"PTHREAD_ATTR_GETSTACKADDR"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set +the stackaddr attribute +

Synopsis

#include <pthread.h> +

int pthread_attr_getstackaddr(const pthread_attr_t *restrict +attr, void **restrict stackaddr);
int +pthread_attr_setstackaddr(pthread_attr_t *attr, void +*stackaddr); +

Description

The pthread_attr_getstackaddr and pthread_attr_setstackaddr +functions, respectively, shall get and set the thread creation +stackaddr attribute in the attr object. +

The stackaddr attribute specifies the location of storage +to be used for the created thread’s stack. The size of the storage +shall be at least {PTHREAD_STACK_MIN}. +

Pthreads-w32 defines _POSIX_THREAD_ATTR_STACKADDR in +pthread.h as -1 to indicate that these routines are implemented but +cannot used to set or get the stack address. These routines always +return the error ENOSYS when called.

Return Value

Upon successful completion, pthread_attr_getstackaddr and +pthread_attr_setstackaddr shall return a value of 0; +otherwise, an error number shall be returned to indicate the error. +

The pthread_attr_getstackaddr function stores the stackaddr +attribute value in stackaddr if successful. +

Errors

The pthread_attr_setstackaddr function always returns the +following error code: +

ENOSYS: + The function is not supported. +

+ +

+The pthread_attr_getstackaddr function always returns the +following error code: +

ENOSYS: + The function is not supported. +

+ +

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

The following sections are informative. +

Examples

None. +

Application Usage

The specification of the stackaddr attribute presents +several ambiguities that make portable use of these interfaces +impossible. The description of the single address parameter as a +"stack" does not specify a particular relationship between +the address and the "stack" implied by that address. For +example, the address may be taken as the low memory address of a +buffer intended for use as a stack, or it may be taken as the address +to be used as the initial stack pointer register value for the new +thread. These two are not the same except for a machine on which the +stack grows "up" from low memory to high, and on which a +"push" operation first stores the value in memory and then +increments the stack pointer register. Further, on a machine where +the stack grows "down" from high memory to low, +interpretation of the address as the "low memory" address +requires a determination of the intended size of the stack. +IEEE Std 1003.1-2001 has introduced the new interfaces +pthread_attr_setstack(3) +and pthread_attr_getstack(3) +to resolve these ambiguities. +

Rationale

None. +

Future Directions

None. +

Copyright

Portions of this text are reprinted and reproduced in electronic +form from IEEE Std 1003.1, 2003 Edition, Standard for Information +Technology -- 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 +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
+
Synopsis +
+
Description +
+
Return + Value +
+
Errors +
+
Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
See + Also +
+
Copyright +
+

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