@node usleep @section @code{usleep} @findex usleep POSIX specification: @url{http://www.opengroup.org/susv3xsh/usleep.html} Gnulib module: 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: mingw. @item This function is missing on some platforms. However, the replacement is designed to be lightweight, and may round to the nearest second; use @code{select} or @code{nanosleep} if better resolution is needed: IRIX 5.3, Solaris 2.4, older mingw, MSVC 9, BeOS. @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. @end itemize