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Reflect -current implementations

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This commit is contained in:
Andrey A. Chernov 1997-08-12 17:53:00 +00:00
parent 28dce04d19
commit bc044b88dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=28116
2 changed files with 25 additions and 21 deletions
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13
lib/libc/gen/sleep.3
View file

@ -53,7 +53,9 @@ System activity or time spent in processing the
call may lengthen the sleep by a second.
.Pp
If a timer is already running on the process its state is unaltered by
this sleep implementation.
this
.Fn sleep
implementation.
If the value
.Fa seconds
is more than or equal to the remaining clock time for the running timer,
@ -65,10 +67,10 @@ This function is implemented using
by pausing for
.Fa seconds
of time or until any signal occurse.
For compatibility reasons during
For compatibility reasons SIGALRM signal unblocked and handled
internally during
.Fn sleep
call SIGALRM handler is temporary set to the
function which does nothing but returns.
call.
.Sh RETURN VALUES
The
.Fn sleep
@ -79,8 +81,11 @@ needed to be passed to a subsequent sleep to complete the necessary delay.
repeatedly until it returns zero may busy-wait until a timer
is available.
.Sh SEE ALSO
.Xr alarm 3 ,
.Xr setitimer 2 ,
.Xr signal 3 ,
.Xr signanosleep 2 ,
.Xr ualarm 3 ,
.Xr usleep 3
.Sh HISTORY
A

33
lib/libc/gen/usleep.3
View file

@ -52,30 +52,29 @@ of time.
System activity or time spent in processing the
call may lengthen the sleep slightly.
.Pp
If a timer is already running on the process its state is saved.
If a timer is already running on the process its state is unaltered by
this
.Fn usleep
implementation.
If the value
.Fa microseconds
is more than or equal to the remaining clock time for the saved timer,
is more than or equal to the remaining clock time for the running timer,
the sleep time is set to
the remaining clock time.
The state of the previous timer
is restored after
.Fa microseconds
has passed.
.Pp
This routine is implemented using
.Xr setitimer 2 ;
it requires eight system calls each time it is invoked.
A similar but less compatible function can be obtained with a single
.Xr select 2 ;
such a function would not restart after signals, but would not interfere
with other uses of
.Xr setitimer .
This function is implemented using
.Xr signanosleep 2
by pausing for
.Fa microseconds
of time or until SIGALRM signal occurse.
.Sh NOTES
.Pp
A microsecond is 0.000001 seconds.
.Sh SEE ALSO
.Xr getitimer 2 ,
.Xr setitimer 2 ,
.Xr sigpause 2 ,
.Xr alarm 3 ,
.Xr setitimer 2 ,
.Xr signal 3 ,
.Xr signanosleep 2 ,
.Xr sleep 3 ,
.Xr ualarm 3
.Sh HISTORY