"runtime"
	"syscall"
)

// The only signal values guaranteed to be present in the os package on all
// systems are os.Interrupt (send the process an interrupt) and os.Kill (force
// the process to exit). On Windows, sending os.Interrupt to a process with
// os.Process.Signal is not implemented; it will return an error instead of
// sending a signal.
var (
	Interrupt Signal = syscall.SIGINT
	Kill      Signal = syscall.SIGKILL
)

}

//export goCallbackPprof
func goCallbackPprof() {
	// No-op. We want to stress the cgocall and cgocallback internals,
	// landing as many pprof signals there as possible.
}

func CgoPprofCallback() {
	// Issue 50936 was a crash in the SIGPROF handler when the signal
	// arrived during the exitsyscall following a cgocall(back) in dropg or
	// execute, when updating mp.curg.
	//

	MOVQ	R12, SP		// Restore real 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.
	MOVQ	8(SP), SI
	MOVQ	SI, m_vdsoSP(BX)
	MOVQ	0(SP), SI
	MOVQ	SI, m_vdsoPC(BX)

		// than it does for an attempt to access a valid but unmapped address.
		// OS X 10.9.2 mishandles the malformed address case, making it look like
		// a user-generated signal (like someone ran kill -SEGV ourpid).
		// We pass user-generated signals to os/signal, or else ignore them.
		// Doing that here - and returning to the faulting code - results in an
		// infinite loop. It appears the best we can do is rewrite what the kernel

			// When apiserver is shutting down, signal clients to retry
			// There is a good chance the client hit a different server, so a tight retry is good for client responsiveness.
			waitGroupWriteRetryAfterToResponse(w)
			return
		}

		// attach ServerShutdownSignal to the watch request so that the
		// watch handler loop can return as soon as the server signals
		// that it is shutting down.

}

def AwaitAllControlOp: Mlrt_Op<"await_all_control", []> {
  let summary = "Awaits multiple signals";

  let description = [{
    Awaits multiple signals

    $futures: A list of !mlrt.futures
  }];

  let arguments = (ins
    Variadic<MlrtFutureType>:$futures
  );

  let assemblyFormat = "operands attr-dict `:` type($futures)";
}

	}
	for n > 0 {
		select {
		case <-awake:
			t.Fatal("goroutine not asleep")
		default:
		}
		m.Lock()
		c.Signal()
		m.Unlock()
		<-awake // Will deadlock if no goroutine wakes up
		select {
		case <-awake:
			t.Fatal("too many goroutines awake")
		default:
		}
		n--
	}
	c.Signal()
}

func TestCondSignalGenerations(t *testing.T) {
	var m Mutex
	c := NewCond(&m)
	n := 100

// Without the protection key a request could still get a 404 response when the registered signals changed their status just slightly before reaching the new handler.
// In that case, the presence of the key will make the handler return a 503 instead of a 404.

	return e == EINTR || e == EMFILE || e.Timeout()
}

func (e Errno) Timeout() bool {
	return e == EAGAIN || e == ETIMEDOUT
}

// A Signal is a number describing a process signal.
// It implements the [os.Signal] interface.
type Signal uint8

const (
	SIGNONE Signal = iota
	SIGHUP
	SIGINT
	SIGQUIT
	SIGILL
	SIGTRAP
	SIGABRT
	SIGBUS
	SIGFPE
	SIGKILL
	SIGUSR1
	SIGSEGV
	SIGUSR2

/*
#define KERNEL
#include <dirent.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/select.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>