Answer Posted / zahraa fatma
1. swapping:the operating system needs to release sufficient main memory to bring in a process that is ready to execute.
2.other OS reason :the operating system may suspend a background or utility process or a process that is suspected of causing a problem.
3.interactive user request :a user may wish to suspend execution of a program for purposes of debugging or in connection with the use of a resource .
4.timing:a process may be executed periodically (e.g.,an accounting or system monitoring process)and may be suspended while waiting for the next time interval .
5. parent process request:a parent process may wish to suspend execution of a descendant to examine or modify the suspended process ,or to coordinate the activity of various descendants.
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