bug#37480: 27.0.50; uncaught exception

bug#37480: 27.0.50; uncaught exception

[Christian Johansson]

I want to handle errors occurring in asynchronous threads like in this
example, is it possible?

(make-thread
(lambda()
(message "Start of asynchronous thread")
(signal 'error '("Fatal error"))
(message "End of asynchronous thread")))




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-- 

Hälsningar / Best Regards
Christian

bug#37480: 27.0.50; uncaught exception

[Eli Zaretskii]

> From: Christian Johansson <christian@cvj.se>
> Date: Sun, 22 Sep 2019 16:00:38 +0200
> 
> I want to handle errors occurring in asynchronous threads like in this
> example, is it possible?

For some value of "possible".  From the ELisp manual:

     When code run by a thread signals an error that is unhandled, the
  thread exits.  Other threads can access the error form which caused the
  thread to exit using the following function.

   -- Function: thread-last-error
       This function returns the last error form recorded when a thread
       exited due to an error.  Each thread that exits abnormally
       overwrites the form stored by the previous thread’s error with a
       new value, so only the last one can be accessed.

> (make-thread
> (lambda()
> (message "Start of asynchronous thread")
> (signal 'error '("Fatal error"))
> (message "End of asynchronous thread")))

I'm not sure I understand what you tried to accomplish with this code.
It doesn't seem to handle errors in any way.  Could you explain what
you are trying to do?

bug#37480: 27.0.50; uncaught exception

[Christian Johansson]

Hi!

Alright, I would like to do something like this:

(condition-case
     nil
     (make-thread
      (lambda()
        (message "Start of asynchronous thread")
        (signal 'error '("Fatal error"))
        (message "End of asynchronous thread")))
   (message "Catched error"))

I have a case were a error occurs inside a tramp thread and I would like 
to be able to handle it

Hälsningar / Best Regards
Christian

On 2019-09-22 16:50, Eli Zaretskii wrote:
>> From: Christian Johansson <christian@cvj.se>
>> Date: Sun, 22 Sep 2019 16:00:38 +0200
>>
>> I want to handle errors occurring in asynchronous threads like in this
>> example, is it possible?
> For some value of "possible".  From the ELisp manual:
>
>       When code run by a thread signals an error that is unhandled, the
>    thread exits.  Other threads can access the error form which caused the
>    thread to exit using the following function.
>
>     -- Function: thread-last-error
>         This function returns the last error form recorded when a thread
>         exited due to an error.  Each thread that exits abnormally
>         overwrites the form stored by the previous thread’s error with a
>         new value, so only the last one can be accessed.
>
>> (make-thread
>> (lambda()
>> (message "Start of asynchronous thread")
>> (signal 'error '("Fatal error"))
>> (message "End of asynchronous thread")))
> I'm not sure I understand what you tried to accomplish with this code.
> It doesn't seem to handle errors in any way.  Could you explain what
> you are trying to do?

bug#37480: 27.0.50; uncaught exception

[Eli Zaretskii]

> Cc: 37480@debbugs.gnu.org
> From: Christian Johansson <christian@cvj.se>
> Date: Sun, 22 Sep 2019 17:26:28 +0200
> 
> (condition-case
>      nil
>      (make-thread
>       (lambda()
>         (message "Start of asynchronous thread")
>         (signal 'error '("Fatal error"))
>         (message "End of asynchronous thread")))
>    (message "Catched error"))
> 
> I have a case were a error occurs inside a tramp thread and I would like 
> to be able to handle it

You don't need condition-case in this case, you just need to examine
the value of thread-last-error when the thread exits.

Alternatively, you could try making the thread you start signal the
main thread, then the main thread should be able to catch that error.

In general, errors are thread-local, so you cannot catch an error
signaled in another thread.

bug#37480: 27.0.50; uncaught exception

[Christian Johansson]

Hi

Alright, I didn't know about that function. Can you give an example of 
how to use it? It tried the following but it doesn't work, it seems the 
thread dies after the signal and I'm not sure were it exits.

(make-thread
  (lambda()
    (message "Start of asynchronous thread")
    (signal 'error '("Fatal error"))
    (message "End of asynchronous thread")
    (message "Last error %s" (thread-last-error))))

For my ssh-deploy plugin, sometimes a asynchronous process or thread 
gets an error, could be network issues for instance and I would like to 
be able to handle these cases. I'm trying to make sure there is only one 
asynchronous process or thread simultaneously related to a local file, 
this is to avoid race conditions that otherwise occur with my plugin, 
especially when on a bad connection.

I would be interested in exploring how to signal the main thread from 
the created thread, where can I read more about that?

Hälsningar / Best Regards
Christian

On 2019-09-22 17:39, Eli Zaretskii wrote:
>> Cc: 37480@debbugs.gnu.org
>> From: Christian Johansson <christian@cvj.se>
>> Date: Sun, 22 Sep 2019 17:26:28 +0200
>>
>> (condition-case
>>       nil
>>       (make-thread
>>        (lambda()
>>          (message "Start of asynchronous thread")
>>          (signal 'error '("Fatal error"))
>>          (message "End of asynchronous thread")))
>>     (message "Catched error"))
>>
>> I have a case were a error occurs inside a tramp thread and I would like
>> to be able to handle it
> You don't need condition-case in this case, you just need to examine
> the value of thread-last-error when the thread exits.
>
> Alternatively, you could try making the thread you start signal the
> main thread, then the main thread should be able to catch that error.
>
> In general, errors are thread-local, so you cannot catch an error
> signaled in another thread.

bug#37480: 27.0.50; uncaught exception

[Michael Albinus]

Christian Johansson <christian@cvj.se> writes:

> Hi

Hi Christian,

> Alright, I didn't know about that function. Can you give an example of
> how to use it?

See .../test/src/thread-tests.el, function threads-errors.

> I would be interested in exploring how to signal the main thread from
> the created thread, where can I read more about that?

thread-signal does NOT raise an error if the target thread is the main
thread. You see just the message.

See .../test/src/thread-tests.el, function threads-signal-main-thread.

If you want a signal to be propagated to the main thread, you must
organise differently. For example checking thread-last-error, when the
main thread gets control.

> Hälsningar / Best Regards
> Christian

Best regards, Michael.

bug#37480: 27.0.50; uncaught exception

[Eli Zaretskii]

> Cc: 37480@debbugs.gnu.org
> From: Christian Johansson <christian@cvj.se>
> Date: Mon, 23 Sep 2019 07:18:25 +0200
> 
> Alright, I didn't know about that function. Can you give an example of 
> how to use it? It tried the following but it doesn't work, it seems the 
> thread dies after the signal and I'm not sure were it exits.
> 
> (make-thread
>   (lambda()
>     (message "Start of asynchronous thread")
>     (signal 'error '("Fatal error"))
>     (message "End of asynchronous thread")
>     (message "Last error %s" (thread-last-error))))

This function is supposed to be used by a thread other than the one
that hit the error.

> For my ssh-deploy plugin, sometimes a asynchronous process or thread 
> gets an error, could be network issues for instance and I would like to 
> be able to handle these cases.

If you want to handle the error in the thread which gets the error,
just use condition-case or similar construct in that thread.  If you
want to handle the error in another thread, thread-last-error is for
you.

bug#37480: 27.0.50; uncaught exception

[Christian Johansson]

Ok thanks, now I understand

23 sep. 2019 kl. 18:37 skrev Eli Zaretskii <eliz@gnu.org>:

>> Cc: 37480@debbugs.gnu.org
>> From: Christian Johansson <christian@cvj.se>
>> Date: Mon, 23 Sep 2019 07:18:25 +0200
>> 
>> Alright, I didn't know about that function. Can you give an example of 
>> how to use it? It tried the following but it doesn't work, it seems the 
>> thread dies after the signal and I'm not sure were it exits.
>> 
>> (make-thread
>>  (lambda()
>>    (message "Start of asynchronous thread")
>>    (signal 'error '("Fatal error"))
>>    (message "End of asynchronous thread")
>>    (message "Last error %s" (thread-last-error))))
> 
> This function is supposed to be used by a thread other than the one
> that hit the error.
> 
>> For my ssh-deploy plugin, sometimes a asynchronous process or thread 
>> gets an error, could be network issues for instance and I would like to 
>> be able to handle these cases.
> 
> If you want to handle the error in the thread which gets the error,
> just use condition-case or similar construct in that thread.  If you
> want to handle the error in another thread, thread-last-error is for
> you.

bug#37480: 27.0.50; uncaught exception

[Michael Albinus]

Christian Johansson <christian@cvj.se> writes:

> Hi!

Hi Christian,

> I have a case were a error occurs inside a tramp thread and I would
> like to be able to handle it

Could you give more details on the error inside a tramp thread? I'm
interested in.

Furthermore, Tramp in its own repository (not Emacs master) has more
support for threads. This includes better reports about errors inside
threads.

Hmm, maybe I shall sync this with the feature/tramp-thread-safe branch ...

> Hälsningar / Best Regards
> Christian

Best regards, Michael.

bug#37480: 27.0.50; uncaught exception

[Stefan Kangas]

tags 37480 + moreinfo
close 37480
thanks

Michael Albinus <michael.albinus@gmx.de> writes:

> Christian Johansson <christian@cvj.se> writes:
>
>> Hi!
>
> Hi Christian,
>
>> I have a case were a error occurs inside a tramp thread and I would
>> like to be able to handle it
>
> Could you give more details on the error inside a tramp thread? I'm
> interested in.
>
> Furthermore, Tramp in its own repository (not Emacs master) has more
> support for threads. This includes better reports about errors inside
> threads.
>
> Hmm, maybe I shall sync this with the feature/tramp-thread-safe branch ...

More information was requested, but none was given within 6 weeks, so
I'm closing this bug.  The rest of the discussion was clarifications
on how to use threads.

If there is still an issue here, please reopen the bug report.

Best regards,
Stefan Kangas