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pthread_attr_setstacksize - Man Page

set/get stack size attribute in thread attributes object


POSIX threads library (libpthread, -lpthread)


#include <pthread.h>

int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize);
int pthread_attr_getstacksize(const pthread_attr_t *restrict attr,
                              size_t *restrict stacksize);


The pthread_attr_setstacksize() function sets the stack size attribute of the thread attributes object referred to by attr to the value specified in stacksize.

The stack size attribute determines the minimum size (in bytes) that will be allocated for threads created using the thread attributes object attr.

The pthread_attr_getstacksize() function returns the stack size attribute of the thread attributes object referred to by attr in the buffer pointed to by stacksize.

Return Value

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


pthread_attr_setstacksize() can fail with the following error:


The stack size is less than PTHREAD_STACK_MIN (16384) bytes.

On some systems, pthread_attr_setstacksize() can fail with the error EINVAL if stacksize is not a multiple of the system page size.


For an explanation of the terms used in this section, see attributes(7).

pthread_attr_setstacksize(), pthread_attr_getstacksize()Thread safetyMT-Safe


These functions are provided since glibc 2.1.


POSIX.1-2001, POSIX.1-2008.


For details on the default stack size of new threads, see pthread_create(3).

A thread's stack size is fixed at the time of thread creation. Only the main thread can dynamically grow its stack.

The pthread_attr_setstack(3) function allows an application to set both the size and location of a caller-allocated stack that is to be used by a thread.


As at glibc 2.8, if the specified stacksize is not a multiple of STACK_ALIGN (16 bytes on most architectures), it may be rounded downward, in violation of POSIX.1, which says that the allocated stack will be at least stacksize bytes.


See pthread_create(3).

See Also

getrlimit(2), pthread_attr_init(3), pthread_attr_setguardsize(3), pthread_attr_setstack(3), pthread_create(3), pthreads(7)

Referenced By

procenv(1), pthread_attr_init(3), pthread_attr_setguardsize(3), pthread_attr_setstack(3), pthread_attr_setstackaddr(3), pthread_create(3), pthread_getattr_default_np(3), pthread_getattr_np(3).

The man page pthread_attr_getstacksize(3) is an alias of pthread_attr_setstacksize(3).

2024-05-02 Linux man-pages 6.9.1