PTHREAD_ATTR_SETSTACK(3)   Linux Programmer's Manual  PTHREAD_ATTR_SETSTACK(3)



NAME
       pthread_attr_setstack, pthread_attr_getstack - set/get stack attributes
       in thread attributes object

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 *attr,
				 void **stackaddr, size_t *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

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, respec-
       tively.

RETURN VALUE
       On success, these functions return 0; on error, they return  a  nonzero
       error number.

ERRORS
       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	stack-
	      addr + 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	 call-
       er.

VERSIONS
       These functions are provided by glibc since version 2.2.

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()	 |		 |	   |
       +-------------------------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       These  functions	 are provided for applications that must ensure that a
       thread's stack is placed in a particular location.  For	most  applica-
       tions,  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 neces-
       sary, 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);	other-
       wise,  the  threads  will attempt to use the same memory area for their
       stacks, and chaos will ensue.

EXAMPLE
       See pthread_attr_init(3).

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)

COLOPHON
       This page is part of release 4.10 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.



Linux				  2016-03-15	      PTHREAD_ATTR_SETSTACK(3)