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35 .Nd high resolution sleep
42 .Fa "clockid_t clock_id"
44 .Fa "const struct timespec *rqtp"
45 .Fa "struct timespec *rmtp"
49 .Fa "const struct timespec *rqtp"
50 .Fa "struct timespec *rmtp"
55 flag is not set in the
59 suspends execution of the calling thread until either the
60 time interval specified by the
63 or a signal is delivered to the calling process and its
64 action is to invoke a signal-catching function or to terminate the
66 The clock used to measure the time is specified by the
76 suspends execution of the calling thread until either the value
77 of the clock specified by the
79 argument reaches the absolute time specified by the
82 or a signal is delivered to the calling process and its
83 action is to invoke a signal-catching function or to terminate the
85 If, at the time of the call, the time value specified by
87 is less than or equal to the time value of the specified clock, then
89 returns immediately and the calling thread is not suspended.
91 The suspension time may be longer than requested due to the
92 scheduling of other activity by the system.
93 It is also subject to the allowed time interval deviation
95 .Va kern.timecounter.alloweddeviation
98 An unmasked signal will terminate the sleep early, regardless of the
100 value on the interrupting signal.
105 arguments can point to the same object.
109 values are supported:
111 .Bl -item -compact -offset indent
117 CLOCK_MONOTONIC_PRECISE
123 CLOCK_REALTIME_PRECISE
136 function behaves like
148 These functions return zero when the requested time has elapsed.
150 If these functions return for any other reason, then
152 will directly return the error number, and
154 will return \-1 with the global variable
156 set to indicate the error.
157 If a relative sleep is interrupted by a signal and
161 the timespec structure it references is updated to contain the
162 unslept amount (the request time minus the time actually slept).
164 These functions can fail with the following errors.
171 points to memory that is not a valid part of the process
174 The function was interrupted by the delivery of a signal.
178 argument specified a nanosecond value less than zero
179 or greater than or equal to 1000 million.
183 argument contained an invalid flag.
188 .Dv CLOCK_THREAD_CPUTIME_ID
189 or an unrecognized value.
193 argument was valid but not supported by this implementation of
194 .Fn clock_nanosleep .
197 .Xr clock_gettime 2 ,
201 These functions conform to
204 The predecessor of this system call,
214 system call has been available since