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int pthread_attr_setscope(pthread_attr_t *attr, int scope);
int pthread_attr_getscope(pthread_attr_t *attr, int *scope);
Compile and link with -pthread.
The pthread_attr_setscope() function sets the contention scope
attribute of the thread attributes object referred to by attr to the
value specified in scope. The contention scope attribute defines the
set of threads against which a thread competes for resources such as
the CPU. POSIX.1-2001 specifies two possible values for scope:
The thread competes for resources with all other threads in all
processes on the system that are in the same scheduling alloca-
tion domain (a group of one or more processors).
PTHREAD_SCOPE_SYSTEM threads are scheduled relative to one
another according to their scheduling policy and priority.
The thread competes for resources with all other threads in the
same process that were also created with the PTHREAD_SCOPE_PRO-
CESS contention scope. PTHREAD_SCOPE_PROCESS threads are sched-
uled relative to other threads in the process according to their
scheduling policy and priority. POSIX.1-2001 leaves it unspeci-
fied how these threads contend with other threads in other pro-
cess on the system or with other threads in the same process
that were created with the PTHREAD_SCOPE_SYSTEM contention
POSIX.1-2001 requires that an implementation support at least one of
these contention scopes. Linux supports PTHREAD_SCOPE_SYSTEM, but not
On systems that support multiple contention scopes, then, in order for
the parameter setting made by pthread_attr_setscope() to have effect
when calling pthread_create(3), the caller must use pthread_attr_set-
inheritsched(3) to set the inherit-scheduler attribute of the
attributes object attr to PTHREAD_EXPLICIT_SCHED.
The pthread_attr_getscope() function returns the contention scope
attribute of the thread attributes object referred to by attr in the
buffer pointed to by scope.
On success, these functions return 0; on error, they return a nonzero
user-space thread is bound directly to a single kernel-scheduling
entity. This is the case on Linux for the obsolete LinuxThreads imple-
mentation and the modern NPTL implementation, which are both 1:1
POSIX.1-2001 specifies that the default contention scope is implementa-
pthread_attr_setschedpolicy(3), pthread_create(3), pthreads(7)
Linux 2013-04-19 PTHREAD_ATTR_SETSCOPE(3)