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runtime: in exitsyscall, avoid confusing garbage collector

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R=r
CC=golang-dev
https://golang.org/cl/178046
This commit is contained in:
Russ Cox 2009-12-14 19:06:20 -08:00
parent 31de4d4c5d
commit 19c18358ca
1 changed files with 6 additions and 1 deletions
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7
src/pkg/runtime/proc.c
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@ -566,14 +566,19 @@ runtime·exitsyscall(void)
unlock(&sched); unlock(&sched);
return; return;
} }
g->status = Grunning;
sched.msyscall--; sched.msyscall--;
sched.mcpu++; sched.mcpu++;
// Fast path - if there's room for this m, we're done. // Fast path - if there's room for this m, we're done.
if(sched.mcpu <= sched.mcpumax) { if(sched.mcpu <= sched.mcpumax) {
g->status = Grunning;
unlock(&sched); unlock(&sched);
return; return;
} }
// Tell scheduler to put g back on the run queue:
// mostly equivalent to g->status = Grunning,
// but keeps the garbage collector from thinking
// that g is running right now, which it's not.
g->readyonstop = 1;
unlock(&sched); unlock(&sched);
// Slow path - all the cpus are taken. // Slow path - all the cpus are taken.