//
// This is a regression test for issue 50936.

/*
#include <unistd.h>

void goCallbackPprof();

static void callGo() {
	// Spent >20us in C so this thread is eligible for sysmon to retake its
	// P.
	usleep(50);
	goCallbackPprof();
}
*/
import "C"

import (
	"fmt"
	"os"
	"runtime"
	"runtime/pprof"
	"time"
)

func init() {

				startm(nil, false, false)
			}
		}
		if scavenger.sysmonWake.Load() != 0 {
			// Kick the scavenger awake if someone requested it.
			scavenger.wake()
		}
		// retake P's blocked in syscalls
		// and preempt long running G's
		if retake(now) != 0 {
			idle = 0
		} else {
			idle++
		}
		// check if we need to force a GC

	// context of just emitting this event alone. There are two cases. Either we're trying to steal
	// the P just to get its attention (e.g. STW or sysmon retake) or we're trying to steal a P for
	// ourselves specifically to keep running. The two contexts look different, but can be summarized
	// fairly succinctly. In the former, we're a regular running goroutine and proc, if we have either.

			return
		}
	}
}

// take moves any timers from src into ts
// and then clears the timer state from src,
// because src is being destroyed.
// The caller must not have locked either timers.
// For now this is only called when the world is stopped.
func (ts *timers) take(src *timers) {
	ts.trace("take")
	assertWorldStopped()
	if len(src.heap) > 0 {

	// may be stolen by another M. This is similar to _Pidle but
	// uses lightweight transitions and maintains M affinity.
	//
	// Leaving _Psyscall must be done with a CAS, either to steal
	// or retake the P. Note that there's an ABA hazard: even if
	// an M successfully CASes its original P back to _Prunning
	// after a syscall, it must understand the P may have been
	// used by another M in the interim.
	_Psyscall

	// someone is calling forEachP.
	//
	// TODO(mknyszek): Consider always checking gp.preempt instead
	// of having the preempt flag, and making an exception for certain
	// mark workers in retake. That might be simpler than trying to
	// enumerate all the reasons why we might want to preempt, even
	// if we're supposed to be mostly non-preemptible.

	// frequently resize its SyncClocks.
	for i := 0; i < 100; i++ {
		go func() {
			for ctx.Err() == nil {
				// Sleep in C for long enough that it is likely that the runtime
				// will retake this goroutine's currently wired P.
				C.usleep(1000 /* 1ms */)
				runtime.Gosched() // avoid starvation (see #28701)
			}
		}()
		go func() {
			// Trigger lots of synchronization and memory reads/writes to

Emmanuel Odeke <******@****.***> 1460323946 -0700

// 0xf0_00_00_00_00_00_00_0f | 60    | 3
//
// The Amount value represents the amount to rotate the
// input left by. Note that this rotation is performed
// before the masked region is used.
type RotateParams struct {
	Start  uint8 // big-endian start bit index [0..63]
	End    uint8 // big-endian end bit index [0..63]
	Amount uint8 // amount to rotate left
}

// NewRotateParams creates a set of parameters representing a

	return a
}

// Issue 18254: rotate after inlining
func f32(x uint32) uint32 {
	// amd64:"ROLL\t[$]7"
	return rot32nc(x, 7)
}

func doubleRotate(x uint64) uint64 {
	x = (x << 5) | (x >> 59)
	// amd64:"ROLQ\t[$]15"
	// arm64:"ROR\t[$]49"
	x = (x << 10) | (x >> 54)
	return x
}

// --------------------------------------- //
//    Combined Rotate + Masking operations //