установить / получить атрибуты стека в объекте атрибутов потока (set/get stack attributes in thread attributes object)
Имя (Name)
pthread_attr_setstack, pthread_attr_getstack - set/get stack
attributes in thread attributes object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_attr_setstack(pthread_attr_t *attr,
void *stackaddr, size_t stacksize);
int pthread_attr_getstack(const pthread_attr_t *restrict attr,
void **restrict stackaddr,
size_t *restrict stacksize);
Compile and link with -pthread.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
pthread_attr_getstack(), pthread_attr_setstack():
_POSIX_C_SOURCE >= 200112L
Описание (Description)
The pthread_attr_setstack() function sets the stack address and
stack size attributes of the thread attributes object referred to
by attr to the values specified in stackaddr and stacksize,
respectively. These attributes specify the location and size of
the stack that should be used by a thread that is created using
the thread attributes object attr.
stackaddr should point to the lowest addressable byte of a buffer
of stacksize bytes that was allocated by the caller. The pages
of the allocated buffer should be both readable and writable.
The pthread_attr_getstack() function returns the stack address
and stack size attributes of the thread attributes object
referred to by attr in the buffers pointed to by stackaddr and
stacksize, respectively.
Возвращаемое значение (Return value)
On success, these functions return 0; on error, they return a
nonzero error number.
Ошибки (Error)
pthread_attr_setstack() can fail with the following error:
EINVAL stacksize is less than PTHREAD_STACK_MIN (16384) bytes.
On some systems, this error may also occur if stackaddr or
stackaddr + stacksize is not suitably aligned.
POSIX.1 also documents an EACCES error if the stack area
described by stackaddr and stacksize is not both readable and
writable by the caller.
Версии (Versions)
These functions are provided by glibc since version 2.2.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│pthread_attr_setstack(), │ Thread safety │ MT-Safe │
│pthread_attr_getstack() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Примечание (Note)
These functions are provided for applications that must ensure
that a thread's stack is placed in a particular location. For
most applications, this is not necessary, and the use of these
functions should be avoided. (Use pthread_attr_setstacksize(3)
if an application simply requires a stack size other than the
default.)
When an application employs pthread_attr_setstack(), it takes
over the responsibility of allocating the stack. Any guard size
value that was set using pthread_attr_setguardsize(3) is ignored.
If deemed necessary, it is the application's responsibility to
allocate a guard area (one or more pages protected against
reading and writing) to handle the possibility of stack overflow.
The address specified in stackaddr should be suitably aligned:
for full portability, align it on a page boundary
(sysconf(_SC_PAGESIZE)). posix_memalign(3) may be useful for
allocation. Probably, stacksize should also be a multiple of the
system page size.
If attr is used to create multiple threads, then the caller must
change the stack address attribute between calls to
pthread_create(3); otherwise, the threads will attempt to use the
same memory area for their stacks, and chaos will ensue.
Примеры (Examples)
See pthread_attr_init(3).
Смотри также (See also)
mmap(2), mprotect(2), posix_memalign(3), pthread_attr_init(3),
pthread_attr_setguardsize(3), pthread_attr_setstackaddr(3),
pthread_attr_setstacksize(3), pthread_create(3), pthreads(7)
