How to "hibernate" a process? Post: 302498756

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Top Forums UNIX for Dummies Questions & Answers How to "hibernate" a process? Post 302498756 by Corona688 on Tuesday 22nd of February 2011 11:13:08 AM

02-22-2011

Registered User

There's lots of ways to do this in UNIX.

The simplest way to fix your loop is to add a usleep(100000); at the bottom of your while(1) loop: This will put the process to sleep for at least 100 milliseconds per loop, preventing it from checking for the file more than 10 times per second. The process literally goes to sleep, consuming no CPU time until the delay is up. This may also mean a lag of up to a tenth of a second between a new file being created and the new file being used.

Other, more direct methods, may depend on what your system actually is.

One concern: Is this actually a flag file, i.e. this file is created only after all the data is finished? Or is it one of the data files, which you might catch in the middle of being written to instead of after it's done?

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LEARN ABOUT FREEBSD

usleep

USLEEP(3)						   BSD Library Functions Manual 						 USLEEP(3)

NAME

     usleep -- suspend process execution for an interval measured in microseconds

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     usleep(useconds_t microseconds);

DESCRIPTION

     The usleep() function suspends execution of the calling process until either microseconds microseconds have elapsed or a signal is delivered
     to the process and its action is to invoke a signal-catching function or to terminate the process.  System activity may lengthen the sleep by
     an indeterminate amount.

     This function is implemented using nanosleep(2) by pausing for microseconds microseconds or until a signal occurs.  Consequently, in this
     implementation, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM.

RETURN VALUES

     The usleep() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The usleep() function will fail if:

     [EINTR]		A signal was delivered to the process and its action was to invoke a signal-catching function.

SEE ALSO

     nanosleep(2), sleep(3)

HISTORY

     The usleep() function appeared in 4.3BSD.

BSD
								 February 13, 1998							       BSD