diff options
Diffstat (limited to 'hw/9pfs/virtio-9p-coth.h')
| -rw-r--r-- | hw/9pfs/virtio-9p-coth.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/hw/9pfs/virtio-9p-coth.h b/hw/9pfs/virtio-9p-coth.h new file mode 100644 index 0000000000..8445d29bc4 --- /dev/null +++ b/hw/9pfs/virtio-9p-coth.h @@ -0,0 +1,58 @@ +/* + * Virtio 9p backend + * + * Copyright IBM, Corp. 2010 + * + * Authors: + * Harsh Prateek Bora <harsh@linux.vnet.ibm.com> + * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#ifndef _QEMU_VIRTIO_9P_COTH_H +#define _QEMU_VIRTIO_9P_COTH_H + +#include "qemu-thread.h" +#include "qemu-coroutine.h" +#include <glib.h> + +typedef struct V9fsThPool { + int rfd; + int wfd; + GThreadPool *pool; + GAsyncQueue *completed; +} V9fsThPool; + +/* + * we want to use bottom half because we want to make sure the below + * sequence of events. + * + * 1. Yield the coroutine in the QEMU thread. + * 2. Submit the coroutine to a worker thread. + * 3. Enter the coroutine in the worker thread. + * we cannot swap step 1 and 2, because that would imply worker thread + * can enter coroutine while step1 is still running + */ +#define v9fs_co_run_in_worker(code_block) \ + do { \ + QEMUBH *co_bh; \ + co_bh = qemu_bh_new(co_run_in_worker_bh, \ + qemu_coroutine_self()); \ + qemu_bh_schedule(co_bh); \ + /* \ + * yeild in qemu thread and re-enter back \ + * in glib worker thread \ + */ \ + qemu_coroutine_yield(); \ + qemu_bh_delete(co_bh); \ + code_block; \ + /* re-enter back to qemu thread */ \ + qemu_coroutine_yield(); \ + } while (0) + +extern void co_run_in_worker_bh(void *); +extern int v9fs_init_worker_threads(void); +#endif |