Bug 73371 - sleep(): which clock ?
Summary: sleep(): which clock ?
Status: RESOLVED CODE_FIX
Alias: None
Product: Documentation
Classification: Unclassified
Component: man-pages (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: documentation_man-pages@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-04-02 10:09 UTC by Mike Frysinger
Modified: 2016-12-13 08:34 UTC (History)
1 user (show)

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Regression: No
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Description Mike Frysinger 2014-04-02 10:09:41 UTC 
the current man page states:
       sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.

unfortunately, the NOTES section does not discuss which clock is being used.  the nanosleep man page has a good discussion on the topic, and presumably the answer is the same ?
Comment 1 Michael Kerrisk 2016-12-13 08:34:33 UTC 
I've made the following changes to the man page. 

1. Mention "real-time" seconds in the description of how long sleep() sleeps for.

2. Added the following text in NOTES:

       On  Linux,  sleep()  is  implemented  via  nanosleep(2).   See the
       nanosleep(2) man page for a discussion of the clock used.

I'm closing this bug. Please reopen if you think anything further is required.
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