signal.Notify(c, os.Interrupt)
	defer signal.Stop(c)

	p := &os.Process{Pid: os.Getpid()}
	if err := p.Signal(os.Interrupt); err != nil {
		t.Fatalf("Signal got err %v, want nil", err)
	}

	// Verify we actually received the signal.
	select {
	case <-time.After(1 * time.Second):
		t.Error("timeout waiting for signal")
	case <-c:
		// Good
	}
}

func TestProcessReleaseTwice(t *testing.T) {

	/* 56 */ {_SigNotify, "real time signal"},
	/* 57 */ {_SigNotify, "real time signal"},
	/* 58 */ {_SigNotify, "real time signal"},
	/* 59 */ {_SigNotify, "real time signal"},
	/* 60 */ {_SigNotify, "real time signal"},
	/* 61 */ {_SigNotify, "real time signal"},
	/* 62 */ {_SigNotify, "real time signal"},
	/* 63 */ {_SigNotify, "real time signal"},
	/* 64 */ {_SigNotify, "real time signal"},
	/* 65 */ {_SigNotify, "real time signal"},

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

//go:build linux

package signal

import (
	"os"
	"syscall"
	"testing"
	"time"
)

const prSetKeepCaps = 8

// This test validates that syscall.AllThreadsSyscall() can reliably
// reach all 'm' (threads) of the nocgo runtime even when one thread
// is blocked waiting to receive signals from the kernel. This monitors
// for a regression vs. the fix for #43149.

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

package main

// This program failed when run under the C/C++ ThreadSanitizer. The
// TSAN library was not keeping track of whether signals should be
// delivered on the alternate signal stack, and the Go signal handler
// was not preserving callee-saved registers from C callers.

/*
#cgo CFLAGS: -g -fsanitize=thread
#cgo LDFLAGS: -g -fsanitize=thread

#include <stdlib.h>

		}
	}
	return r1, r2
}

// winch sends a few SIGWINCH signals to the process.
func winch() {
	ticker := time.NewTicker(100 * time.Microsecond)
	defer ticker.Stop()
	pid := syscall.Getpid()
	for n := 10; n > 0; n-- {
		syscall.Kill(pid, syscall.SIGWINCH)
		<-ticker.C
	}
}

// sendSomeSignals triggers a few SIGURG and SIGWINCH signals.
func sendSomeSignals() {
	done := make(chan struct{})
	go func() {

	h.once.Do(func() {
		for _, fn := range h.notify {
			fn()
		}
	})
}

// Signal is called when an os.Signal is received, and guarantees that all notifications
// are executed, then the final handler is executed. This function should only be called once
// per Handler instance.
func (h *Handler) Signal(s os.Signal) {
	h.once.Do(func() {
		for _, fn := range h.notify {
			fn()
		}
		if h.final == nil {

	free(v);

	// On NetBSD, a new thread inherits the signal stack of the
	// creating thread. That confuses minit, so we remove that
	// signal stack here before calling the regular mstart. It's
	// a bit baroque to remove a signal stack here only to add one
	// in minit, but it's a simple change that keeps NetBSD
	// working like other OS's. At this point all signals are
	// blocked, so there is no race.
	memset(&ss, 0, sizeof ss);

	ready(mp)

	// Wait for the signal. We use a pipe rather than a note
	// because write is always async-signal-safe.
	entersyscallblock()
	var b byte
	read(waitForSigusr1.rdpipe, noescape(unsafe.Pointer(&b)), 1)
	exitsyscall()

	gotM := waitForSigusr1.mID
	testSigusr1 = nil

	unlockOSThread()

	if b != 0 {
		// timeout signal from caller
		return -1, -1
	}
	return mp.id, gotM
}

//go:build unix
// +build unix

package main

// Test that an external C thread that is calling malloc can be hit
// with SIGCHLD signals. This used to fail when built with the race
// detector, because in that case the signal handler would indirectly
// call the C malloc function.

/*
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sched.h>

const serverShutdownSignalKey serverShutdownSignalKeyType = iota

// ServerShutdownSignal is associated with the request context so
// the request handler logic has access to signals rlated to
// the server shutdown events
type ServerShutdownSignal interface {
	// Signaled when the apiserver is not receiving any new request
	ShuttingDown() <-chan struct{}
}

// ServerShutdownSignalFrom returns the ServerShutdownSignal instance