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pthread_attr_get_np(3) [freebsd man page]

PTHREAD_ATTR_GET_NP(3)					   BSD Library Functions Manual 				    PTHREAD_ATTR_GET_NP(3)

NAME
pthread_attr_get_np -- get attributes of existent thread LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread_np.h> int pthread_attr_get_np(pthread_t pid, pthread_attr_t *dst); DESCRIPTION
The pthread_attr_get_np() function is used to get existent thread's attributes. Most fields of pthread_attr_t structure are exact values of attributes provided at thread creation time (as parameter to pthread_create(3) function), except for the stack address. Value returned as dst is supposed to be used in conjunction with pthread_attr_get*() functions to retrieve individual values from pthread_attr_t structure. Parameter dst should point to allocated memory area big enough to fit this structure. It is HIGHLY RECOMMENDED to use pthread_attr_init(3) function to allocate attribute storage. IMPLEMENTATION NOTES
The pthread_attr_get_np() function will always return a pointer to the thread's real stack address, regardless of its value in the original attributes structure. RETURN VALUES
If successful, pthread_attr_get_np() function returns 0. Otherwise, an error number is returned to indicate the error. EXAMPLES
size_t my_thread_stack_size(pthread_t pid) { pthread_attr_t attr; size_t size; pthread_attr_init(&attr); pthread_attr_get_np(pid, &attr); pthread_attr_getstacksize(&attr, &size); pthread_attr_destroy(&attr); return(size); } ERRORS
The pthread_attr_get_np() function will fail if: [EINVAL] Invalid value for one of given parameters. [ESRC] No thread could be found corresponding to that specified by the given thread ID. SEE ALSO
pthread_attr_destroy(3), pthread_attr_getdetachstate(3), pthread_attr_getinheritsched(3), pthread_attr_getschedparam(3), pthread_attr_getschedpolicy(3), pthread_attr_getscope(3), pthread_attr_getstack(3), pthread_attr_getstackaddr(3), pthread_attr_getstacksize(3), pthread_attr_init(3) AUTHORS
The pthread_attr_get_np() function and this manual page were written by Alexey Zelkin <phantom@FreeBSD.org>. BSD
January 31, 2003 BSD

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PTHREAD_ATTR_GET_NP(3)					   BSD 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 auto- matically. 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) BSD
August 6, 2010 BSD

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