Use spin-locks for short-lived, non-recursive locking sequences

src/demod/DemodulatorThread.cpp

@@ -39,13 +39,13 @@ void DemodulatorThread::onBindOutput(std::string name, ThreadQueueBasePtr thread
     if (name == "AudioVisualOutput") {
         
         //protects because it may be changed at runtime
-        std::lock_guard < std::mutex > lock(m_mutexAudioVisOutputQueue);
+        std::lock_guard < SpinMutex > lock(m_mutexAudioVisOutputQueue);
 
         audioVisOutputQueue = std::static_pointer_cast<DemodulatorThreadOutputQueue>(threadQueue);
     }
 
     if (name == "AudioSink") {
-        std::lock_guard < std::mutex > lock(m_mutexAudioVisOutputQueue);
+        std::lock_guard < SpinMutex > lock(m_mutexAudioVisOutputQueue);
 
         audioSinkOutputQueue = std::static_pointer_cast<AudioThreadInputQueue>(threadQueue);
     }
@@ -247,7 +247,7 @@ void DemodulatorThread::run() {
         //variable, and works with it with now on until the next while-turn.
         DemodulatorThreadOutputQueuePtr localAudioVisOutputQueue = nullptr;
         {
-            std::lock_guard < std::mutex > lock(m_mutexAudioVisOutputQueue);
+            std::lock_guard < SpinMutex > lock(m_mutexAudioVisOutputQueue);
             localAudioVisOutputQueue = audioVisOutputQueue;
         }
 
@@ -336,7 +336,7 @@ void DemodulatorThread::run() {
         // Capture audioSinkOutputQueue state in a local variable
         DemodulatorThreadOutputQueuePtr localAudioSinkOutputQueue = nullptr;
         {
-            std::lock_guard < std::mutex > lock(m_mutexAudioVisOutputQueue);
+            std::lock_guard < SpinMutex > lock(m_mutexAudioVisOutputQueue);
             localAudioSinkOutputQueue = audioSinkOutputQueue;
         }
 

src/demod/DemodulatorThread.h

@@ -10,6 +10,7 @@
 #include "DemodDefs.h"
 #include "AudioThread.h"
 #include "Modem.h"
+#include "SpinMutex.h"
 
 #define DEMOD_VIS_SIZE 2048
 #define DEMOD_SIGNAL_MIN -30
@@ -70,5 +71,5 @@ protected:
     DemodulatorThreadOutputQueuePtr audioSinkOutputQueue = nullptr;
 
     //protects the audioVisOutputQueue dynamic binding change at runtime (in DemodulatorMgr)
-    std::mutex m_mutexAudioVisOutputQueue;
+    SpinMutex m_mutexAudioVisOutputQueue;
 };