Traditional IO
Traditional I/O data transmission refers to a method of data transmission using input/output (I/O) operations in a computer system. This approach usually involves transferring data from memory to an external device (such as disk, network, etc.) or from an external device to memory. Traditional I/O data transmission usually adopts a blocking method, that is, the current thread or process will be blocked during data transmission until the data transmission is completed or an error occurs.
In traditional I/O data transmission, the following key concepts are usually involved:
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File I/O: File I/O refers to data transfer through file operations, including reading and writing files. Traditional file I/O operations are usually blocking, and read and write operations wait for data to be read or written from the file to complete.
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Network I/O: Network I/O refers to data transmission over the network, including reading data from the network or writing data to the network. In traditional network programming, blocking methods are usually used for data transmission, such as traditional Socket programming.
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Blocking I/O: Blocking I/O means that when data is transferred, the calling thread will be blocked until the data transfer operation is completed or an error occurs. This means that during data transfer, the thread cannot perform other tasks.
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Synchronous I/O: Synchronous I/O means that the data transfer operation requires the calling thread to wait for the data transfer to complete before continuing to perform subsequent operations.
The traditional I/O data transmission method may have performance problems in some scenarios, especially in high concurrency situations. The blocking method may cause thread blocking, affecting the throughput and response performance of the system. In order to solve these problems, non-blocking I/O, multi-threading, asynchronous programming and other technologies were later introduced to improve the performance and concurrency of the system.