@node usleep
@section @code{usleep}
@findex usleep

Removed in POSIX.1-2008.
POSIX.1-2004 specification:@* @url{https://pubs.opengroup.org/onlinepubs/009695399/functions/usleep.html}

Gnulib module: usleep
@mindex usleep

Portability problems fixed by Gnulib:
@itemize
@item
On some systems, @code{usleep} rejects attempts to sleep longer than 1
second, as allowed by POSIX:
NetBSD 10.0, mingw.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
According to POSIX, the @code{usleep} function may interfere with the program's
use of the @code{SIGALRM} signal.  On Linux, it doesn't; on other platforms,
it may.
@item
On some systems, @code{usleep} may sleep for less than the indicated duration:
Cygwin 3.5.3.
@end itemize
