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Aynchronous IO and Widgets
| Aynchronous IO and Widgets [message #5437] |
Tue, 19 December 1995 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
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Senior Member |
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I want to use IDL to control instruments in the lab but also want to avoid
inflicting long waiting times on my users. I've read the manual and played
with some simple widget building and recognise that IDL is not meant to be
threaded, and in particular wants each routine to finish before starting the
next one.
The problem is I want to collect data from rather slow devices which
buffer a few kB before sending it to the data-taking computer. I'm sure I
could bodge something together using a seperate program and files on disk or
ramdisk, but this would be slow and klunky on my platform and anyway I'd
prefer to have something fully integrated.
What I had in mind was to use a stub widget which would use CALL_EXTERNAL
to call an asynchronous I/O routine written in C whose completion routine
would then insert an event into the IDL event queue, telling the instrument
control base widget that the data was ready to collect. The main program
could get on with plotting and analysing earlier data until the transfer was
complete.
I am working with a PowerMac and intially want to collect data from an
IEEE488 bus, but if the method works successfully I'd like to extend it to
other data collection hardware.
Is this practical? Has anyone tried this sort of thing and got it to
work? I'll probably give it a try anyway, but would appreciate any short cuts
or ideas that people might have.
Struan
============================================================ ===============
Struan M. Gray email: struan.gray@sljus.lu.se
Dept. of Synchrotron Radiation Research Tel: + 46 46 222 3425/3478
Institute of Physics, Lund University Fax: + 46 46 222 4221
S-223 62 Lund, Sweden. http://sljusstm.sljus.lu.se/Struan/
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