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PTHREAD_ATTR(3) Library Functions Manual PTHREAD_ATTR(3) NAME pthread_attr_init, pthread_attr_destroy -- thread attribute operations LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_attr_init(pthread_attr_t *attr); int pthread_attr_destroy(pthread_attr_t *attr); DESCRIPTION Thread attributes are used to specify parameters to pthread_create(). One attribute object can be used in multiple calls to pthread_create(), with or without modifications between the calls. The pthread_attr_t type is an opaque representation of the thread attributes; any access to the object other than via the described pthread_attr_*() functions may result in undefined behavior. The pthread_attr_init() function initializes attr with the default thread attributes used in the implementation. Depending on the implementation, undefined behavior may follow if an uninitialized thread attribute object is used with some of the thread attribute functions. It is therefore a good practice to always use pthread_attr_init(), even if this might be unnecessary. Undefined behavior may also follow if an already initialized attr is used with pthread_attr_init(). When the attribute object is no longer needed, it should be destroyed by using pthread_attr_destroy(). The function has no effect on threads that were created by using a given attribute object. A destroyed attr can be reinitialized using pthread_attr_init(), but all other actions with the destroyed object are unspecified. The following standard thread attribute functions are available: Function Description pthread_attr_getdetachstate(3) thread detach state pthread_attr_getguardsize(3) thread guard size pthread_attr_getinheritsched(3) inherit scheduler attribute pthread_attr_getschedparam(3) thread scheduling parameter pthread_attr_getschedpolicy(3) thread scheduling policy pthread_attr_getscope(3) thread contention scope pthread_attr_getstack(3) thread stack pthread_attr_getstacksize(3) thread stack size pthread_attr_getstackaddr(3) thread stack address Each listed pthread_attr_get*() function has a pthread_attr_set*() counterpart. In addition, the following NetBSD specific extensions are available: Function Description pthread_attr_get_np(3) attributes of a running thread pthread_attr_getname_np(3) descriptive name of an attribute RETURN VALUES If successful, these functions return 0. Otherwise, an error number is returned to indicate the error. ERRORS No errors are defined for pthread_attr_init() and pthread_attr_destroy(). SEE ALSO pthread_create(3), pthread_join(3) STANDARDS Both pthread_attr_init() and pthread_attr_destroy() conform to IEEE Std 1003.1-2001 (``POSIX.1''). NetBSD 7.1.2 July 9, 2010 NetBSD 7.1.2