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it exceeds its quantum-which is just a specific period of time that varies from one as SKU to the next If there are other threads waiting to execute when the quantum expires, the as may use a context switch to allow the other thread to run on the processor instead The Windows thread scheduler is also priority based All processes in a system are given a priority class and individual threads within those processes may be assigned even finer-grained priorities The scheduler will always prefer to run the thread with the highest priority in the system and will preempt lower priority threads that are already running should a higher priority thread become runnable There are some exceptions in which the as will let another lower priority thread run before a higher pri ority one, normally to combat the possibility of starvation; this can happen if there are always higher priority threads ready to run, because they would otherwise always get preference over the lower priority threads The scheduler is strictly thread based and not process based at all This means, for example, that if there are two processes running, one of which has nine always running threads and the other one, all at equal priority, then the first process will receive 90 percent of the processor time while the other gets the remaining 1 0 percent (Each thread gets 1 0 percent) People often expect that each process will receive a fair amount of processor time-in this case, that would mean that both processes will receive 50 percent apiece-but Windows does not work this way
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Thread States A thread goes through a transition between several logical states throughout its execution
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Initialized (0) : currently being allocated and initialized by the as Ready 0 ): ready to run (aka runnable) and is in the thread sched uler's dispatcher database After a thread has been initialized, it transitions into this state, so long as the C R E AT E_SU S P E N D E D flag was not passed Running (2) : actively running on a processor Standby (3): has been selected to run on a processor, but has not physically begun executing yet It is no longer under consideration
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i n the dispatcher queue, and may or may not make i t t o Running depending on whether the thread is context switched out before hand There is a state that was added to Windows Server 2003, Deferred Ready (7), which effectively indicates the same condition
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Terminated (4) : has finished running code, and will be destroyed once all outstanding HAND L E s to its object are closed Waiting (5) : not under consideration for execution by the thread scheduler A transition to this state is made anytime a thread volun tarily sleeps, waits on a kernel synchronization object, or performs an I / O activity Thread suspension also places the suspended thread into the Waiting state until it has been resumed, thus threads created with the C R EATE_SUS P E N D E D flag transition directly from Initialized to Waiting after creation Transition (6) : this state reflects the fact that a thread could otherwise be runnable, but is temporarily ineligible because some important pageable kernel memory needed for to run has been paged to the disk, for example, kernel-mode stack The thread will transition back to Ready once the data is faulted back into physical memory
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While there are no simple Win32 APIs accessible to query a thread's state, you can access it through performance counters You can access the performance counter APIs or simply view them in the Windows Perfor mance Monitor (perfmonexe) application The counter "Thread \ Thread State" reports back the current state number (see above) for a particular thread Related, there is also a "Thread \ Thread Wait Reason" counter, which indicates the reason a thread is in the Waiting state The possible values here follow
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Executive (0) : waiting for a kernel executive object to become signaled, such as a mutex, semaphore, event, etc Free Page (1 ) : waiting for a free virtual memory page Page-in (2) : waiting for a virtual memory page to be backed by physical RAM, that is, to be paged into memory Page-out ( 1 2) : waiting for a virtual memory page to be paged out to disk
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