Custodians can have entries that are cleaned up on program exit and
entries that are only cleaned up whenever a custodian is (regularly) shut
down.
See http://docs.racket-lang.org/inside/Custodians.html
scheme_add_managed vs. scheme_add_managed_close_on_exit
As far as i can tell the subprocess is added with scheme_add_managed.
Patching this to *_close_on_exit changes the behavior to what the OP
expect. I'm not sure if close on exit or not is the better default for
subprocesses, better ask Matthew what his intentions were.
Tobias
The patch:
diff --git a/racket/src/racket/src/port.c b/racket/src/racket/src/port.c
index f2a1811..cc99888 100644
--- a/racket/src/racket/src/port.c
+++ b/racket/src/racket/src/port.c
@@ -10090,7 +10090,7 @@ static Scheme_Object *subprocess(int c,
Scheme_Object *args[])
else
closer = interrupt_subproc;
- mref = scheme_add_managed(NULL, (Scheme_Object *)subproc, closer,
NULL, 1);
+ mref = scheme_add_managed_close_on_exit(NULL, (Scheme_Object
*)subproc, closer, NULL);
subproc->mref = mref;
}
On Wed, 30 Oct 2013 14:48:25 +0100, Asumu Takikawa <as...@ccs.neu.edu>
wrote:
On 2013-10-28 18:39:23 -0400, Jonathan Schuster wrote:
My assumption was that the root custodian would always call
custodian-shutdown-all on itself when a Racket process ends,
regardless of
whether the process is shutting down gracefully or not. Is that not
the
case?
I suspect the issue here is the caveat described in the docs for
`current-subprocess-custodian-mode`:
Custodian-triggered shutdown is limited by details of process handling
in the host system. For example, process and system may create an
intermediate shell process to run a program, in which case
custodian-based termination shuts down the shell process and probably
not the process started by the shell. See also subprocess-kill. Process
groups (see subprocess-group-enabled) can address some limitations, but
not all of them.
My guess is that running "racket" from a subprocess spawns additional
processes that aren't controlled from the custodian. I noticed that if
you change the program from "racket" to running "bin/cat", for example,
the subprocess does seem to be terminated.
(I don't actually know much about custodians so this could be all wrong)
Cheers,
Asumu
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Tobias Hammer
DLR / Robotics and Mechatronics Center (RMC)
Muenchner Str. 20, D-82234 Wessling
Tel.: 08153/28-1487
Mail: tobias.ham...@dlr.de
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