kernel: cleanup exit()/shutdown()/reboot() code

introduce cpushutdown() function that does the common
operation of initiating shutdown, returning once all
cpu's got the message and are about to shutdown. this
avoids duplicated code which isnt really machine specific.

automatic reboot on panic only when *debug= is not set
and the machine is a cpu server or has no display,
otherwise just hang.

2 files changed, 2 insertions, 33 deletions

diff --git a/sys/src/9/mtx/dat.h b/sys/src/9/mtx/dat.h
index 294bca8c5..4e3c7414d 100644
--- a/sys/src/9/mtx/dat.h
+++ b/sys/src/9/mtx/dat.h
@@ -183,7 +183,6 @@ struct
 	Lock;
 	short	machs;
 	short	exiting;
-	short	ispanic;
 }active;
 
 /*
diff --git a/sys/src/9/mtx/main.c b/sys/src/9/mtx/main.c
index 491580101..f3c5a1568 100644
--- a/sys/src/9/mtx/main.c
+++ b/sys/src/9/mtx/main.c
@@ -211,42 +211,12 @@ userinit(void)
 void
 reboot(void*, void*, ulong)
 {
-	exit(0);
 }
 
 void
-exit(int ispanic)
+exit(int)
 {
-	int ms, once;
-
-	lock(&active);
-	if(ispanic)
-		active.ispanic = ispanic;
-	else if(m->machno == 0 && (active.machs & (1<<m->machno)) == 0)
-		active.ispanic = 0;
-	once = active.machs & (1<<m->machno);
-	active.machs &= ~(1<<m->machno);
-	active.exiting = 1;
-	unlock(&active);
-
-	if(once)
-		print("cpu%d: exiting\n", m->machno);
-	spllo();
-	for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
-		delay(TK2MS(2));
-		if(active.machs == 0 && consactive() == 0)
-			break;
-	}
-
-	if(active.ispanic && m->machno == 0){
-		if(cpuserver)
-			delay(10000);
-		else if(conf.monitor)
-			for(;;);
-	}
-	else
-		delay(1000);
-
+	cpushutdown();
 	watchreset();
 }