unix 多线程控制应用

unix 多线程控制应用

1.线程三个属性的学习

绑定

分离

优先级

thread.c

#include"thread.h" #include #include #include #include #include  extern int status_1; extern int status_2;  void thread_0(char*pstr)//带参数 {     int counter = 10;     while(counter--)     {         sleep(1);         printf("%s\n",pstr);     }      pthread_exit(&status_1);//线程退出专用函数 }  void thread_1(void)//不带参数 {     int counter = 10;     while(counter--)     {         sleep(1);         printf("thread_1\n");     }           pthread_exit(&status_2);//线程退出专用函数 }    bool _creat_thread(pthread_t *thread, void *(*start_routine)(void *), void *arg, int SCOPE, int DETACH, int policy, int priority_val) {     struct sched_param param;     pthread_attr_t attr;         if(0 != pthread_attr_init(&attr))//初始化 结构体attr， 如果不需要attr需要取消attr, pthread_attr_destroy     {         perror("pthread_attr_init\n");         return false;            }          if(0 != pthread_attr_setscope(&attr, SCOPE))//设置线程属性 是否绑定 绑定(PTHREAD_SCOPE_SYSTEM)  非绑定(PTHREAD_SCOPE_PROCESS)     {         perror("pthread_attr_setscope\n");         return false;            }          if(0 != pthread_attr_setdetachstate(&attr, DETACH))//设置线程属性 是否分离 分离（PTHREAD_CREATE_DETACHED）  非分离（PTHREAD_CREATE_JOINABLE）     {         perror("pthread_attr_setdetachstate\n");         return false;        }          if(0 != pthread_attr_setschedpolicy(&attr, policy))//三种优先级策略选择 : SCHED_FIFO(值1-99), SCHED_RR(值1-99),  and SCHED_OTHER     {         perror("pead_attr_setschedpolicy\n");         return false;            }              if(priority_val>0 && priority_val<100)//判断优先级值是否在1－99范围     {         param.sched_priority = priority_val;      }     else     {         perror("priority_val_ wrong value range!!\n");     }               if(0 != pthread_attr_setschedparam(&attr, ¶m))//设置设置线程属性 优先级 通过 策略与值来判断如何调度     {         perror("pthread_attr_setschedparam\n");         return false;        }          if(0 != pthread_create(thread, &attr, (void*)start_routine,arg))// 建立一个含有以上属性的线程     {         perror("pthread_create\n");         return false;     }          if(0 != pthread_attr_destroy(&attr))//使用完后取消attr,      {         perror("pthread_attr_destroy\n");         return false;            }          return true; }

thread.h

#ifndef THREAD_H #define THREAD_H #include #include #include   void thread_0(char*);  void thread_1(void);  bool _creat_thread(pthread_t *,void *(*)(void *), void *, int, int, int, int);  #endif //end THREAD_H

main.c

#include"thread.h" #include #include #include #include #include  #define LOW_PRIO 1 #define HIGH_PRIO 2  int status_0 = 0; int status_1 = 1; int status_2 = 2;  int main(void) {     bool ret;     char *str = "thread_0\n";     pthread_t thd0,thd1;           ret = _creat_thread(&thd0, (void*)thread_0, str, PTHREAD_SCOPE_SYSTEM, PTHREAD_CREATE_JOINABLE, SCHED_FIFO, LOW_PRIO);// 创建一个线程 带参数级相应属性     if(ret)     {         printf("create thread successfully!\n");     }     else     {         perror("fail to create thread!\n");         exit(1);     }     ret = _creat_thread(&thd1, (void*)thread_1, NULL, PTHREAD_SCOPE_SYSTEM, PTHREAD_CREATE_JOINABLE, SCHED_FIFO, HIGH_PRIO);// 创建一个线程 不带参数，含相应属性     if(ret)     {         printf("create thread successfully!\n");     }     else     {         perror("fail to create thread!\n");         exit(1);     }      int * thd_exit_status = NULL ;          while(1)     {         sleep(1);         printf("main\n");                  if(0 != pthread_join(thd0,(void**)&thd_exit_status))//if th0 no more exist, pthread_join return erro and  the thd_exit_status = NULL         {             printf("thread_0 is not exist!!\n");             //exit(1);         }         else          {             if(NULL== thd_exit_status && 1 != *thd_exit_status)             {                 printf("pthd0 is runing\n");             }             else if(NULL!= thd_exit_status && 1 == *thd_exit_status)             {                 printf("pthd0 has been terminated and return status:%d\n", *thd_exit_status);             }                  }                  if(0 != pthread_join(thd1,(void**)&thd_exit_status))//if th0 no more exist, pthread_join return erro and  the thd_exit_status = NULL         {             printf("thread_1 is not exist!!\n");             //exit(1);         }         else         {             if(NULL == thd_exit_status && 2 != *thd_exit_status)             {                 printf("pthd_1 is runing\n");             }                          else if(NULL!= thd_exit_status && 2 == *thd_exit_status)             {                 printf("pthd_1 has been terminated and return status:%d\n", *thd_exit_status);             }         }     }          return 0; }

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