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SubjectO_NONBLOCK on files
I've always wondered why it's not possible to do this:

fd = open("an_actual_file",O_RDONLY);
r = read(fd,buf,4096);

And actually have read return -1 and errno == EWOULDBLOCK/EAGAIN if the
block requested is not already cached.

Wouldn't this be the ideal interface for daemons of all types that want
to stay single-threaded and still offer useful performance when the
working set doesn't fit in cache? It works with sockets, so why not
with files?

I see even TUX has to have I/O worker threads to work around this
limitation, which seems a bit silly.


[ Stormix Technologies Inc. ][ NetNation Communications Inc. ]
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