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![]() ![]() ![]() (This is generally considered a last resort and not good application design.) The blocked thread is terminated by the system for example, the process itself is terminated, or another thread calls the TerminateThread function using the blocked thread's handle.Another thread in the process calls the CancelSynchronousIo function using the blocked thread's thread handle, which terminates I/O for that thread, failing the I/O operation.An error was made in the call itself (for example, one or more parameters are not valid).(For example, the pipe is closed from the other end.) The I/O operation completes (in this example, a data write).If a file or device is opened for synchronous I/O (that is, FILE_FLAG_OVERLAPPED is not specified), subsequent calls to functions such as WriteFile can block execution of the calling thread until one of the following events occurs: Synchronous and Asynchronous I/O Considerations In other words, there are usually multiple ways to solve the problem. The mechanisms and implementation details of how to accomplish these tasks vary depending on the type of device handle that is used and the particular needs of the application. In this case, synchronous I/O would be better. However, for relatively fast I/O operations, the overhead of processing kernel I/O requests and kernel signals may make asynchronous I/O less beneficial, particularly if many fast I/O operations need to be made. In situations where an I/O request is expected to take a large amount of time, such as a refresh or backup of a large database or a slow communications link, asynchronous I/O is generally a good way to optimize processing efficiency. The two synchronization types are illustrated in the following figure. It then interrupts its current job and processes the data from the I/O operation as necessary. If the request is accepted by the kernel, the calling thread continues processing another job until the kernel signals to the thread that the I/O operation is complete. A thread performing asynchronous file I/O sends an I/O request to the kernel by calling an appropriate function. In synchronous file I/O, a thread starts an I/O operation and immediately enters a wait state until the I/O request has completed. Asynchronous I/O is also referred to as overlapped I/O. There are two types of input/output (I/O) synchronization: synchronous I/O and asynchronous I/O. ric / ˌdōsəˈmetrik/ adj.Also see I/O-related sample applications.a device used to measure an absorbed dose of ionizing radiation. An external peripheral interface standard for communication between a computer and external peripherals over lo… dosimeter, do It a… Gallium Arsenide, gallium arsenide (GaAs) devices Semiconductor integrated-circuit devices that are implemented using gallium arsenide as the intrinsic semiconductor m… Usb, USB Abbrev. A scheme for connecting hard disks to microcomputers with a serial transfer rate of 10–25 bps. a plastic or metal coil, spiral, or other shape, about 25 mm long, that is inserted into the cavity of th… Esa-Pekka Salonen, ESDI Abbrev. , IUCD (intrauterine contraceptive device) n. ∎ an exp… IUCD (intrauterine contraceptive device) n. a mechanical or electronic contrivance: a measuring device. a thing made or adapted for a particular purpose, esp.
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