MANY-TO-ONE MODEL
• Many user-level threads mapped to single kernel thread.
• Used on systems that do not support kernel threads.
ONE-TO-ONE MODEL
• Each user-level thread maps to kernel thread.
• Creating a user thread requires creating the corresponding kernel thread.
• Windows NT/2000, OS/2
MANY-TO-MANY MODEL
• Allows many user level threads to be mapped to many kernel threads.
• Allows the operating system to create a sufficient number of kernel threads.
• Solaris 2 , IRIS, HP-UX
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