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backend: wait for session to become active

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This commit is contained in:
muradm 2021-09-07 21:09:14 +03:00 committed by Simon Ser
parent 0c8fba1a2f
commit 35f0a0d570
1 changed files with 50 additions and 2 deletions
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52
backend/backend.c
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@ -33,6 +33,8 @@
#include <wlr/backend/x11.h>
#endif
#define WAIT_SESSION_TIMEOUT 10000 // ms
void wlr_backend_init(struct wlr_backend *backend,
const struct wlr_backend_impl *impl) {
assert(backend);
@ -106,6 +108,52 @@ struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
return NULL;
}
static uint64_t get_current_time_ms(void) {
struct timespec ts = {0};
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
static struct wlr_session *session_create_and_wait(struct wl_display *disp) {
struct wlr_session *session = wlr_session_create(disp);
if (!session) {
wlr_log(WLR_ERROR, "Failed to start a session");
return NULL;
}
if (!session->active) {
wlr_log(WLR_INFO, "Waiting for a session to become active");
uint64_t started_at = get_current_time_ms();
uint64_t timeout = WAIT_SESSION_TIMEOUT;
struct wl_event_loop *event_loop =
wl_display_get_event_loop(session->display);
while (!session->active) {
int ret = wl_event_loop_dispatch(event_loop, (int)timeout);
if (ret < 0) {
wlr_log_errno(WLR_ERROR, "Failed to wait for session active: "
"wl_event_loop_dispatch failed");
return NULL;
}
uint64_t now = get_current_time_ms();
if (now >= started_at + WAIT_SESSION_TIMEOUT) {
break;
}
timeout = started_at + WAIT_SESSION_TIMEOUT - now;
}
if (!session->active) {
wlr_log(WLR_ERROR, "Timeout waiting session to become active");
return NULL;
}
}
return session;
}
clockid_t wlr_backend_get_presentation_clock(struct wlr_backend *backend) {
if (backend->impl->get_presentation_clock) {
return backend->impl->get_presentation_clock(backend);
@ -269,7 +317,7 @@ static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
// DRM and libinput need a session
if (!*session) {
*session = wlr_session_create(display);
*session = session_create_and_wait(display);
if (!*session) {
wlr_log(WLR_ERROR, "failed to start a session");
return NULL;
@ -368,7 +416,7 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
#endif
// Attempt DRM+libinput
multi->session = wlr_session_create(display);
multi->session = session_create_and_wait(display);
if (!multi->session) {
wlr_log(WLR_ERROR, "Failed to start a DRM session");
wlr_backend_destroy(backend);