# HG changeset patch
# User andrewm
# Date 1465770037 -3600
# Node ID a0698d523a6ae2fb06010c4612bf4ad45e5b364f
# Parent  9dc5a0ccad2569e8d8eb3ca0c1ef4167005d38cb
Added check for already-running Bela process.

diff -r 9dc5a0ccad25 -r a0698d523a6a core/RTAudio.cpp
--- a/core/RTAudio.cpp	Sun Jun 12 23:03:57 2016 +0100
+++ b/core/RTAudio.cpp	Sun Jun 12 23:20:37 2016 +0100
@@ -99,6 +99,22 @@
 
 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;