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wayland: Use timerfd for sub-msec poll() precision

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Like the change to ClutterFrameClock, this allows poll() timeouts below
1 msec by using a timerfd which will trigger using G_POLL_IN.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3636>
This commit is contained in:
Christian Hergert 2024-03-04 11:16:17 -08:00 committed by Marge Bot
parent 0810238d22
commit 1513dd4ef7
1 changed files with 68 additions and 0 deletions
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68
src/wayland/meta-wayland.c
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@ -21,11 +21,18 @@
#include "wayland/meta-wayland.h"
#include <glib/gstdio.h>
#include <sys/time.h>
#include <string.h>
#include <stdlib.h>
#include <wayland-server.h>
#ifdef HAVE_TIMERFD
# include <sys/timerfd.h>
# include <time.h>
#endif
#include "clutter/clutter.h"
#include "cogl/cogl-egl.h"
#include "compositor/meta-surface-actor-wayland.h"
@ -97,6 +104,11 @@ typedef struct
MetaWaylandCompositor *compositor;
ClutterStageView *stage_view;
#ifdef HAVE_TIMERFD
int tfd;
struct itimerspec tfd_spec;
#endif
} FrameCallbackSource;
static void meta_wayland_compositor_update_focus (MetaWaylandCompositor *compositor,
@ -192,6 +204,50 @@ emit_frame_callbacks_for_stage_view (MetaWaylandCompositor *compositor,
}
#ifdef HAVE_NATIVE_BACKEND
static gboolean
frame_callback_source_prepare (GSource *base,
int *timeout)
{
FrameCallbackSource *source = (FrameCallbackSource *)base;
*timeout = -1;
#ifdef HAVE_TIMERFD
if (source->tfd > -1)
{
int64_t ready_time = g_source_get_ready_time (base);
struct itimerspec tfd_spec;
tfd_spec.it_interval.tv_sec = 0;
tfd_spec.it_interval.tv_nsec = 0;
if (ready_time > -1)
{
tfd_spec.it_value.tv_sec = ready_time / G_USEC_PER_SEC;
tfd_spec.it_value.tv_nsec = (ready_time % G_USEC_PER_SEC) * 1000L;
}
else
{
tfd_spec.it_value.tv_sec = 0;
tfd_spec.it_value.tv_nsec = 0;
}
if (memcmp (&tfd_spec, &source->tfd_spec, sizeof tfd_spec) != 0)
{
source->tfd_spec = tfd_spec;
timerfd_settime (source->tfd,
TFD_TIMER_ABSTIME,
&source->tfd_spec,
NULL);
}
}
#endif
return FALSE;
}
static gboolean
frame_callback_source_dispatch (GSource *source,
GSourceFunc callback,
@ -214,9 +270,14 @@ frame_callback_source_finalize (GSource *source)
g_signal_handlers_disconnect_by_data (frame_callback_source->stage_view,
source);
#ifdef HAVE_TIMERFD
g_clear_fd (&frame_callback_source->tfd, NULL);
#endif
}
static GSourceFuncs frame_callback_source_funcs = {
.prepare = frame_callback_source_prepare,
.dispatch = frame_callback_source_dispatch,
.finalize = frame_callback_source_finalize,
};
@ -260,6 +321,13 @@ frame_callback_source_new (MetaWaylandCompositor *compositor,
G_CALLBACK (on_stage_view_destroy),
source);
#ifdef HAVE_TIMERFD
frame_callback_source->tfd = timerfd_create (CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
if (frame_callback_source->tfd > -1)
g_source_add_unix_fd (source, frame_callback_source->tfd, G_IO_IN);
#endif
return &frame_callback_source->source;
}