// implement profiling at a rate of hz.
// No changes required on Unix systems when using setitimer.
func setThreadCPUProfilerHz(hz int32) {
	getg().m.profilehz = hz
}

func sigpipe() {
	if signal_ignored(_SIGPIPE) || sigsend(_SIGPIPE) {
		return
	}
	dieFromSignal(_SIGPIPE)
}

// doSigPreempt handles a preemption signal on gp.
func doSigPreempt(gp *g, ctxt *sigctxt) {