How to sleep in miliseconds, usleep() problem

[D. Susman]

Hi,

Is there a platform-independent way to sleep in miliseconds? I have
used usleep but some strange behaviour has occured. I expect that
usleep(1000) and sleep(1) shall trigger 1 second interval delays. sleep
(1) does so, but usleep(1000) fails to accomplish that.

Any advice is appreciated, thanks

 

[jason.cipriani]

Hi,

Is there a platform-independent way to sleep in miliseconds? I have
used usleep but some strange behaviour has occured. I expect that
usleep(1000) and sleep(1) shall trigger 1 second interval delays. sleep
(1) does so, but usleep(1000) fails to accomplish that.

Any advice is appreciated, thanks

sleep() is not platform-independent.

usleep() is not platform-independent either. Also, it takes it's
argument in microseconds, not milliseconds. usleep(1000) sleeps for
1000 microseconds, that's 1 millisecond, not 1 second. You can't use
usleep() to sleep for 1 second -- usleep(1000000) is not valid. See
http://linux.die.net/man/3/usleep .

Neither sleep() nor usleep() are defined by C++.

There is no platform-independent way to sleep in milliseconds (or in
any unit). You might find something in boost (e.g. boost::thread::sleep
()) or some other library.

Jason

 

[Kai-Uwe Bux]

Hi,

Is there a platform-independent way to sleep in miliseconds?
No.

I have
used usleep but some strange behaviour has occured. I expect that
usleep(1000) and sleep(1) shall trigger 1 second interval delays. sleep
(1) does so, but usleep(1000) fails to accomplish that.

Try usleep(1000000); usleep() uses microseconds, not milliseconds.


Best

Kai-Uwe Bux

 

[Michael DOUBEZ]

D. Susman a écrit :

Hi,

Is there a platform-independent way to sleep in miliseconds?

No. And c++ doesn't define any stabdard way of achieving that. AFAIK
neither does C.

I have
used usleep but some strange behaviour has occured. I expect that
usleep(1000) and sleep(1) shall trigger 1 second interval delays. sleep
(1) does so, but usleep(1000) fails to accomplish that.

usleep take microseconds in parameters, not milliseconds.
try:
usleep(1000000)

Any advice is appreciated, thanks

If you really have protability issue, try using select. It will work on
POSIX systems.
Google for a way to do it; there should be some code available.