mirror of
https://github.com/qemu/qemu.git
synced 2024-11-29 14:53:35 +08:00
175b2a6e4b
The threaded VNC servers messed up with QEMU fd handlers without any kind of locking, and that can cause some nasty race conditions. Using qemu_mutex_lock_iothread() won't work because vnc_dpy_cpy(), which will wait for the current job queue to finish, can be called with the iothread lock held. Instead, we now store the data in a temporary buffer, and use a bottom half to notify the main thread that new data is available. vnc_[un]lock_ouput() is still needed to access VncState members like abort, csock or jobs_buffer. Signed-off-by: Corentin Chary <corentin.chary@gmail.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
|
|
* QEMU VNC display driver
|
|
*
|
|
* From libvncserver/rfb/rfbproto.h
|
|
* Copyright (C) 2005 Rohit Kumar, Johannes E. Schindelin
|
|
* Copyright (C) 2000-2002 Constantin Kaplinsky. All Rights Reserved.
|
|
* Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
|
|
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
|
|
*
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef VNC_JOBS_H
|
|
#define VNC_JOBS_H
|
|
|
|
/* Jobs */
|
|
VncJob *vnc_job_new(VncState *vs);
|
|
int vnc_job_add_rect(VncJob *job, int x, int y, int w, int h);
|
|
void vnc_job_push(VncJob *job);
|
|
bool vnc_has_job(VncState *vs);
|
|
void vnc_jobs_clear(VncState *vs);
|
|
void vnc_jobs_join(VncState *vs);
|
|
|
|
#ifdef CONFIG_VNC_THREAD
|
|
|
|
void vnc_jobs_consume_buffer(VncState *vs);
|
|
void vnc_start_worker_thread(void);
|
|
bool vnc_worker_thread_running(void);
|
|
void vnc_stop_worker_thread(void);
|
|
|
|
#endif /* CONFIG_VNC_THREAD */
|
|
|
|
/* Locks */
|
|
static inline int vnc_trylock_display(VncDisplay *vd)
|
|
{
|
|
#ifdef CONFIG_VNC_THREAD
|
|
return qemu_mutex_trylock(&vd->mutex);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static inline void vnc_lock_display(VncDisplay *vd)
|
|
{
|
|
#ifdef CONFIG_VNC_THREAD
|
|
qemu_mutex_lock(&vd->mutex);
|
|
#endif
|
|
}
|
|
|
|
static inline void vnc_unlock_display(VncDisplay *vd)
|
|
{
|
|
#ifdef CONFIG_VNC_THREAD
|
|
qemu_mutex_unlock(&vd->mutex);
|
|
#endif
|
|
}
|
|
|
|
static inline void vnc_lock_output(VncState *vs)
|
|
{
|
|
#ifdef CONFIG_VNC_THREAD
|
|
qemu_mutex_lock(&vs->output_mutex);
|
|
#endif
|
|
}
|
|
|
|
static inline void vnc_unlock_output(VncState *vs)
|
|
{
|
|
#ifdef CONFIG_VNC_THREAD
|
|
qemu_mutex_unlock(&vs->output_mutex);
|
|
#endif
|
|
}
|
|
|
|
#endif /* VNC_JOBS_H */
|