#14625: lrcalc calls exit()
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Reporter: thansen | Owner: jdemeyer
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: packages: standard | Resolution:
Keywords: spkg, library, lrcalc | Merged in:
Authors: | Reviewers:
Report Upstream: Reported upstream. Developers | Work issues:
acknowledge bug. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by zabrocki):
Another message that Anne forwarded to me relevant to this ticket:
Hi Anne,
I did know about that one, and I already did some work on this so that
the latest version of lrcalc does not call exit (I think). But this
doesn't really make a difference, at least not under linux.
Lrcalc calls exit() whenever a call to malloc() returns a zero pointer
(which means out-of-memory). But I am told that under linux, malloc()
NEVER returns zero. In stead, if the kernel cannot fulfill a request
for more memory, it simply kills off the program that requests it. So
if that is true, it doesn't matter if lrcalc calls exit or not, the
kernel will still kill the library and the rest of sage if lrcalc ever
runs out of memory.
I made some changes to the library that makes it possible to stop in the
middle of a computation and clean up gracefully, and this could be done
if lrcalc ever uses "too much" memory. But the library would need sage
to tell it exactly how much memory it is allowed to use. I don't have
time to get involved with programming sage proper, so somebody else will
have to figure out a way to determine how much memory can safely be
consumed. If somebody can do this, then I should be able to make sure
that lrcalc will return with an error if that amount of memory is ever
reached.
Anders
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Ticket URL: <http://trac.sagemath.org/ticket/14625#comment:5>
Sage <http://www.sagemath.org>
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