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westeros backend : ensure paired execution of prepare and check callbacks #58

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westeros backend : ensure paired execution of prepare and check callbacks #58

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16 changes: 14 additions & 2 deletions src/westeros/renderer-backend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,7 @@ class EventSource {
GSource source;
GPollFD pfd;
struct wl_display* display;
bool prepared;
};

GSourceFuncs EventSource::sourceFuncs = {
Expand All @@ -126,6 +127,9 @@ GSourceFuncs EventSource::sourceFuncs = {
auto* source = reinterpret_cast<EventSource*>(base);
struct wl_display* display = source->display;

if (source->prepared)
return FALSE;

*timeout = -1;

while (wl_display_prepare_read(display) != 0) {
Expand All @@ -136,6 +140,7 @@ GSourceFuncs EventSource::sourceFuncs = {
}
wl_display_flush(display);

source->prepared = true;
return FALSE;
},
// check
Expand All @@ -144,14 +149,19 @@ GSourceFuncs EventSource::sourceFuncs = {
auto* source = reinterpret_cast<EventSource*>(base);
struct wl_display* display = source->display;

if (!source->prepared)
return FALSE;

if (source->pfd.revents & G_IO_IN) {
if (wl_display_read_events(display) < 0) {
DEBUG_PRINT("Wayland::Display: error in wayland read\n");
return FALSE;
}
source->prepared = false;
return TRUE;
} else {
wl_display_cancel_read(display);
source->prepared = false;
return FALSE;
}
},
Expand Down Expand Up @@ -213,8 +223,7 @@ Backend::Backend()

Backend::~Backend()
{
if (m_eventSource)
g_source_destroy(m_eventSource);
invalidate();

if (m_compositor)
wl_compositor_destroy(m_compositor);
Expand All @@ -227,6 +236,8 @@ Backend::~Backend()
void Backend::invalidate()
{
if (m_eventSource) {
if (m_eventSource->prepared && m_display)
wl_display_cancel_read(m_display);
g_source_destroy(m_eventSource);
m_eventSource = nullptr;
}
Expand All @@ -240,6 +251,7 @@ void Backend::initialize()
m_eventSource = g_source_new(&EventSource::sourceFuncs, sizeof(EventSource));
auto& source = *reinterpret_cast<EventSource*>(m_eventSource);
source.display = m_display;
source.prepared = false;

source.pfd.fd = wl_display_get_fd(m_display);
source.pfd.events = G_IO_IN | G_IO_ERR | G_IO_HUP;
Expand Down