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ffffffff 00000001 003b4550 003b1120 00000000 baadf00d 000000e8 00000100
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Interestingly enough, the first element (0x79f96af0) doesn t seem to resemble a thread s state As a matter of fact, if we use the ln (list near) command, we can see the following:
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0:000> ln 79f96af0 (79f96af0) mscorwks!Thread::'vftable' | (79f96b28) Exact matches: mscorwks!Thread::'vftable' = <no type information>
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mscorwks!Thread::Thread
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We are seeing the virtual function table pointer of the object Although not terribly interesting from a debugging perspective, it can come in handy to convince ourselves that the pointer we are looking at is in fact a pointer to a valid thread object Because we can safely ignore this pointer for our current purposes, the next value is 0x00000220 This value looks like it may represent a bitmask of sorts but to interpret this bitmask in the context of a thread state, we must first enumerate the various bits that constitute a thread state The Thread class contains an enumeration that represents a thread s state called the ThreadState enumeration This enumeration can yield important clues when debugging synchronization problems Although the entire enumeration contains close to one hundred fields, some are more important than others when debugging synchronization issues Table 6-1 shows the most interesting fields of the ThreadState enumeration
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6 SYNCHRONIZATION
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Synchronization
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Table 6-1 ThreadState Enumeration
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Field Name Value Description
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TS_Unknown TS_AbortRequested TS_GCSuspendPending
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0x00000000 0x00000001 0x00000002
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TS_LegalToJoin TS_Background TS_Unstarted TS_Dead
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0x00000020 0x00000200 0x00000400 0x00000800
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TS_ThreadPoolThread TS_AbortInitiated TS_Finalized
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0x00800000 0x10000000 0x20000000
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TS_FailStarted
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0x40000000
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State of a newly initialized thread A thread abort has been requested This state indicates that the GC has requested that this thread be suspended and that the thread is trying to find a safe spot to suspend itself Thread is in a state where it can enter a Join Thread is a background thread Thread has never been started Thread is dead, meaning that the underlying OS thread is gone but the managed representation of the thread may still reside in memory Thread is a thread pool thread Indicates that a thread abort has begun The underlying managed thread object has been finalized and can be collected Thread failed to start
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Based on Table 6-1 and our previous state 0x00000220 , we can infer the following:
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The thread is a background thread (0x00000200) The thread is in a state where it can enter a Join (0x00000020) The thread is a newly initialized thread (0x00000000)
THREAD CLASS DISCLOSURE Although it may be useful to see the internals of a thread, it is important to realize that there is a good reason why this information is internal and not exposed through the threads command Much of the information is an implementation detail and Microsoft reserves the right to change it at any time Taking a dependency on these internal mechanisms is a dangerous prospect and should be avoided at all cost Secondly, Rotor is a reference implementation and does not guarantee that the internals mimic the CLR source code in detail
Thread Synchronization Primitives
Now that we have discussed how the CLR represents a thread internally, it is time to take a look at some of the most common synchronization primitives that the CLR exposes as well as how they are represented in the CLR itself
Events
The event is a kernel mode primitive accessible in user mode via an opaque handle An Event is a synchronization object that can take on one of two states: signaled or nonsignaled When an event goes from the nonsignaled state to the signaled state (indicating that a particular event has occurred), a thread waiting on that event object is awakened and allowed to continue execution Event objects are very commonly used to synchronize code flow execution between multiple threads For example, the native Win32 API ReadFile can read data asynchronously by passing in a pointer to an OVERLAPPED structure Figure 6-1 illustrates the flow of events The ReadFile returns to the caller immediately and processes the read operation in the background The caller is then free to do other work After the caller is ready for the results of the read operation, it simply waits (using the WaitForSingleObject API) for the state of the event to become signaled When