// transition and handles it specially based on the
		// wait reason.
		casGToWaitingForGC(gp, _Grunning, reason)
		forEachPInternal(fn)
		casgstatus(gp, _Gwaiting, _Grunning)
	})
}

// forEachPInternal calls fn(p) for every P p when p reaches a GC safe point.
// It is the internal implementation of forEachP.
//