summaryrefslogtreecommitdiffstats
path: root/src/corelib/kernel/qeventdispatcher_unix.cpp
blob: df0cac023994aedc7bd3d179c414b4423ecddff1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2016 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformdefs.h"

#include "qcoreapplication.h"
#include "qpair.h"
#include "qsocketnotifier.h"
#include "qthread.h"
#include "qelapsedtimer.h"

#include "qeventdispatcher_unix_p.h"
#include <private/qthread_p.h>
#include <private/qcoreapplication_p.h>
#include <private/qcore_unix_p.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

#ifndef QT_NO_EVENTFD
#  include <sys/eventfd.h>
#endif

// VxWorks doesn't correctly set the _POSIX_... options
#if defined(Q_OS_VXWORKS)
#  if defined(_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK <= 0)
#    undef _POSIX_MONOTONIC_CLOCK
#    define _POSIX_MONOTONIC_CLOCK 1
#  endif
#  include <pipeDrv.h>
#  include <sys/time.h>
#endif

#if (_POSIX_MONOTONIC_CLOCK-0 <= 0) || defined(QT_BOOTSTRAPPED)
#  include <sys/times.h>
#endif

QT_BEGIN_NAMESPACE

static const char *socketType(QSocketNotifier::Type type)
{
    switch (type) {
    case QSocketNotifier::Read:
        return "Read";
    case QSocketNotifier::Write:
        return "Write";
    case QSocketNotifier::Exception:
        return "Exception";
    }

    Q_UNREACHABLE();
}

QThreadPipe::QThreadPipe()
{
    fds[0] = -1;
    fds[1] = -1;
#if defined(Q_OS_VXWORKS)
    name[0] = '\0';
#endif
}

QThreadPipe::~QThreadPipe()
{
    if (fds[0] >= 0)
        close(fds[0]);

    if (fds[1] >= 0)
        close(fds[1]);

#if defined(Q_OS_VXWORKS)
    pipeDevDelete(name, true);
#endif
}

#if defined(Q_OS_VXWORKS)
static void initThreadPipeFD(int fd)
{
    int ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
    if (ret == -1)
        perror("QEventDispatcherUNIXPrivate: Unable to init thread pipe");

    int flags = fcntl(fd, F_GETFL);
    if (flags == -1)
        perror("QEventDispatcherUNIXPrivate: Unable to get flags on thread pipe");

    ret = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
    if (ret == -1)
        perror("QEventDispatcherUNIXPrivate: Unable to set flags on thread pipe");
}
#endif

bool QThreadPipe::init()
{
#if defined(Q_OS_NACL) || defined(Q_OS_WASM)
   // do nothing.
#elif defined(Q_OS_VXWORKS)
    qsnprintf(name, sizeof(name), "/pipe/qt_%08x", int(taskIdSelf()));

    // make sure there is no pipe with this name
    pipeDevDelete(name, true);

    // create the pipe
    if (pipeDevCreate(name, 128 /*maxMsg*/, 1 /*maxLength*/) != OK) {
        perror("QThreadPipe: Unable to create thread pipe device %s", name);
        return false;
    }

    if ((fds[0] = open(name, O_RDWR, 0)) < 0) {
        perror("QThreadPipe: Unable to open pipe device %s", name);
        return false;
    }

    initThreadPipeFD(fds[0]);
    fds[1] = fds[0];
#else
#  ifndef QT_NO_EVENTFD
    if ((fds[0] = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC)) >= 0)
        return true;
#  endif
    if (qt_safe_pipe(fds, O_NONBLOCK) == -1) {
        perror("QThreadPipe: Unable to create pipe");
        return false;
    }
#endif

    return true;
}

pollfd QThreadPipe::prepare() const
{
    return qt_make_pollfd(fds[0], POLLIN);
}

void QThreadPipe::wakeUp()
{
    if (wakeUps.testAndSetAcquire(0, 1)) {
#ifndef QT_NO_EVENTFD
        if (fds[1] == -1) {
            // eventfd
            eventfd_t value = 1;
            int ret;
            EINTR_LOOP(ret, eventfd_write(fds[0], value));
            return;
        }
#endif
        char c = 0;
        qt_safe_write(fds[1], &c, 1);
    }
}

int QThreadPipe::check(const pollfd &pfd)
{
    Q_ASSERT(pfd.fd == fds[0]);

    char c[16];
    const int readyread = pfd.revents & POLLIN;

    if (readyread) {
        // consume the data on the thread pipe so that
        // poll doesn't immediately return next time
#if defined(Q_OS_VXWORKS)
        ::read(fds[0], c, sizeof(c));
        ::ioctl(fds[0], FIOFLUSH, 0);
#else
#  ifndef QT_NO_EVENTFD
        if (fds[1] == -1) {
            // eventfd
            eventfd_t value;
            eventfd_read(fds[0], &value);
        } else
#  endif
        {
            while (::read(fds[0], c, sizeof(c)) > 0) {}
        }
#endif

        if (!wakeUps.testAndSetRelease(1, 0)) {
            // hopefully, this is dead code
            qWarning("QThreadPipe: internal error, wakeUps.testAndSetRelease(1, 0) failed!");
        }
    }

    return readyread;
}

QEventDispatcherUNIXPrivate::QEventDispatcherUNIXPrivate()
{
    if (Q_UNLIKELY(threadPipe.init() == false))
        qFatal("QEventDispatcherUNIXPrivate(): Cannot continue without a thread pipe");
}

QEventDispatcherUNIXPrivate::~QEventDispatcherUNIXPrivate()
{
    // cleanup timers
    qDeleteAll(timerList);
}

void QEventDispatcherUNIXPrivate::setSocketNotifierPending(QSocketNotifier *notifier)
{
    Q_ASSERT(notifier);

    if (pendingNotifiers.contains(notifier))
        return;

    pendingNotifiers << notifier;
}

int QEventDispatcherUNIXPrivate::activateTimers()
{
    return timerList.activateTimers();
}

void QEventDispatcherUNIXPrivate::markPendingSocketNotifiers()
{
    for (const pollfd &pfd : qAsConst(pollfds)) {
        if (pfd.fd < 0 || pfd.revents == 0)
            continue;

        auto it = socketNotifiers.find(pfd.fd);
        Q_ASSERT(it != socketNotifiers.end());

        const QSocketNotifierSetUNIX &sn_set = it.value();

        static const struct {
            QSocketNotifier::Type type;
            short flags;
        } notifiers[] = {
            { QSocketNotifier::Read,      POLLIN  | POLLHUP | POLLERR },
            { QSocketNotifier::Write,     POLLOUT | POLLHUP | POLLERR },
            { QSocketNotifier::Exception, POLLPRI | POLLHUP | POLLERR }
        };

        for (const auto &n : notifiers) {
            QSocketNotifier *notifier = sn_set.notifiers[n.type];

            if (!notifier)
                continue;

            if (pfd.revents & POLLNVAL) {
                qWarning("QSocketNotifier: Invalid socket %d with type %s, disabling...",
                         it.key(), socketType(n.type));
                notifier->setEnabled(false);
            }

            if (pfd.revents & n.flags)
                setSocketNotifierPending(notifier);
        }
    }

    pollfds.clear();
}

int QEventDispatcherUNIXPrivate::activateSocketNotifiers()
{
    markPendingSocketNotifiers();

    if (pendingNotifiers.isEmpty())
        return 0;

    int n_activated = 0;
    QEvent event(QEvent::SockAct);

    while (!pendingNotifiers.isEmpty()) {
        QSocketNotifier *notifier = pendingNotifiers.takeFirst();
        QCoreApplication::sendEvent(notifier, &event);
        ++n_activated;
    }

    return n_activated;
}

QEventDispatcherUNIX::QEventDispatcherUNIX(QObject *parent)
    : QAbstractEventDispatcher(*new QEventDispatcherUNIXPrivate, parent)
{ }

QEventDispatcherUNIX::QEventDispatcherUNIX(QEventDispatcherUNIXPrivate &dd, QObject *parent)
    : QAbstractEventDispatcher(dd, parent)
{ }

QEventDispatcherUNIX::~QEventDispatcherUNIX()
{ }

/*!
    \internal
*/
void QEventDispatcherUNIX::registerTimer(int timerId, int interval, Qt::TimerType timerType, QObject *obj)
{
#ifndef QT_NO_DEBUG
    if (timerId < 1 || interval < 0 || !obj) {
        qWarning("QEventDispatcherUNIX::registerTimer: invalid arguments");
        return;
    } else if (obj->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QEventDispatcherUNIX::registerTimer: timers cannot be started from another thread");
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    d->timerList.registerTimer(timerId, interval, timerType, obj);
}

/*!
    \internal
*/
bool QEventDispatcherUNIX::unregisterTimer(int timerId)
{
#ifndef QT_NO_DEBUG
    if (timerId < 1) {
        qWarning("QEventDispatcherUNIX::unregisterTimer: invalid argument");
        return false;
    } else if (thread() != QThread::currentThread()) {
        qWarning("QEventDispatcherUNIX::unregisterTimer: timers cannot be stopped from another thread");
        return false;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    return d->timerList.unregisterTimer(timerId);
}

/*!
    \internal
*/
bool QEventDispatcherUNIX::unregisterTimers(QObject *object)
{
#ifndef QT_NO_DEBUG
    if (!object) {
        qWarning("QEventDispatcherUNIX::unregisterTimers: invalid argument");
        return false;
    } else if (object->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QEventDispatcherUNIX::unregisterTimers: timers cannot be stopped from another thread");
        return false;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    return d->timerList.unregisterTimers(object);
}

QList<QEventDispatcherUNIX::TimerInfo>
QEventDispatcherUNIX::registeredTimers(QObject *object) const
{
    if (!object) {
        qWarning("QEventDispatcherUNIX:registeredTimers: invalid argument");
        return QList<TimerInfo>();
    }

    Q_D(const QEventDispatcherUNIX);
    return d->timerList.registeredTimers(object);
}

/*****************************************************************************
 QEventDispatcher implementations for UNIX
 *****************************************************************************/

void QEventDispatcherUNIX::registerSocketNotifier(QSocketNotifier *notifier)
{
    Q_ASSERT(notifier);
    int sockfd = notifier->socket();
    QSocketNotifier::Type type = notifier->type();
#ifndef QT_NO_DEBUG
    if (notifier->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QSocketNotifier: socket notifiers cannot be enabled from another thread");
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    QSocketNotifierSetUNIX &sn_set = d->socketNotifiers[sockfd];

    if (sn_set.notifiers[type] && sn_set.notifiers[type] != notifier)
        qWarning("%s: Multiple socket notifiers for same socket %d and type %s",
                 Q_FUNC_INFO, sockfd, socketType(type));

    sn_set.notifiers[type] = notifier;
}

void QEventDispatcherUNIX::unregisterSocketNotifier(QSocketNotifier *notifier)
{
    Q_ASSERT(notifier);
    int sockfd = notifier->socket();
    QSocketNotifier::Type type = notifier->type();
#ifndef QT_NO_DEBUG
    if (notifier->thread() != thread() || thread() != QThread::currentThread()) {
        qWarning("QSocketNotifier: socket notifier (fd %d) cannot be disabled from another thread.\n"
                "(Notifier's thread is %s(%p), event dispatcher's thread is %s(%p), current thread is %s(%p))",
                sockfd,
                notifier->thread() ? notifier->thread()->metaObject()->className() : "QThread", notifier->thread(),
                thread() ? thread()->metaObject()->className() : "QThread", thread(),
                QThread::currentThread() ? QThread::currentThread()->metaObject()->className() : "QThread", QThread::currentThread());
        return;
    }
#endif

    Q_D(QEventDispatcherUNIX);

    d->pendingNotifiers.removeOne(notifier);

    auto i = d->socketNotifiers.find(sockfd);
    if (i == d->socketNotifiers.end())
        return;

    QSocketNotifierSetUNIX &sn_set = i.value();

    if (sn_set.notifiers[type] == nullptr)
        return;

    if (sn_set.notifiers[type] != notifier) {
        qWarning("%s: Multiple socket notifiers for same socket %d and type %s",
                 Q_FUNC_INFO, sockfd, socketType(type));
        return;
    }

    sn_set.notifiers[type] = nullptr;

    if (sn_set.isEmpty())
        d->socketNotifiers.erase(i);
}

bool QEventDispatcherUNIX::processEvents(QEventLoop::ProcessEventsFlags flags)
{
    Q_D(QEventDispatcherUNIX);
    d->interrupt.store(0);

    // we are awake, broadcast it
    emit awake();
    QCoreApplicationPrivate::sendPostedEvents(0, 0, d->threadData);

    const bool include_timers = (flags & QEventLoop::X11ExcludeTimers) == 0;
    const bool include_notifiers = (flags & QEventLoop::ExcludeSocketNotifiers) == 0;
    const bool wait_for_events = flags & QEventLoop::WaitForMoreEvents;

    const bool canWait = (d->threadData->canWaitLocked()
                          && !d->interrupt.load()
                          && wait_for_events);

    if (canWait)
        emit aboutToBlock();

    if (d->interrupt.load())
        return false;

    timespec *tm = nullptr;
    timespec wait_tm = { 0, 0 };

    if (!canWait || (include_timers && d->timerList.timerWait(wait_tm)))
        tm = &wait_tm;

    d->pollfds.clear();
    d->pollfds.reserve(1 + (include_notifiers ? d->socketNotifiers.size() : 0));

    if (include_notifiers)
        for (auto it = d->socketNotifiers.cbegin(); it != d->socketNotifiers.cend(); ++it)
            d->pollfds.append(qt_make_pollfd(it.key(), it.value().events()));

    // This must be last, as it's popped off the end below
    d->pollfds.append(d->threadPipe.prepare());

    int nevents = 0;

    switch (qt_safe_poll(d->pollfds.data(), d->pollfds.size(), tm)) {
    case -1:
        perror("qt_safe_poll");
        break;
    case 0:
        break;
    default:
        nevents += d->threadPipe.check(d->pollfds.takeLast());
        if (include_notifiers)
            nevents += d->activateSocketNotifiers();
        break;
    }

    if (include_timers)
        nevents += d->activateTimers();

    // return true if we handled events, false otherwise
    return (nevents > 0);
}

bool QEventDispatcherUNIX::hasPendingEvents()
{
    extern uint qGlobalPostedEventsCount(); // from qapplication.cpp
    return qGlobalPostedEventsCount();
}

int QEventDispatcherUNIX::remainingTime(int timerId)
{
#ifndef QT_NO_DEBUG
    if (timerId < 1) {
        qWarning("QEventDispatcherUNIX::remainingTime: invalid argument");
        return -1;
    }
#endif

    Q_D(QEventDispatcherUNIX);
    return d->timerList.timerRemainingTime(timerId);
}

void QEventDispatcherUNIX::wakeUp()
{
    Q_D(QEventDispatcherUNIX);
    d->threadPipe.wakeUp();
}

void QEventDispatcherUNIX::interrupt()
{
    Q_D(QEventDispatcherUNIX);
    d->interrupt.store(1);
    wakeUp();
}

void QEventDispatcherUNIX::flush()
{ }

QT_END_NAMESPACE

#include "moc_qeventdispatcher_unix_p.cpp"