幸运的是,C 标准库给我们提供了两种协程调度原语:一种是setjmp/longjmp,另一种是ucontext 组件,它们内部(当然是用汇编语言)实现了协程的上下文切换,相较之下前者在应用上会产生相当的不确定性(比如不好封装,具体说明参考联机文档),所以后者应用更广泛一些,网上绝大多数 C 协程库也是基于 ucontext 组件实现的。 “蝇...
Many modern UNIX operating systems implement a many-to-few model when mapping user-level threads to kernel entities. In this model, an arbitrarily large number of user-level threads is multiplexed onto a lesser number of kernel execution vehicles. Kernel execution vehicles are also known as virtua...
连接标记符 创建A.c和B.c两个文件,在两个文件中均创建send和receive两个线程。因为两个文件类似,这里以A.c为例,B.c同理。 在A.c中首先定义一个全局变量,用来标记两个管道是否连接,如果均连接成功,则flag=1,有任意一个管道断开则flag=0。 //全局变量,标记是否连接,两个管道中有一个断开,则flag变为0int...
C 语言函数 clone 在linux 中输入 man clone,即可得到它的说明书: 使用clone 函数,需要包含 <sched.h> 头文件,它的 C 语言原型如下: intclone(int(*fn)(void*),void*child_stack,intflags,void*arg, .../* pid_t *ptid, struct user_desc *tls, pid_t *ctid */); 能够看出,clone 函数是...
StateThreads是一个C的网络程序开发库,提供了编写高性能、高并发、高可读性的网络程序的开发库,支持UNIX-like平台。它结合了多线程编写并行成的简单性,一个进程支持多个并发,支持基于事件的状态机架构的高性能和高并发能力。 (译注:提供了EDSM的高性能、高并发、稳定性,“多线程”形式的简单编程方式,用setjmp和long...
Threads When an application is launched, the system creates a thread of execution for the application, called "main." This thread is very important because it is in charge of dispatching events to the appropriate user interface widgets, including drawing events. It is also the thread in which ...
Creating a Manager for Multiple Threads_翻译 The previous lesson showed how to define a task that executes on a separate thread. If you only want to run the task once, this may be all you need. If you want to run a task repeatedly on different sets of data, but you only need one ...