import (
	"time"
)

// Implemented in package runtime.
func readGCStats(*[]time.Duration)
func freeOSMemory()
func setMaxStack(int) int
func setGCPercent(int32) int32
func setPanicOnFault(bool) bool
func setMaxThreads(int) int

	//
	// This can only happen when ints are 64 bits, since on platforms
	// with 32 bit ints SetMaxThreads (which takes an int parameter)
	// cannot be given anything that will overflow an int32.
	//
	// Call SetMaxThreads with 1<<31, but only on 64 bit systems.
	nt := SetMaxThreads(1 << (30 + ^uint(0)>>63))
	SetMaxThreads(nt) // restore previous value

	sysMaxThreads, err := sys.GetMaxThreads()
	if err == nil {
		minioMaxThreads := (sysMaxThreads * 90) / 100
		// Only set max threads if it is greater than the default one
		if minioMaxThreads > 10000 {
			debug.SetMaxThreads(minioMaxThreads)
		}
	}

	var maxLimit uint64

	// Set open files limit to maximum.
	if _, maxLimit, err = sys.GetMaxOpenFileLimit(); err != nil {
		return err
	}

}

func StackOverflow() {
	var f func() byte
	f = func() byte {
		var buf [64 << 10]byte
		return buf[0] + f()
	}
	debug.SetMaxStack(1474560)
	f()
}

func ThreadExhaustion() {
	debug.SetMaxThreads(10)
	c := make(chan int)
	for i := 0; i < 100; i++ {
		go func() {
			runtime.LockOSThread()
			c <- 0
			select {}
		}()
		<-c
	}
}

func RecursivePanic() {
	func() {