[0.99.13] account for late poll() in ALSA driver

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@805 0c269be4-1314-0410-8aa9-9f06e86f4224

configure.ac

@@ -15,7 +15,7 @@ dnl                 changes are made
 dnl ---
 JACK_MAJOR_VERSION=0
 JACK_MINOR_VERSION=99
-JACK_MICRO_VERSION=12
+JACK_MICRO_VERSION=13
 
 dnl ---
 dnl HOWTO: updating the jack protocol version

drivers/alsa/alsa_driver.c

@@ -1187,6 +1187,16 @@ alsa_driver_wait (alsa_driver_t *driver, int extra_fd, int *status, float
 
 		poll_enter = jack_get_microseconds ();
 
+		if (poll_enter > driver->poll_next) {
+			/*
+			 * This processing cycle was delayed past the
+			 * next due interrupt!  Do not account this as
+			 * a wakeup delay:
+			 */
+			driver->poll_next = 0;
+			driver->poll_late++;
+		}
+
 		if (poll (driver->pfd, nfds, driver->poll_timeout) < 0) {
 
 			if (errno == EINTR) {
@@ -1924,6 +1934,7 @@ alsa_driver_new (char *name, char *playback_alsa_device,
 	pthread_mutex_init (&driver->clock_sync_lock, 0);
 	driver->clock_sync_listeners = 0;
 
+	driver->poll_late = 0;
 	driver->xrun_count = 0;
 	driver->process_count = 0;
 

drivers/alsa/alsa_driver.h

@@ -135,6 +135,7 @@ typedef struct {
     int running;
     int run;
 
+    int poll_late;
     int xrun_count;
     int process_count;