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30 .Dd September 11, 2000
35 .Nd "create a per-process timer (REALTIME)"
42 .Fa "clockid_t clockid" "struct sigevent *restrict evp"
43 .Fa "timer_t *restrict timerid"
48 system call creates a per-process timer using the specified clock,
53 system call returns, in the location referenced by
57 used to identify the timer in timer requests.
58 This timer ID is unique within the calling process until the timer is deleted.
63 The timer whose ID is returned is in a disarmed state upon return from
74 allocated by the application, defines the asynchronous notification to occur
75 when the timer expires.
80 the effect is as if the
86 member having the value
90 having a default signal number, and the
93 the value of the timer ID.
95 The implementations supports a
100 .Dv CLOCK_MONOTONIC .
103 .Fa evp->sigev_sigev_notify
107 .Fa sev->sigev_notify_attributes
110 if the attribute pointed to by
111 .Fa sev->sigev_notify_attributes
113 a thread stack address specified by a call to
114 .Fn pthread_attr_setstack
116 .Fn pthread_attr_setstackaddr ,
117 the results are unspecified if the signal is generated more than once.
119 If the call succeeds,
121 returns zero and updates the location referenced by
125 which can be passed to the per-process timer calls.
127 occurs, the system call returns a value of \-1
128 and the global variable
130 is set to indicate the
134 is undefined if an error occurs.
142 The calling process has already created all of the timers it is allowed by
145 The specified clock ID is not supported.
147 Any arguments point outside the allocated address space or there is a
148 memory protection fault.
153 .Xr timer_getoverun 2 ,
158 system call conforms to
163 per-process timer first appeared in