pthread_attr_setstack(3) Library Functions Manual pthread_attr_setstack(3)
NAME
pthread_attr_setstack, pthread_attr_getstack - set/get stack attributes
in thread attributes object
LIBRARY
POSIX threads library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int pthread_attr_setstack(pthread_attr_t *attr,
void stackaddr[.stacksize],
size_t stacksize);
int pthread_attr_getstack(const pthread_attr_t *restrict attr,
void **restrict stackaddr,
size_t *restrict stacksize);
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 al-
located 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
caller.
ATTRIBUTES
For an explanation of the terms used in this section, see attrib-
utes(7).
┌───────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────────────────┼───────────────┼─────────┤
│ pthread_attr_setstack(), │ Thread safety │ MT-Safe │
│ pthread_attr_getstack() │ │ │
└───────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
POSIX.1-2008.
HISTORY
glibc 2.2. POSIX.1-2001.
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.
EXAMPLES
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)
Linux man-pages 6.7 2023-10-31 pthread_attr_setstack(3)
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