Re: multi-threaded compiling

On Mon, Mar 11, 2024, 22:36 alex xmb sw ratchev <[email protected]> wrote:

> ~ $ bash xmb.smallt
> pid 14333 cmd t2 returned 3
> pid 14332 cmd sleep 1 returned 0
>
> ~ $ cat xmb.smallt
> #!/bin/bash
>
>  run() {
> local IFS=' ' run=$*
> eval "$run &"
> me[$!]=$run
>  }
>

alternativly to mention aliases usage

shopt -s expand_aliases

then in func
IFS=' '
alias torun=$*

then
torun &

 wa() {
> local pid
> wait -n -p pid
> printf %s\\n "pid $pid cmd ${me[pid]} returned $?"
>  }
>
>  t2() {
> sleep .75
> return 3
>  }
>
> run sleep 1
> run t2
>
> wa
> wa
>
> On Mon, Mar 11, 2024, 22:24 Greg Wooledge <[email protected]> wrote:
>
>> On Mon, Mar 11, 2024 at 10:19:26PM +0100, Mischa Baars wrote:
>> > On Mon, 11 Mar 2024, 21:08 Kerin Millar, <[email protected]> wrote:
>> > > The pid can be obtained with the -p option, as of 5.1. Below is a
>> > > synthetic example of how it might be put into practice.
>>
>> I'd forgotten about that one.  A recent addition, and one I've never used
>> yet.
>>
>> > > #!/bin/bash
>> > >
>> > > declare -A job_by status_by
>> > > max_jobs=4
>> > > jobs=0
>> > >
>> > > wait_next() {
>> > >         local pid
>> > >         wait -n -p pid
>> > >         status_by[$pid]=$?
>> > >
>> >
>> > How exactly is this indexing implemented internally? Does a first
>> number on
>> > index n take m bits (using a linked list) or does it take n * m bits
>> (using
>> > realloc(3))?
>>
>> "declare -A" makes it an associative array (hash table).
>>
>> Without that declare -A, it would be a sparsely indexed array.
>>
>> In either case, it doesn't just blindly allocate millions of bytes of
>> memory.  It uses something slimmer.
>>
>>