name:  "heap",
	count: countHeap,
	write: writeHeap,
}

var allocsProfile = &Profile{
	name:  "allocs",
	count: countHeap, // identical to heap profile
	write: writeAlloc,
}

var blockProfile = &Profile{
	name:  "block",
	count: countBlock,
	write: writeBlock,
}

var mutexProfile = &Profile{
	name:  "mutex",
	count: countMutex,
	write: writeMutex,
}

func lockProfiles() {

	// to build the test in a way that supports the use of the flag.

	cf.StringVar(&testBench, "bench", "", "")
	cf.Bool("benchmem", false, "")
	cf.String("benchtime", "", "")
	cf.StringVar(&testBlockProfile, "blockprofile", "", "")
	cf.String("blockprofilerate", "", "")
	cf.Int("count", 0, "")
	cf.String("cpu", "", "")
	cf.StringVar(&testCPUProfile, "cpuprofile", "", "")
	cf.BoolVar(&testFailFast, "failfast", false, "")

	lockedExt     uint32      // tracking for external LockOSThread
	lockedInt     uint32      // tracking for internal lockOSThread
	nextwaitm     muintptr    // next m waiting for lock

	mLockProfile mLockProfile // fields relating to runtime.lock contention
	profStack    []uintptr    // used for memory/block/mutex stack traces

	// wait* are used to carry arguments from gopark into park_m, because