Boost application performance using asynchronous I/O-ref

For performance,the completion handler is an ideal spot to continue the I/O by requesting the next asynchronous transfer. In this way,when completion of one transfer has completed,you immediately start the next.

An alternative notification mechanism is the system callback. Instead of raising a signal for notification,this mechanism calls a function in user-space for notification. You initialize the?aiocb?reference into the?sigevent?structure to uniquely identify the particular request being completed; see Listing 6.

...

/ Set up the AIO request /
bzero( (char *)&my_aiocb,sizeof(struct aiocb) );
my_aiocb.aio_fildes = fd;
my_aiocb.aio_buf = malloc(BUF_SIZE+1);
my_aiocb.aio_nbytes = BUF_SIZE;
my_aiocb.aio_offset = next_offset;

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