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Top Forums Programming fwrite takes extremely long time Post 77163 by jim mcnamara on Tuesday 5th of July 2005 09:58:02 AM
Old 07-05-2005
You may want to consider POSIX aio - asynchronous I/O. Try man aio. e.g., aio_write, aio_read

aio allows you to request an i/o operation, then do soemthing else in your code. When you are done with the 'something else' you go back and query the completion status. You are trying to do real time processing.

You really should consider a design change. Create two processes - one to get/read the data, then send it to shared memory, and a second process which just does file writing using the shared memory data.
 

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explain_fwrite_or_die(3)				     Library Functions Manual					  explain_fwrite_or_die(3)

NAME
explain_fwrite_or_die - binary stream output and report errors SYNOPSIS
#include <libexplain/fwrite.h> size_t explain_fwrite_or_die(const void *ptr, size_t size, size_t nmemb, FILE *fp); DESCRIPTION
The explain_fwrite_or_die function is used to call the fwrite(3) system call. On failure an explanation will be printed to stderr, obtained from explain_fwrite(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: size_t result = explain_fwrite_or_die(ptr, size, nmemb, fp); ptr The ptr, exactly as to be passed to the fwrite(3) system call. size The size, exactly as to be passed to the fwrite(3) system call. nmemb The nmemb, exactly as to be passed to the fwrite(3) system call. fp The fp, exactly as to be passed to the fwrite(3) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
fwrite(3) binary stream output explain_fwrite(3) explain fwrite(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_fwrite_or_die(3)
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