comparison core/RTAudio.cpp @ 381:a0698d523a6a prerelease

Added check for already-running Bela process.

 //
 // Returns 0 on success.
 
 int Bela_initAudio(BelaInitSettings *settings, void *userData)
 {
+	// First check if there's a Bela program already running on the board.
+	// We can't have more than one instance at a time, but we can tell via
+	// the Xenomai task info. We expect the rt_task_bind call to fail so if it
+	// doesn't then it means something else is running.
+	RT_TASK otherBelaTask;
+	int returnVal = rt_task_bind(&otherBelaTask, gRTAudioThreadName, TM_NONBLOCK);
+	if(returnVal == 0) {
+		cout << "Error: Bela is already running in another process. Cannot start.\n";
+		rt_task_unbind(&otherBelaTask);
+		return -1;
+	}
+	else if(returnVal != -EWOULDBLOCK && returnVal != -ETIMEDOUT) {
+		cout << "Error " << returnVal << " occurred determining if another Bela task is running.\n";
+		return -1;
+	}
+	
 	// Sanity checks
 	if(settings->pruNumber < 0 || settings->pruNumber > 1) {
 		cout << "Invalid PRU number " << settings->pruNumber << endl;
 		return -1;
 	}