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acme: use threadexitsall() to tear down mouse and keyboard procs on error

--- a/sys/src/cmd/acme/acme.c

+++ b/sys/src/cmd/acme/acme.c

@@ -167,19 +167,19 @@

 	cwarn = chancreate(sizeof(void*), 1);

 	if(cwait==nil || ccommand==nil || ckill==nil || cxfidalloc==nil || cxfidfree==nil || cerr==nil || cexit==nil || cwarn==nil){

 		fprint(2, "acme: can't create initial channels: %r\n");

-		exits("channels");

+		threadexitsall("channels");

 	}

 	mousectl = initmouse(nil, screen);

 	if(mousectl == nil){

 		fprint(2, "acme: can't initialize mouse: %r\n");

-		exits("mouse");

+		threadexitsall("mouse");

 	}

 	mouse = mousectl;

 	keyboardctl = initkeyboard(nil);

 	if(keyboardctl == nil){

 		fprint(2, "acme: can't initialize keyboard: %r\n");

-		exits("keyboard");

+		threadexitsall("keyboard");

 	}

 	mainpid = getpid();

 	plumbeditfd = plumbopen("edit", OREAD|OCEXEC);

-- 

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