If the only code is $integer++, it doesn't take an "internals specialist" to realize that there is about 0 chance of memory corruption or segfaults.

Wanna bet?

Unless $integer has already just been assigned an integer value, it will currently be of type SVt_NULL; the first ++ will upgrade it to SVt_IV, which may cause a malloc. If the signal occured during a call to malloc, then Boom!

Of course you could avoid this by ensuring that there is the initial assignment $integer=0 before the signal handler is called, but even that isn't enough. A Perl-level signal handler calls a *sub* not a statement, and entering a sub involves pushing things onto the context and save stacks, which can again trigger mallocs.

In reply to Re: Re: Re: •Re: the unsafe signals controversy by Anonymous Monk
in thread the unsafe signals controversy by jfroebe

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