trace.GoSched()
		}
		casgstatus(gp, _Grunning, _Grunnable)
		if trace.ok() {
			traceRelease(trace)
		}
		dropg()
		lock(&sched.lock)
		globrunqput(gp)
		unlock(&sched.lock)

		trace = traceAcquire()
		casgstatus(callingG, _Gwaiting, _Grunnable)
		if trace.ok() {
			trace.GoUnpark(callingG, 0)
			traceRelease(trace)
		}
		execute(callingG, true)
	})
}

		trace.GCSweepDone()
		traceDone = true
		traceRelease(trace)
	}

	// We failed to get a span from the mcentral so get one from mheap.
	s = c.grow()
	if s == nil {
		return nil
	}

	// At this point s is a span that should have free slots.
havespan:
	if !traceDone {
		trace := traceAcquire()
		if trace.ok() {
			trace.GCSweepDone()
			traceRelease(trace)
		}
	}

			// reads to avoid frequent wakeups.
			trace.cpuSleep.sleep(100_000_000)

			tl := traceAcquire()
			if !tl.ok() {
				// Tracing disabled.
				break
			}
			keepGoing := traceReadCPU(tl.gen)
			traceRelease(tl)
			if !keepGoing {
				break
			}
		}
		done <- struct{}{}
	}()
	trace.cpuLogDone = done
}

// traceStopReadCPU blocks until the trace CPU reading goroutine exits.
//

			}
			abits.advance()
		}
	}

	// Write out all the goroutine stacks.
	forEachGRace(func(gp *g) {
		trace.GoroutineStackExists(gp.stack.lo, gp.stack.hi-gp.stack.lo)
	})
	traceRelease(trace)
}

func traceSpanTypeAndClass(s *mspan) traceArg {
	if s.state.get() == mSpanInUse {
		return traceArg(s.spanclass) << 1
	}
	return traceArg(1)
}

	}

	// Donate locked state.
	if locked {
		mp.lockedg.set(gnext)
		gnext.lockedm.set(mp)
	}

	// Release the trace locker. We've completed all the necessary transitions..
	if trace.ok() {
		traceRelease(trace)
	}

	// Switch to gnext. Does not return.
	gogo(&gnext.sched)

package race

import (
	"runtime"
	"unsafe"
)

const Enabled = true

func Acquire(addr unsafe.Pointer) {
	runtime.RaceAcquire(addr)
}

func Release(addr unsafe.Pointer) {
	runtime.RaceRelease(addr)
}

func ReleaseMerge(addr unsafe.Pointer) {
	runtime.RaceReleaseMerge(addr)
}

func Disable() {
	runtime.RaceDisable()
}

func Enable() {
	runtime.RaceEnable()
}

func raceacquireg(gp *g, addr unsafe.Pointer)                               { throw("race") }
func raceacquirectx(racectx uintptr, addr unsafe.Pointer)                   { throw("race") }
func racerelease(addr unsafe.Pointer)                                       { throw("race") }
func racereleaseg(gp *g, addr unsafe.Pointer)                               { throw("race") }

	// This would more properly use &getg().labels as the sync address,
	// but we do the read in a signal handler and can't call the race runtime then.
	//
	// This uses racereleasemerge rather than just racerelease so
	// the acquire in profBuf.read synchronizes with *all* prior
	// setProfLabel operations, not just the most recent one. This
	// is important because profBuf.read will observe different