signalbug.cpp - mozsearch

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "signalbug.h"

#include <qcoreapplication.h>

#include <qstring.h>

#include <stdio.h>

static int Step = 0;

Sender RandomSender (0, 0);

void TRACE (int step, const char *name)

    for (int t = 0; t < step - 1; t++)

        fprintf (stderr, "\t");

    fprintf (stderr, "Step %d: %s\n", step, name);

    return;

Receiver::Receiver ()

    : QObject ()

void Receiver::received ()

    ::Step++;

    const int stepCopy = ::Step;

    TRACE (stepCopy, "Receiver::received()");

    if (::Step != 2 && ::Step != 4)

        qFatal("%s: Incorrect Step: %d (should be 2 or 4)", Q_FUNC_INFO, ::Step);

    if (::Step == 2)

        s->fire ();

    fprintf (stderr, "Receiver<%s>::received() sender=%s\n",

        (const char *) objectName ().toLatin1 (), sender ()->metaObject()->className());

    TRACE (stepCopy, "ends Receiver::received()");

Disconnector::Disconnector ()

    : QObject ()

void Disconnector::received ()

    ::Step++;

    const int stepCopy = ::Step;

    TRACE (stepCopy, "Disconnector::received()");

    if (::Step != 5 && ::Step != 6)

        qFatal("%s: Incorrect Step: %d (should be 5 or 6)", Q_FUNC_INFO, ::Step);

    fprintf (stderr, "Disconnector<%s>::received() sender=%s\n",

        (const char *) objectName ().toLatin1 (), sender ()->metaObject()->className());

    if (sender () == 0)

        fprintf (stderr, "WE SHOULD NOT BE RECEIVING THIS SIGNAL\n");

    if (::Step == 5)

        disconnect (s, SIGNAL(fired()), s->d, SLOT(received()));

        connect (&RandomSender, SIGNAL(fired()), s->d, SLOT(received()));

    TRACE (stepCopy, "ends Disconnector::received()");

Sender::Sender (Receiver *r, Disconnector *d)

    : QObject ()

    this->r = r; this->d = d;

    if (r)

        connect (this, SIGNAL(fired()), r, SLOT(received()));

    if (d)

        connect (this, SIGNAL(fired()), d, SLOT(received()));

};

void Sender::fire ()

    ::Step++;

    const int stepCopy = ::Step;

    TRACE (stepCopy, "Sender::fire()");

    if (::Step != 1 && ::Step != 3)

        qFatal("%s: Incorrect Step: %d (should be 1 or 3)", Q_FUNC_INFO, ::Step);

    emit fired ();

    TRACE (stepCopy, "ends Sender::fire()");

int main (int argc, char *argv [])

    QCoreApplication app (argc, argv);

    Receiver r;

    Disconnector d;

    Sender s (&r, &d);

    r.s = &s;

    d.s = &s;

    ::Step = 0;

    s.fire ();

    return 0;