stream: make mp_input_check_interrupt thread-safe

The interrupt callback will can be called from another thread if the
cache is enabled, and the stream disconnects. Then stream_reconnect()
will call this function from within the cache thread.

mp_input_check_interrupt() is not thread-safe due to read_events() not
being thread-safe. It will call input callbacks added with
mp_input_add_fd() - these callbacks lead to code not protected by locks,
such as reading X11 events.

Solve this by adding a stupid hack, which checks whether the calling
thread is the main playback thread (i.e. calling the input callbacks
will be safe). We can remove this hack later, but it requires at least
moving the VO to its own thread first.

1 files changed, 2 insertions, 0 deletions

diff --git a/input/input.h b/input/input.h
index 8f46b0fd9a..b774462aab 100644
--- a/input/input.h
+++ b/input/input.h
@@ -219,6 +219,8 @@ bool mp_input_use_alt_gr(struct input_ctx *ictx);
 void mp_input_run_cmd(struct input_ctx *ictx, int def_flags, const char **cmd,
                       const char *location);
 
+void mp_input_set_main_thread(struct input_ctx *ictx);
+
 extern int async_quit_request;
 
 #endif /* MPLAYER_INPUT_H */