阻塞的线程很多时为何会发生死锁？急!(我是新用户，只有给50分的权利,Sorry!)
在驱动程序中，有一段处理硬盘I/O的非共享程序(较长，执行时间
大约在10到500ms，在该段程序的开端采用了互斥，一般情况下工作
正常。但在频繁的硬盘读写期间（例如，在Windows98里拷贝大量文件)，
鼠标响应会越来越慢，直至完全停止响应。估计是由于阻塞的线程太多
造成系统死锁。为什么会这样呢？还是有其他原因？应如何解决此问题，
还盼高手们帮帮我！急！急!!
问题点数：50、回复次数：7Top
1 楼blaise（）回复于 2000-03-02 12:16:00 得分 0
post your codeTop
2 楼deepwater（）回复于 2000-03-02 12:29:00 得分 0
I once had the same experiance
I guess if u run your progamm on NT it will be OK,your trouble on 95/98 attributes to the implmentation of 95/98 's multithread - If one thread of a process is reading/writing hard disk,the other processes or threads will not get CPU time unless the reading/writing is finished.
One solution which I took : Sleep for 100~200 ms in your thread which reads or writes hard disk
Tell me your result pleaseTop
3 楼deepwater（）回复于 2000-03-02 12:34:00 得分 0
Increase your buffer fo reading/writing,thus decrease the times of reading/writing hard disk.
In my last project,I used the two methodsTop
4 楼yehong（）回复于 2000-03-02 20:53:00 得分 0
致deepwater:我试过了，还是不行。我试着用提升优先级的办法，情况好一些，不是每次都死。大概有一半的机会不死。Top
5 楼yehong（）回复于 2000-03-02 21:55:00 得分 0
致blaise:
这是出问题部分的代码：
;code in initializing procedure
...
;Create mutex, if failure, abort resident
push ecx
push edx
VmmCall _CreateMutex, < 0, MUTEX_MUST_COMPLETE >
pop edx
pop ecx
or eax, eax
mov dMutex, eax
mov eax, ERROR_CREATE_MUTEX
jz lVSD_ret_CY
...
;==============================================================================
;
; Gate32_Write_Handler() - Handle writing routine for commands
;
; Entry: ebx is IOP
; Exit: al set to 0 to indicate calldown, set to 1 indication callback
; al set to 2 to indicate return without calldown or callback
;
; Destroys: eax
;
;==============================================================================
beginproc Gate32_Write_Handler
AssertIOP (ebx)
push edi
VmmCall Get_Cur_Thread_Handle ;use current thread handle as reenter flag (dInterFlag)
cmp edi, dInterFlag ;if it's reenter?
pop edi
xor eax, eax
jz lGWH_ret ;it's reenter, return to calldown
; enter mutex
push eax
push ecx
push edx
VmmCall _EnterMutex, <dMutex, 0>
pop edx
pop ecx
pop eax
; set current thread handle to dInterFlag
push edi
VmmCall Get_Cur_Thread_Handle
mov dInterFlag, edi
pop edi
Call Prv_Write_Handler ;该过程处理硬盘写操作，内部读写请求较多，耗时约10-500ms
mov dInterFlag, 0 ;clear reenter flag
push eax
push dMutex
VmmCall _LeaveMutex
add esp, 4
pop eax
lGWH_ret:
ret
endproc Gate32_Write_Handler
Top
6 楼netmare（）回复于 2000-03-02 23:25:00 得分 50
xor eax, eax
jz lGWH_ret ;it's reenter, return to calldown
这不对吧,这等于jmp lGWH_ret
Top
7 楼yehong（）回复于 2000-03-03 09:34:00 得分 0
哦，对了，谢谢netmare，这里本是mov eax, 0Top
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