throw("sem_init")
	}
	mp.waitsema = uintptr(unsafe.Pointer(sem))
}

//go:nosplit
func semasleep(ns int64) int32 {
	mp := getg().m
	if ns >= 0 {
		mp.ts.tv_sec = ns / 1000000000
		mp.ts.tv_nsec = ns % 1000000000

		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
		mp.libcall.n = 2
		mp.scratch = mscratch{}
		mp.scratch.v[0] = mp.waitsema

		err = pthread_create(thread, attr, pfn, arg);
		if (err == 0) {
			pthread_detach(*thread);
			return 0;
		}
		if (err != EAGAIN) {
			return err;
		}
		ts.tv_sec = 0;
		ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
		nanosleep(&ts, nil);
	}
	return EAGAIN;
}

static void
pthread_key_destructor(void* g) {
	if (x_crosscall2_ptr != NULL) {

		die("kill");
	}

	if (verbose) {
		fprintf(stderr, "waiting for sigioSeen\n");
	}

	// Wait until the signal has been delivered.
	i = 0;
	while (!sigioSeen) {
		ts.tv_sec = 0;
		ts.tv_nsec = 1000000;
		nanosleep(&ts, NULL);
		i++;
		if (i > 5000) {
			fprintf(stderr, "looping too long waiting for signal\n");
			exit(EXIT_FAILURE);
		}
	}

	if (verbose) {

const vdsoCProgram = `
#include <stdio.h>
#include <time.h>

int main() {
	int i;
	time_t tot;
	for (i = 0; i < 100; i++) {
		struct timespec ts;
		clock_gettime(CLOCK_MONOTONIC, &ts);
		tot += ts.tv_nsec;
	}
	printf("%d\n", (int)(tot));
	return 0;
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime

import "unsafe"

type mts struct {
	tv_sec  int64
	tv_nsec int64
}

type mscratch struct {
	v [6]uintptr
}

type mOS struct {
	waitsema uintptr // semaphore for parking on locks
	perrno   *int32  // pointer to tls errno

noswitch:
	SUBL	$16, SP		// Space for results
	ANDL	$~15, SP	// Align for C code

	// Stack layout, depending on call path:
	//  x(SP)   vDSO            INVOKE_SYSCALL
	//    12    ts.tv_nsec      ts.tv_nsec
	//     8    ts.tv_sec       ts.tv_sec
	//     4    &ts             -
	//     0    CLOCK_<id>      -

	MOVL	runtime·vdsoClockgettimeSym(SB), AX
	CMPL	AX, $0
	JEQ	fallback

	LEAL	8(SP), BX	// &ts (struct timespec)

	JAE	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·usleep(SB),NOSPLIT,$20
	MOVL	$0, DX
	MOVL	usec+0(FP), AX
	MOVL	$1000000, CX
	DIVL	CX
	MOVL	AX, 12(SP)		// tv_sec
	MOVL	$1000, AX
	MULL	DX
	MOVL	AX, 16(SP)		// tv_nsec

	MOVL	$0, 0(SP)
	LEAL	12(SP), AX
	MOVL	AX, 4(SP)		// arg 1 - rqtp
	MOVL	$0, 8(SP)		// arg 2 - rmtp
	MOVL	$SYS_nanosleep, AX
	INT	$0x80
	RET

/*

	MOVL	AX, ret+24(FP)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVL	$0, DX
	MOVL	usec+0(FP), AX
	MOVL	$1000000, CX
	DIVL	CX
	MOVQ	AX, 0(SP)		// tv_sec
	MOVL	$1000, AX
	MULL	DX
	MOVQ	AX, 8(SP)		// tv_nsec

	MOVQ	SP, DI			// arg 1 - rqtp
	MOVQ	$0, SI			// arg 2 - rmtp
	MOVL	$SYS___nanosleep50, AX
	SYSCALL
	RET

TEXT runtime·lwp_kill(SB),NOSPLIT,$0-16

	JCC	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVL	$0, DX
	MOVL	usec+0(FP), AX
	MOVL	$1000000, CX
	DIVL	CX
	MOVQ	AX, 0(SP)		// tv_sec
	MOVL	$1000, AX
	MULL	DX
	MOVQ	AX, 8(SP)		// tv_nsec

	MOVQ	SP, DI			// arg 1 - rqtp
	MOVQ	$0, SI			// arg 2 - rmtp
	MOVL	$240, AX		// sys_nanosleep
	SYSCALL
	RET

// set tls base to DI

	MOVL	AX, ret+12(FP)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$24
	MOVL	$0, DX
	MOVL	usec+0(FP), AX
	MOVL	$1000000, CX
	DIVL	CX
	MOVL	AX, 12(SP)		// tv_sec - l32
	MOVL	$0, 16(SP)		// tv_sec - h32
	MOVL	$1000, AX
	MULL	DX
	MOVL	AX, 20(SP)		// tv_nsec

	MOVL	$0, 0(SP)
	LEAL	12(SP), AX
	MOVL	AX, 4(SP)		// arg 1 - rqtp
	MOVL	$0, 8(SP)		// arg 2 - rmtp
	MOVL	$SYS___nanosleep50, AX
	INT	$0x80
	RET