Multithreaded example

In our example we'll use two threads:

Thread	Priority
A	High
B	Low

Now we'll watch them run, assuming both start at the same time:

Note: When logging starts, the instrumented kernel sends information about each thread. Existing processes will appear to be created during this procedure.

Time	Thread	Action	Explanation
t1	A	Create	Thread is created.
t2	A	Block	The thread is waiting for, say, I/O; it can't continue without it.
t3	B	Create	Rather than sit idle, the kernel runs next highest priority thread.
t4	B	Kernel Call	Thread B is working.
t4.5	N/A	N/A	I/O completed; Thread A is ready to run.
t5	B	Block	Thread A is now ready to run—it preempts thread B.
t6	A	Run	Thread A resumes.
t7	A	Dies	Its task complete, the thread terminates.
t8	B	Runs	Thread B continues from where it left off.
t9	...	...	...