The Great Symbian: THREAD SCHEDULING

THREAD SCHEDULING

Posted by ELIEZER

THREAD SCHEDULING

Distinction between user-level and kernel-level threads
OS only schedules kernel-level threads. User-level threads are scheduled through a direct or indirect (LWP) mapping
Many-to-one and many-to-many models, thread library schedules user-level threads to run on LWP

Known as process-contention scope (PCS) since scheduling competition is within the process

Kernel thread scheduled onto available CPU is system-contention scope (SCS) – competition among all threads in system
Typically – PCS is priority based. Programmer can set user-level thread priorities

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