Default system call method does not work on Cygwin

[Johannes Ring]

The default system call method, that is SUBPROCESS, results in the following error on Cygwin:

OSError: [Errno 11] Resource temporarily unavailable

The two other system call methods works fine. I suggest to use OS_SYSTEM as the default system call method on Windows.

[Johan Hake]

Are there any drawbacks for using that as default for all systems? For example is that the one I am using on abel.uio.no.

[Johannes Ring]

@johanhake - I don't think so. The reason SUBPROCESS was chosen as the default was apparently that it does not use temp files (see pull request #2).

Maybe @blechta has any comments on this.

[Jan Blechta]

Yes, exactly. A communication which SUBPROCESS does using pipes is done using temp files by OS_SYSTEM. It is hardly a drawback as whole JIT-compilator apparatus uses filesystem and key aspect for scalability is that only one process touches filesystem during JIT-ing, which was addressed by #16.

Technical detail: OS_SYSTEM does something like

cmd = command + " > " + tempfile + " 2>&1"
os.system(cmd)

which I'm not sure how it is portable and whether it is at least POSIX-compliant.

[Johannes Ring]

Change default system call method from SUBPROCESS to OS_SYSTEM (fixes issue #18).

→ <<cset d899234579a9>>

[Martin Sandve Alnæs]

Removing milestone: 1.4 (automated comment)