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fix race condition reading OSD message in video driver

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This commit is contained in:
Brad Parker 2017-10-29 23:27:56 -04:00
parent ade710a331
commit fc856c76a8
3 changed files with 40 additions and 13 deletions
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11
gfx/video_driver.c
View File

@ -2380,9 +2380,18 @@ void video_driver_frame(const void *data, unsigned width,
video_driver_msg[0] = '\0';
if ( video_info.font_enable
&& runloop_msg_queue_pull((const char**)&msg)
&& runloop_msg_queue_pull((const char**)&msg)
&& msg)
{
#ifdef HAVE_THREADS
/* the msg pointer may point to data modified by another thread */
runloop_msg_queue_lock();
#endif
strlcpy(video_driver_msg, msg, sizeof(video_driver_msg));
#ifdef HAVE_THREADS
runloop_msg_queue_unlock();
#endif
}
video_driver_active = current_video->frame(
video_driver_data, data, width, height,

35
retroarch.c
View File

@ -48,7 +48,6 @@
#include <retro_miscellaneous.h>
#include <queues/message_queue.h>
#include <queues/task_queue.h>
#include <rthreads/rthreads.h>
#include <features/features_cpu.h>
#ifdef HAVE_CONFIG_H
@ -249,19 +248,31 @@ static retro_time_t frame_limit_last_time = 0.0;
extern bool input_driver_flushing_input;
#ifdef HAVE_THREADS
void runloop_msg_queue_lock(void)
{
slock_lock(_runloop_msg_queue_lock);
}
void runloop_msg_queue_unlock(void)
{
slock_unlock(_runloop_msg_queue_lock);
}
#endif
static void retroarch_msg_queue_deinit(void)
{
#ifdef HAVE_THREADS
runloop_msg_queue_lock();
#endif
if (!runloop_msg_queue)
return;
#ifdef HAVE_THREADS
slock_lock(_runloop_msg_queue_lock);
#endif
msg_queue_free(runloop_msg_queue);
#ifdef HAVE_THREADS
slock_unlock(_runloop_msg_queue_lock);
runloop_msg_queue_unlock();
slock_free(_runloop_msg_queue_lock);
_runloop_msg_queue_lock = NULL;
#endif
@ -2227,7 +2238,7 @@ void runloop_msg_queue_push(const char *msg,
runloop_ctx_msg_info_t msg_info;
#ifdef HAVE_THREADS
slock_lock(_runloop_msg_queue_lock);
runloop_msg_queue_lock();
#endif
if (flush)
@ -2253,7 +2264,7 @@ void runloop_msg_queue_push(const char *msg,
}
#ifdef HAVE_THREADS
slock_unlock(_runloop_msg_queue_lock);
runloop_msg_queue_unlock();
#endif
}
@ -2269,14 +2280,14 @@ void runloop_get_status(bool *is_paused, bool *is_idle,
bool runloop_msg_queue_pull(const char **ret)
{
#ifdef HAVE_THREADS
runloop_msg_queue_lock();
#endif
if (!ret)
return false;
#ifdef HAVE_THREADS
slock_lock(_runloop_msg_queue_lock);
#endif
*ret = msg_queue_pull(runloop_msg_queue);
#ifdef HAVE_THREADS
slock_unlock(_runloop_msg_queue_lock);
runloop_msg_queue_unlock();
#endif
return true;
}

7
retroarch.h
View File

@ -22,6 +22,7 @@
#include <stdlib.h>
#include <retro_common_api.h>
#include <retro_inline.h>
#include <boolean.h>
#include "core_type.h"
@ -349,6 +350,12 @@ bool retroarch_is_on_main_thread(void);
rarch_system_info_t *runloop_get_system_info(void);
#ifdef HAVE_THREADS
void runloop_msg_queue_lock(void);
void runloop_msg_queue_unlock(void);
#endif
RETRO_END_DECLS
#endif