juce_Thread.cpp:272
juce::Time::getMillisecondCounter
static uint32 getMillisecondCounter() noexcept
Definition juce_Time.cpp:241
juce::UnitTest
Definition juce_UnitTest.h:70
juce::Thread::RealtimeOptions
Definition juce_Thread.h:77