Henry's Points

To help me memorize, I list all process states for Linux, which is actually from UNIX.

• R – runnable which means the process has done a context switch and has the kernel.
• S – sleeping which means the process is waiting on I/O completion (blocked), a pipe, memory, etc.
• T – process has been stopped – sent a SIGSTOP usually with ctrl/z
• Z – zombie – a process that has a process image in memory but no context, ie., not swappable.
• O – means the process is the one that currenlty has the cpu

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