"David T. Lewis" wrote:

On Thu, Jun 29, 2000 at 10:15:28PM +0200, Bert Freudenberg wrote:

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On Thu, 29 Jun 2000, Tim Rowledge wrote:

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nanosleep(&sleepTime, &reminderTime);

Excellent - do you know if it actually portable to most unices, or is it likely to be a hit and miss affair?

It's a POSIX standard function. I checked (the manpages) on Irix and SunOS. For Suns, it seems you have to link with libposix4 though ...

-- Bert

It will be somewhat hit and miss. For example, BDSI does not seem to have it.

    bash-2.02$ uname
    BSD/OS
    bash-2.02$ man nanosleep
    man: no entry for nanosleep in the manual.

Raivis Bucis wrote:

: On Fri, 30 Jun 2000, David T. Lewis wrote: : : Maybe in BSD there is some other short sleep than usleep?

Yes. Look at select or poll (without any descriptor).

Raivis

Hmm, select() seems to be the gcd of all platforms. Probably we should use this instead of nanosleep().

But what is the better variant: To force to initialize the Socket module, which leads to indirectly calling select(), or to call it directly in ioRelinquishProcessorForMicroseconds(int microSeconds)?

I prefer the latter, because the Socket module could be nonexistent.

But we have to handle the case where microSeconds are 0, because select() could block then (this is errorneous in my previous nanosecond() proposal, too).

Other opinions?

Greetings,

Stephan

From the man page:

SELECT(2) Linux Programmer's Manual SELECT(2)

NAME select, FD_CLR, FD_ISSET, FD_SET, FD_ZERO - synchronous I/O multiplexing

SYNOPSIS #include <sys/time.h> #include <sys/types.h> #include <unistd.h>

int select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);

FD_CLR(int fd, fd_set *set); FD_ISSET(int fd, fd_set *set); FD_SET(int fd, fd_set *set); FD_ZERO(fd_set *set);

DESCRIPTION select waits for a number of file descriptors to change status. ...

NOTES Some code calls select with all three sets empty, n zero, and a non-null timeout as a fairly portable way to sleep with subsecond precision. ...