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devel / comp.lang.tcl / Re: thread::create create 2 system threads instead of one

SubjectAuthor
* thread::create create 2 system threads instead of oneОлег Н.
`* Re: thread::create create 2 system threads instead of oneHarald Oehlmann
 `- Re: thread::create create 2 system threads instead of oneОлег Н.

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thread::create create 2 system threads instead of one

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Subject: thread::create create 2 system threads instead of one
From: oleg.n4yt@gmail.com (Олег Н.)
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 by: Олег Н. - Thu, 22 Feb 2024 09:10 UTC

Hi, all.

Can anybody explain why first call of thread::create makes 2 system threads instead of one?

For example, we have t.tcl script:
~$ cat t.tcl
#!/usr/bin/tclsh

package require Thread

puts "stage1"
after 10000
thread::create {thread::wait}

puts "stage2"
after 10000

thread::create {thread::wait}

puts "stage3"
after 10000

We run it. And check system threads on every stage change:
~$ ps -aL | grep t.tcl
8134 8134 pts/2 00:00:00 t.tcl
~$ ps -aL | grep t.tcl
8134 8134 pts/2 00:00:00 t.tcl
8134 8372 pts/2 00:00:00 t.tcl
8134 8373 pts/2 00:00:00 t.tcl
~$ ps -aL | grep t.tcl
8134 8134 pts/2 00:00:00 t.tcl
8134 8372 pts/2 00:00:00 t.tcl
8134 8373 pts/2 00:00:00 t.tcl
8134 8605 pts/2 00:00:00 t.tcl

Re: thread::create create 2 system threads instead of one

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From: wortkarg3@yahoo.com (Harald Oehlmann)
Newsgroups: comp.lang.tcl
Subject: Re: thread::create create 2 system threads instead of one
Date: Thu, 22 Feb 2024 10:20:21 +0100
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 by: Harald Oehlmann - Thu, 22 Feb 2024 09:20 UTC

Am 22.02.2024 um 10:10 schrieb Олег Н.:
> Hi, all.
>
> Can anybody explain why first call of thread::create makes 2 system threads instead of one?
>
> For example, we have t.tcl script:
> ~$ cat t.tcl
> #!/usr/bin/tclsh
>
> package require Thread
>
> puts "stage1"
> after 10000
> thread::create {thread::wait}
>
> puts "stage2"
> after 10000
>
> thread::create {thread::wait}
>
> puts "stage3"
> after 10000
>
> We run it. And check system threads on every stage change:
> ~$ ps -aL | grep t.tcl
> 8134 8134 pts/2 00:00:00 t.tcl
> ~$ ps -aL | grep t.tcl
> 8134 8134 pts/2 00:00:00 t.tcl
> 8134 8372 pts/2 00:00:00 t.tcl
> 8134 8373 pts/2 00:00:00 t.tcl
> ~$ ps -aL | grep t.tcl
> 8134 8134 pts/2 00:00:00 t.tcl
> 8134 8372 pts/2 00:00:00 t.tcl
> 8134 8373 pts/2 00:00:00 t.tcl
> 8134 8605 pts/2 00:00:00 t.tcl
>

Hi Oleg,
what is your platform? If it is linux, which threadding system was
compiled in (pthreads) (found by the configure script).

Take care,
Harald

Re: thread::create create 2 system threads instead of one

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Subject: Re: thread::create create 2 system threads instead of one
From: oleg.n4yt@gmail.com (Олег Н.)
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 by: Олег Н. - Thu, 22 Feb 2024 09:25 UTC

> Hi Oleg,
> what is your platform? If it is linux, which threadding system was
> compiled in (pthreads) (found by the configure script).

Oops. Forgot to say. I use Linux based os.
% array get tcl_platform
osVersion 5.4.247-my pointerSize 8 byteOrder littleEndian threaded 1 machine x86_64 platform unix pathSeparator : os Linux engine Tcl user lego wordSize 8
~$ ldd `which tclsh` | grep thread
libpthread.so.0 => /lib/libpthread.so.0 (0x00007f7bad070000)

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