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29 .Dt PTHREAD_ATTR_AFFINITY_NP 3
32 .Nm pthread_attr_getaffinity_np ,
33 .Nm pthread_attr_setaffinity_np
34 .Nd manage CPU affinity in thread attribute object
40 .Fn pthread_attr_getaffinity_np "const pthread_attr_t *pattr" "size_t cpusetsize" "cpuset_t *cpusetp"
42 .Fn pthread_attr_setaffinity_np "pthread_attr_t *pattr" "size_t cpusetsize" "const cpuset_t *cpusetp"
44 .Fn pthread_attr_getaffinity_np
46 .Fn pthread_attr_setaffinity_np
47 allow the manipulation of sets of CPUs available to specified thread attribute object.
51 are composed using the
54 The kernel tolerates large sets as long as all CPUs specified
56 Sets smaller than the kernel uses generate an error on calls to
57 .Fn pthread_attr_getaffinity_np
58 even if the result set would fit within the user supplied set.
60 .Fn pthread_attr_setaffinity_np
61 tolerate small sets with no restrictions.
63 The supplied mask should have a size of
66 This size is usually provided by calling
68 which is ultimately determined by the value of
73 .Fn pthread_attr_getaffinity_np
75 mask from the thread attribute object specified by
77 and stores it in the space provided by
80 .Fn pthread_attr_setaffinity_np
81 set the mask for the thread attribute object specified by
88 .Fn pthread_attr_getaffinity_np
90 .Fn pthread_attr_setaffinity_np
91 functions will return zero.
92 Otherwise an error number will be returned
93 to indicate the error.
96 .Fn pthread_attr_getaffinity_np
98 .Fn pthread_attr_setaffinity_np
99 functions will fail if:
104 or the attribute specified by it is NULL.
108 .Fn pthread_attr_setaffinity_np
109 function will fail if:
114 or the attribute specified by it is NULL.
116 Insufficient memory exists to store the cpuset mask.
124 .Xr pthread_get_affinity_np 3 ,
125 .Xr pthread_set_affinity_np 3 .
128 .Nm pthread_attr_getaffinity_np
130 .Nm pthread_attr_setaffinity_np
131 functions are non-standard
133 extensions and may be not available on other operating systems.
136 .Nm pthread_attr_getaffinity_np
138 .Nm pthread_attr_setaffinity_np
139 functions first appeared in
144 .Nm pthread_attr_getaffinity_np
146 .Nm pthread_attr_setaffinity_np
147 functions were written by
148 .An David Xu Aq davidxu@FreeBSD.org ,
149 and this manpage was written by
150 .An Xin LI Aq delphij@FreeBSD.org .