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39c0564e VJJ |
1 | /* |
2 | * Virtio 9p backend | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Harsh Prateek Bora <harsh@linux.vnet.ibm.com> | |
8 | * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
11 | * the COPYING file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef _QEMU_VIRTIO_9P_COTH_H | |
16 | #define _QEMU_VIRTIO_9P_COTH_H | |
17 | ||
18 | #include "qemu-thread.h" | |
19 | #include "qemu-coroutine.h" | |
ff06030f | 20 | #include "virtio-9p.h" |
39c0564e VJJ |
21 | #include <glib.h> |
22 | ||
23 | typedef struct V9fsThPool { | |
24 | int rfd; | |
25 | int wfd; | |
26 | GThreadPool *pool; | |
27 | GAsyncQueue *completed; | |
28 | } V9fsThPool; | |
29 | ||
30 | /* | |
31 | * we want to use bottom half because we want to make sure the below | |
32 | * sequence of events. | |
33 | * | |
34 | * 1. Yield the coroutine in the QEMU thread. | |
35 | * 2. Submit the coroutine to a worker thread. | |
36 | * 3. Enter the coroutine in the worker thread. | |
37 | * we cannot swap step 1 and 2, because that would imply worker thread | |
38 | * can enter coroutine while step1 is still running | |
39 | */ | |
40 | #define v9fs_co_run_in_worker(code_block) \ | |
41 | do { \ | |
42 | QEMUBH *co_bh; \ | |
43 | co_bh = qemu_bh_new(co_run_in_worker_bh, \ | |
44 | qemu_coroutine_self()); \ | |
45 | qemu_bh_schedule(co_bh); \ | |
46 | /* \ | |
47 | * yeild in qemu thread and re-enter back \ | |
48 | * in glib worker thread \ | |
49 | */ \ | |
50 | qemu_coroutine_yield(); \ | |
51 | qemu_bh_delete(co_bh); \ | |
52 | code_block; \ | |
53 | /* re-enter back to qemu thread */ \ | |
54 | qemu_coroutine_yield(); \ | |
55 | } while (0) | |
56 | ||
57 | extern void co_run_in_worker_bh(void *); | |
58 | extern int v9fs_init_worker_threads(void); | |
86e42d74 | 59 | extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *); |
dcb9dbe3 AK |
60 | extern int v9fs_co_readdir(V9fsState *, V9fsFidState *, |
61 | struct dirent **); | |
62 | extern off_t v9fs_co_telldir(V9fsState *, V9fsFidState *); | |
63 | extern void v9fs_co_seekdir(V9fsState *, V9fsFidState *, off_t); | |
64 | extern void v9fs_co_rewinddir(V9fsState *, V9fsFidState *); | |
94840ff9 | 65 | extern int v9fs_co_statfs(V9fsState *, V9fsString *, struct statfs *); |
172198d4 | 66 | extern int v9fs_co_lstat(V9fsState *, V9fsString *, struct stat *); |
39c0564e | 67 | #endif |