The entry contains the information about the process state , its program counter, stack pointer, memory allocation, the status of its open files, its accounting and the scheduling information, and everything else about the process that must be saved when the process is switched from running state to ready state or blocked state, so that it can be restarted later as if it had never been stopped.
The table given below shows some of the important fields in a typical system.
|Process Management||Memory Management||File Management|
|Registers||Pointer to text segment||Root directory|
|Program counter||Pointer to data segment||Working directory|
|Program status word||Pointer to stack segment||File descriptors|
|Stack pointer||User Identity|
|Process state||Group Identity|
|Time when process started|
|Central Processing Unit time used|
|Central Processing Unit time of Children|
|Time of next alarm|
The fields in the column one relate to process management, the fields in the column two related to the memory management, and the fields in the column three related to the file management.
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