深圳网站建设网络,网页的优化,帮人做传销网站违法吗,wordpress邮箱验证失败#xff11;、多线程的作用#xff1a; 即什么情况考虑使用多线程#xff1f;#xff12;、多线程的创建#xff1a; 默认参数创建即可#xff01;pthread_create(tid,NULL,(void *)thread_func,NULL);#xff13;、多线程的同步#xff1a; 掌握互斥#xff…、多线程的作用 即什么情况考虑使用多线程、多线程的创建 默认参数创建即可pthread_create(tid,NULL,(void *)thread_func,NULL);、多线程的同步 掌握互斥条件 两种同步方式即可表 1. 线程函数列表对象操作Linux Pthread APIWindows SDK 库对应 API线程创建pthread_createCreateThread退出pthread_exitThreadExit等待pthread_joinWaitForSingleObject互斥锁创建pthread_mutex_initCreateMutex销毁pthread_mutex_destroyCloseHandle加锁pthread_mutex_lockWaitForSingleObject解锁pthread_mutex_unlockReleaseMutex条件创建pthread_cond_initCreateEvent销毁pthread_cond_destroyCloseHandle触发pthread_cond_signalSetEvent广播pthread_cond_broadcastSetEvent / ResetEvent等待pthread_cond_wait / pthread_cond_timedwaitSingleObjectAndWait但我还有一个问题、主线程是否比默认创建的线程优先级更高我用如下测试代码及运行结果说明问题#include #include #include #include void Thread_1(){printf(%s pid :0x%x, tid :0x%x \n,__func__, getpid(), (int)pthread_self());int i0,j0;while(1){for(j1;j5000000;j){}//sleep(1); // 删除sleep,每个线程都全力运行i;printf(%s, %d\n, __func__, i);}}void Thread_2(){printf(%s pid :0x%x, tid :0x%x \n,__func__, getpid(), (int)pthread_self());int i0,j0;while(1){for(j1;j5000000;j){}//sleep(1);i;printf(%s, %d\n, __func__, i);}}void Thread_3(){printf(%s pid :0x%x, tid :0x%x \n,__func__, getpid(), (int)pthread_self());int i0,j0;while(1){for(j1;j5000000;j){}//sleep(1);i;printf(%s, %d\n, __func__, i);}}void Thread_main(){printf(%s pid :0x%x, tid :0x%x \n,__func__, getpid(), (int)pthread_self());int i0,j0;while(1){for(j1;j5000000;j){}//sleep(1);i;printf(%s, %d\n, __func__, i);}}int main(){pthread_t ppid1,ppid2,ppid3;printf(%s pid :0x%x, tid :0x%x \n,__func__, getpid(), (int)pthread_self());pthread_create(ppid1,NULL,(void *)Thread_1,NULL);pthread_create(ppid2,NULL,(void *)Thread_2,NULL);pthread_create(ppid3,NULL,(void *)Thread_3,NULL);Thread_main();return 0;}编译执行结果如下$gcc test.c -lpthread$ ./a.out删除sleep,每个线程都全力运行运行结果可以看出主线程没有明显的级别优先。应避免使用“父线程”和“子线程”的说法main pid :0x71c5, tid :0x65bfa720Thread_2 pid :0x71c5, tid :0x64c4b700Thread_main pid :0x71c5, tid :0x65bfa720Thread_1 pid :0x71c5, tid :0x6544c700Thread_3 pid :0x71c5, tid :0x6444a700Thread_main, 1Thread_3, 1Thread_1, 1Thread_2, 1Thread_main, 2Thread_3, 2Thread_1, 2Thread_main, 3Thread_2, 2Thread_3, 3Thread_main, 4Thread_1, 3Thread_2, 3Thread_main, 5Thread_3, 4Thread_1, 4Thread_main, 6Thread_2, 4Thread_3, 5Thread_main, 7Thread_1, 5Thread_2, 5Thread_3, 6Thread_main, 8Thread_1, 6Thread_2, 6Thread_main, 9Thread_3, 7Thread_1, 7Thread_main, 10Thread_2, 7Thread_3, 8Thread_main, 11Thread_1, 8Thread_2, 8Thread_main, 12Thread_3, 9Thread_1, 9Thread_2, 9Thread_main, 13Thread_3, 10Thread_1, 10Thread_main, 14Thread_2, 10Thread_3, 11Thread_1, 11Thread_main, 15Thread_2, 11Thread_3, 12Thread_main, 16Thread_1, 12Thread_2, 12Thread_main, 17Thread_3, 13Thread_2, 13Thread_main, 18Thread_3, 14Thread_1, 13Thread_2, 14Thread_main, 19Thread_3, 15Thread_1, 14Thread_2, 15Thread_main, 20Thread_3, 16Thread_main, 21Thread_2, 16Thread_1, 15Thread_main, 22Thread_3, 17Thread_2, 17Thread_main, 23Thread_1, 16Thread_3, 18Thread_2, 18Thread_main, 24Thread_1, 17Thread_2, 19Thread_3, 19Thread_main, 25Thread_3, 20Thread_2, 20Thread_main, 26Thread_1, 18Thread_main, 27Thread_2, 21Thread_3, 21Thread_1, 19Thread_main, 28Thread_2, 22Thread_3, 22Thread_main, 29Thread_1, 20Thread_3, 23Thread_2, 23Thread_main, 30Thread_1, 21Thread_2, 24Thread_3, 24Thread_main, 31Thread_1, 22Thread_main, 32Thread_3, 25Thread_2, 25Thread_main, 33Thread_1, 23Thread_2, 26Thread_3, 26Thread_main, 34Thread_1, 24Thread_3, 27Thread_2, 27Thread_main, 35Thread_1, 25Thread_2, 28Thread_main, 36Thread_3, 28Thread_main, 37Thread_1, 26Thread_3, 29Thread_2, 29Thread_main, 38Thread_1, 27Thread_3, 30Thread_main, 39..........Thread_main, 3736 Thread_2, 3671 Thread_1, 2888 Thread_main, 3737 Thread_3, 2840 Thread_2, 3672
