我将一堆QWebView渲染到一个小部件上。有一点我开始收到错误QThread::start: Failed to create thread (The access code is invalid.)。看一下Qt源代码，看来_beginthreadex返回一个空句柄而errno是ERROR_INVALID_ACCESS，但我不明白为什么。
以下是打印错误时的回溯：
0 qErrnoWarning qglobal.cpp 2451 0x69ccdd3c 1 QThread::start qthread_win.cpp 469 0x69cd5831 2 QThreadPoolPrivate::tryStart qthreadpool.cpp 203 0x69ccc3f5 3 QThreadPool::start qthreadpool.cpp 474 0x69cccdf4 4 QHostInfoLookupManager::work qhostinfo.cpp 633 0x6cb9b071 5 QHostInfoLookupManager::scheduleLookup qhostinfo.cpp 652 0x6cb9b143 6 QHostInfo::lookupHost qhostinfo.cpp 202 0x6cb9a220 7 qt_qhostinfo_lookup qhostinfo.cpp 722 0x6cb9b4b6 8 QAbstractSocket::connectToHostImplementation qabstractsocket.cpp 1427 0x6cbb17f5 9 QAbstractSocket::qt_static_metacall moc_qabstractsocket.cpp 166 0x6cbb4925 10 QMetaMethod::invoke qmetaobject.cpp 1664 0x69dc784f 11 QMetaObject::invokeMethod qmetaobject.cpp 1179 0x69dc6d6b 12 QMetaObject::invokeMethod qobjectdefs.h 418 0x6cd361dd 13 QAbstractSocket::connectToHost qabstractsocket.cpp 1342 0x6cbb13b3 14 QSslSocket::connectToHostImplementation qsslsocket.cpp 1744 0x6cbc7340 15 QSslSocket::qt_static_metacall moc_qsslsocket.cpp 91 0x6cbc93cf 16 QMetaMethod::invoke qmetaobject.cpp 1664 0x69dc784f 17 QMetaObject::invokeMethod qmetaobject.cpp 1179 0x69dc6d6b 18 QMetaObject::invokeMethod qobjectdefs.h 418 0x6cd361dd 19 QAbstractSocket::connectToHost qabstractsocket.cpp 1342 0x6cbb13b3 20 QSslSocket::connectToHostEncrypted qsslsocket.cpp 422 0x6cbc55e1 21 QHttpNetworkConnectionChannel::ensureConnection qhttpnetworkconnectionchannel.cpp 607 0x6cb6191f 22 QHttpNetworkConnectionPrivate::_q_startNextRequest qhttpnetworkconnection.cpp 862 0x6cb5e92c 23 QHttpNetworkConnectionPrivate::queueRequest qhttpnetworkconnection.cpp 501 0x6cb5c57d 24 QHttpNetworkConnection::sendRequest qhttpnetworkconnection.cpp 931 0x6cb5edf2 25 QHttpThreadDelegate::startRequest qhttpthreaddelegate.cpp 291 0x6cb8912a 26 QHttpThreadDelegate::qt_static_metacall moc_qhttpthreaddelegate_p.cpp 113 0x6cbd147c 27 QMetaCallEvent::placeMetaCall qobject.cpp 525 0x69dcf91c 28 QObject::event qobject.cpp 1195 0x69dd08db 29 QApplicationPrivate::notify_helper qapplication.cpp 4551 0x2582f44 30 QApplication::notify qapplication.cpp 3933 0x25808b7 31 QCoreApplication::notifyInternal qcoreapplication.cpp 915 0x69dc0dc6 32 QCoreApplication::sendEvent qcoreapplication.h 231 0x69e35185 33 QCoreApplicationPrivate::sendPostedEvents qcoreapplication.cpp 1539 0x69dc1d2a 34 qt_internal_proc qeventdispatcher_win.cpp 496 0x69de2590 35 USER32!OffsetRect C:\Windows\syswow64\user32.dll 0 0x74cc62fa 36 ?? 0 0x152404 37 ?? 0 0x401 38 ?? 0
通话时的代码如下：
d->handle = (Qt::HANDLE) _beginthreadex(NULL, d->stackSize, QThreadPrivate::start, //d->stackSize is 0
this, CREATE_SUSPENDED, &(d->id));
if (!d->handle) {
qErrnoWarning(errno, "QThread::start: Failed to create thread");
d->running = false;
d->finished = true;
return;
}为什么会发生这种情况，我该如何解决？
编辑：另外值得注意的是，在这一点上确实有500个线程。
答案 0 :(得分：4)
在创建500个线程后，很有可能在进程中（对于线程堆栈）耗尽了空闲地址空间。在32位Windows上，默认情况下进程只获得2GB的地址空间（地址空间的上半部分是为内核保留的）。 500个1MB线程堆栈（默认大小，Qt可能更高或更低）加上您的进程所做的所有其他分配可以很容易地使用它。
有关详情，请参阅this Old New Thing article。
可能的修复：