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34 .Dt PTHREAD_ATTR_SETAFFINITY_NP 2
37 .Nm pthread_attr_setaffinity_np,
38 .Nm pthread_attr_getaffinity_np
39 .Nd set and get the thread's CPU affinity mask attribute
46 .Fn pthread_attr_setaffinity_np "pthread_attr_t *attr" "size_t cpusetsize" "const cpu_set_t *mask"
48 .Fn pthread_attr_getaffinity_np "const pthread_attr_t *attr" "size_t cpusetsize" "cpu_set_t *mask"
52 .Fn pthread_attr_setaffinity_np
53 sets the CPU affinity mask of the
55 to the value specified by the
59 is the length (in bytes) of the data pointed to by
61 Normally this argument would be specified as sizeof(cpu_set_t).
62 The threads created by
66 will use the CPU affinity mask of the
69 .Fn pthread_attr_getaffinity_np
70 writes the CPU affinity mask of the
72 to the cpu_set_t structure pointed to by
75 The cpu_set_t data structure represents a set of CPUs.
77 .Xr sched_setaffinity 2
81 these functions will return zero.
82 Otherwise an error number will be returned to indicate the error.
85 .Fn pthread_attr_setaffinity_np
87 .Fn pthread_attr_getaffinity_np
93 parameter is outside the process's allocated address space.
101 does not contain a valid CPU.
105 .Xr pthread_getaffinity_np 2
106 .Xr pthread_setaffinity_np 2
109 .Fn pthread_attr_setaffinity_np
111 .Fn pthread_attr_getaffinity_np
112 functions first appeared in