线程 执行路径 上下文

多线程的start_routine指明了CPU的一个可执行流；

多线程的上线文说明了执行流现在的运行情况；

多线程的属性说明了上线文的数据结构。

https://computing.llnl.gov/tutorials/pthreads/

• pthread_create arguments:
  • thread: An opaque, unique identifier for the new thread returned by the subroutine. 
  • attr: An opaque attribute object that may be used to set thread attributes. You can specify a thread attributes object, or NULL for the default values. 
  • start_routine: the C routine that the thread will execute once it is created.
  • arg: A single argument that may be passed to start_routine. It must be passed by reference as a pointer cast of type void. NULL may be used if no argument is to be passed.