使用 qtconcurrent 并调用 QTime:currentTime 生成异常
我似乎只在使用 Qtconcurrent::run 创建的线程中生成异常
我有一个名为 FPSengine 的类，它有一个名为 FPSengine::getData() 的方法，由主线程和 3 个其他线程（2 个 QThreads 和1 使用 QtConcurrent::run()) 制作。在 FPSengine::getData() 内部，我调用 QTime::currentTime()。如果我从主线程或 QThread 之一调用 FPSengine::getData() ，我不会遇到任何问题，但当我从使用 Qtconcurrent::run() 创建的线程调用 FPSengine::getData() 时，有时会出现异常。 Qtconcurrent 或 QTime:currentTime() 甚至 tzset （由 QTime::currentTime 从 gdb 堆栈显示的内容调用）是否有问题？ 或者我的代码有问题。这是失败线程的堆栈信息：
0 提高 /lib/libc.so.6 0
1 中止 /lib/libc.so.6 0
2 ?? /lib/libc.so.6 0
3 ?? /lib/libc.so.6 0
4 个免费 /lib/libc.so.6 0
5 ?? /lib/libc.so.6 0
6 tzset /lib/libc.so.6 0
7 QTime::currentTime() /usr/lib/libQtCore.so.4 0
8 FPSengine::xmitData FPSengine2.cpp 93
9 FPSengine::getData FPSengine2.cpp 21
10 threadDatalog::run threaddatalog.cpp 109
11 ?? /usr/lib/libQtCore.so.4 0
12 start_thread /lib/libpthread.so.0 0
13 克隆/lib/libc.so.6 0 14 ?? 0
I seem to be getting an exception generated only with a thread created with Qtconcurrent::run
I have a class named FPSengine which has a method named FPSengine::getData() that is called by the main thread and 3 other threads (2 QThreads and 1 made with QtConcurrent::run()). Inside FPSengine::getData() I call QTime::currentTime(). If I call FPSengine::getData() from the main thread or one of the QThreads I dont have any problems but when I call FPSengine::getData() from the thread created with Qtconcurrent::run() I sometimes get an exception. Could there be something wrong with Qtconcurrent or QTime:currentTime() or even tzset (which is called by QTime::currentTime from what the gdb stack shows)?
Or is there something wrong with my code. Here is the stack info of the failing thread:
0 raise /lib/libc.so.6 0
1 abort /lib/libc.so.6 0
2 ?? /lib/libc.so.6 0
3 ?? /lib/libc.so.6 0
4 free /lib/libc.so.6 0
5 ?? /lib/libc.so.6 0
6 tzset /lib/libc.so.6 0
7 QTime::currentTime() /usr/lib/libQtCore.so.4 0
8 FPSengine::xmitData FPSengine2.cpp 93
9 FPSengine::getData FPSengine2.cpp 21
10 threadDatalog::run threaddatalog.cpp 109
11 ?? /usr/lib/libQtCore.so.4 0
12 start_thread /lib/libpthread.so.0 0
13 clone /lib/libc.so.6 0
14 ?? 0
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QTime::currentTime()（或者任何QTime函数，实际上）没有被记录为并发。另外，我怀疑底层调用（tzset）是否能够很好地处理并发性。因此，您可能需要在调用周围添加一些保护（例如互斥体）以获取当前时间，以防止同时访问。我不知道这是否能解决您的问题，但可能会有所帮助。QTime::currentTime()(or any of theQTimefunctions, really) are not documented as being concurrent. Also, I doubt that the underlying call (tzset) is designed to handle concurrency very well. Accordingly, you'll probably need to add some protection, such as a mutex, around the call to get the current time to prevent simultaneous access. I don't know if this will solve your issue, but it will probably help.