move midi_read to own thread

Makefile

 src = $(wildcard *.c)
 obj = $(src:.c=.o)
 
-LDFLAGS = -lasound
+LDFLAGS = -lasound -lpthread
 
 $(exe): $(obj)
 	$(CC) -o $@ $^ $(LDFLAGS)

main.c

  *
  */
 #include <alsa/asoundlib.h>
+#include <pthread.h>             /* for threading        */
+
 
 // function declarations:
-void alsa_error(const char *format, ...);
+void     alsa_error           (const char *format, ...);
+void*    midiinfunction       (void * arg);
 
 int main(int argc, char *argv[]) {
   int status;
   int mode = SND_RAWMIDI_SYNC;
+  pthread_t midiinthread;
   snd_rawmidi_t* midiin = NULL;
   const char* portname = "virtual";
 
     exit(1);
   }
 
+  status = pthread_create(&midiinthread, NULL, midiinfunction, midiin);
+  
+  pthread_join(midiinthread, NULL);
+
+  snd_rawmidi_close(midiin);
+  midiin=NULL;
+  
+  return 0;
+}
+
+
+//////////////////////////////
+//
+// midiinfunction -- Thread function which waits around until a MIDI 
+//      input byte arrives and then react correspondingly
+//
+
+void *midiinfunction(void *arg) {
+  snd_rawmidi_t* midiin = (snd_rawmidi_t*)arg;
+  int status;
   int i = 0;
   char buffer[3];
   unsigned char message[3];
     printf("%d: %x %x %x\n", status, message[0], message[1], message[2]);
     fflush(stdout);
   }
-
-  snd_rawmidi_close(midiin);
-  midiin=NULL;
-  
-  return 0;
 }