Re: value uninitilized when using Parallel::ForkManager module

It seems to me that this code line:

($pwm_count_hash->{$pwm}) = count_pwm_num($pwm,$seq_1,$seq_2);
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is never executed, because of the next instruction of the previous line (unless $pm->start fails).

Je suis Charlie.

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Re^2: value uninitilized when using Parallel::ForkManager module by afoken (Chancellor) on Apr 14, 2015 at 16:07 UTC
It seems to me that this code line: `$pwm_count_hash->{$pwm}) = count_pwm_num($pwm,$seq_1,$seq_2);` is never executed, because of the next instruction of the previous line (unless $pm->start fails). This is how Parallel::ForkManager works: `$pm->start` hides a `fork()` call and returns true (the child's PID) in the parent process and false in the child process. `$pm->start and next` makes sure that all following code is executed only in the child process, `$pm->finish()` at the end of the loop hides `exit()` and makes sure that the loop is executed only once in the child process. (Actually, Parallel::ForkManager does a little bit more. See the documentation.) Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l] [select]
Re^3: value uninitilized when using Parallel::ForkManager module by Laurent_R (Canon) on Apr 14, 2015 at 17:45 UTC
Thank you very much for the information, afoken, I did not know, because I never used Parallel::ForkManager, but I should probably have guessed something like that, since I wrote forking programs, albeit quite sometime ago and not in Perl. Je suis Charlie.	[reply]