-----Basic theory of Linux network programming

1. Learn the basic concepts of Linux network programming Primary Mastery

system resources	Refers to some active units (except storage devices) such as CPU and memory
Program	Refers to compiled binaries that are stored on disk and do not occupy system resources
Process	The program is relocated from the hard drive, resulting in one or more process schedules.
Concurrent----> Single channel program design	At the same time, multiple processes run concurrently and require CPU running resources, but only one process task consumes CPU resources at the same moment. Other process tasks can only be queued for the CPU process to finish executing
Concurrent----> Multi-Channel program design	At the same time, multi-process running simultaneously, need to occupy CPU running resources, CPU in the form of time slices, a time broken into a number of time slices, different time slices to perform different process debugging tasks.
Clock interrupt	CPU schedules a process task in the form of a time slice, and any process does not want to abandon CPU resources during execution, so the system needs a means of forcing the process to let the CPU resources out. Clock interrupts have a hardware base as a guarantee, an irresistible process, an interrupt handler in the operating system, to be responsible for high program execution.

2. CPU and MMU

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3. Process status

650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M02/82/74/wKiom1dVlYvRa3yRAAEpKEyHhRU559.png "title=" Process execution state "alt=" Wkiom1dvlyvra3yraaepkeyhhru559.png "/>

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-----Basic theory of Linux network programming