fixed a small problem when mac plugins are opened and closed quickly by the host

build/macosx/platform_specific_code/juce_mac_MessageManager.mm

@@ -112,6 +112,9 @@ using namespace JUCE_NAMESPACE;
 
 #define JuceAppDelegate MakeObjCClassName(JuceAppDelegate)
 
+static int numPendingMessages = 0;
+static bool flushingMessages = false;
+
 @interface JuceAppDelegate   : NSObject
 {
 @private
@@ -139,6 +142,8 @@ using namespace JUCE_NAMESPACE;
     [super init];
 
     redirector = new AppDelegateRedirector();
+    numPendingMessages = 0;
+    flushingMessages = false;
 
     NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
 
@@ -205,11 +210,13 @@ using namespace JUCE_NAMESPACE;
 
 - (void) customEvent: (id) n
 {
+    atomicDecrement (numPendingMessages);
+
     NSData* data = (NSData*) n;
     void* message = 0;
     [data getBytes: &message length: sizeof (message)];
 
-    if (message != 0)
+    if (message != 0 && ! flushingMessages)
         redirector->deliverMessage (message);
 
     [data release];
@@ -303,12 +310,25 @@ void MessageManager::doPlatformSpecificShutdown()
 {
     [[NSRunLoop currentRunLoop] cancelPerformSelectorsWithTarget: juceAppDelegate];
     [[NSNotificationCenter defaultCenter] removeObserver: juceAppDelegate];
+
+    // Annoyingly, cancelPerformSelectorsWithTarget can't actually cancel the messages
+    // sent by performSelectorOnMainThread, so need to manually flush these before quitting..
+    for (int i = 100; --i >= 0 && numPendingMessages > 0;)
+    {
+        flushingMessages = true;
+        getInstance()->runDispatchLoopUntil (10);
+    }
+
+    jassert (numPendingMessages == 0); // failed to get all the pending messages cleared before quitting..
+    
     [juceAppDelegate release];
     juceAppDelegate = 0;
 }
 
 bool juce_postMessageToSystemQueue (void* message)
 {
+    atomicIncrement (numPendingMessages);
+
     [juceAppDelegate performSelectorOnMainThread: @selector (customEvent:)
                      withObject: (id) [[NSData alloc] initWithBytes: &message
                                                              length: (int) sizeof (message)]

extras/juce demo/build/macosx/jucedemo.xcodeproj/project.pbxproj

@@ -30,6 +30,7 @@
 		847F4EB90E8BA9DD00F64426 /* BinaryData.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 847F4EB10E8BA9DD00F64426 /* BinaryData.cpp */; };
 		847F4EBA0E8BA9DD00F64426 /* juce_LibrarySource.mm in Sources */ = {isa = PBXBuildFile; fileRef = 847F4EB40E8BA9DD00F64426 /* juce_LibrarySource.mm */; };
 		847F4EBB0E8BA9DD00F64426 /* MainDemoWindow.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 847F4EB60E8BA9DD00F64426 /* MainDemoWindow.cpp */; };
+		84FFCF3B0EDAFE7F007D5302 /* Carbon.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 84FFCF3A0EDAFE7F007D5302 /* Carbon.framework */; };
 		8D11072F0486CEB800E47090 /* Cocoa.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1058C7A1FEA54F0111CA2CBB /* Cocoa.framework */; };
 /* End PBXBuildFile section */
 
@@ -64,6 +65,7 @@
 		847F4EB50E8BA9DD00F64426 /* jucedemo_headers.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = jucedemo_headers.h; path = ../../src/jucedemo_headers.h; sourceTree = SOURCE_ROOT; };
 		847F4EB60E8BA9DD00F64426 /* MainDemoWindow.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MainDemoWindow.cpp; path = ../../src/MainDemoWindow.cpp; sourceTree = SOURCE_ROOT; };
 		847F4EB70E8BA9DD00F64426 /* MainDemoWindow.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = MainDemoWindow.h; path = ../../src/MainDemoWindow.h; sourceTree = SOURCE_ROOT; };
+		84FFCF3A0EDAFE7F007D5302 /* Carbon.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Carbon.framework; path = /System/Library/Frameworks/Carbon.framework; sourceTree = "<absolute>"; };
 		8D1107310486CEB800E47090 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		8D1107320486CEB800E47090 /* jucedemo.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = jucedemo.app; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
@@ -82,6 +84,7 @@
 				841FE4410E8ABDD4003C3263 /* WebKit.framework in Frameworks */,
 				847F4D900E8AC35C00F64426 /* QTKit.framework in Frameworks */,
 				8450577A0EB52CE500029DFF /* QuickTime.framework in Frameworks */,
+				84FFCF3B0EDAFE7F007D5302 /* Carbon.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -134,6 +137,7 @@
 		29B97323FDCFA39411CA2CEA /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				84FFCF3A0EDAFE7F007D5302 /* Carbon.framework */,
 				1058C7A1FEA54F0111CA2CBB /* Cocoa.framework */,
 				841FE4360E8ABDD4003C3263 /* CoreAudio.framework */,
 				841FE4370E8ABDD4003C3263 /* CoreMIDI.framework */,

extras/juce demo/build/win32_vc8/jucedemo.sln

@@ -2,9 +2,6 @@
 Microsoft Visual Studio Solution File, Format Version 9.00
 # Visual Studio 2005
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "jucedemo", "jucedemo.vcproj", "{050D65C2-17C4-4EE1-ABCE-BEA9DA83D77A}"
-	ProjectSection(ProjectDependencies) = postProject
-		{AE232C11-D91C-4CA1-B24E-8B11A52EFF26} = {AE232C11-D91C-4CA1-B24E-8B11A52EFF26}
-	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "JUCE", "..\..\..\..\build\win32\vc8\JUCE.vcproj", "{AE232C11-D91C-4CA1-B24E-8B11A52EFF26}"
 EndProject

juce_amalgamated.cpp

@@ -268525,6 +268525,9 @@ using namespace JUCE_NAMESPACE;
 
 #define JuceAppDelegate MakeObjCClassName(JuceAppDelegate)
 
+static int numPendingMessages = 0;
+static bool flushingMessages = false;
+
 @interface JuceAppDelegate   : NSObject
 {
 @private
@@ -268552,6 +268555,8 @@ using namespace JUCE_NAMESPACE;
     [super init];
 
     redirector = new AppDelegateRedirector();
+    numPendingMessages = 0;
+    flushingMessages = false;
 
     NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
 
@@ -268618,11 +268623,13 @@ using namespace JUCE_NAMESPACE;
 
 - (void) customEvent: (id) n
 {
+    atomicDecrement (numPendingMessages);
+
     NSData* data = (NSData*) n;
     void* message = 0;
     [data getBytes: &message length: sizeof (message)];
 
-    if (message != 0)
+    if (message != 0 && ! flushingMessages)
         redirector->deliverMessage (message);
 
     [data release];
@@ -268715,12 +268722,25 @@ void MessageManager::doPlatformSpecificShutdown()
 {
     [[NSRunLoop currentRunLoop] cancelPerformSelectorsWithTarget: juceAppDelegate];
     [[NSNotificationCenter defaultCenter] removeObserver: juceAppDelegate];
+
+    // Annoyingly, cancelPerformSelectorsWithTarget can't actually cancel the messages
+    // sent by performSelectorOnMainThread, so need to manually flush these before quitting..
+    for (int i = 100; --i >= 0 && numPendingMessages > 0;)
+    {
+        flushingMessages = true;
+        getInstance()->runDispatchLoopUntil (10);
+    }
+
+    jassert (numPendingMessages == 0); // failed to get all the pending messages cleared before quitting..
+
     [juceAppDelegate release];
     juceAppDelegate = 0;
 }
 
 bool juce_postMessageToSystemQueue (void* message)
 {
+    atomicIncrement (numPendingMessages);
+
     [juceAppDelegate performSelectorOnMainThread: @selector (customEvent:)
                      withObject: (id) [[NSData alloc] initWithBytes: &message
                                                              length: (int) sizeof (message)]

juce_amalgamated.h

@@ -27499,6 +27499,10 @@ public:
         filter will return an empty buffer, but won't block the audio thread like it would
         do if you use the getCallbackLock() critical section to synchronise access.
 
+        If you're going to use this, your processBlock() method must call isSuspended() and
+        check whether it's suspended or not. If it is, then it should skip doing any real
+        processing, either emitting silence or passing the input through unchanged.
+
         @see getCallbackLock
     */
     void suspendProcessing (const bool shouldBeSuspended);

src/juce_appframework/audio/processors/juce_AudioProcessor.h

@@ -276,6 +276,10 @@ public:
         filter will return an empty buffer, but won't block the audio thread like it would
         do if you use the getCallbackLock() critical section to synchronise access.
 
+        If you're going to use this, your processBlock() method must call isSuspended() and
+        check whether it's suspended or not. If it is, then it should skip doing any real
+        processing, either emitting silence or passing the input through unchanged.
+
         @see getCallbackLock
     */
     void suspendProcessing (const bool shouldBeSuspended);