It are explained that system structure synchronous signals I / O method and main controlled software .

论述了系统结构， 同步信号的获取、计算机控制 输出的方法以及主要实时控制软件的功能，并给出了部分框图。

Synchronous writing to the log makes the speed of the I / O important therefore it is preferable to use a write cache for the disks on which the log is located .

对日志的 同步的写使得 I/O的速度变得重要，所以最好把写高速缓存用于日志所在的磁盘。

Presently most operation systems supply synchronous method to implement I / O requests but in this case blocked processes and handling interrupts produce negative performance .

目前的操作系统通常支持 同步处理 I/O请求，但因此产生的进程的阻塞和中断响应处理将对服务器处理 I/O请求的效率产生负面影响。

Some VICs ( Virtual Instrument Controls ) may have built in threads . So that operating models such as synchronous read overlapped I / O and call back can be carried out in the thread .

部分虚拟仪器控件之中含有线程，在这些线程中可以实现 阻塞调用、重叠 I ／ O、事件监听以及回调等操作模式。

Those are valuable activities but since a Commit always involves a synchronous I / O ( to the log ) and insert doesn 't the overhead of a Commit can easily be higher than that of an insert .

这些都是有价值的活动，但是因为Commit总是要牵涉到 同步 I/O（对于日志），而insert则不会，所以Commit的开销很容易高于insert的开销。

Synchronous PPRC causes each write to the primary volume to be performed to the secondary as well and the I / O is only considered complete when the update to both primary and secondary have completed .

同步PPRC使主卷的每次写操作同时在辅助卷上执行，只有当主卷和辅助卷上的更新都完成时， I/O才被视为完成。

Synchronous and asynchronous I / O refers to whether or not an application is waiting for the I / O to complete to begin processing .

同步和异步 I/O指的是，应用程序是否等待I/O的完成以开始进行处理。

In this paper the cycloconverter-fed control system is studied based on DSP . The zero-crossing detection circuits synchronous signal detection circuits and I / O expansion circuits are designed .

研究了基于DSP的三相交-交变频控制系统，并设计了相应的零电流检测电路， 同步信号检测电路和 I/O扩展电路。

In the process the multithreading timer double-buffer and synchronous object etc have been used the system stability and real-time quality are effectively assured the function of high speed digital image card is realized by digital I / O card .

在实现过程中采用了多线程、定时器、双缓存和 同步对象等技术，有效保证了光谱数据采集、存储与显示的稳定性、实时性，用高速数字 采集卡实现 了高速数字图像采集卡的功能。