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Thread Synchronization in User Mode

Synchronization

Thread

线程同步

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Thread Synchronization in User Mode，如何處理多個thread 合作同步的問題 1.Interlocked互锁函数; 2.Cache line; 3.Critical Sections临界区;

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Thread Synchronization in

User Mode

如何處理多個

thread

合作同步的

問題

Outline



出了甚麼問題



Without interrupt

(

保證

incrementing of the

value is done atomically)



Interlocked functions

簡介



InterLockedExchanged

使用範例



InterLockedChange

使用範例



InterLockedCompareExchage

簡介



Cache lines

速度非常快

Waste CPU time

Outline



Advanced Thread Synchronization



Critical Sections

出了甚麼問題



兩個

thread

同時存取一個

global

variable

DWORD WINAPI Thread1(PVOID pvParam){

g_x++;

return(0);

}

DWORD WINAPI Thread2(PVOID pvParam){

g_x++;

return(0);

}

long g_x=0;

同時執行的造

成 g_x 的結

果不可預期！

g_x++;

相當於

MOV EAX,[g_x]

INC EAX

MOV [g_x], EAX

Without interrupt

(

保證

incrementing of the value is done

atomically)

同時執行 g_x++;

有可能

MOV EAX,[g_x]

INC EAX

MOV EAX,[g_x]

INC EAX

MOV [g_x], EAX

EAX=0

EAX=1

EAX=0

EAX=1

g_x=1

g_x++ 有必

要不能被中

斷！！

組合語言指令交互執行

EAX 加一的結果 ,

還沒存起來就被蓋掉了

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