#17650: alarm broken on cygwin
-------------------------------------+-------------------------------------
Reporter: gouezel | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: porting: Cygwin | Resolution:
Keywords: ppl, cygwin | Merged in:
Authors: Sebastien Gouezel | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/gouezel/alarm_broken_on_cygwin | 457bfa5062b248f4c36abeda94e84ed7c0acb877
Dependencies: | Stopgaps:
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Comment (by gouezel):
Replying to [comment:14 jpflori]:
> @sebastien: can you provide a minimal C file reproducing the issue?
> Maybe something inspired in the aforementioned 2008 post can help.
I just tried, but unfortunately I was not able to reproduce the issue with
plain C or C++ files (for instance, taking the file in the link you give
and adding ppl headers and initialization does not break the itimer
mechanism).
For the record, steps to reproduce the issue using python:
File `alarm.pyx`:
{{{
import signal
def essai(n):
signal.setitimer(signal.ITIMER_REAL, 0.5 , 0)
return sum(xrange(n))
}}}
File `alarme_c.cpp`
{{{
#include <ppl.hh>
}}}
File `setup.py`
{{{
from distutils.core import setup
from Cython.Build import cythonize
from distutils.extension import Extension
setup(
ext_modules = cythonize(Extension("alarme", ['alarme.pyx',
'alarme_c.cpp'], libraries = ['ppl']))
)
}}}
File `essai.py`
{{{
import alarme
print alarme.essai(100000000)
}}}
Compile the extension with
{{{
python setup.py build_ext --inplace
}}}
Then `python essai.py` results in `4999999950000000`, no interruption.
Commenting out the header inclusion in `alarme_c.cpp`, then one gets
`Alarm clock` instead.
--
Ticket URL: <http://trac.sagemath.org/ticket/17650#comment:16>
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