usleep
======

POSIX specification: http://www.opengroup.org/susv3xsh/usleep.html

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This function is missing on some platforms: IRIX 5.3, Solaris 2.4, mingw, BeOS.

  * According to POSIX, the usleep function may interfere with the program's use of the SIGALRM signal.  On Linux, it doesn't; on other platforms, it may.