【记录一个问题】android ndk下设置线程的亲缘性，总有两个核无法设置成功

参考了这篇文章：https://blog.csdn.net/lanyzh0909/article/details/50404664

大体的代码如下：

#include <pthread.h>

#include <sched.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/sysinfo.h>

#include <sys/types.h>

#include <unistd.h>

void* _thread_func(void* param){

    int thread_index = *(int*)param;

    int cpu_count = sysconf(_SC_NPROCESSORS_CONF);

    cpu_set_t mask;                // CPU核的集合

    cpu_set_t get;                 //获取在集合中的CPU

    CPU_ZERO(&mask);               //置空

    CPU_SET(thread_index, &mask);  //设置亲和力值

    //设置线程CPU亲和力

    if (sched_setaffinity(0, sizeof(mask), &mask) == -1) {

      printf("warning: could not set CPU %d affinity, continuing...\n", thread_index);

    } else {

      printf("thread %d set to cpu %d\n", thread_index, thread_index);

    }

}

在高通骁龙835处理器上，始终打印如下内容：

warning: could not set CPU 7 affinity, continuing...

thread 1 set to cpu 1

thread 0 set to cpu 0

thread 3 set to cpu 3

thread 2 set to cpu 2

warning: could not set CPU 4 affinity, continuing...

thread 5 set to cpu 5

thread 6 set to cpu 6

猜测是系统故意让其中的两个核无法被设置亲缘性，原因未知。

巴特西

【记录一个问题】android ndk下设置线程的亲缘性，总有两个核无法设置成功

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