From: David van Moolenbroek <david@minix3.org>
Date: Sun, 1 Aug 2010 22:07:46 +0000 (+0000)
Subject: libdriver: allow driver to break out of message loop
X-Git-Tag: v3.1.8~124
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/verify-sign/tz-link.htm?a=commitdiff_plain;h=20eced94e726a438fa69f52061303062a8407b69;p=minix.git

libdriver: allow driver to break out of message loop
---

diff --git a/include/minix/driver.h b/include/minix/driver.h
index b5272b810..71b888a9c 100644
--- a/include/minix/driver.h
+++ b/include/minix/driver.h
@@ -67,6 +67,7 @@ _PROTOTYPE( void driver_announce, (void) );
 _PROTOTYPE( int driver_receive, (endpoint_t src, message *m_ptr,
 	int *status_ptr) );
 _PROTOTYPE( int driver_receive_mq, (message *m_ptr, int *status_ptr) );
+_PROTOTYPE( void driver_terminate, (void) );
 _PROTOTYPE( void driver_task, (struct driver *dr, int type) );
 _PROTOTYPE( int driver_mq_queue, (message *m_ptr, int status) );
 _PROTOTYPE( void driver_init_buffer, (void) );
diff --git a/lib/libdriver/driver.c b/lib/libdriver/driver.c
index cb7655837..a6c3bfc8c 100644
--- a/lib/libdriver/driver.c
+++ b/lib/libdriver/driver.c
@@ -65,6 +65,7 @@ int device_caller;
 PRIVATE mq_t *queue_head = NULL;
 PRIVATE int open_devs[MAX_NR_OPEN_DEVICES];
 PRIVATE int next_open_devs_slot = 0;
+PRIVATE int driver_running;
 
 /*===========================================================================*
  *			     clear_open_devs				     *
@@ -324,6 +325,17 @@ int *status_ptr;
 	return driver_receive(ANY, m_ptr, status_ptr);
 }
 
+/*===========================================================================*
+ *				driver_terminate			     *
+ *===========================================================================*/
+PUBLIC void driver_terminate(void)
+{
+/* Break out of the main driver loop after finishing the current request.
+ */
+
+  driver_running = FALSE;
+}
+
 /*===========================================================================*
  *				driver_task				     *
  *===========================================================================*/
@@ -336,10 +348,12 @@ int type;		/* Driver type (DRIVER_STD or DRIVER_ASYN) */
   int r, proc_nr, ipc_status;
   message mess;
 
+  driver_running = TRUE;
+
   /* Here is the main loop of the disk task.  It waits for a message, carries
    * it out, and sends a reply.
    */
-  while (TRUE) {
+  while (driver_running) {
 	if ((r=driver_receive_mq(&mess, &ipc_status)) != OK)
 		panic("driver_receive_mq failed: %d", r);