projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| a76bab49 AL |
1 | /* |
| 2 | * QEMU aio implementation | |
| 3 | * | |
| 4 | * Copyright IBM, Corp. 2008 | |
| 5 | * | |
| 6 | * Authors: | |
| 7 | * Anthony Liguori <aliguori@us.ibm.com> | |
| 8 | * | |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
| 10 | * the COPYING file in the top-level directory. | |
| 11 | * | |
| 12 | */ | |
| 13 | ||
| 14 | #ifndef QEMU_AIO_H | |
| 15 | #define QEMU_AIO_H | |
| 16 | ||
| 17 | #include "qemu-common.h" | |
| 18 | #include "qemu-char.h" | |
| 19 | ||
| 20 | /* Returns 1 if there are still outstanding AIO requests; 0 otherwise */ | |
| 21 | typedef int (AioFlushHandler)(void *opaque); | |
| 22 | ||
| 23 | /* Flush any pending AIO operation. This function will block until all | |
| 24 | * outstanding AIO operations have been completed or cancelled. */ | |
| 25 | void qemu_aio_flush(void); | |
| 26 | ||
| 27 | /* Wait for a single AIO completion to occur. This function will until a | |
| 28 | * single AIO opeartion has completed. It is intended to be used as a looping | |
| 29 | * primative when simulating synchronous IO based on asynchronous IO. */ | |
| 30 | void qemu_aio_wait(void); | |
| 31 | ||
| 32 | /* Register a file descriptor and associated callbacks. Behaves very similarly | |
| 33 | * to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will | |
| 34 | * be invoked when using either qemu_aio_wait() or qemu_aio_flush(). | |
| 35 | * | |
| 36 | * Code that invokes AIO completion functions should rely on this function | |
| 37 | * instead of qemu_set_fd_handler[2]. | |
| 38 | */ | |
| 39 | int qemu_aio_set_fd_handler(int fd, | |
| 40 | IOHandler *io_read, | |
| 41 | IOHandler *io_write, | |
| 42 | AioFlushHandler *io_flush, | |
| 43 | void *opaque); | |
| 44 | ||
| 45 | #endif |