我有一个基于3.5构建的多线程wpf应用。当我通过进程资源管理器查看运行中的线程时,我看到了8个线程,它们的起始地址都相同,即ntdll.dll!RtlUserThreadStart,并且所有八个线程的CPU值都在3-6+之间,并且具有高循环间隔。我无法确定这些线程正在做什么。它们总是相同的线程,同一应用程序实例内从不变化。同时进行应用程序调试并暂停调试器时,所有这些线程都显示堆栈的单个行,要么是System.Threading.ConcurrencyScheduler.Scheduler.WaitForWork(),要么是System.Threading.Monitor.Wait()。
我启用了Visual Studio的符号文件,并在那些线程上看到了以下堆栈:
System.Threading.Monitor.Wait() Normal
mscorlib.dll!System.Threading.Monitor.Wait(object obj, int millisecondsTimeout) + 0x19 bytes
System.Threading.dll!System.Threading.ConcurrencyScheduler.Scheduler.WaitForWork() + 0xd0 bytes
System.Threading.dll!System.Threading.ConcurrencyScheduler.InternalContext.Dispatch() + 0x74a bytes
System.Threading.dll!System.Threading.ConcurrencyScheduler.ThreadInternalContext.ThreadStartBridge(System.IntPtr dummy) + 0x9f bytes
当我查看进程监视器中提供的线程堆栈时,以下是一些示例:
0 ntoskrnl.exe!KeWaitForMultipleObjects+0xc0a
1 ntoskrnl.exe!KeAcquireSpinLockAtDpcLevel+0x732
2 ntoskrnl.exe!KeWaitForSingleObject+0x19f
3 ntoskrnl.exe!_misaligned_access+0xba4
4 ntoskrnl.exe!_misaligned_access+0x1821
5 ntoskrnl.exe!_misaligned_access+0x1a97
6 mscorwks.dll!InitializeFusion+0x990b
7 mscorwks.dll!DeleteShadowCache+0x31ef
或者:
0 ntoskrnl.exe!KeWaitForMultipleObjects+0xc0a
1 ntoskrnl.exe!KeAcquireSpinLockAtDpcLevel+0x732
2 ntoskrnl.exe!KeWaitForSingleObject+0x19f
3 ntoskrnl.exe!_misaligned_access+0xba4
4 ntoskrnl.exe!_misaligned_access+0x1821
5 ntoskrnl.exe!KeAcquireSpinLockAtDpcLevel+0x93d
6 ntoskrnl.exe!KeWaitForMultipleObjects+0x26a
7 ntoskrnl.exe!NtWaitForSingleObject+0x41f
8 ntoskrnl.exe!NtWaitForSingleObject+0x78e
9 ntoskrnl.exe!KeSynchronizeExecution+0x3a23
10 ntdll.dll!ZwWaitForMultipleObjects+0xa
11 KERNELBASE.dll!GetCurrentProcess+0x40
12 KERNEL32.dll!WaitForMultipleObjectsEx+0xb3
13 mscorwks.dll!CreateApplicationContext+0x10499
14 mscorwks.dll!CreateApplicationContext+0xbc41
15 mscorwks.dll!StrongNameFreeBuffer+0xc54d
16 mscorwks.dll!StrongNameFreeBuffer+0x2ac48
17 mscorwks.dll!StrongNameTokenFromPublicKey+0x1a5ea
18 mscorwks.dll!CopyPDBs+0x17362
19 mscorwks.dll!CorExitProcess+0x3dc9
20 mscorwks.dll!TranslateSecurityAttributes+0x547f
21 mscorlib.ni.dll+0x8e6bc9
关于这个问题的补充说明。我的计算机是单个CPU,有4个内核。当我们在一个双CPU,4个内核的计算机上运行相同的应用程序时,我们会看到线程数量从8个增加到16个。