HUST OS 4.2 the process of self-control [notes]

Copyright: learning, can there be so many rules ~ https://blog.csdn.net/Irish_Moonshine/article/details/91128173

4.2 Process Control

4.2.1 Process control concepts:

4.2.2 windows process control

4.2.3 Linux Process Control

4.2.1 Process control concepts:

• During the whole process of living, their overall behavior of the control of
  four typical control behavior

1. Process Create
   Create a blank PCB
   is obtained and given process identifier ID
   for the process allocates space
   initialization PCB
   into the appropriate process queue (ready default)
2. The process of revocation
   revocation of a specified process
   to recover the process share some resources, revoke the process of PCB
   [recursive revocation of the child]
   3. The process of blocking
   to stop the implementation process, becomes blocked.
   Blocking time / event
   Request System Services / start some action / new data has not arrived / no new jobs can be used

4. Process wake
wake up in a process of blocking queue which
caused time to wake up / events: The system does not meet the service becomes satisfied / I / O completion
/ new data arrives / process put forward a new request (service)

4.2.2 windows process control

CreateProcess () // create a new process

• Creating a new process:
  1. Create a process kernel object, create a virtual address space
  2. EXE load and / or DLL code and data into the address space
  3. Create a thread and the main thread kernel object
  4. Start the main thread, into the main function ( main)

• End Process:
  ExitProcess (inform the operating system they were going to end, mild end)
  the TerminateProcess (forcibly terminated by the Task Manager to end the violence)

4.2.3 Linux Process Control

Create a process fork ()
returns an integer pid_t

pid_t pid = fork()

exec function cluster (includes a number of functions)
Function:
Load a specified executable program run
the child process and the parent process has completely different new features