Re: multi-threaded compiling

[alex xmb sw ratchev]

the logic between my code

1 threads_max
2 loop
3 inside loop , do if run is > than threads_max then wait -n one
then 4 spawn thread

i dont get ur points

On Mon, Mar 11, 2024, 19:55 Mischa Baars <mjbaars1977.backup@gmail.com>
wrote:

> Sorry. I mean:
>
> for (( i=0; i<32; i++ )); do exit $i & done; for (( i=0; i<32; i++ )); do
> wait -n; echo $?; done;
>
> doesn't function. With an ampersand instead of a semicolon. Why does it
> function when called from a script and why does it fail when called from
> the command line?
>
> On Mon, Mar 11, 2024 at 7:46 PM Mischa Baars <mjbaars1977.backup@gmail.com>
> wrote:
>
>> You mean:
>>
>> for (( i=0; i<32; i++ )); do exit $i & wait -n; echo $?; done;
>>
>> with one command and one wait in a single loop. And this does execute on
>> the command line. How interesting!
>>
>> for (( i=0; i<32; i++ )); do exit $i; done; for (( i=0; i<32; i++ )); do
>> wait -n; echo $?; done;
>>
>> Because this doesn't and to be honest, I needed the pid and its index to
>> retrieve gcc's output from a log file array afterwards.
>>
>> On Mon, Mar 11, 2024 at 7:25 PM alex xmb sw ratchev <fxmbsw7@gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Mon, Mar 11, 2024, 19:22 Mischa Baars <mjbaars1977.backup@gmail.com>
>>> wrote:
>>>
>>>> On Mon, Mar 11, 2024 at 6:22 PM alex xmb sw ratchev <fxmbsw7@gmail.com>
>>>> wrote:
>>>>
>>>>> i also completly dont get ur issue
>>>>>
>>>>> f=( a.c b.c .. ) threads=$( nproc ) i=-1 r=
>>>>>
>>>>>   while [[ -v f[++i] ]] ; do
>>>>>  (( ++r > threads )) &&
>>>>> wait -n
>>>>> gcc -c "${f[i]}" &
>>>>>   done
>>>>>
>>>>
>>>> How nice!
>>>>
>>>> wait -n exit 1 & echo $?
>>>>
>>>
>>> doesnt need a pid
>>> 1 : 1 as i wrote it , excepts add 'wait' as new last line
>>>
>>> You got me the solution :) Except that wait expects a pid after -n.
>>>>
>>>> Maybe
>>>>
>>>> for (( i=0; i<32; i++ )); do exit 1 & wait -n $!; echo $?; done;
>>>>
>>>> is what you meant? The equivalence of sequential execution?
>>>>
>>>> First think, then do magic.
>>>>
>>>>
>>>>>
>>>>>
>>>>
>>>>>
>>>>> On Mon, Mar 11, 2024, 18:16 Mischa Baars <mjbaars1977.backup@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hello Paul,
>>>>>>
>>>>>> It seems I'm awake a little longer than you are.
>>>>>>
>>>>>> The second paragraph as you see it, belongs to 1)
>>>>>> The fourth paragraph as you see it, belongs to 2)
>>>>>>
>>>>>> The actual command invocations (a Makefile, a make.sh script) can be
>>>>>> found
>>>>>> in the attachment, as indicated on the first line of the mail. In the
>>>>>> attachment there are two directories, one and two, belonging to 1)
>>>>>> and 2)
>>>>>> respectively.
>>>>>>
>>>>>> I'm not into Vulcan mindmelds, so I hope everything from the first
>>>>>> mail
>>>>>> makes sense to you and everyone on this mailing list now.
>>>>>>
>>>>>> Best regards,
>>>>>> Mischa Baars.
>>>>>>
>>>>>> On Mon, Mar 11, 2024 at 5:01 PM Paul Smith <psmith@gnu.org> wrote:
>>>>>>
>>>>>> > On Mon, 2024-03-11 at 09:56 +0100, Mischa Baars wrote:
>>>>>> > > I've attached the problem. It consists of two parts:
>>>>>> > >
>>>>>> > > 1) multi-threaded bash script and / or multi-threaded Makefile
>>>>>> > >
>>>>>> > > Running bash script functions as expected, but executing the same
>>>>>> > > line of code with make and / or the command line, does not
>>>>>> function.
>>>>>> > > Perhaps someone could explain to me why?
>>>>>> > >
>>>>>> > > 2) passing a string argument from a bash script and / or Makefile
>>>>>> to
>>>>>> > > the gcc -D option
>>>>>> > >
>>>>>> > > Running the makefile functions as expected, but I have not been
>>>>>> able
>>>>>> > > to get similar code to work from a bash script. Can someone please
>>>>>> > > explain to me what I'm doing wrong?
>>>>>> >
>>>>>> > I don't understand the problem.  In the third paragraph above you
>>>>>> say
>>>>>> > the bash script works as expected and the makefile doesn't work,
>>>>>> but in
>>>>>> > the last paragraph you say that the makefile works as expected but
>>>>>> you
>>>>>> > can't get it to work in bash.
>>>>>> >
>>>>>> > Please provide actual command invocations (cut and pasted) showing
>>>>>> the
>>>>>> > output you received and explaining exactly what is wrong with it.
>>>>>> >
>>>>>> > But before you do that, be aware that make does NOT invoke
>>>>>> /bin/bash as
>>>>>> > its shell.  It invokes /bin/sh.  On some systems /bin/sh is
>>>>>> actually an
>>>>>> > alias for bash.  On other systems it isn't.
>>>>>> >
>>>>>> > If you want your makefile to always use bash as its shell, you
>>>>>> should
>>>>>> > add an explicit:
>>>>>> >
>>>>>> >     SHELL := /bin/bash
>>>>>> >
>>>>>> > to your makefile to force it.  Maybe that will solve your problem.
>>>>>> If
>>>>>> > not we'll need details such as I mention above.
>>>>>> >
>>>>>>
>>>>>