问题
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Will exit() or an exception prevent an end-of-scope destructor from being called?
In C++, when the application calls exit(3) are the destructors on the stack supposed to be run to unwind the stack?
回答1:
No, most destructors are not run on exit().
C++98 §18.3/8 discusses this.
Essentially, when exit is called static objects are destroyed, atexit handlers are executed, open C streams are flushed and closed, and files created by tmpfile are removed. Local automatic objects are not destroyed. I.e., no stack unwinding.
Calling abort lets even less happen: no cleanup whatsoever.
回答2:
If your OS is reasonable (Unix, Linux, or a recent Windows), calling exit() tells the kernel to de-allocate all the processes' memory. The stack doesn't need to be unwound; it will simply cease to exist.
来源：https://stackoverflow.com/questions/7054685/are-destructors-run-when-calling-exit