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juce_Thread.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25//==============================================================================
26 Thread::Thread (const String& name, size_t stackSize) : threadName (name),
27 threadStackSize (stackSize)
28{
29}
30
31 Thread::~Thread()
32{
33 if (deleteOnThreadEnd)
34 return;
35
36 /* If your thread class's destructor has been called without first stopping the thread, that
37 means that this partially destructed object is still performing some work - and that's
38 probably a Bad Thing!
39
40 To avoid this type of nastiness, always make sure you call stopThread() before or during
41 your subclass's destructor.
42 */
43 jassert (! isThreadRunning());
44
45 stopThread (-1);
46}
47
48//==============================================================================
49// Use a ref-counted object to hold this shared data, so that it can outlive its static
50// shared pointer when threads are still running during static shutdown.
51 struct CurrentThreadHolder final : public ReferenceCountedObject
52{
53 CurrentThreadHolder() noexcept {}
54
55 using Ptr = ReferenceCountedObjectPtr<CurrentThreadHolder>;
56 ThreadLocalValue<Thread*> value;
57
58 JUCE_DECLARE_NON_COPYABLE (CurrentThreadHolder)
59};
60
61 static char currentThreadHolderLock [sizeof (SpinLock)]; // (statically initialised to zeros).
62
63 static SpinLock* castToSpinLockWithoutAliasingWarning (void* s)
64{
65 return static_cast<SpinLock*> (s);
66}
67
68 static CurrentThreadHolder::Ptr getCurrentThreadHolder()
69{
70 static CurrentThreadHolder::Ptr currentThreadHolder;
71 SpinLock::ScopedLockType lock (*castToSpinLockWithoutAliasingWarning (currentThreadHolderLock));
72
73 if (currentThreadHolder == nullptr)
74 currentThreadHolder = new CurrentThreadHolder();
75
76 return currentThreadHolder;
77}
78
79 void Thread::threadEntryPoint()
80{
81 const CurrentThreadHolder::Ptr currentThreadHolder (getCurrentThreadHolder());
82 currentThreadHolder->value = this;
83
84 if (threadName.isNotEmpty())
85 setCurrentThreadName (threadName);
86
87 // This 'startSuspensionEvent' protects 'threadId' which is initialised after the platform's native 'CreateThread' method.
88 // This ensures it has been initialised correctly before it reaches this point.
89 if (startSuspensionEvent.wait (10000))
90 {
91 jassert (getCurrentThreadId() == threadId);
92
93 if (affinityMask != 0)
94 setCurrentThreadAffinityMask (affinityMask);
95
96 try
97 {
98 run();
99 }
100 catch (...)
101 {
102 jassertfalse; // Your run() method mustn't throw any exceptions!
103 }
104 }
105
106 currentThreadHolder->value.releaseCurrentThreadStorage();
107
108 // Once closeThreadHandle is called this class may be deleted by a different
109 // thread, so we need to store deleteOnThreadEnd in a local variable.
110 auto shouldDeleteThis = deleteOnThreadEnd;
111 closeThreadHandle();
112
113 if (shouldDeleteThis)
114 delete this;
115}
116
117// used to wrap the incoming call from the platform-specific code
118 void JUCE_API juce_threadEntryPoint (void* userData)
119{
120 static_cast<Thread*> (userData)->threadEntryPoint();
121}
122
123//==============================================================================
124 bool Thread::startThreadInternal (Priority threadPriority)
125{
126 shouldExit = false;
127
128 // 'priority' is essentially useless on Linux as only realtime
129 // has any options but we need to set this here to satisfy
130 // later queries, otherwise we get inconsistent results across
131 // platforms.
132 #if JUCE_ANDROID || JUCE_LINUX || JUCE_BSD
133 priority = threadPriority;
134 #endif
135
136 if (createNativeThread (threadPriority))
137 {
138 startSuspensionEvent.signal();
139 return true;
140 }
141
142 return false;
143}
144
145 bool Thread::startThread()
146{
147 return startThread (Priority::normal);
148}
149
150 bool Thread::startThread (Priority threadPriority)
151{
152 const ScopedLock sl (startStopLock);
153
154 if (threadHandle == nullptr)
155 {
156 realtimeOptions.reset();
157 return startThreadInternal (threadPriority);
158 }
159
160 return false;
161}
162
163 bool Thread::startRealtimeThread (const RealtimeOptions& options)
164{
165 const ScopedLock sl (startStopLock);
166
167 if (threadHandle == nullptr)
168 {
169 realtimeOptions = std::make_optional (options);
170
171 if (startThreadInternal (Priority::normal))
172 return true;
173
174 realtimeOptions.reset();
175 }
176
177 return false;
178}
179
180 bool Thread::isThreadRunning() const
181{
182 return threadHandle != nullptr;
183}
184
185 Thread* JUCE_CALLTYPE Thread::getCurrentThread()
186{
187 return getCurrentThreadHolder()->value.get();
188}
189
190 Thread::ThreadID Thread::getThreadId() const noexcept
191{
192 return threadId;
193}
194
195//==============================================================================
196 void Thread::signalThreadShouldExit()
197{
198 shouldExit = true;
199 listeners.call ([] (Listener& l) { l.exitSignalSent(); });
200}
201
202 bool Thread::threadShouldExit() const
203{
204 return shouldExit;
205}
206
207 bool Thread::currentThreadShouldExit()
208{
209 if (auto* currentThread = getCurrentThread())
210 return currentThread->threadShouldExit();
211
212 return false;
213}
214
215 bool Thread::waitForThreadToExit (const int timeOutMilliseconds) const
216{
217 // Doh! So how exactly do you expect this thread to wait for itself to stop??
218 jassert (getThreadId() != getCurrentThreadId() || getCurrentThreadId() == ThreadID());
219
220 auto timeoutEnd = Time::getMillisecondCounter() + (uint32) timeOutMilliseconds;
221
222 while (isThreadRunning())
223 {
224 if (timeOutMilliseconds >= 0 && Time::getMillisecondCounter() > timeoutEnd)
225 return false;
226
227 sleep (2);
228 }
229
230 return true;
231}
232
233 bool Thread::stopThread (const int timeOutMilliseconds)
234{
235 // agh! You can't stop the thread that's calling this method! How on earth
236 // would that work??
237 jassert (getCurrentThreadId() != getThreadId());
238
239 const ScopedLock sl (startStopLock);
240
241 if (isThreadRunning())
242 {
243 signalThreadShouldExit();
244 notify();
245
246 if (timeOutMilliseconds != 0)
247 waitForThreadToExit (timeOutMilliseconds);
248
249 if (isThreadRunning())
250 {
251 // very bad karma if this point is reached, as there are bound to be
252 // locks and events left in silly states when a thread is killed by force..
253 jassertfalse;
254 Logger::writeToLog ("!! killing thread by force !!");
255
256 killThread();
257
258 threadHandle = nullptr;
259 threadId = {};
260 return false;
261 }
262 }
263
264 return true;
265}
266
267 void Thread::addListener (Listener* listener)
268{
269 listeners.add (listener);
270}
271
272 void Thread::removeListener (Listener* listener)
273{
274 listeners.remove (listener);
275}
276
277 bool Thread::isRealtime() const
278{
279 return realtimeOptions.has_value();
280}
281
282 void Thread::setAffinityMask (const uint32 newAffinityMask)
283{
284 affinityMask = newAffinityMask;
285}
286
287//==============================================================================
288 bool Thread::wait (double timeOutMilliseconds) const
289{
290 return defaultEvent.wait (timeOutMilliseconds);
291}
292
293 void Thread::notify() const
294{
295 defaultEvent.signal();
296}
297
298//==============================================================================
299 struct LambdaThread final : public Thread
300{
301 LambdaThread (std::function<void()>&& f) : Thread ("anonymous"), fn (std::move (f)) {}
302
303 void run() override
304 {
305 fn();
306 fn = nullptr; // free any objects that the lambda might contain while the thread is still active
307 }
308
309 std::function<void()> fn;
310
311 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LambdaThread)
312};
313
314 bool Thread::launch (std::function<void()> functionToRun)
315{
316 return launch (Priority::normal, std::move (functionToRun));
317}
318
319 bool Thread::launch (Priority priority, std::function<void()> functionToRun)
320{
321 auto anon = std::make_unique<LambdaThread> (std::move (functionToRun));
322 anon->deleteOnThreadEnd = true;
323
324 if (anon->startThread (priority))
325 {
326 anon.release();
327 return true;
328 }
329
330 return false;
331}
332
333//==============================================================================
334 void SpinLock::enter() const noexcept
335{
336 if (! tryEnter())
337 {
338 for (int i = 20; --i >= 0;)
339 if (tryEnter())
340 return;
341
342 while (! tryEnter())
343 Thread::yield();
344 }
345}
346
347//==============================================================================
348 bool JUCE_CALLTYPE Process::isRunningUnderDebugger() noexcept
349{
350 return juce_isRunningUnderDebugger();
351}
352
353//==============================================================================
354//==============================================================================
355#if JUCE_UNIT_TESTS
356
357 class AtomicTests final : public UnitTest
358{
359 public:
360 AtomicTests()
361 : UnitTest ("Atomics", UnitTestCategories::threads)
362 {}
363
364 void runTest() override
365 {
366 beginTest ("Misc");
367
368 char a1[7];
369 expect (numElementsInArray (a1) == 7);
370 int a2[3];
371 expect (numElementsInArray (a2) == 3);
372
373 expect (ByteOrder::swap ((uint16) 0x1122) == 0x2211);
374 expect (ByteOrder::swap ((uint32) 0x11223344) == 0x44332211);
375 expect (ByteOrder::swap ((uint64) 0x1122334455667788ULL) == (uint64) 0x8877665544332211LL);
376
377 beginTest ("Atomic int");
378 AtomicTester <int>::testInteger (*this);
379 beginTest ("Atomic unsigned int");
380 AtomicTester <unsigned int>::testInteger (*this);
381 beginTest ("Atomic int32");
382 AtomicTester <int32>::testInteger (*this);
383 beginTest ("Atomic uint32");
384 AtomicTester <uint32>::testInteger (*this);
385 beginTest ("Atomic long");
386 AtomicTester <long>::testInteger (*this);
387 beginTest ("Atomic int*");
388 AtomicTester <int*>::testInteger (*this);
389 beginTest ("Atomic float");
390 AtomicTester <float>::testFloat (*this);
391 #if ! JUCE_64BIT_ATOMICS_UNAVAILABLE // 64-bit intrinsics aren't available on some old platforms
392 beginTest ("Atomic int64");
393 AtomicTester <int64>::testInteger (*this);
394 beginTest ("Atomic uint64");
395 AtomicTester <uint64>::testInteger (*this);
396 beginTest ("Atomic double");
397 AtomicTester <double>::testFloat (*this);
398 #endif
399 beginTest ("Atomic pointer increment/decrement");
400 Atomic<int*> a (a2); int* b (a2);
401 expect (++a == ++b);
402
403 {
404 beginTest ("Atomic void*");
405 Atomic<void*> atomic;
406 void* c;
407
408 atomic.set ((void*) 10);
409 c = (void*) 10;
410
411 expect (atomic.value == c);
412 expect (atomic.get() == c);
413 }
414 }
415
416 template <typename Type>
417 class AtomicTester
418 {
419 public:
420 AtomicTester() = default;
421
422 static void testInteger (UnitTest& test)
423 {
424 Atomic<Type> a, b;
425 Type c;
426
427 a.set ((Type) 10);
428 c = (Type) 10;
429
430 test.expect (a.value == c);
431 test.expect (a.get() == c);
432
433 a += 15;
434 c += 15;
435 test.expect (a.get() == c);
436 a.memoryBarrier();
437
438 a -= 5;
439 c -= 5;
440 test.expect (a.get() == c);
441
442 test.expect (++a == ++c);
443 ++a;
444 ++c;
445 test.expect (--a == --c);
446 test.expect (a.get() == c);
447 a.memoryBarrier();
448
449 testFloat (test);
450 }
451
452
453
454 static void testFloat (UnitTest& test)
455 {
456 Atomic<Type> a, b;
457 a = (Type) 101;
458 a.memoryBarrier();
459
460 /* These are some simple test cases to check the atomics - let me know
461 if any of these assertions fail on your system!
462 */
463 test.expect (exactlyEqual (a.get(), (Type) 101));
464 test.expect (! a.compareAndSetBool ((Type) 300, (Type) 200));
465 test.expect (exactlyEqual (a.get(), (Type) 101));
466 test.expect (a.compareAndSetBool ((Type) 200, a.get()));
467 test.expect (exactlyEqual (a.get(), (Type) 200));
468
469 test.expect (exactlyEqual (a.exchange ((Type) 300), (Type) 200));
470 test.expect (exactlyEqual (a.get(), (Type) 300));
471
472 b = a;
473 test.expect (exactlyEqual (b.get(), a.get()));
474 }
475 };
476};
477
478 static AtomicTests atomicUnitTests;
479
480//==============================================================================
481 class ThreadLocalValueUnitTest final : public UnitTest,
482 private Thread
483{
484 public:
485 ThreadLocalValueUnitTest()
486 : UnitTest ("ThreadLocalValue", UnitTestCategories::threads),
487 Thread ("ThreadLocalValue Thread")
488 {}
489
490 void runTest() override
491 {
492 beginTest ("values are thread local");
493
494 {
495 ThreadLocalValue<int> threadLocal;
496
497 sharedThreadLocal = &threadLocal;
498
499 sharedThreadLocal.get()->get() = 1;
500
501 startThread();
502 signalThreadShouldExit();
503 waitForThreadToExit (-1);
504
505 mainThreadResult = sharedThreadLocal.get()->get();
506
507 expectEquals (mainThreadResult.get(), 1);
508 expectEquals (auxThreadResult.get(), 2);
509 }
510
511 beginTest ("values are per-instance");
512
513 {
514 ThreadLocalValue<int> a, b;
515
516 a.get() = 1;
517 b.get() = 2;
518
519 expectEquals (a.get(), 1);
520 expectEquals (b.get(), 2);
521 }
522 }
523
524 private:
525 Atomic<int> mainThreadResult, auxThreadResult;
526 Atomic<ThreadLocalValue<int>*> sharedThreadLocal;
527
528 void run() override
529 {
530 sharedThreadLocal.get()->get() = 2;
531 auxThreadResult = sharedThreadLocal.get()->get();
532 }
533};
534
535ThreadLocalValueUnitTest threadLocalValueUnitTest;
536
537#endif
538
539} // namespace juce
juce::GenericScopedLock
Definition juce_ScopedLock.h:55
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::ReferenceCountedObjectPtr::get
ReferencedType * get() const noexcept
Definition juce_ReferenceCountedObject.h:381
juce::ReferenceCountedObject
Definition juce_ReferenceCountedObject.h:66
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::String::isNotEmpty
bool isNotEmpty() const noexcept
Definition juce_String.h:316
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
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::WaitableEvent::signal
void signal() const
Definition juce_WaitableEvent.cpp:57
juce::WaitableEvent::wait
bool wait(double timeOutMilliseconds=-1.0) const
Definition juce_WaitableEvent.cpp:31
juce::Thread::RealtimeOptions
Definition juce_Thread.h:77