Section (3) pthread_attr_setaffinity_np
pthread_attr_setaffinity_np, pthread_attr_getaffinity_np — set/get CPU affinity attribute in thread attributes object
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <pthread.h>
|const cpu_set_t *cpuset
||const pthread_attr_t *attr,|
Compile and link with
pthread_attr_setaffinity_np() function sets
the CPU affinity mask attribute of the thread attributes
object referred to by
attr to the value specified in
attribute determines the CPU affinity mask of a thread
created using the thread attributes object
returns the CPU affinity mask attribute of the thread
attributes object referred to by
attr in the buffer pointed to
cpusetsize is the length (in
bytes) of the buffer pointed to by
cpuset. Typically, this
argument would be specified as
cpusetspecified a CPU that was outside the set supported by the kernel. (The kernel configuration option
CONFIG_NR_CPUSdefines the range of the set supported by the kernel data type used to represent CPU sets.)
pthread_attr_getaffinity_np()) A CPU in the affinity mask of the thread attributes object referred to by
attrlies outside the range specified by
cpusetsizeis too small).
pthread_attr_setaffinity_np()) Could not allocate memory.
For an explanation of the terms used in this section, see attributes(7).
These functions are nonstandard GNU extensions; hence the suffix _np (nonportable) in the names.
In glibc 2.3.3 only, versions of these functions were
provided that did not have a
cpusetsize argument. Instead
the CPU set size given to the underlying system calls was
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