From: Tomas Hruby <tom@minix3.org>
Date: Tue, 9 Feb 2010 15:22:43 +0000 (+0000)
Subject: No CLOCK task
X-Git-Tag: v3.1.7~300
X-Git-Url: http://zhaoyanbai.com/repos/Bv9ARM.ch04.html?a=commitdiff_plain;h=ebba20a65d3354c3b77d1e092b9ffa02862c6649;p=minix.git

No CLOCK task

- no kernel tasks are runnable

- clock initialization moved to the end of main()

- the rest of the body of clock_task() is moved to bsp_timer_int_handler() as
  for now we are going to handle this on the bootstrap cpu. A change later is
  possible.
---

diff --git a/kernel/clock.c b/kernel/clock.c
index a3f6e4c9b..7ffe414de 100644
--- a/kernel/clock.c
+++ b/kernel/clock.c
@@ -42,7 +42,6 @@
 
 /* Function prototype for PRIVATE functions.
  */ 
-FORWARD _PROTOTYPE( void init_clock, (void) );
 FORWARD _PROTOTYPE( void load_update, (void));
 
 /* The CLOCK's timers queue. The functions in <timers.h> operate on this. 
@@ -59,51 +58,10 @@ PRIVATE clock_t next_timeout;	/* realtime that next timer expires */
  */
 PRIVATE clock_t realtime = 0;		      /* real time clock */
 
-/*===========================================================================*
- *				clock_task				     *
- *===========================================================================*/
-PUBLIC void clock_task()
-{
-/* Main program of clock task. If the call is not HARD_INT it is an error.
- */
-  message m;       /* message buffer for both input and output */
-  int result;      /* result returned by the handler */
-
-  init_clock();    /* initialize clock task */
-    
-  /* Main loop of the clock task.  Get work, process it. Never reply. */
-  while(TRUE) {
-	/* Go get a message. */
-	result = receive(ANY, &m);
-
-	if(result != OK)
-		minix_panic("receive() failed", result);
-
-	/* Handle the request. Only clock ticks are expected. */
-	if (is_notify(m.m_type)) {
-		switch (_ENDPOINT_P(m.m_source)) {
-			case HARDWARE:
-				tmrs_exptimers(&clock_timers, realtime, NULL);
-				next_timeout = (clock_timers == NULL) ?
-					TMR_NEVER : clock_timers->tmr_exp_time;
-				break;
-			default:	/* illegal request type */
-				kprintf("CLOCK: illegal notify %d from %d.\n",
-					m.m_type, m.m_source);
-		}
-	}
-	else {
-		/* illegal request type */
-		kprintf("CLOCK: illegal request %d from %d.\n",
-			m.m_type, m.m_source);
-	}
-  }
-}
-
 /*===========================================================================*
  *				init_clock				     *
  *===========================================================================*/
-PRIVATE void init_clock()
+PUBLIC void clock_init()
 {
    
 	/* Set a watchdog timer to periodically balance the scheduling queues.
@@ -134,7 +92,9 @@ PUBLIC int bsp_timer_int_handler(void)
 
 	/* if a timer expired, notify the clock task */
 	if ((next_timeout <= realtime)) {
-		mini_notify(proc_addr(HARDWARE), CLOCK); /* send notification */
+		tmrs_exptimers(&clock_timers, realtime, NULL);
+		next_timeout = (clock_timers == NULL) ?
+			TMR_NEVER : clock_timers->tmr_exp_time;
 	}
 
 	if (do_serial_debug)
diff --git a/kernel/main.c b/kernel/main.c
index 0f67f0f96..d1f82a311 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -199,12 +199,8 @@ PUBLIC void main()
 	if(ip->flags & PROC_FULLVM)
 		RTS_SET(rp, RTS_VMINHIBIT);
 
-	/* Set ready. The HARDWARE task is never ready. */
-	if (rp->p_nr == HARDWARE) RTS_SET(rp, RTS_PROC_STOP);
-	/* IDLE task is never put on a run queue as it is never ready to run */
-	if (rp->p_nr == IDLE) RTS_SET(rp, RTS_PROC_STOP);
-	/* SYSTEM does not run anymore */
-	if (rp->p_nr == SYSTEM) RTS_SET(rp, RTS_PROC_STOP);
+	/* None of the kernel tasks run */
+	if (rp->p_nr < 0) RTS_SET(rp, RTS_PROC_STOP);
 	RTS_UNSET(rp, RTS_SLOT_FREE); /* remove RTS_SLOT_FREE and schedule */
 	alloc_segments(rp);
   }
@@ -214,6 +210,8 @@ PUBLIC void main()
 
   /* System and processes initialization */
   system_init();
+  /* Initialize timers handling */
+  clock_init();
 
 #if SPROFILE
   sprofiling = 0;      /* we're not profiling until instructed to */
diff --git a/kernel/proto.h b/kernel/proto.h
index 219333ff9..d856fcce8 100644
--- a/kernel/proto.h
+++ b/kernel/proto.h
@@ -12,7 +12,7 @@ struct proc;
 struct timer;
 
 /* clock.c */
-_PROTOTYPE( void clock_task, (void)					);
+_PROTOTYPE( void clock_init, (void) );
 _PROTOTYPE( clock_t get_uptime, (void)					);
 _PROTOTYPE( void set_timer, (struct timer *tp, clock_t t, tmr_func_t f)	);
 _PROTOTYPE( void reset_timer, (struct timer *tp)			);
diff --git a/kernel/table.c b/kernel/table.c
index 760d9328c..04d0f20d9 100644
--- a/kernel/table.c
+++ b/kernel/table.c
@@ -62,7 +62,7 @@ PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
 PUBLIC struct boot_image image[] = {
 /* process nr, pc, flags, qs,  queue, stack,   name */ 
 {IDLE,       NULL,     0,  0,      0, IDL_S, "idle"  },
-{CLOCK,clock_task,     0,  8, TASK_Q, TSK_S, "clock" },
+{CLOCK,      NULL,     0,  0,      0, IDL_S, "clock" },
 {SYSTEM,     NULL,     0,  0,      0, IDL_S, "system"},
 {HARDWARE,      0,     0,  8, TASK_Q, HRD_S, "kernel"},
 {PM_PROC_NR,    0,     0, 32,      4, 0,     "pm"    },