* fc -ap -R stalls when called from sched
@ 2016-09-11 8:58 Sebastian Gniazdowski
2016-09-11 9:01 ` Sebastian Gniazdowski
2016-09-12 0:17 ` Bart Schaefer
0 siblings, 2 replies; 4+ messages in thread
From: Sebastian Gniazdowski @ 2016-09-11 8:58 UTC (permalink / raw)
To: Zsh hackers list
Hello,
I call function __convey_on_period_passed() from sched +1 mechanism.
There, I read an IO file (file used for data conveying). I use the
neat trick that worked for me in past, but not now:
# Read input using history mechanism
local -a commands
() { fc -ap -R "$datafile"; commands=( ${history[@]} ) }
Shell stalls for ~10 seconds, then continues with data correctly read.
Whole source with debug marks is here:
https://github.com/psprint/zconvey/blob/001a5378177dcfdd0de388e19f5c7ca067c0a89c/zconvey.plugin.zsh#L174-L183
Asciinema showing the effect:
https://asciinema.org/a/9mfxg2j1jcwvoo7tb5x6bagr4
Removing anonymous function doesn't help. Doing normal load via
commands=( "${(@f)"$(<$datafile)"}" ) does help.
The plugin is for: a) assigning IDs and names to Zsh sessions b) doing
"zconvey -n Devel vim ~/.zshrc" to fire up command on Zsh session
named "Devel" (not implemented yet, thus a manual print -rl -- is used
to fill IO file).
Best regards,
Sebastian Gniazdowski
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: fc -ap -R stalls when called from sched
2016-09-11 8:58 fc -ap -R stalls when called from sched Sebastian Gniazdowski
@ 2016-09-11 9:01 ` Sebastian Gniazdowski
2016-09-11 9:14 ` Sebastian Gniazdowski
2016-09-12 0:17 ` Bart Schaefer
1 sibling, 1 reply; 4+ messages in thread
From: Sebastian Gniazdowski @ 2016-09-11 9:01 UTC (permalink / raw)
To: Zsh hackers list
PS. Thought that I could provide a minimum test case. However, following:
myfunction() { local -a arr; fc -ap -R ~/.zshrc; arr=( ${history[@]}
); print -rl -- "Read:" "${(@)arr[1,3]}"; }
sched +1 myfunction
works fine...
On 11 September 2016 at 10:58, Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
> Hello,
> I call function __convey_on_period_passed() from sched +1 mechanism.
> There, I read an IO file (file used for data conveying). I use the
> neat trick that worked for me in past, but not now:
>
> # Read input using history mechanism
> local -a commands
> () { fc -ap -R "$datafile"; commands=( ${history[@]} ) }
>
> Shell stalls for ~10 seconds, then continues with data correctly read.
> Whole source with debug marks is here:
>
> https://github.com/psprint/zconvey/blob/001a5378177dcfdd0de388e19f5c7ca067c0a89c/zconvey.plugin.zsh#L174-L183
>
> Asciinema showing the effect:
>
> https://asciinema.org/a/9mfxg2j1jcwvoo7tb5x6bagr4
>
> Removing anonymous function doesn't help. Doing normal load via
> commands=( "${(@f)"$(<$datafile)"}" ) does help.
>
>
> The plugin is for: a) assigning IDs and names to Zsh sessions b) doing
> "zconvey -n Devel vim ~/.zshrc" to fire up command on Zsh session
> named "Devel" (not implemented yet, thus a manual print -rl -- is used
> to fill IO file).
>
> Best regards,
> Sebastian Gniazdowski
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: fc -ap -R stalls when called from sched
2016-09-11 9:01 ` Sebastian Gniazdowski
@ 2016-09-11 9:14 ` Sebastian Gniazdowski
0 siblings, 0 replies; 4+ messages in thread
From: Sebastian Gniazdowski @ 2016-09-11 9:14 UTC (permalink / raw)
To: Zsh hackers list
PS. The commit with debug marks etc. is: 001a537
Best regards,
Sebastian Gniazdowski
On 11 September 2016 at 11:01, Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
> PS. Thought that I could provide a minimum test case. However, following:
>
> myfunction() { local -a arr; fc -ap -R ~/.zshrc; arr=( ${history[@]}
> ); print -rl -- "Read:" "${(@)arr[1,3]}"; }
> sched +1 myfunction
>
> works fine...
>
>
> On 11 September 2016 at 10:58, Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
>> Hello,
>> I call function __convey_on_period_passed() from sched +1 mechanism.
>> There, I read an IO file (file used for data conveying). I use the
>> neat trick that worked for me in past, but not now:
>>
>> # Read input using history mechanism
>> local -a commands
>> () { fc -ap -R "$datafile"; commands=( ${history[@]} ) }
>>
>> Shell stalls for ~10 seconds, then continues with data correctly read.
>> Whole source with debug marks is here:
>>
>> https://github.com/psprint/zconvey/blob/001a5378177dcfdd0de388e19f5c7ca067c0a89c/zconvey.plugin.zsh#L174-L183
>>
>> Asciinema showing the effect:
>>
>> https://asciinema.org/a/9mfxg2j1jcwvoo7tb5x6bagr4
>>
>> Removing anonymous function doesn't help. Doing normal load via
>> commands=( "${(@f)"$(<$datafile)"}" ) does help.
>>
>>
>> The plugin is for: a) assigning IDs and names to Zsh sessions b) doing
>> "zconvey -n Devel vim ~/.zshrc" to fire up command on Zsh session
>> named "Devel" (not implemented yet, thus a manual print -rl -- is used
>> to fill IO file).
>>
>> Best regards,
>> Sebastian Gniazdowski
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: fc -ap -R stalls when called from sched
2016-09-11 8:58 fc -ap -R stalls when called from sched Sebastian Gniazdowski
2016-09-11 9:01 ` Sebastian Gniazdowski
@ 2016-09-12 0:17 ` Bart Schaefer
1 sibling, 0 replies; 4+ messages in thread
From: Bart Schaefer @ 2016-09-12 0:17 UTC (permalink / raw)
To: Zsh hackers list
On Sep 11, 10:58am, Sebastian Gniazdowski wrote:
}
} I call function __convey_on_period_passed() from sched +1 mechanism.
}
} # Read input using history mechanism
} local -a commands
} () { fc -ap -R "$datafile"; commands=( ${history[@]} ) }
}
} Shell stalls for ~10 seconds, then continues with data correctly read.
The most likely thing going on is that lockhistfile() is spinning on
repeated attempts to have exclusive access to the file.
} Removing anonymous function doesn't help. Doing normal load via
} commands=( "${(@f)"$(<$datafile)"}" ) does help.
Since opening for read with redirection doesn't attempt to lock, this
would make sense in relation to the previous hypothesis.
} The plugin is for: a) assigning IDs and names to Zsh sessions b) doing
} "zconvey -n Devel vim ~/.zshrc" to fire up command on Zsh session
} named "Devel" (not implemented yet, thus a manual print -rl -- is used
} to fill IO file).
If you're going to read the file with "fc -R" why not write it also with
"fc -W" or "fc -A"? Then the history mechanism would handle all of your
locking and you wouldn't need "zsystem flock" or its workaround.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-09-12 0:17 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2016-09-11 8:58 fc -ap -R stalls when called from sched Sebastian Gniazdowski
2016-09-11 9:01 ` Sebastian Gniazdowski
2016-09-11 9:14 ` Sebastian Gniazdowski
2016-09-12 0:17 ` Bart Schaefer
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