Are you talking about POSIX semaphores, sem_wait(3) and friends, or just the general semaphor data structure? If the former, then the Chicken developers are eagerly awaiting your patches ;-) If the latter, take a look at the synch and mailbox eggs. They have mutex-like functionality that can be used in place of proper semaphores.
Ivan On May 4, 2013 7:59 AM, "Dan Leslie" <[email protected]> wrote: > I was just poking through posix, posix-shm, posix-utils, and > posix-extras and it seems that none of them implement semaphores! > > Am I missing something, or is this actually the case? > > -Dan > > On 5/3/2013 3:26 PM, Ivan Raikov wrote: > > Hello, > > I really strongly advise _against_ using SRFI-4 vectors for 4G files, as > I have experienced serious performance issues even with vectors of a few > million elements. If your C code is to be linked with your Chicken code, > you can pass the pointer to your data from C to Scheme and use SRFI-4 > foreign pointers to access it (see unit lolevel for details). If the C code > is running as a separate process, you could try using posix-shm to create > shared memory between processes and then use foreign pointers in the > Chicken process. > > Ivan > On May 4, 2013 3:04 AM, "Pedro Melendez" <[email protected]> wrote: > >> >> Hi all, >> >> Sorry if this question is obvious, but I couldn't find what I were >> looking for in the documentation so maybe you guys can help me. >> >> I am developing a prototype of a server that would serve 3D seismic >> images across the network. This task requires to process big files (~4 GB) >> with existing C code that is desirable to maintain. I plan to write the >> server itself in Chicken scheme but I would need to maintain the existing >> code in C that opens and process those files. >> >> Giving the size of the file, I want to share the memory space between C >> and Chicken and avoid copying values between areas. Is that even possible? >> Anyone has an idea on how can I address this? >> >> Thanks in advance! >> >> Pedro >> >> -- >> T: +1 (416) - 357.5356 >> Skype ID: pmelendezu >> >> >> >> _______________________________________________ >> Chicken-users mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/chicken-users >> >> > > _______________________________________________ > Chicken-users mailing > [email protected]https://lists.nongnu.org/mailman/listinfo/chicken-users > > >
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