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Cache results of WMUtils::isRunningX11() and WMUtils::isRunningWayland()

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This commit is contained in:
Cameron Gutman 2021-02-07 11:03:53 -06:00
parent 6dab251055
commit 395eb5581c
1 changed files with 39 additions and 8 deletions
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35
app/wm.cpp
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@ -2,6 +2,8 @@
#include "utils.h"
#include <SDL.h>
#ifdef HAS_X11
#include <X11/Xlib.h>
#endif
@ -10,14 +12,30 @@
#include <wayland-client.h>
#endif
#define VALUE_SET 0x01
#define VALUE_TRUE 0x02
bool WMUtils::isRunningX11()
{
#ifdef HAS_X11
static SDL_atomic_t isRunningOnX11;
// If the value is not set yet, populate it now.
int val = SDL_AtomicGet(&isRunningOnX11);
if (!(val & VALUE_SET)) {
Display* display = XOpenDisplay(nullptr);
if (display != nullptr) {
XCloseDisplay(display);
return true;
}
// Populate the value to return and have for next time.
// This can race with another thread populating the same data,
// but that's no big deal.
val = VALUE_SET | ((display != nullptr) ? VALUE_TRUE : 0);
SDL_AtomicSet(&isRunningOnX11, val);
}
return !!(val & VALUE_TRUE);
#endif
return false;
@ -26,11 +44,24 @@ bool WMUtils::isRunningX11()
bool WMUtils::isRunningWayland()
{
#ifdef HAS_WAYLAND
static SDL_atomic_t isRunningOnWayland;
// If the value is not set yet, populate it now.
int val = SDL_AtomicGet(&isRunningOnWayland);
if (!(val & VALUE_SET)) {
struct wl_display* display = wl_display_connect(nullptr);
if (display != nullptr) {
wl_display_disconnect(display);
return true;
}
// Populate the value to return and have for next time.
// This can race with another thread populating the same data,
// but that's no big deal.
val = VALUE_SET | ((display != nullptr) ? VALUE_TRUE : 0);
SDL_AtomicSet(&isRunningOnWayland, val);
}
return !!(val & VALUE_TRUE);
#endif
return false;