- get or set contentionscope attribute
cc –mt [ flag... ] file... –lpthread [ library... ] #include <pthread.h> int pthread_attr_getscope(const pthread_attr_t *restrict attr, int *restrict contentionscope);
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
The pthread_attr_setscope() and pthread_attr_getscope() functions are used to set and get the contentionscope attribute in the attr object.
The contentionscope attribute can have the value PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, or PTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope.
The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS are defined by the header <pthread.h>.
If successful, the pthread_attr_setscope() and pthread_attr_getscope() functions return 0. Otherwise, an error number is returned to indicate the error.
The pthread_attr_setscope(), or pthread_attr_getscope(), function may fail if:
attr or contentionscope is invalid.
After these attributes have been set, a thread can be created with the specified attributes using pthread_create(). Using these routines does not affect the current running thread.
See attributes(5) for descriptions of the following attributes: