The following issue has been SUBMITTED.
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http://austingroupbugs.net/view.php?id=1293
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Reported By: joelsherrill
Assigned To:
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Project: 1003.1(2016)/Issue7+TC2
Issue ID: 1293
Category: Base Definitions and Headers
Type: Enhancement Request
Severity: Editorial
Priority: normal
Status: New
Name: Joel Sherrill
Organization: RTEMS.org
User Reference:
Section: pthread.h and add sys/cpuset.h
Page Number: NA - addition request
Line Number: NA - addition request
Interp Status: ---
Final Accepted Text:
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Date Submitted: 2019-09-27 19:53 UTC
Last Modified: 2019-09-27 19:53 UTC
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Summary: Add methods associated with manipulating pthread
affinity on SMP systems
Description:
At least FreeBSD, Linux, and RTEMS implement a very similar set of methods
to support manipulation of pthread affinity on SMP systems. This is a
proposal to consider the addition of a set of methods supporting this
capability. The end solution should include the capabilities in existing
implementations but needs to standardize the method signatures and types.
- sys/cpuset.h defines a data structure which is a bitmap representing the
affinity set and operations on that structure. It is similar in concept to
sigset_t but beyond filling and clearing operations, there methods that are
more like boolean operations. Ref for Linux:
- pthread.h includes methods to set the affinity as part of the
pthread_attr_t that is set at creation time and dynamically. The dynamic
methods on Linux are defined as:
#include <pthread.h>
int pthread_setaffinity_np(pthread_t thread, size_t cpusetsize,
const cpu_set_t *cpuset);
int pthread_getaffinity_np(pthread_t thread, size_t cpusetsize,
cpu_set_t *cpuset);
Those that set the attribute are defined as:
#include <pthread.h>
int pthread_attr_setaffinity_np(pthread_attr_t *attr,
size_t cpusetsize, const cpu_set_t *cpuset);
int pthread_attr_getaffinity_np(const pthread_attr_t *attr,
size_t cpusetsize, cpu_set_t *cpuset);
Desired Action:
Add support for manipulation of pthread affinity.
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Issue History
Date Modified Username Field Change
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2019-09-27 19:53 joelsherrill New Issue
2019-09-27 19:53 joelsherrill Name => Joel Sherrill
2019-09-27 19:53 joelsherrill Organization => RTEMS.org
2019-09-27 19:53 joelsherrill Section => pthread.h and add
sys/cpuset.h
2019-09-27 19:53 joelsherrill Page Number => NA - addition
request
2019-09-27 19:53 joelsherrill Line Number => NA - addition
request
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