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/*
* Copyright (C) 2024 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FenceMonitor.h"
#if PLATFORM(GTK) || (PLATFORM(WPE) && ENABLE(WPE_PLATFORM))
#include <glib-unix.h>
#if PLATFORM(GTK)
#include <gtk/gtk.h>
#endif
namespace WebKit {
FenceMonitor::FenceMonitor(Function<void()>&& callback)
: m_callback(WTFMove(callback))
{
}
FenceMonitor::~FenceMonitor()
{
if (m_source)
g_source_destroy(m_source.get());
}
struct FenceSource {
static GSourceFuncs sourceFuncs;
GSource base;
gpointer tag;
};
GSourceFuncs FenceSource::sourceFuncs = {
nullptr, // prepare
nullptr, // check
// dispatch
[](GSource* base, GSourceFunc callback, gpointer userData) -> gboolean
{
auto& source = *reinterpret_cast<FenceSource*>(base);
g_source_remove_unix_fd(&source.base, source.tag);
source.tag = nullptr;
callback(userData);
return G_SOURCE_CONTINUE;
},
nullptr, // finalize
nullptr, // closure_callback
nullptr, // closure_marshall
};
void FenceMonitor::ensureSource()
{
if (LIKELY(m_source))
return;
m_source = adoptGRef(g_source_new(&FenceSource::sourceFuncs, sizeof(FenceSource)));
g_source_set_name(m_source.get(), "[WebKit] Fence monitor");
#if PLATFORM(GTK)
g_source_set_priority(m_source.get(), GDK_PRIORITY_REDRAW - 1);
#endif
g_source_set_callback(m_source.get(), [](gpointer userData) -> gboolean {
auto& monitor = *static_cast<FenceMonitor*>(userData);
monitor.m_fd = { };
monitor.m_callback();
return G_SOURCE_CONTINUE;
}, this, nullptr);
g_source_attach(m_source.get(), g_main_context_get_thread_default());
}
static bool isFileDescriptorReadable(int fd)
{
GPollFD pollFD = { fd, G_IO_IN, 0 };
if (!g_poll(&pollFD, 1, 0))
return FALSE;
return pollFD.revents & (G_IO_IN | G_IO_NVAL);
}
void FenceMonitor::addFileDescriptor(UnixFileDescriptor&& fd)
{
RELEASE_ASSERT(!m_fd);
if (!fd || isFileDescriptorReadable(fd.value())) {
m_callback();
return;
}
m_fd = WTFMove(fd);
ensureSource();
auto& source = *reinterpret_cast<FenceSource*>(m_source.get());
if (source.tag)
g_source_remove_unix_fd(&source.base, source.tag);
source.tag = g_source_add_unix_fd(&source.base, m_fd.value(), G_IO_IN);
}
} // namespace WebKit
#endif // PLATFORM(GTK) || (PLATFORM(WPE) && ENABLE(WPE_PLATFORM))
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