if (verbose) {
				printf("attempting external signal test\n");
			}

			fprintf(stderr, "OK\n");
			fflush(stderr);

			// The program should be interrupted before
			// this sleep finishes. We use select rather
			// than sleep because in older versions of
			// glibc the sleep function does some signal
			// fiddling to handle SIGCHLD.  If this
			// program is fiddling signals just when the

	OpLessThan ThresholdOperator = "LessThan"
)

// OpForSignal maps Signals to ThresholdOperators.
// Today, the only supported operator is "LessThan". This may change in the future,
// for example if "consumed" (as opposed to "available") type signals are added.
// In both cases the directionality of the threshold is implicit to the signal type
// (for a given signal, the decision to evict will be made when crossing the threshold

package main

/*
#include <signal.h>
#include <pthread.h>

// Raise SIGIO.
static void CRaiseSIGIO(pthread_t* p) {
	pthread_kill(*p, SIGIO);
}
*/
import "C"

import (
	"os"
	"os/signal"
	"sync/atomic"
	"syscall"
)

var sigioCount int32

// Catch SIGIO.
//
//export GoCatchSIGIO
func GoCatchSIGIO() {
	c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGIO)

	}
}

// signalWaitUntilIdle waits until the signal delivery mechanism is idle.
// This is used to ensure that we do not drop a signal notification due
// to a race between disabling a signal and receiving a signal.
// This assumes that signal delivery has already been disabled for
// the signal(s) in question, and here we are just waiting to make sure
// that all the signals have been delivered to the user channels

	MOVD	R1, R4

	// Store g on gsignal's stack, so if we receive a signal
	// during VDSO code we can find the g.
	// If we don't have a signal stack, we won't receive signal,
	// so don't bother saving g.
	// When using cgo, we already saved g on TLS, also don't save
	// g here.
	// Also don't save g if we are already on the signal stack.
	// We won't get a nested signal.
	MOVBZ	runtime·iscgo(SB), R22
	CMP	R22, $0
	BNE	nosaveg

		// first call on an M, until that libcCall instance
		// returns.  Reentrance only matters for signals, as
		// libc never calls back into Go.  The tricky case is
		// where we call libcX from an M and record g/pc/sp.
		// Before that call returns, a signal arrives on the
		// same M and the signal handling code calls another
		// libc function.  We don't want that second libcCall

		defer notAcceptingNewRequestCh.Signal()

		// wait for the delayed stopCh before closing the handler chain
		<-delayedStopCh.Signaled()

		// Additionally wait for preshutdown hooks to also be finished, as some of them need
		// to send API calls to clean up after themselves (e.g. lease reconcilers removing
		// itself from the active servers).
		<-preShutdownHooksHasStoppedCh.Signaled()
	}()

	MOVV	R23, R3	// restore SP
	// Restore vdsoPC, vdsoSP
	// We don't worry about being signaled between the two stores.
	// If we are not in a signal handler, we'll restore vdsoSP to 0,
	// and no one will care about vdsoPC. If we are in a signal handler,
	// we cannot receive another signal.
	MOVV	16(R3), R25
	MOVV	R25, m_vdsoSP(R24)
	MOVV	8(R3), R25
	MOVV	R25, m_vdsoPC(R24)

	MOVV	R7, sec+0(FP)

	return false
}

// terminationSignal returns -1 and false because Windows doesn't have signals.
func terminationSignal(err error) (os.Signal, bool) {
	return syscall.Signal(-1), false
}

// isCrashSignal is not implemented because Windows doesn't have signals.
func isCrashSignal(signal os.Signal) bool {
	panic("not implemented: no signals on windows")

    @Subject def signal = new DefaultFileLockManager.AwaitableFileLockReleasedSignal()

    def "can reuse signal"() {
        given:
        def signalCount = new AtomicInteger()

        when:
        start {
            while (signalCount.get() < 2) {
                def signaled = signal.await(10000)
                if (signaled) {
                    signalCount.incrementAndGet()