线程属性

线程属性 1. 初始化与销毁属性 int pthread_attr_init（pthread_attr_t *attr）; int pthread_attr_destroy（pthread_attr_t *attr）; 2. 获取与设置分离属性 int pthread_attr_getdetachstate(const pthread_attr_t *attr，int *detachstate); int pthread_attr_setdetachstate(const pthread_attr_t *attr，int detachstate); 3. 获取与设置栈的大小 int pthread_attr_setstacksize(pthread_attr_t *attr，size_t stacksize); int pthread_attr_getstacksize(pthread_attr_t *attr，size_t *stacksize); 4. 获取与设置栈溢出保护区大小 int pthread_attr_setguardsize(pthread_attr_t *attr，size_ stacksize); int pthread_attr_getguardsize(pthread_attr_t *attr，size_t *stacksize); 5. 获取与设置线程竞争而范围 int pthread_attr_setscope(pthread_attr_t *attr，int contenttionscope); int pthread_attr_getscope(pthread_attr_t *attr，int *contenttionscope); 6. 获取与设置调度策略 int pthread_attr_getschedpolicy(pthread_attr_t *attr，int *policy); int pthread_attr_setschedpolicy(pthread_attr_t *attr，int policy); 7. 获取与设置继承调度策略 int pthread_attr_getinheritsched(pthread_attr_t *attr，int *inheritsched); int pthread_attr_ setinheritsched (pthread_attr_t *attr，int inheritsched); 8. 获取与设置调度参数 int pthread_attr_getschedparam(pthread_attr_t *attr，struct sched_param *param); int pthread_attr_ setschedparam(pthread_attr_t *attr，const struct sched_param *param); 9. 获取与设置并发级别 int pthread_setconsurency(int new_level); int pthread_gettconsurency(void); 仅在N:M线程模型中有效，设置并发级别，给内核提供一个提示，表示提供给定级别数量的核心线程来映射用户线程是高效的。