void
put_char_stderr (int c)
{
#ifdef RTX
RtPrintf ("%c", c);
#else
fputc (c, stderr);
#endif
}
void
put_int_stderr (int x)
{
#ifdef RTX
RtPrintf ("%d", x);
#else
fprintf (stderr, "%d", x);
#endif
}
void
put_char (int c)
{
#ifdef RTX
RtPrintf ("%c", c);
#else
putchar (c);
#endif
}
void
put_int (int x)
{
#ifdef RTX
RtPrintf ("%d", x);
#else
/* Use fprintf rather than printf, since the latter is unbuffered
on vxworks */
fprintf (stdout, "%d", x);
#endif
}
//_cdecl表示c语言的默认函数调用方法
void _cdecl
wmain(int argc, wchar_t **argv)
{
DWORD dwWaitStatus = 0;
unsigned int i;
SHARED_DATA_AREA * pData;
LARGE_INTEGER start, end, freq;
//LARGE_INTEG用来表示一项64位有符号整数值
LARGE_INTEGER roundTripNanoSecs[MAXREADWRITENANOSECSIZE];
//获取该程序运行的处理器索引
RtPrintf("SimpleIPCProducer: Started on Processor %d\n", GetCurrentProcessorNumber());
//创建共享内存区域，由于是同步读取内存区域，因此不需要加锁
//RtCreateSharedMemory的用法，查看RTX Helper
hSharedMem = RtCreateSharedMemory(PAGE_READWRITE, 0, sizeof(SHARED_DATA_AREA), _T("ProducerConsumerSample"), (void **)&pData);
//共享内存区分配失败
if(!pData)
{
RtPrintf("SimpleIPCProducer: RtCreateSharedMemory failed\n");
ExitProcess(0);
}
// pData的大小
pData->size = sizeof(SHARED_DATA_AREA);
// wcscpy为宽字符函数，复制
wcscpy( pData->id, _T("ProducerConsumerSample"));
// create events to share between producer and consumer
//创建事件
hEventProducerDone = RtCreateEvent(NULL, FALSE, FALSE, _T("ProducerDone"));
hEvent[EXECUTE_EVENT] = RtCreateEvent(NULL, FALSE, FALSE, _T("ConsumedDone"));
hEvent[TERMINATE_EVENT] = RtCreateEvent(NULL, FALSE, FALSE, _T("ProducerConsumerExit"));
// start loop
for(i=0; i< MAXREADWRITENANOSECSIZE; i++)
{
//QueryPerformanceCounter来精准计算执行时间
QueryPerformanceCounter(&start);
// 向共享内存区的producerData中填充数据
memset(pData->producerData, i, sizeof(pData->producerData));
// 发送ProducerDone的信号
RtSetEvent(hEventProducerDone);
//// 等待消费者的信号，dwWaitStatus保存返回状态
dwWaitStatus = RtWaitForMultipleObjects(2, hEvent, FALSE, INFINITE);
if (dwWaitStatus == WAIT_OBJECT_0 + TERMINATE_EVENT)
{
RtPrintf("SimpleIPCProducer: WaitForMultipleObjects failed\n");
RtSetEvent(hEvent[TERMINATE_EVENT]);
ExitProcess(0);
}
//执行结束
if (dwWaitStatus == WAIT_OBJECT_0 + EXECUTE_EVENT)
{
// check results，检查消费者是否读取数据
//if(pData->consumerData[0] != i)
if(memcmp(pData->producerData, pData->consumerData, sizeof(pData->producerData)) != 0)
{
RtPrintf("SimpleIPCProducer: Consumer failed to update data\n");
RtSetEvent(hEvent[TERMINATE_EVENT]);
ExitProcess(0);
}
QueryPerformanceCounter(&end);
//QueryPerformanceFrequency返回硬件支持的高精度计数器的频率
QueryPerformanceFrequency(&freq);
//如果编译器支持64位，直接使用QuadPart来保存运行时间，单位是纳秒
roundTripNanoSecs[i].QuadPart = (LONGLONG)((end.QuadPart - start.QuadPart) / ((double)(freq.QuadPart)/ (1000000000.0L)));
}
}
RtPrintf("SimpleIPCProducer: exit\n");
RtSetEvent(hEvent[TERMINATE_EVENT]);//发送结束事件
// give consumer a chance to exit，睡眠100毫秒
Sleep(100);
for(i = 1; i < MAXREADWRITENANOSECSIZE; i ++)
{
RtPrintf("roundTrip time of sample %d = %d(nanoseconds)\n", i, roundTripNanoSecs[i].QuadPart);
if(i > MAXREADWRITENANOSECSIZE - 1)
break;
}
ExitProcess(0);
}
