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/*
* 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 "virtio-9p.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);
extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *);
#endif
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