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juce_MessageManager.h
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 class MessageManagerLock;
27 class ThreadPoolJob;
28 class ActionListener;
29 class ActionBroadcaster;
30
31//==============================================================================
33 using MessageCallbackFunction = void* (void* userData);
34
35
36//==============================================================================
44 class JUCE_API MessageManager final
45{
46 public:
47 //==============================================================================
49 static MessageManager* getInstance();
50
52 static MessageManager* getInstanceWithoutCreating() noexcept;
53
57 static void deleteInstance();
58
59 //==============================================================================
67 void runDispatchLoop();
68
76 void stopDispatchLoop();
77
80 bool hasStopMessageBeenSent() const noexcept { return quitMessagePosted.get() != 0; }
81
82 #if JUCE_MODAL_LOOPS_PERMITTED
88 bool runDispatchLoopUntil (int millisecondsToRunFor);
89 #endif
90
91 //==============================================================================
97 static bool callAsync (std::function<void()> functionToCall);
98
117 void* callFunctionOnMessageThread (MessageCallbackFunction* callback, void* userData);
118
120 bool isThisTheMessageThread() const noexcept;
121
127 void setCurrentThreadAsMessageThread();
128
134 Thread::ThreadID getCurrentMessageThread() const noexcept { return messageThreadId; }
135
143 bool currentThreadHasLockedMessageManager() const noexcept;
144
148 static bool existsAndIsLockedByCurrentThread() noexcept;
149
153 static bool existsAndIsCurrentThread() noexcept;
154
155 //==============================================================================
162 static void broadcastMessage (const String& messageText);
163
171 void registerBroadcastListener (ActionListener* listener);
172
174 void deregisterBroadcastListener (ActionListener* listener);
175
176 //==============================================================================
181 class JUCE_API MessageBase : public ReferenceCountedObject
182 {
183 public:
184 MessageBase() = default;
185 ~MessageBase() override = default;
186
187 virtual void messageCallback() = 0;
188 bool post();
189
190 using Ptr = ReferenceCountedObjectPtr<MessageBase>;
191
192 JUCE_DECLARE_NON_COPYABLE (MessageBase)
193 };
194
195 //==============================================================================
199 class JUCE_API Lock
200 {
201 public:
209 Lock();
210
212 ~Lock();
213
226 void enter() const noexcept;
227
271 bool tryEnter() const noexcept;
272
276 void exit() const noexcept;
277
284 void abort() const noexcept;
285
286 //==============================================================================
288 using ScopedLockType = GenericScopedLock<Lock>;
289
291 using ScopedUnlockType = GenericScopedUnlock<Lock>;
292
294 using ScopedTryLockType = GenericScopedTryLock<Lock>;
295
296 private:
297 struct BlockingMessage;
298 friend class ReferenceCountedObjectPtr<BlockingMessage>;
299
300 bool exclusiveTryAcquire (bool) const noexcept;
301 bool tryAcquire (bool) const noexcept;
302
303 void setAcquired (bool success) const noexcept;
304
305 //==============================================================================
306 // This mutex is used to make this lock type behave like a normal mutex.
307 // If multiple threads call enter() simultaneously, only one will succeed in gaining
308 // this mutex. The mutex is released again in exit().
309 mutable CriticalSection entryMutex;
310
311 // This mutex protects the other data members of the lock from concurrent access, which
312 // happens when the BlockingMessage calls setAcquired to indicate that the lock was gained.
313 mutable std::mutex mutex;
314 mutable ReferenceCountedObjectPtr<BlockingMessage> blockingMessage;
315 mutable std::condition_variable condvar;
316 mutable bool abortWait = false, acquired = false;
317 };
318
319 //==============================================================================
320 #ifndef DOXYGEN
321 // Internal methods - do not use!
322 void deliverBroadcastMessage (const String&);
323 ~MessageManager() noexcept;
324 #endif
325
326 private:
327 //==============================================================================
328 MessageManager() noexcept;
329
330 static MessageManager* instance;
331
332 friend class MessageBase;
333 class QuitMessage;
334 friend class QuitMessage;
335 friend class MessageManagerLock;
336
337 std::unique_ptr<ActionBroadcaster> broadcaster;
338 Atomic<int> quitMessagePosted { 0 }, quitMessageReceived { 0 };
339 Thread::ThreadID messageThreadId;
340 Atomic<Thread::ThreadID> threadWithLock;
341 mutable std::mutex messageThreadIdMutex;
342
343 static bool postMessageToSystemQueue (MessageBase*);
344 static void* exitModalLoopCallback (void*);
345 static void doPlatformSpecificInitialisation();
346 static void doPlatformSpecificShutdown();
347
348 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MessageManager)
349};
350
351
352//==============================================================================
389 class JUCE_API MessageManagerLock : private Thread::Listener
390{
391 public:
392 //==============================================================================
434 MessageManagerLock (Thread* threadToCheckForExitSignal = nullptr);
435
436 //==============================================================================
442 MessageManagerLock (ThreadPoolJob* jobToCheckForExitSignal);
443
444 //==============================================================================
450 ~MessageManagerLock() override;
451
452 //==============================================================================
456 bool lockWasGained() const noexcept { return locked; }
457
458 private:
459 //==============================================================================
460 MessageManager::Lock mmLock;
461 bool locked;
462
463 //==============================================================================
464 bool attemptLock (Thread*, ThreadPoolJob*);
465 void exitSignalSent() override;
466
467 JUCE_DECLARE_NON_COPYABLE (MessageManagerLock)
468};
469
470//==============================================================================
476#define JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED \
477 jassert (juce::MessageManager::existsAndIsLockedByCurrentThread());
478
484#define JUCE_ASSERT_MESSAGE_THREAD \
485 jassert (juce::MessageManager::existsAndIsCurrentThread());
486
490#define JUCE_ASSERT_MESSAGE_MANAGER_EXISTS \
491 jassert (juce::MessageManager::getInstanceWithoutCreating() != nullptr);
492
493
494} // namespace juce
juce::ActionBroadcaster
Definition juce_ActionBroadcaster.h:37
juce::ActionListener
Definition juce_ActionListener.h:35
juce::CriticalSection
Definition juce_CriticalSection.h:43
juce::GenericScopedLock
Definition juce_ScopedLock.h:55
juce::GenericScopedTryLock
Definition juce_ScopedLock.h:198
juce::GenericScopedUnlock
Definition juce_ScopedLock.h:126
juce::MessageManagerLock
Definition juce_MessageManager.h:390
juce::MessageManagerLock::lockWasGained
bool lockWasGained() const noexcept
Definition juce_MessageManager.h:456
juce::MessageManager::Lock
Definition juce_MessageManager.h:200
juce::MessageManager::MessageBase
Definition juce_MessageManager.h:182
juce::MessageManager
Definition juce_MessageManager.h:45
juce::MessageManager::hasStopMessageBeenSent
bool hasStopMessageBeenSent() const noexcept
Definition juce_MessageManager.h:80
juce::ReferenceCountedObjectPtr
Definition juce_ReferenceCountedObject.h:247
juce::ReferenceCountedObject
Definition juce_ReferenceCountedObject.h:66
juce::String
Definition juce_String.h:53
juce::ThreadPoolJob
Definition juce_ThreadPool.h:45
juce::Thread::Listener
Definition juce_Thread.h:396
juce::Thread
Definition juce_Thread.h:43
juce::Atomic
Definition juce_Atomic.h:42