Hi all, And yet another new pthreads man page looking for reviewers. Cheers, Michael .\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk .\" <mtk.manpages@xxxxxxxxx> .\" .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of this .\" manual under the conditions for verbatim copying, provided that the .\" entire resulting derived work is distributed under the terms of a .\" permission notice identical to this one. .\" .\" Since the Linux kernel and libraries are constantly changing, this .\" manual page may be incorrect or out-of-date. The author(s) assume no .\" responsibility for errors or omissions, or for damages resulting from .\" the use of the information contained herein. The author(s) may not .\" have taken the same level of care in the production of this manual, .\" which is licensed free of charge, as they might when working .\" professionally. .\" .\" Formatted or processed versions of this manual, if unaccompanied by .\" the source, must acknowledge the copyright and authors of this work. .\" .TH PTHREAD_ATTR_SETAFFINITY_NP 3 2008-11-05 "Linux" "Linux Programmer's Manual" .SH NAME pthread_attr_setaffinity_np, pthread_attr_getaffinity_np \- set/get CPU affinity of a thread .SH SYNOPSIS .nf .B #define _GNU_SOURCE .B #include <pthread.h> .BI "int pthread_attr_setaffinity_np(pthread_attr_t " attr , .BI " size_t " cpusetsize ", const cpu_set_t *" cpuset ); .BI "int pthread_attr_getaffinity_np(pthread_attr_t " attr , .BI " size_t " cpusetsize ", cpu_set_t *" cpuset ); .sp Compile and link with \fI\-pthread\fP. .SH DESCRIPTION The .BR pthread_attr_setaffinity_np () sets the CPU affinity mask attribute of the thread attributes object referred to by .I attr to the value specified in .IR cpuset . This attribute determines the CPU affinity mask of a thread created using the thread attributes object .IR attr . The .BR pthread_attr_getaffinity_np () returns the CPU affinity mask attribute of the thread attributes object referred to by .IR attr in the buffer pointed to by .IR cpuset . The argument .I cpusetsize is the length (in bytes) of the buffer pointed to by .IR cpuset . Normally this argument would be specified as .IR sizeof(cpu_set_t) . The constant .B CPU_SETSIZE specifies a value one greater than the maximum CPU number that can be stored in a CPU set. For more details on CPU affinity masks, as well as a description of a set of macros that can be used to manipulate and inspect CPU sets, see .BR sched_setaffinity (2) for details. .SH RETURN VALUE On success, these functions return 0; on error, they return a non-zero error number. .SH ERRORS .TP .B EINVAL .I attr or .I cpuset is invalid. .TP .BR EINVAL .RB ( pthread_attr_setaffinity_np ()) .I cpuset specified a CPU that was outside the range permitted by the kernel data type .\" cpumask_t used to represent CPU sets. .\" The raw sched_getaffinity() system call returns the size (in bytes) .\" of the cpumask_t type. This range is determined by the kernel configuration option .BR CONFIG_NR_CPUS . .TP .B EINVAL .RB ( pthread_getaffinity_np ()) A CPU in the affinity mask of the thread attributes object referred to by .I attr lies outside the range specified by .IR cpusetsize . .TP .B ENOMEM .RB ( pthread_attr_setaffinity_np ()) Could not allocate memory. .SH VERSIONS These functions are provided by glibc since version 2.3.4. .SH CONFORMING TO These functions are non-standard GNU extensions; hence the suffix "_np" (non-portable) in the names. .SH NOTES In glibc 2.3.3 only, versions of these functions were provided that did not have a .I cpusetsize argument. Instead the CPU set size given to the underlying system calls was always .IR sizeof(cpu_set_t) . .SH SEE ALSO .BR sched_setaffinity (2), .BR sched_setscheduler (2), .BR pthread_attr_init (3), .BR pthread_setaffinity_np (3), .BR cpuset (7), .BR pthreads (7) -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
