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tst_Q*Application: avoid race conditions during exitFromThread

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Amends commit bfbd1a281dd00c47df315c06e895bf5d53cd8764. I've noticed
this on my Mac, because the main thread crashed at the same time as the
exitFromThread() thread was exiting and was running ~QLibraryStore:

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x106)
  * frame #0: 0x00007ff8020533be libobjc.A.dylib`getMethodNoSuper_nolock(objc_class*, objc_selector*) + 47
...
    frame #19: 0x0000000103839694 QtCore`QCoreApplication::exec() at qcoreapplication.cpp:1454:32
    frame #20: 0x0000000101fc94ea QtGui`QGuiApplication::exec() at qguiapplication.cpp:1993:12
    frame #21: 0x0000000100004b59 apphelper`exitFromThread(argc=1, argv=0x00007ff7bfeff318) at apphelper.cpp:50:5
  thread #8, name = 'QThread'
...
    frame #11: 0x00007ff8020c4f94 dyld`dyld4::APIs::dlclose(void*) + 178
    frame #12: 0x0000000103e82476 QtCore`QLibraryPrivate::unload_sys(this=0x0000600001254160) at qlibrary_unix.cpp:252:24
    frame #13: 0x0000000103e793fc QtCore`QLibraryPrivate::unload(this=0x0000600001254160, flag=UnloadSys) at qlibrary.cpp:561:36
    frame #14: 0x00000001039740c8 QtCore`QFactoryLoader::~QFactoryLoader(this=0x00000001029e5e70) at qfactoryloader.cpp:438:21
    frame #15: 0x00000001039745e9 QtCore`QFactoryLoader::~QFactoryLoader(this=0x00000001029e5e70) at qfactoryloader.cpp:425:1
    frame #16: 0x0000000101eb723c QtGui`void std::__1::__destroy_at[abi:sn180100]<QFactoryLoader, 0>(__loc=0x00000001029e5e70) at construct_at.h:67:11
    frame #17: 0x0000000101eb7209 QtGui`void std::__1::destroy_at[abi:sn180100]<QFactoryLoader, 0>(__loc=0x00000001029e5e70) at construct_at.h💯3
    frame #18: 0x0000000102046762 QtGui`QtGlobalStatic::Storage<QFactoryLoader, (anonymous namespace)::Q_QGS_piLoader>::destroyYourself(nextState=Destroyed) at qglobalstatic.h:61:9
    frame #19: 0x0000000102046736 QtGui`QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_piLoader, (anonymous namespace)::Q_QGS_piLoader>::~Holder(this=0x00000001029e5e61) at qglobalstatic.h:83:9
    frame #20: 0x00000001020465d9 QtGui`QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_piLoader, (anonymous namespace)::Q_QGS_piLoader>::~Holder(this=0x00000001029e5e61) at qglobalstatic.h:82:5
    frame #21: 0x00007ff8022f4231 libsystem_c.dylib`__cxa_finalize_ranges + 402
    frame #22: 0x00007ff8022f4052 libsystem_c.dylib`exit + 35
    frame #23: 0x000000010000755a apphelper`exitFromThread(int, char**)::$_1::operator()(this=0x000060000175612c) const at apphelper.cpp:47:9

Pick-to: 6.9 6.9.0 6.8
Change-Id: Ib1c72c7975b247cc2d17fffd6c5de89a95c22dad
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
This commit is contained in:
Thiago Macieira 2025-03-05 09:59:24 -08:00
parent 0f9860618f
commit e6a6757c14
1 changed files with 19 additions and 1 deletions
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20
tests/auto/corelib/kernel/qcoreapplication/apphelper.cpp
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@ -10,6 +10,12 @@
#include <stdlib.h>
#include <stdio.h>
#ifdef Q_OS_WIN
# include <io.h>
#else
# include <sys/types.h>
# include <unistd.h>
#endif
#if defined(QT_WIDGETS_LIB)
#include <QtWidgets/QApplication>
@ -23,6 +29,10 @@ using TestApplication = QGuiApplication;
using TestApplication = QCoreApplication;
#endif
#ifndef STDIN_FILENO
# define STDIN_FILENO 0
#endif
#include "maybeshow.h"
static int exitFromEventLoop(int argc, char **argv)
@ -42,7 +52,15 @@ static int exitFromThread(int argc, char **argv)
fprintf(stderr, "QThread::currentThread is null!\n");
::exit(EXIT_SUCCESS);
});
QTimer::singleShot(200, thr, [&thr] { thr->start(); });
QTimer::singleShot(200, thr, [&thr] {
thr->start();
// block the GUI forever, otherwise the unloading of the QPA plugins
// could cause a crash if something is running.
char c;
int r = read(STDIN_FILENO, &c, 1);
Q_UNUSED(r);
});
app.exec();
Q_UNREACHABLE_RETURN(EXIT_FAILURE);
}