Which is more efficient - sleep or infinite while?

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sleep

sleep(3UCB)					     SunOS/BSD Compatibility Library Functions					       sleep(3UCB)

NAME

       sleep - suspend execution for interval

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...

       int sleep(seconds)
       unsigned seconds;

DESCRIPTION

       sleep() suspends the current process from execution for the number of seconds specified by the argument.  The actual suspension time may be
       up to 1 second less than that requested, because scheduled wakeups occur at fixed 1-second intervals, and may be an arbitrary amount longer
       because of other activity in the system.

       sleep()	is implemented by setting an interval timer and pausing until it expires.  The previous state of this timer is saved and restored.
       If the sleep time exceeds the time to the expiration of the previous value of the timer, the process sleeps only until the timer would have
       expired, and the signal which occurs with the expiration of the timer is sent one second later.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cc(1B), alarm(2), getitimer(2), longjmp(3C), siglongjmp(3C), sleep(3C), usleep(3C), attributes(5)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       SIGALRM should not be blocked or ignored during a call to sleep(). Only a prior call to alarm(2) should generate SIGALRM  for  the  calling
       process	during	a call to sleep(). A signal-catching function should not interrupt a call to sleep() to call siglongjmp(3C) or longjmp(3C)
       to restore an environment saved prior to the sleep() call.

WARNINGS

       sleep() is slightly incompatible with alarm(2). Programs that do not execute for at least one second of clock time between successive calls
       to  sleep()  indefinitely  delay  the alarm signal. Use sleep(3C). Each sleep(3C) call postpones the alarm signal that would have been sent
       during the requested sleep period to occur one second later.

SunOS 5.11							    30 Oct 2007 						       sleep(3UCB)

Shell Programming and Scripting