[PHP-DEV] setjmp usage

[Rasmus Lerdorf]

We are using setjmp(__bailout) in zend_try, but setjmp behaves 
differently on BSD and Linux.  POSIX doesn't specify whether the signal 
mask should be saved or not for this call, so different operating 
systems do different things here.  I think it would be more consistent 
if we used sigsetjmp(__bailout,0) to always specify that we don't need 
to store the signal mask.  This avoids an expensive sigprocmask syscall.

-Rasmus
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