To bind a CPU to a thread

Learn gcc atomic variable#define _gnu_source#include <stdio.h> #include <stdlib.h> #include <unistd.h > #include <pthread.h> #include <sys/syscall.h> #include <linux/unistd.h> #include <errno.h > #include <sched.h> #define INC_TO 1000000//Every thread adds 1 million timesint global_int = 0;//Get current T    Hread idpid_t Gettid (void) {return syscall (__nr_gettid); return pthread_self (); Cannot work ...}    void *thread_routine (void *arg) {int i;    int proc_num = (int) (long) (ARG); cpu_set_t set;    A CPU Affinity Mask Cpu_zero (&set);    Cpu_set (Proc_num, &set);    ETS the CPU affinity mask of this thread to the value specified by Maski.    A thread ' s CPU affinity mask determines the set of CPUs on which it's eligible to run.        if (Sched_setaffinity (Gettid (), sizeof (cpu_set_t), &set)) {perror ("sched_setaffinity");    return NULL;        } for (i = 0; i < inc_to; i++) {//global_int + +; __sYnc_fetch_and_add (&global_int, 1); } return NULL;    int main () {int procs = 0;    int i;    pthread_t *threads;    Get the number of processors currently online (available).   procs = (int) sysconf (_SC_NPROCESSORS_ONLN);        Mine is + if (Procs < 0) {perror ("sysconf");    return-1;    } threads = malloc (sizeof (pthread_t) * procs);        if (threads = = NULL) {perror ("malloc threads");    return-1;    } printf ("Set up%d threads ... \ n", procs);            for (i = 0; i < procs; i++) {if (Pthread_create (&threads[i], NULL, Thread_routine, (void *) (long) i)) {            Perror ("Pthread_create");            procs = i;        Break    }} for (i = 0; i < procs; i++) {Pthread_join (threads[i], NULL);    } free (threads);    printf ("All Threads-Done.global_int is%d\n", global_int);    printf ("The expected value is%d\n", inc_to * procs); return 0;}

Reference: Http://www.alexonlinux.com/multithreaded-simple-data-type-access-and-atomic-variables

To bind a CPU to a thread