alarm comes from UNIX, and is based on a UNIX specific architechture, i.e. signals.

alarm does not work on the Activestate implementation of Perl on Windows, and that is well documented: in the ActiveState documentation "Windows quirks" Why doesn't signal handling work on Windows?".

There are also several nodes here: alarm not triggering SIGALRM on Windows 2003, Timeouts: Any alternative to alarm in Win32?, Re^2: alarm() on windows 2003, overview, Timeouts/timers on Win32 system. As perlport says "Don't count on signals or %SIG for anything.".

Some signals are implemented in the Microsoft C compilers, but only the absolute minimum to conform to the ANSI C standard. Those signals supported do not include SIGALRM.

Windows does have a rich timer API based around Waitable Timers, designed to be called from C/C++. See http://msdn.microsoft.com/en-us/library/ms687012(v=vs.85).aspx.

In reply to Re: Alarms with ActivePerl do not work properly by cdarke
in thread Alarms with ActivePerl do not work properly by heiermann

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