OB] address with the lock ownership information in Visual Studio .NET

Drawer Code 128 in Visual Studio .NET OB] address with the lock ownership information
OB] address with the lock ownership information
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ThreadCount :
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U n s t a rt e d T h r e a d : Bac kgroundThread : Pendl ngThread : DeadThread : 0 0
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Hosted Runtime : 1D 3692 SS68 28S6 1180 6104 1 2 3 4 S OSlO e6c 15c0 17S0 49c 17d8
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no PreEmptive ThreadOS] 001871a0 0018a838 0 0 1 a ff48 0 0 1 b 2 7 80 001b76b0 State 8a028 b228 8b028 b028 8b028 GC Enabled Enabled E n a b l ed Enabled Enabled GC A l l o c Context 00000000 : 00000000 00000000 : 00000000 00000000 : 00000000 00000000 : 00000000 00000000 : 00000000 Doma i n 0014f238 0014f238 0014f238 0014f 2 3 8 0014f 2 3 8 Lock Count 1 APT MTA MTA MTA ( F inalizer) E xception
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The third row contains the managed thread with a ThreadOBJ address of exee l aff48, which is the thread from the above lock ownership dumps So based on this, we now know that the thread with 10 3 currently owns the lock on object exe1 2 b l c 6 c You can also see that its Lock Count is 1 , which represents the total number of distinct monitors the target thread holds (and does not take into account recursive acquires)
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This is very useful, but we still haven't seen how to get debugging information about fat locks Once a lock is inflated from thin to fat, it will no longer be reported by ! DumpHe a p - t h i n lo c k Instead, you have to run the ! Syn c B l k command, optionally passing a specific sync block index as an argument When called without arguments, the sync blocks for all objects that are currently actively locked by a thread are shown ! Syn c B l k - a l l shows all sync blocks in the process, including those without current owners Imagine that, in the above example, a bunch of threads have entered the system and tried to acquire a lock on object elxelel l b 2 0 c 8 while thread ID 3 still owns it This would inflate the lock to a fat lock, as could be then seen by running the ! Syn c B l k 50S command
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> ! Sy n c B l k I n d e x Syn c B l o c k Mon itorHeld R e c u r s ion Own i n g T h r e a d I nfo S y n c B l o c k Own e r 19 5 ee1 b 2 1 8 c 2 ee1aff78 b 2 8 2 8 5 6 e 1 2 b 1 c 6 c System Obj e ct Tot a l CCW RCW ComC l a s s F actory F ree 11 e e e e
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We can see here that elxelel l a ff78 still owns the lock on object elxel1 2 b l c 6 c We also see that the recursion count reflected is 2 Unfortu nately the ! Syn c B l k command starts counting at I , versus the ! DumpH e a p and ! DumpOb j e c t commands which start counting a t O I n other words, a value of 1 means "no recursive acquires" instead of the value O Although neither ! DumpHe a p nor ! DumpOb j e ct will report lock ownership information for inflated locks, ! T h r e a d s will still account for fat lock acquisitions in its Lock Count column
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So far we've been talking about mechanisms to achieve complete mutual exclusion Often, mutual exclusion is a stronger guarantee than is
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