Like Sean, I don't think going with SIGCHILD is a good idea. It's not
only about thread safety, but mostly about reentrancy of system functions.
Andrei
Lars Tandle Kyllingstad wrote:
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
@: [email protected]
#: 40233221
w: http://www.kyllingen.net
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