diff options
Diffstat (limited to 'man3/pthread_setaffinity_np.3')
| -rw-r--r-- | man3/pthread_setaffinity_np.3 | 46 |
1 files changed, 22 insertions, 24 deletions
diff --git a/man3/pthread_setaffinity_np.3 b/man3/pthread_setaffinity_np.3 index a85a56e63..112317ded 100644 --- a/man3/pthread_setaffinity_np.3 +++ b/man3/pthread_setaffinity_np.3 @@ -4,7 +4,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH pthread_setaffinity_np 3 2022-12-15 "Linux man-pages 6.03" +.TH pthread_setaffinity_np 3 2023-07-20 "Linux man-pages 6.05.01" .SH NAME pthread_setaffinity_np, pthread_getaffinity_np \- set/get CPU affinity of a thread @@ -94,29 +94,34 @@ is smaller than the size of the affinity mask used by the kernel. No thread with the ID .I thread could be found. -.SH VERSIONS -These functions are provided since glibc 2.3.4. .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). -.ad l -.nh .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ +.na +.nh .BR pthread_setaffinity_np (), .BR pthread_getaffinity_np () T} Thread safety MT-Safe .TE -.hy -.ad .sp 1 .SH STANDARDS -These functions are nonstandard GNU extensions; +GNU; hence the suffix "_np" (nonportable) in the names. +.SH HISTORY +glibc 2.3.4. +.PP +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 NOTES After a call to .BR pthread_setaffinity_np (), @@ -137,13 +142,6 @@ and .BR sched_getaffinity (2) system calls. .PP -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) . -.PP A new thread created by .BR pthread_create (3) inherits a copy of its creator's CPU affinity mask. @@ -164,37 +162,37 @@ to check the resulting CPU affinity mask of the thread. #include <pthread.h> #include <stdio.h> #include <stdlib.h> - +\& int main(void) { int s; cpu_set_t cpuset; pthread_t thread; - +\& thread = pthread_self(); - +\& /* Set affinity mask to include CPUs 0 to 7. */ - +\& CPU_ZERO(&cpuset); for (size_t j = 0; j < 8; j++) CPU_SET(j, &cpuset); - +\& s = pthread_setaffinity_np(thread, sizeof(cpuset), &cpuset); if (s != 0) errc(EXIT_FAILURE, s, "pthread_setaffinity_np"); - +\& /* Check the actual affinity mask assigned to the thread. */ - +\& s = pthread_getaffinity_np(thread, sizeof(cpuset), &cpuset); if (s != 0) errc(EXIT_FAILURE, s, "pthread_getaffinity_np"); - +\& printf("Set returned by pthread_getaffinity_np() contained:\en"); for (size_t j = 0; j < CPU_SETSIZE; j++) if (CPU_ISSET(j, &cpuset)) printf(" CPU %zu\en", j); - +\& exit(EXIT_SUCCESS); } .EE |