Re: [gentoo-dev] multiprocessing.eclass: doing parallel work in bash

[Mike Frysinger]

On Sunday 03 June 2012 18:16:30 Zac Medico wrote:
> On 06/02/2012 10:08 PM, Mike Frysinger wrote:
> > # @FUNCTION: _multijob_fork # @INTERNAL # @DESCRIPTION: # Do the
> > actual book keeping. _multijob_fork() { [[ $# -eq 1 ]] || die
> > "incorrect number of arguments"
> >
> > local ret=0 [[ $1 == "pre" ]] && : $(( ++mj_num_jobs ))
> > if [[ ${mj_num_jobs} -ge ${mj_max_jobs} ]] ; then
> >   multijob_finish_one
> > 	  ret=$?
> > fi
> > [[ $1 == "post" ]] && : $(( ++mj_num_jobs ))
> > return ${ret}
>
> The "pre" logic seems wrong. Consider an initial state of
> mj_num_jobs=0 and mj_max_jobs=1. It will increment mj_num_jobs to 1,
> so [[ 1 -ge 1 ]] is true, and then call multijob_finish_one even
> though no jobs have started yet? Wouldn't that deadlock
> multijob_finish_one, as it waits for a reply from a job that doesn't
> exist yet?

yes, i inverted the cases in this func
-mike