#10476: Problems interrupting Singular
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Reporter: jdemeyer | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.2
Component: interfaces | Keywords: interrupt singular expect
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by vbraun):
I find that it takes about 5 seconds, not "very long". On a closer look,
it actually takes 6 seconds = 20*0.3:
{{{
#!python
Definition: singular.interrupt(self, tries=20,
timeout=0.29999999999999999, quit_on_fail=True)
Source:
def interrupt(self, tries=20, timeout=0.3, quit_on_fail=True):
E = self._expect
if E is None:
return True
success = False
try:
for i in range(tries):
E.sendline(self._quit_string())
E.sendline(chr(3))
try:
E.expect(self._prompt, timeout=timeout)
success= True
break
except (pexpect.TIMEOUT, pexpect.EOF), msg:
#print msg
pass
except Exception, msg:
pass
if success:
pass
elif quit_on_fail:
self.quit()
return success
}}}
* The inherited method `interrupt()` actually tries to quit Singular
(`self._quit_string()=="quit"`)
* If quitting did not work the first time, is it going to work the next
19 times?
* From personal experience, I find that actually interrupting (using
ctrl-c and "continue") Singular often does not work. Restarting is very
fast, though.
I propose that the Singular pexpect interface override `interrupt()` to be
a synonym for `quit()`.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10476#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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