pthread_attr_getstack(3p) — Linux manual page



PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       pthread_attr_getstack, pthread_attr_setstack β€” get and set stack

SYNOPSIS         top

       #include <pthread.h>

       int pthread_attr_getstack(const pthread_attr_t *restrict attr,
           void **restrict stackaddr, size_t *restrict stacksize);
       int pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr,
           size_t stacksize);

DESCRIPTION         top

       The pthread_attr_getstack() and pthread_attr_setstack() functions,
       respectively, shall get and set the thread creation stack attributes
       stackaddr and stacksize 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}.
       The pthread_attr_setstack() function may fail with [EINVAL] if
       stackaddr does not meet implementation-defined alignment
       requirements.  All pages within the stack described by stackaddr and
       stacksize shall be both readable and writable by the thread.

       If the pthread_attr_getstack() function is called before the
       stackaddr attribute has been set, the behavior is unspecified.

       The behavior is undefined if the value specified by the attr argument
       to pthread_attr_getstack() or pthread_attr_setstack() does not refer
       to an initialized thread attributes object.

RETURN VALUE         top

       Upon successful completion, these functions shall return a value of
       0; otherwise, an error number shall be returned to indicate the

       The pthread_attr_getstack() function shall store the stack attribute
       values in stackaddr and stacksize if successful.

ERRORS         top

       The pthread_attr_setstack() function shall fail if:

       EINVAL The value of stacksize is less than {PTHREAD_STACK_MIN} or
              exceeds an implementation-defined limit.

       The pthread_attr_setstack() function may fail if:

       EINVAL The value of stackaddr does not have proper alignment to be
              used as a stack, or ((char *)stackaddr + stacksize) lacks
              proper alignment.

       EACCES The stack page(s) described by stackaddr and stacksize are not
              both readable and writable by the thread.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES         top



       These functions are appropriate for use by applications in an
       environment where the stack for a thread must be placed in some
       particular region of memory.

       While it might seem that an application could detect stack overflow
       by providing a protected page outside the specified stack region,
       this cannot be done portably. Implementations are free to place the
       thread's initial stack pointer anywhere within the specified region
       to accommodate the machine's stack pointer behavior and allocation
       requirements. Furthermore, on some architectures, such as the IA‐64,
       ``overflow'' might mean that two separate stack pointers allocated
       within the region will overlap somewhere in the middle of the region.

       After a successful call to pthread_attr_setstack(), the storage area
       specified by the stackaddr parameter is under the control of the
       implementation, as described in Section 2.9.8, Use of Application-
       Managed Thread Stacks.

       The specification of the stackaddr attribute presents several
       ambiguities that make portable use of these functions impossible. For
       example, the standard allows implementations to impose arbitrary
       alignment requirements on stackaddr.  Applications cannot assume that
       a buffer obtained from malloc() is suitably aligned. Note that
       although the stacksize value passed to pthread_attr_setstack() must
       satisfy alignment requirements, the same is not true for
       pthread_attr_setstacksize() where the implementation must increase
       the specified size if necessary to achieve the proper alignment.

RATIONALE         top

       If an implementation detects that the value specified by the attr
       argument to pthread_attr_getstack() or pthread_attr_setstack() does
       not refer to an initialized thread attributes object, it is
       recommended that the function should fail and report an [EINVAL]



SEE ALSO         top

       pthread_attr_destroy(3p), pthread_attr_getdetachstate(3p),
       pthread_attr_getstacksize(3p), pthread_create(3p)

       The   Base   Definitions   volume   of   POSIX.1‐2008,  limits.h(0p),

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) In the event of any discrepancy between this version and
       the original IEEE and The Open Group Standard, the original IEEE and
       The Open Group Standard is the referee document. The original
       Standard can be obtained online at .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see .

IEEE/The Open Group                 2013           PTHREAD_ATTR_GETSTACK(3P)

Pages that refer to this page: pthread.h(0p)pthread_attr_setstack(3p)