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pthread_attr_getstack(3c) [sunos man page]

pthread_attr_getstack(3C)												 pthread_attr_getstack(3C)

NAME
pthread_attr_getstack, pthread_attr_setstack - get or set stack attributes SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ] #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); The pthread_attr_getstack() and pthread_attr_setstack() functions, respectively, 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 stor- age is stackaddr, and the size of the storage is stacksize bytes. The stacksize argument must be at least {PTHREAD_STACK_MIN}. The stack- addr argument must be aligned appropriately to be used as a stack; for example, pthread_attr_setstack() might fail with EINVAL if (stack- addr & 0x7) is not 0. All pages within the stack described by stackaddr and stacksize are both readable and writable by the thread. Upon successful completion, these functions return a 0; otherwise, an error number is returned to indicate the error. The pthread_attr_getstack() function stores the stack attribute values in stackaddr and stacksize if successful. The pthread_attr_setstack() function will fail if: EINVAL The value of stacksize is less than {PTHREAD_STACK_MIN}. The pthread_attr_setstack() function may fail if: EACCES The stack page(s) described by stackaddr and stacksize are not both readable and writable by the thread. EINVAL The value of stackaddr does not have proper alignment to be used as a stack, or (stackaddr + stacksize) lacks proper align- ment. 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. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ pthread_attr_init(3C), pthread_attr_setdetachstate(3C), pthread_attr_setstacksize(3C), pthread_create(3C), attributes(5) 23 Mar 2005 pthread_attr_getstack(3C)

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PTHREAD_ATTR_GETSTACK(3P)				     POSIX Programmer's Manual					 PTHREAD_ATTR_GETSTACK(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
pthread_attr_getstack, pthread_attr_setstack - get and set stack attributes SYNOPSIS
#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
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 stor- age shall be stackaddr, and the size of the storage shall be stacksize bytes. The stacksize shall be at least {PTHREAD_STACK_MIN}. The stackaddr shall be aligned appropriately to be used as a stack; for example, pthread_attr_setstack() may fail with [EINVAL] if ( stackaddr & 0x7) is not 0. All pages within the stack described by stackaddr and stacksize shall be both readable and writable by the thread. RETURN VALUE
Upon successful completion, these functions shall return a value of 0; otherwise, an error number shall be returned to indicate the error. The pthread_attr_getstack() function shall store the stack attribute values in stackaddr and stacksize if successful. ERRORS
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 if ( 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
None. APPLICATION USAGE
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, "over- flow" might mean that two separate stack pointers allocated within the region will overlap somewhere in the middle of the region. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
pthread_attr_init(), pthread_attr_setdetachstate(), pthread_attr_setstacksize(), pthread_create(), the Base Definitions volume of IEEE Std 1003.1-2001, <limits.h>, <pthread.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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 http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 PTHREAD_ATTR_GETSTACK(3P)
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