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xwm: Try a non-blocking write before setting up an fd watch for property data

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Typically we can write it immediately without blocking, so save the overhead
of setting up an fd watch and writing the data in a callback.  For the
case where the immediate write doesn't write all data, we fallback and
set up the fd watch as usual.

This patch also consolidates setting up the async write a bit.
This commit is contained in:
Kristian Høgsberg 2013-09-04 22:12:28 -07:00
parent f9cb3b17d5
commit 3f7fcf83f6
1 changed files with 24 additions and 19 deletions
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43
src/xwayland/selection.c
View File

@ -30,7 +30,7 @@
#include "xwayland.h"
static int
weston_wm_write_property(int fd, uint32_t mask, void *data)
writable_callback(int fd, uint32_t mask, void *data)
{
struct weston_wm *wm = data;
unsigned char *property;
@ -43,7 +43,9 @@ weston_wm_write_property(int fd, uint32_t mask, void *data)
len = write(fd, property + wm->property_start, remainder);
if (len == -1) {
free(wm->property_reply);
wl_event_source_remove(wm->property_source);
wm->property_reply = NULL;
if (wm->property_source)
wl_event_source_remove(wm->property_source);
close(fd);
weston_log("write error to target fd: %m\n");
return 1;
@ -56,7 +58,9 @@ weston_wm_write_property(int fd, uint32_t mask, void *data)
wm->property_start += len;
if (len == remainder) {
free(wm->property_reply);
wl_event_source_remove(wm->property_source);
wm->property_reply = NULL;
if (wm->property_source)
wl_event_source_remove(wm->property_source);
if (wm->incr) {
xcb_delete_property(wm->conn,
@ -71,6 +75,21 @@ weston_wm_write_property(int fd, uint32_t mask, void *data)
return 1;
}
static void
weston_wm_write_property(struct weston_wm *wm, xcb_get_property_reply_t *reply)
{
wm->property_start = 0;
wm->property_reply = reply;
writable_callback(wm->data_source_fd, WL_EVENT_WRITABLE, wm);
if (wm->property_reply)
wm->property_source =
wl_event_loop_add_fd(wm->server->loop,
wm->data_source_fd,
WL_EVENT_WRITABLE,
writable_callback, wm);
}
static void
weston_wm_get_incr_chunk(struct weston_wm *wm)
{
@ -90,14 +109,7 @@ weston_wm_get_incr_chunk(struct weston_wm *wm)
dump_property(wm, wm->atom.wl_selection, reply);
if (xcb_get_property_value_length(reply) > 0) {
wm->property_start = 0;
wm->property_source =
wl_event_loop_add_fd(wm->server->loop,
wm->data_source_fd,
WL_EVENT_WRITABLE,
weston_wm_write_property,
wm);
wm->property_reply = reply;
weston_wm_write_property(wm, reply);
} else {
weston_log("transfer complete\n");
close(wm->data_source_fd);
@ -223,14 +235,7 @@ weston_wm_get_selection_data(struct weston_wm *wm)
} else {
dump_property(wm, wm->atom.wl_selection, reply);
wm->incr = 0;
wm->property_start = 0;
wm->property_source =
wl_event_loop_add_fd(wm->server->loop,
wm->data_source_fd,
WL_EVENT_WRITABLE,
weston_wm_write_property,
wm);
wm->property_reply = reply;
weston_wm_write_property(wm, reply);
}
}