Linux application Development-Process Control theory

Source: Internet
Author: User

Linux Application Development-Process Control theory one process


A process is a run-time activity of a program with a certain independent function.


Two process features and status  


Dynamic


Concurrency


Independence


Async


Status Ready execution blocking


Three scheduling algorithm


Process scheduling: A certain algorithm, from a set of processes to run to select one to occupy the CPU run.


First come first service


Short process priority scheduling


High priority priority scheduling


Time slice rotation


Four scheduling mode


After having the process and scheduling algorithms waiting to run, the next question to discuss is: When will it be dispatched?


Schedule can be divided into:


Preemptive scheduling


non-preemptive scheduling


Five deadlock


Multiple processes seize the same resource and form an impasse, Causes these processes to continue executing




Six process ID


process Id:pid


Parent process id:ppid


Start process user Id:uid


Eight critical resources


Concept-critical resource  


The operating system will allow only one


process access to a resource at the same time as a critical resource. The program code for accessing critical resources in the


Nine critical section


process is called the


critical section. To achieve mutually exclusive access to critical resources,


should ensure that the processes are mutually exclusive to their critical sections.
 
10 Process Synchronization

a process in which a set of processes are executed in a certain order is called synchronization between processes


. This set of processes with a synchronization relationship is called a


process, most notably producer and consumer processes.

Linux application Development-Process Control theory

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