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Boost application performance using asynchronous I/O-ref

发布时间：2021-01-29 10:10:05 所属栏目：站长百科 来源：网络整理
导读：副标题#e# Linux asynchronous I/O is a relatively recent addition to the Linux kernel. It's a standard feature of the 2.6 kernel,but you can find patches for 2.4. The basic idea behind AIO is to allow a process to initiate a number of I/O

The AIO interface API is quite simple,but it provides the necessary functions for data transfer with a couple of different notification models. Table 1 shows the AIO interface functions,which are further explained later in this section.

API function aio_readaio_erroraio_returnaio_writeaio_suspendaio_cancellio_listio Each of these API functions uses the?aiocb?structure for initiating or checking. This structure has a number of elements,but Listing 1 shows only the ones that you'll need to (or can) use.

int aio_fildes; // File Descriptor
int aio_lio_opcode; // Valid only for lio_listio (r/w/nop)
volatile void *aio_buf; // Data Buffer
size_t aio_nbytes; // Number of Bytes in Data Buffer
struct sigevent aio_sigevent; // Notification Structure

/ Internal fields /
...

};

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