如何在 WinDbg 中查看 .NET 并发集合？

Question

有没有什么有效的方法可以查看 ConcurrentQueue、ConcurrentDictionary、...、BlockingCollection 等并发集合的内容？

有一个不错的 extension netext，但这只能转储旧的和好的 Dictionary<..> 和 Hashtable。

老实说，我很惊讶我没有找到对此的任何支持，因为在实例中遍历 buckets、tails & heads 是一种非常缓慢的方法。

Answer 1

SOSEX' 如果您有支持 DML 的 WinDbg 版本，!mdt 命令似乎还不错，因为您随后可以单击 link 来显示和展开数组

ConcurrentQueue（注意m_array是可点击的link）：

0:000> !mdt 000007fe959f4770 0000000002614660 -r:5
0000000002614660 (System.Collections.Concurrent.ConcurrentQueue`1[[System.String, mscorlib]])
    m_head:0000000002614690 (System.Collections.Concurrent.ConcurrentQueue`1+Segment[[System.String, mscorlib]])
        m_array:00000000026146d0 (System.String[], Elements: 32)
        m_state:00000000026147e8 (System.Collections.Concurrent.VolatileBool[], Elements: 32, ElementMT=000007fef41022d8)
        m_next:NULL (System.Collections.Concurrent.ConcurrentQueue`1+Segment[[System.__Canon, mscorlib]])
        m_index:0x0 (System.Int64)
        m_low:0x0 (System.Int32)
        m_high:0x9 (System.Int32)
        m_source:0000000002614660 (System.Collections.Concurrent.ConcurrentQueue`1[[System.String, mscorlib]])
            <RECURSIVE>
    m_tail:0000000002614690 (System.Collections.Concurrent.ConcurrentQueue`1+Segment[[System.String, mscorlib]])
        m_array:00000000026146d0 (System.String[], Elements: 32)
        m_state:00000000026147e8 (System.Collections.Concurrent.VolatileBool[], Elements: 32, ElementMT=000007fef41022d8)
        m_next:NULL (System.Collections.Concurrent.ConcurrentQueue`1+Segment[[System.__Canon, mscorlib]])
        m_index:0x0 (System.Int64)
        m_low:0x0 (System.Int32)
        m_high:0x9 (System.Int32)
        m_source:0000000002614660 (System.Collections.Concurrent.ConcurrentQueue`1[[System.String, mscorlib]])
            <RECURSIVE>
    m_serializationArray:NULL (System.__Canon[])
    m_numSnapshotTakers:0x0 (System.Int32)

0:000> !mdt 00000000026146d0
00000000026146d0 (System.String[], Elements: 32)
expand all 32 items                                        <--- DML Link

0:000> !mdt -e:2 00000000026146d0
00000000026146d0 (System.String[], Elements: 32)
[0] 0000000002617508 "Hello WinDbg 0"
[1] 0000000002617670 "Hello WinDbg 1"
[2] 00000000026177d8 "Hello WinDbg 2"
[3] 0000000002617940 "Hello WinDbg 3"
[4] 0000000002617aa8 "Hello WinDbg 4"
[5] 0000000002617c10 "Hello WinDbg 5"
[6] 0000000002617d78 "Hello WinDbg 6"
[7] 0000000002617ee0 "Hello WinDbg 7"
[8] 0000000002618048 "Hello WinDbg 8"
[9] 00000000026181b0 "Hello WinDbg 9"

ConcurrentDictionary（注意m_buckets是可点击的link）

0:000> !mdt 0000000002614820 -r:6
0000000002614820 (System.Collections.Concurrent.ConcurrentDictionary`2[[System.String, mscorlib],[System.String, mscorlib]])
    m_tables:0000000002614eb0 (System.Collections.Concurrent.ConcurrentDictionary`2+Tables[[System.String, mscorlib],[System.String, mscorlib]])
        m_buckets:0000000002614d98 (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.String, mscorlib],[System.String, mscorlib]][], Elements: 32)
        m_locks:00000000026148e8 (System.Object[], Elements: 32)
        m_countPerLock:0000000002614d00 (System.Int32[], Elements: 32)
        m_comparer:00000000026148d0 (System.Collections.Generic.GenericEqualityComparer`1[[System.String, mscorlib]])
    m_comparer:NULL (System.Collections.Generic.IEqualityComparer`1[[System.__Canon, mscorlib]])
    m_growLockArray:true (System.Boolean)
    m_keyRehashCount:0x0 (System.Int32)
    m_budget:0x1 (System.Int32)
    m_serializationArray:NULL (System.Collections.Generic.KeyValuePair`2[[System.__Canon, mscorlib],[System.__Canon, mscorlib]][])
    m_serializationConcurrencyLevel:0x0 (System.Int32)
    m_serializationCapacity:0x0 (System.Int32)

0:000> !mdt 0000000002614d98
0000000002614d98 (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.String, mscorlib],[System.String, mscorlib]][], Elements: 32)
expand all 32 items                                        <--- DML Link

0:000> !mdt -e:2 0000000002614d98
0000000002614d98 (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.String, mscorlib],[System.String, mscorlib]][], Elements: 32)
[...]
[18] 0000000002618148 (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.String, mscorlib],[System.String, mscorlib]])
    m_key:00000000026180b8 (System.String) Length=7, String="Hello 8"
    m_value:0000000002618118 (System.String) Length=8, String="WinDbg 8"
    m_next:NULL (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.__Canon, mscorlib],[System.__Canon, mscorlib]])
    m_hashcode:0xd0fe55d2 (System.Int32)
[19] 00000000026182b0 (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.String, mscorlib],[System.String, mscorlib]])
    m_key:0000000002618220 (System.String) Length=7, String="Hello 9"
    m_value:0000000002618280 (System.String) Length=8, String="WinDbg 9"
    m_next:NULL (System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.__Canon, mscorlib],[System.__Canon, mscorlib]])
    m_hashcode:0xd0fe55d3 (System.Int32)

Answer 2

感谢 Mikhail Polgun 的代码贡献，NetExt 现在正在实施 !wconcurrentdict。

!wconcurrentdict <address>
<address> - Address of the dictionary.

Examples:

Dumps a dictionary
------------------------
0:000> wconcurrentdict 00000001557d3920
Items   : 1
[0]:==============================================
System.__Canon key = 00000001557d2a70 CompilerVersion
System.__Canon value = 00000001557d2aa8 v2.0

在此处下载 NetExt 的 zip：https://github.com/rodneyviana/netext/tree/master/Binaries

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