sginap - timed sleep and processor yield function
long sginap (long ticks);
The sginap system call provides two functions. With an argument of 0, it
yields the processor to any higher or equal priority threads immediately,
thus potentially allowing another thread to run. Note that because
normally the user has no direct control over the exact priority of a
given thread, this does not guarantee that another thread will run.
With an argument which is non-zero, sginap will suspend the thread for
between ticks-1 and ticks clock ticks. That is, it will suspend for at
least ticks-1 clock ticks, but less than ticks clock ticks. The length
of a clock tick is defined by CLK_TCK in the include file <limits.h>.
This is the same for all SGI systems.
Note that if the calling thread is interrupted by a signal before the
specified number of ticks has elapsed, sginap will return prematurely.
sleep(3), alarm(2), pause(2), schedctl(2), setitimer(2).
If the calling thread remains suspended for the requested number of
ticks, sginap returns 0. If, however, the thread is interrupted
prematurely by a signal, it returns the number of unexpired ticks in the
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