Add and use Mutex::wasTryLockCalled() in ScopedProcessLocker

source/backend/plugin/CarlaPlugin.cpp

@@ -1505,7 +1505,8 @@ CarlaPlugin::ScopedProcessLocker::~ScopedProcessLocker()
 
     if (kBlock)
     {
-        kPlugin->kData->needsReset = true;
+        if (kPlugin->kData->mutex.wasTryLockCalled())
+            kPlugin->kData->needsReset = true;
         kPlugin->kData->mutex.unlock();
     }
 }

source/utils/CarlaMutex.hpp

@@ -35,6 +35,7 @@ class CarlaMutex
 {
 public:
     CarlaMutex()
+        : fTryLockCalled(false)
     {
 #ifndef CPP11_MUTEX
         pthread_mutex_init(&pmutex, nullptr);
@@ -59,6 +60,8 @@ public:
 
     bool tryLock()
     {
+        fTryLockCalled = true;
+
 #ifdef CPP11_MUTEX
         return cmutex.try_lock();
 #else
@@ -75,6 +78,13 @@ public:
 #endif
     }
 
+    bool wasTryLockCalled()
+    {
+        const bool ret = fTryLockCalled;
+        fTryLockCalled = false;
+        return ret;
+    }
+
     class ScopedLocker
     {
     public:
@@ -102,6 +112,7 @@ private:
 #else
     pthread_mutex_t pmutex;
 #endif
+    bool fTryLockCalled;
 
     CARLA_PREVENT_HEAP_ALLOCATION
     CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CarlaMutex)