NAME
pthread_attr_setstack,
pthread_attr_getstack —
set and get stack attributes
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);
DESCRIPTION
The functions
pthread_attr_setstack()
and
pthread_attr_getstack(),
respectively, set and get the thread creation
stackaddr and stacksize
attributes in the attr object.
The stack attributes specify the area of storage to be used for
the created thread's stack. The base (lowest addressable byte) of the
storage shall be stackaddr, and the size of the
storage shall be stacksize bytes. The stacksize shall
be at least PTHREAD_STACK_MIN.
On OpenBSD the provided stack must be page-aligned. It will be replaced (meaning zeroed) with a new MAP_ANON | MAP_STACK mapping. It is recommended that the initial mapping be allocated using an allocator which has a matching deallocator that discards whole pages, to clear the MAP_STACK attribute afterwards.
RETURN VALUES
Upon successful completion,
pthread_attr_setstack() and
pthread_attr_getstack() return a value of 0.
Otherwise, an error number is returned to indicate the error.
The pthread_attr_getstack() function
stores the stackaddr attribute value in
stackaddr and the stacksize
attribute value in stacksize if successful.
ERRORS
The pthread_attr_setstack() function will
fail if:
- [
EINVAL] - The value of stacksize is less than
PTHREAD_STACK_MINor exceeds a system-imposed limit or the value of stackaddr isNULL.
These functions will not return an error code of
[EINTR].
SEE ALSO
pthread_attr_init(3), pthread_attr_setdetachstate(3), pthread_attr_setguardsize(3), pthread_attr_setstackaddr(3), pthread_attr_setstacksize(3), pthread_create(3), pthreads(3)
STANDARDS
pthread_attr_setstack() and
pthread_attr_getstack() conform to ISO/IEC 9945-1
ANSI/IEEE (“POSIX”) Std 1003.1, 2004 Edition.