mirror of https://gitee.com/openkylin/qemu.git
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
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/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
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* Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef _QEMU_VIRTIO_9P_COTH_H
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#define _QEMU_VIRTIO_9P_COTH_H
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#include "qemu-thread.h"
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#include "qemu-coroutine.h"
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#include <glib.h>
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typedef struct V9fsThPool {
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int rfd;
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int wfd;
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GThreadPool *pool;
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GAsyncQueue *completed;
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} V9fsThPool;
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/*
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* we want to use bottom half because we want to make sure the below
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* sequence of events.
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*
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* 1. Yield the coroutine in the QEMU thread.
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* 2. Submit the coroutine to a worker thread.
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* 3. Enter the coroutine in the worker thread.
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* we cannot swap step 1 and 2, because that would imply worker thread
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* can enter coroutine while step1 is still running
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*/
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#define v9fs_co_run_in_worker(code_block) \
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do { \
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QEMUBH *co_bh; \
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co_bh = qemu_bh_new(co_run_in_worker_bh, \
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qemu_coroutine_self()); \
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qemu_bh_schedule(co_bh); \
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/* \
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* yeild in qemu thread and re-enter back \
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* in glib worker thread \
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*/ \
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qemu_coroutine_yield(); \
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qemu_bh_delete(co_bh); \
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code_block; \
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/* re-enter back to qemu thread */ \
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qemu_coroutine_yield(); \
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} while (0)
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extern void co_run_in_worker_bh(void *);
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extern int v9fs_init_worker_threads(void);
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#endif
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