type Cache struct {
	// Storage for low-numbered values and blocks.
	values [2000]Value
	blocks [200]Block
	locs   [2000]Location

	// Reusable stackAllocState.
	// See stackalloc.go's {new,put}StackAllocState.
	stackAllocState *stackAllocState

	scrPoset []*poset // scratch poset to be reused

	// Reusable regalloc state.
	regallocValues []valState

	ValueToProgAfter []*obj.Prog

	// The Darwin C library enforces a minimum that the kernel does not.
	// This is OK since we allocated this much space in mpreinit,
	// it was just removed from the buffer by stackalloc.
	oss.ss_size = MINSIGSTKSZ;
#endif
	if (sigaltstack(&oss, NULL) < 0) {
		perror("sigaltstack restore");
		abort();
	}
}

static int zero(void) {
	return 0;
}
*/
import "C"

import (

// license that can be found in the LICENSE file.

//go:build !openbsd

package runtime

// osStackAlloc performs OS-specific initialization before s is used
// as stack memory.
func osStackAlloc(s *mspan) {
}

// osStackFree undoes the effect of osStackAlloc before s is returned
// to the heap.
func osStackFree(s *mspan) {

	setProcessCPUProfilerTimer(hz)
}

func setThreadCPUProfiler(hz int32) {
	setThreadCPUProfilerHz(hz)
}

//go:nosplit
func validSIGPROF(mp *m, c *sigctxt) bool {
	return true
}

func osStackAlloc(s *mspan) {
	osStackRemap(s, _MAP_STACK)
}

func osStackFree(s *mspan) {
	// Undo MAP_STACK.
	osStackRemap(s, 0)
}

func osStackRemap(s *mspan, flags int32) {