Linux 多进程并发设计-进程对核的亲缘设置

1设计结构

在这里插入图片描述

2 设计优点

1 充分利用多核系统的并发处理能力
2 负载均衡
3 职责明确，管理进程仅负责管理，工作进程仅负责处理业务逻辑

3 演示代码:

//main.cpp
#define _GNU_SOURCE
#include<sys/types.h>
#include<sys/wait.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include<string.h>
#include<errno.h>//函数指针
typedef void (*spawn_proc_pt) (void* data);
//工作进程
static void worker_process_cycle(void* data);
//启动n个进程
static void start_worker_processes(int n);
//进程分配
pid_t spawn_process(spawn_proc_pt proc, void* data,const char* name);
//设置进程
static void worker_process_init(intptr_t worker);
int main(int argc,char** argv) {//启动4个进程start_worker_processes(4);//进程等待wait(NULL);return 0;
}//设置进程的关系
void worker_process_init(intptr_t worker)
{//cpu亲源cpu_set_t cpu_affinity;//worker = 2;				//测试用//清除cpu掩码CPU_ZERO(&cpu_affinity);//设置cpu使用哪个核CPU_SET(worker % CPU_SETSIZE, &cpu_affinity);// 0 1 2 3     CPU_SETSIZE(cpu最大数量)//sched_setaffinityif (sched_setaffinity(0, sizeof(cpu_set_t), &cpu_affinity) == -1) {//0表示绑定自己进程的pid  fprintf(stderr, "sched_setaffinity() failed,reason:%s\n", strerror(errno));}}void start_worker_processes(int n)
{int i;for (i = n - 1; i >= 0; i--){const char *processName= "worker process";spawn_process(worker_process_cycle, (void*)(intptr_t)i, processName);}
}
//分配的进程任务
pid_t spawn_process(spawn_proc_pt proc, void* data, const char* name)
{pid_t pid;pid = fork();switch (pid){case -1://创建进程失败fprintf(stderr, "Create childen  process %s failed!, reason:%s .\n", name, strerror(errno));break;case 0://创键子进程proc(data);break;default://父进程break;}printf("start %s %d", name, (long int)pid);return pid;
}
//工作函数void worker_process_cycle(void* data) {intptr_t worker = (intptr_t)data;//初始化进程worker_process_init(worker);//开始工作while(1) {sleep(10);printf("pid %ld ,doing ...\n", (long int)getpid());}
}