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Test Your Knowledge in Computers #144
Difficulty: Easy
IEEE designed POSIX around the common structure of the major competing variants of the Unix system, publishing the first POSIX standard in 1988.
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usleep(3c) [opensolaris man page]

usleep(3C)						   Standard C Library Functions 						usleep(3C)

NAME
usleep - suspend execution for interval in microseconds SYNOPSIS
#include <unistd.h> int usleep(useconds_t useconds); DESCRIPTION
The usleep() function suspends the caller from execution for the number of microseconds specified by the useconds argument. The actual sus- pension time might be less than requested because any caught signal will terminate usleep() following execution of that signal's catching routine. The suspension time might be longer than requested by an arbitrary amount because of the scheduling of other activity in the sys- tem. If the value of useconds is 0, then the call has no effect. The use of the usleep() function has no effect on the action or blockage of any signal. In a multithreaded process, only the invoking thread is suspended from execution. RETURN VALUES
On completion, usleep() returns 0. There are no error retruns. ERRORS
No errors are returned. USAGE
The usleep() function is included for its historical usage. The nanosleep(3C) function is preferred over this function. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ SEE ALSO
nanosleep(3C), sleep(3C), attributes(5), standards(5) SunOS 5.11 5 Feb 2008 usleep(3C)

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