将信号转换为 NSException 仅在第一次有效

发布于 2024-09-11 19:19:07 字数 507 浏览 8 评论 0原文

看来，当BSD信号转换为抛出异常时，它只在第一次起作用，而在随后的次数中不起作用。

我尝试通过在调用 NSApplicationMain 之前在 main 方法中进行的以下调用将信号转换为异常：

[[NSExceptionHandler defaultExceptionHandler] setExceptionHandlingMask:NSHandleUncaughtSystemExceptionMask];

这在第一次发生信号时确实有效。但第二次发生时，线程只是挂起，但仍然允许其他线程运行。有什么办法可以让我每次都这样吗？

顺便说一句，我通过一个按钮测试了这一点，该按钮通过写入地址零来触发 SIGSEGV 违规：

char* p = NULL;
*p = 'x';

我想要的是每次都抛出异常 - 就像 Java 的 NullPointerException 一样代码>.但目前它仅在第一次执行时有效，随后线程会挂起。

原文

It seems that when BSD signals are converted to thrown exceptions, it only work the first time but not subsequent times.

I tried to convert signals to exception via the following call I made in the main method just before calling NSApplicationMain :

[[NSExceptionHandler defaultExceptionHandler] setExceptionHandlingMask:NSHandleUncaughtSystemExceptionMask];

This does work the first time a signal occurred. But the second time it happens, the thread just hangs but still allowing other threads to run. Is there any way I can make this happen each time?

Btw, I tested this by having a button that triggers a SIGSEGV violation by writing to address zero:

char* p = NULL;
*p = 'x';

What I want is for that to throw an exception every time -- just like Java's NullPointerException. But currently it only works the first time it is executed, subsequently the thread hangs.

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