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PTHREAD_ATTR_GET_NP(3) Library Functions Manual PTHREAD_ATTR_GET_NP(3) NAME pthread_attr_get_np -- get attributes of existing thread LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_attr_get_np(pthread_t thread, pthread_attr_t *attr); int pthread_getattr_np(pthread_t thread, pthread_attr_t *attr); DESCRIPTION The pthread_attr_get_np() and pthread_getattr_np() functions can be used to retrieve attributes of a running thread. The result is stored to attr. For pthread_attr_get_np() attr should be initialized prior to the call by using pthread_attr_init(3). pthread_getattr_np() does this automatically. For both functions attr should be freed when it is not in use anymore with pthread_attr_destroy(3). Most fields of attr are the same ones provided during thread creation time as a parameter to pthread_create(3). The exceptions include: o The detach state -- a joinable thread may have detached itself after the creation. o The guard size, which may vary if the application has allocated its own thread stack. o The stack address and size; pthread_attr_get_np() will always return the thread's real stack address and size, regardless of the values in the original attributes structure. The returned pthread_attr_t structure is supposed to be used in conjunction with the pthread_attr_get*() functions to retrieve individual values from the structure. When the returned attr is no longer needed, it should be destroyed by using pthread_attr_destroy(3). RETURN VALUES Upon successful completion, pthread_attr_get_np() and pthread_getattr_np() return 0. Otherwise an error number is returned to indicate the error. COMPATIBILITY The pthread_attr_get_np() and pthread_getattr_np() functions are non- standard extensions. ERRORS The pthread_attr_get_np() and pthread_getattr_np() functions will fail if: [ENOMEM] Insufficient memory. [ESRCH] Non-existent thread. SEE ALSO pthread(3), pthread_attr(3) NetBSD 7.1.2 August 6, 2010 NetBSD 7.1.2