测试内存屏障存在

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测试内存屏障存在：

#include <windows.h>  #include <stdio.h>  #include <assert.h>  typedef unsigned char u8;  typedef signed char s8;  typedef unsigned short u16;  typedef signed short s16;  typedef unsigned int u32;  typedef signed int s32;  BOOL state[2];  u8 turn;  static u32 count = 0;  u32 val = 1000000;  #define MEM_BARRIER() do {__asm {mfence}}while(0)  //#define MEM_BARRIER()  void lock(int id){state[id] = TRUE;  turn = 1 - id;  MEM_BARRIER();  while((turn  == (1 - id)) && state[1 - id]); }void unlock(int id){state[id] = FALSE; }DWORD WINAPI ThreadProc(LPVOID args)  {  short id = *(int*)args;  u32 num = 0;  while(num++ < val) {          lock(id);count++;          unlock(id);}  return 0;  }  int main(int argc, char* argv[])  {  HANDLE hThread[2];  while(1) {  int i=0,j=1;count = 0; turn  =  0; state[1] = state[0] = FALSE;  hThread[0] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadProc, &i, CREATE_SUSPENDED, NULL);  SetThreadAffinityMask( hThread[0], 0x01 );  hThread[1] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadProc, &j, CREATE_SUSPENDED, NULL);  SetThreadAffinityMask( hThread[1], 0x02 );  ResumeThread(hThread[0]);  ResumeThread(hThread[1]);  WaitForMultipleObjects(2, hThread, TRUE, INFINITE);  if(count != 2000000) {  printf("-----------\n");//__asm {int 3}  }  }  return 1;  }

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