You studied threads and noticed the thread_yield system call.  Why would a thread volunteer to give up running in the CPU using this system call, it might not get to run in the CPU again if it does this?

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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You studied threads and noticed the thread_yield system call.  Why would a thread volunteer to give up running in the CPU using this system call, it might not get to run in the CPU again if it does this? 

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