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ntdll!NtWaitForSingleObject+0xc
要确认这个说法需要确认后面那个＋0xc的具体含义吧。

这个是具体的代码，有些可以确定的东西没有必要去猜测：

page , 132
subttl "RtlEnterCriticalSection"

;++
;
; NTSTATUS
; RtlEnterCriticalSection(
; IN PRTL_CRITICAL_SECTION CriticalSection
; )
;
; Routine Description:
;
; This function enters a critical section.
;
; Arguments:
;
; CriticalSection - supplies a pointer to a critical section.
;
; Return Value:
;
; STATUS_SUCCESS or raises an exception if an error occured.
;
;--

align 16
cPublicProc _RtlEnterCriticalSection,1
cPublicFpo 1,0

mov ecx,fs:PcTeb ; get current TEB address
mov edx,CriticalSection ; get address of critical section
cmp CsSpinCount[edx],0 ; check if spin count is zero
jne short Ent40 ; if ne, spin count specified

;
; Attempt to acquire critical section.
;

Lock1: ;
lock inc dword ptr CsLockCount[edx] ; increment lock count
jnz short Ent20 ; if nz, already owned

;
; Set critical section owner and initialize recursion count.
;

Ent10:
if DBG
cmp CsOwningThread[edx],0
je @F
stdCall _RtlpCriticalSectionIsOwned, <edx>
mov ecx,fs:PcTeb ; get current TEB address
mov edx,CriticalSection ; get address of critical section
@@:
endif ; DBG
mov eax,TbClientId + 4[ecx] ; get current client ID
mov CsOwningThread[edx],eax ; set critical section owner
mov dword ptr CsRecursionCount[edx],1 ; set recursion count

if DBG

inc dword ptr TbCountOfOwnedCriticalSections[ecx] ; increment owned count
mov eax,CsDebugInfo[edx] ; get debug information address
inc dword ptr CsEntryCount[eax] ; increment entry count

endif ; DBG

xor eax,eax ; set success status

stdRET _RtlEnterCriticalSection

;
; The critical section is already owned, but may be owned by the current thread.
;

align 16
Ent20: mov eax,TbClientId + 4[ecx] ; get current client ID
cmp CsOwningThread[edx],eax ; check if current thread is owner
jne short Ent30 ; if ne, current thread not owner
inc dword ptr CsRecursionCount[edx] ; increment recursion count

if DBG

mov eax,CsDebugInfo[edx] ; get debug information address
inc dword ptr CsEntryCount[eax] ; increment entry count

endif ; DBG

xor eax,eax ; set success status

stdRET _RtlEnterCriticalSection

;
; The critcal section is owned by another thread and the current thread must
; wait for ownership.
;

Ent30: stdCall _RtlpWaitForCriticalSection, <edx> ; wait for ownership
mov ecx,fs:PcTeb ; get current TEB address
mov edx,CriticalSection ; get address of critical section
jmp Ent10 ; set owner and recursion count

;
; A nonzero spin count is specified.
;

align 16
Ent40: mov eax,TbClientId + 4[ecx] ; get current client ID
cmp CsOwningThread[edx],eax ; check if current thread is owner
jne short Ent50 ; if ne, current thread not owner

;
; The critical section is owned by the current thread. Increment the lock
; count and the recursion count.
;

Lock6: ;
lock inc dword ptr CsLockCount[edx] ; increment lock count
inc dword ptr CsRecursionCount[edx] ; increment recursion count

if DBG

mov eax,CsDebugInfo[edx] ; get debug information address
inc dword ptr CsEntryCount[eax] ; increment entry count

endif ; DBG

xor eax,eax ; set success status

stdRET _RtlEnterCriticalSection

;
; A nonzero spin count is specified and the current thread is not the owner.
;

align 16
Ent50: push CsSpinCount[edx] ; get spin count value
Ent60: mov eax,-1 ; set comparand value
mov ecx,0 ; set exchange value

Lock7:
lock cmpxchg dword ptr CsLockCount[edx],ecx ; attempt to acquire critical section
jnz short Ent70 ; if nz, critical section not acquired

;
; The critical section has been acquired. Set the owning thread and the initial
; recursion count.
;

add esp,4 ; remove spin count from stack
mov ecx,fs:PcTeb ; get current TEB address
mov eax,TbClientId + 4[ecx] ; get current client ID
mov CsOwningThread[edx],eax ; set critical section owner
mov dword ptr CsRecursionCount[edx],1 ; set recursion count

if DBG

inc dword ptr TbCountOfOwnedCriticalSections[ecx] ; increment owned count
mov eax,CsDebugInfo[edx] ; get debug information address
inc dword ptr CsEntryCount[eax] ; increment entry count

endif ; DBG

xor eax,eax ; set success status

stdRET _RtlEnterCriticalSection

;
; The critical section is currently owned. Spin until it is either unowned
; or the spin count has reached zero.
;
; If waiters are present, don't spin on the lock since we will never see it go free
;

Ent70: cmp CsLockCount[edx],1 ; check if waiters are present,
jge short Ent76 ; if ge 1, then do not spin

Ent75: YIELD
cmp CsLockCount[edx],-1 ; check if lock is owned
je short Ent60 ; if e, lock is not owned
dec dword ptr [esp] ; decrement spin count
jnz short Ent75 ; if nz, continue spinning
Ent76: add esp,4 ; remove spin count from stack
mov ecx,fs:PcTeb ; get current TEB address
jmp Lock1 ;

stdENDP _RtlEnterCriticalSection

新的SDk EnterCriticalSection在多核的机器上会首先有个自选量，之后才等待挂起。反正MS也没公布EnterCriticalSection的实现细节，现在调用了，没准以后又不用WaitForSingleObject实现了

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