shithub: riscv

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qio: revert the change, i was not reading the code right

actually, the initial condition for blocking
was q->len/2 >= q->limit, which menas the queue
grew over TWICE the size. thich makes this
heuristic kick in later, which i think was
fine. so revert and put comment to not getting
confused again. sorry :(

--- a/sys/src/9/port/qio.c

+++ b/sys/src/9/port/qio.c

@@ -1163,9 +1163,14 @@

 	QDEBUG if(!islo())

 		print("qwrite hi %#p\n", getcallerpc(&q));

-

-	/* stop queue bloat before allocating blocks */

-	if(q->len >= q->limit && q->noblock == 0 && q->bypass == nil){

+	/*

+	 * when the queue length grew over twice the limit,

+	 * block here before allocating more blocks.

+	 * this can happen when qflow() is getting

+	 * interrupted by notes, preventing effective

+	 * flow control.

+	 */

+	if(q->len/2 >= q->limit && q->noblock == 0 && q->bypass == nil){

 		while(waserror()){

 			if(up->procctl == Proc_exitme || up->procctl == Proc_exitbig)

 				error(Egreg);