PTHREAD_ATTR_SETSTACK(3) Linux Programmer's Manual PTHREAD_ATTR_SETSTACK(3)
pthread_attr_setstack, pthread_attr_getstack - set/get stack attributes in thread
int pthread_attr_setstack(pthread_attr_t *attr,
void *stackaddr, size_t stacksize);
int pthread_attr_getstack(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)):
_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
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
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.
On success, these functions return 0; on error, they return a nonzero error number.
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.1-2001 also documents an EACCES error if the stack area described by stackaddr and
stacksize is not both readable and writable by the caller.
These functions are provided by glibc since version 2.2.
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 appli-
cation 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_setguard-
size(3) is ignored. If deemed necessary, it is the application's responsibility to allo-
cate 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 allo-
cation. 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.
mmap(2), mprotect(2), posix_memalign(3), pthread_attr_init(3),
pthread_attr_setguardsize(3), pthread_attr_setstackaddr(3), pthread_attr_setstacksize(3),
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Linux 2008-10-24 PTHREAD_ATTR_SETSTACK(3)