Почему heap повреждается в qt примере ?
Форум — Development
Создаю 2 потока, один из них пишет в QTableWidget, другой читает, применяю QMutex.
Сам поток:
void work1::started_thread()
{
qDebug() << "started_thread" << this << list.length();
qDebug() << "work currentThreadId" << QThread::currentThreadId() << "reader" << reader;
emit sendText("readerIs " + QString::number(reader) + " 0x" + QString::number((long long)QThread::currentThreadId(),16));
for(int i=0;i<10000;i++)
{
mutex->lock();
// qDebug() << i;
for(int j=0;j<list.length();j++)
{
QTableWidgetItem * item = list.at(j);
if(reader)
{
item->text();
// qDebug() << item->text();
item->text();
}
else
{
// qDebug() << "set" << i << j;
item->setText(QString::number(i+j) + "_" + name);
}
}
mutex->unlock();
// QThread::msleep(100);
}
}
По кнопке вызываю оба треда: передаю в них list, который содержит QTableWidgetItem элементы таблицы, оба потока пользуются общим QMutex.
w1->setList(list,"worker1",true,&mutex);
w2->setList(list,"worker2",false,&mutex);
emit operate1();
emit operate2();
Получаю ошибку разрушения кучи:
Треад пишущий падает тут:
Thread 6 (Thread 12712.0x1304):
#0 0x00007ffdc946f1d3 in ntdll!RtlIsZeroMemory () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
#1 0x00007ffdc9477f92 in ntdll!RtlpNtSetValueKey () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
#2 0x00007ffdc947827a in ntdll!RtlpNtSetValueKey () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
#3 0x00007ffdc947df01 in ntdll!RtlpNtSetValueKey () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
#4 0x00007ffdc939dbc1 in ntdll!RtlAllocateHeap () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
......
#15 0x0000000067f14279 in QTableWidgetItem::setData (this=0x24e66bc0, role=<optimized out>, value=...) at itemviews\qtablewidget.cpp:1397
roles = {d = 0x2871bf40}
model = 0x24dd2800
found = <optimized out>
#16 0x000000000040668a in QTableWidgetItem::setText (this=0x24e66bc0, atext=...) at C:/Qt/Qt5.12.0/5.12.0/mingw73_64/include/QtWidgets/qtablewidget.h:186
No locals.
#17 0x0000000000402a0d in work1::started_thread (this=0x1cfc8e60) at ..\TestCrashTable\work1.cpp:42
item = 0x24e66bc0
j = 43
i = 39
__PRETTY_FUNCTION__ = "void work1::started_thread()"
Тред читающий в этот момент висит на мьютексе:
Thread 5 (Thread 12712.0x413c):
#0 0x00007ffdc940cdf4 in ntdll!ZwWaitForSingleObject () from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
#1 0x00007ffdc6b01a5e in WaitForSingleObjectEx () from C:\WINDOWS\System32\KernelBase.dll
No symbol table info available.
#2 0x00000000011e82b4 in QMutexPrivate::wait (this=this@entry=0x24ecbbc8, timeout=timeout@entry=-1) at thread/qmutex_win.cpp:64
No locals.
#3 0x00000000011e84a6 in QBasicMutex::lockInternal (this=0x87fd50, timeout=-1) at thread\qmutex.cpp:573
copy = 0x24ecbbc8
d = 0x24ecbbc8
old_waiters = <optimized out>
#4 0x00000000011e8586 in QBasicMutex::lockInternal (this=0x47c) at thread\qmutex.cpp:489
No locals.
#5 0x00000000011e85f7 in QMutex::lock (this=<optimized out>) at thread\qmutex.cpp:227
current = <optimized out>
#6 0x000000000040291a in work1::started_thread (this=0x1cfc7f10) at ..\TestCrashTable\work1.cpp:26
i = 39
__PRETTY_FUNCTION__ = "void work1::started_thread()"
Хотелось бы понять, почему падает поток.