[phobos] Suggestions for std.process

[Lars Tandle Kyllingstad]

I didn't even think of that, but you're right, of course.  The parent 
gets a SIGCHLD when the child terminates.  I wonder if it's possible to 
restrict the callback so that it's safe to call it from a signal 
handler?  It would have to be nothrow, that's for sure, but that's 
probably not enough.  It is all too easy to make thread-unsafe code with 
signal handlers.  Is it possible to mark functions or delegates with 
'shared', so they only operate on shared data?

-Lars


Sean Kelly wrote:
> In *nix you can set a signal handler to be notified when a child process completes.  But the restrictions on what can be done inside a signal handler are such that maybe executing a callback from inside one isn't a good idea anyway.
> 
> On Mar 8, 2010, at 12:22 AM, Lars Tandle Kyllingstad wrote:
> 
>> I don't know any way of doing this besides spawning a separate thread that a) starts the process, b) waits for it to complete, and c) calls the callback function/delegate.
>>
>> Is this what you had in mind?
>>
>> -Lars
>>
>>
>> Sean Kelly wrote:
>>> I'm not sure if this is supported in Windows, but if so, it might be nice if I could set a callback that would be executed when the process completes.
>>> On Mar 3, 2010, at 9:44 AM, Lars Tandle Kyllingstad wrote:
>>>> Hi,
>>>>
>>>> Recently, I found myself in need of the functionality that is (or should have been) in std.process, but unfortunately I found it lacking in many respects.  Assuming that improving it currently isn't at the top of the to-do list for Phobos, I decided not to wait, and rather to write my own version.  If you want you can check it out here:
>>>>
>>>> Code:   http://github.com/kyllingstad/ltk/blob/master/ltk/process.d
>>>> Docs:   http://kyllingen.net/code/ltk/doc/process.html
>>>>
>>>> I don't know if any of it is usable for Phobos, but if it is, I'd be happy to contribute.
>>>>
>>>> I've tried to write it in the style of std.concurrency, with a function spawnProcess() that returns a Pid struct.  Currently it is for POSIX only, since I have no experience at all with the Windows API.
>>>>
>>>> -Lars
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>> -- 
>> Lars Tandle Kyllingstad
>> @: lars at kyllingen.net
>> #: 40233221
>> w: http://www.kyllingen.net
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-- 
Lars Tandle Kyllingstad
@: lars at kyllingen.net
#: 40233221
w: http://www.kyllingen.net