pthread_attr_getscope Subroutine Purpose Returns the value of the contention-scope attribute of a thread attributes object. Library Threads Library (libpthreads.a) Syntax #include
int pthread_attr_getscope (attr, scope) const pthread_attr_t *attr; int *scope; Description The pthread_attr_getscope subroutine returns the value of the contention-scope attribute of the thread attributes object attr. This attribute specifies the contention scope of a thread created with this attributes object. It may have one of the following values: PTHREAD_SCOPE_PROCESS Specifes process (local) contention scope; the thread will be scheduled against other local contention scope threads in the same process. PTHREAD_SCOPE_SYSTEM Specifies system (global) contention scope; the thread will be scheduled against all other threads. This is the default value. Note: The pthread.h header file must be the first included file of each source file using the threads library. Parameters attr Specifies the thread attributes object. scope Points to where the contention-scope attribute value will be stored. Return Values Upon successful completion, the value of the contention-scope attribute is returned via the scope parameter, and 0 is returned. Otherwise, an error code is returned. Error Codes The pthread_attr_getscope subroutine is unsuccessful if the following is true: EINVAL The attr parameter is not valid. ENOSYS The priority scheduling POSIX option is not implemented. Implementation Specifics This subroutine is part of the Base Operating System (BOS) Runtime. The implementation of this subroutine is dependent on the priority scheduling POSIX option. The priority scheduling POSIX option is implemented in AIX, but in the current version all threads have system contention scope; therefore, the pthread_attr_getscope subroutine always returns a scope value of PTHREAD_SCOPE_SYSTEM. Related Information The pthread_attr_setscope subroutine, pthread_attr_init subroutine. Threads Scheduling. Threads Library Options and Threads Library Quick Reference.