Author: mjevans
Date: Fri Apr 30 05:16:17 2010
New Revision: 13940
Modified:
dbi/trunk/DBI.pm
Log:
Minor change to the signal handling example to add comment, fix reference
to inner/outer eval and remove double \n added in second die.
Modified: dbi/trunk/DBI.pm
==============================================================================
--- dbi/trunk/DBI.pm (original)
+++ dbi/trunk/DBI.pm Fri Apr 30 05:16:17 2010
@@ -7192,15 +7192,16 @@
alarm($seconds);
... code to execute with timeout here (which may die) ...
};
+ # outer eval catches alarm that might fire JUST before this alarm(0)
alarm(0); # cancel alarm (if code ran fast)
- die "$...@\n" if $@;
+ die "$@" if $@;
};
if ( $@ eq "TIMEOUT\n" ) { ... }
elsif ($@) { ... } # some other error
-The second (inner) eval is used to avoid the unlikey but possible
+The first (outer) eval is used to avoid the unlikey but possible
chance that the "code to execute" dies and the alarm fires before it
-is cancelled. Without the inner eval, if this happened your program
+is cancelled. Without the outer eval, if this happened your program
will die if you have no ALRM handler or a non-local alarm handler
will be called.
