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runtime: introduce preemption function (not used for now)
This is part of preemptive scheduler. R=golang-dev, cshapiro, iant CC=golang-dev https://golang.org/cl/9843046
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@ -110,6 +110,8 @@ static G* globrunqget(P*);
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static P* pidleget(void);
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static void pidleput(P*);
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static void injectglist(G*);
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static void preemptall(void);
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static void preemptone(P*);
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// The bootstrap sequence is:
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//
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@ -2073,6 +2075,45 @@ retake(uint32 *ticks)
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return n;
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}
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// Tell all goroutines that they have been preempted and they should stop.
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// This function is purely best-effort. It can fail to inform a goroutine if a
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// processor just started running it.
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// No locks need to be held.
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static void
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preemptall(void)
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{
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P *p;
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int32 i;
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for(i = 0; i < runtime·gomaxprocs; i++) {
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p = runtime·allp[i];
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if(p == nil || p->status != Prunning)
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continue;
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preemptone(p);
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}
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}
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// Tell the goroutine running on processor P to stop.
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// This function is purely best-effort. It can incorrectly fail to inform the
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// goroutine. It can send inform the wrong goroutine. Even if it informs the
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// correct goroutine, that goroutine might ignore the request if it is
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// simultaneously executing runtime·newstack.
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// No lock needs to be held.
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static void
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preemptone(P *p)
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{
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M *mp;
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G *gp;
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mp = p->m;
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if(mp == nil || mp == m)
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return;
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gp = mp->curg;
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if(gp == nil || gp == mp->g0)
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return;
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gp->stackguard0 = StackPreempt;
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}
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// Put mp on midle list.
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// Sched must be locked.
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static void
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@ -105,4 +105,9 @@ enum {
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// The actual size can be smaller than this but cannot be larger.
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// Checked in proc.c's runtime.malg.
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StackTop = 72,
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// Goroutine preemption request.
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// Stored into g->stackguard0 to cause split stack check failure.
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// Must be greater than any real sp.
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StackPreempt = (uintptr)(intptr)0xfffffade,
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};
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