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LibGUI+Kernel: Add a GLock class (userspace mutex.)

Browse source 
It's basically a userspace port of the kernel's Lock class.
Added gettid() and donate() syscalls to support the timeslice donation
feature we already enjoyed in the kernel.
This commit is contained in:
Andreas Kling 2019-03-25 13:03:49 +01:00
parent 108b663618
commit 500df578fe
10 changed files with 176 additions and 12 deletions
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32
Applications/FileManager/DirectoryModel.cpp
View file

@ -8,12 +8,13 @@
#include <AK/StringBuilder.h>
#include <SharedGraphics/GraphicsBitmap.h>
#include <SharedGraphics/Painter.h>
#include <LibGUI/GLock.h>
static HashMap<String, RetainPtr<GraphicsBitmap>>& thumbnail_cache()
static GLockable<HashMap<String, RetainPtr<GraphicsBitmap>>>& thumbnail_cache()
{
static HashMap<String, RetainPtr<GraphicsBitmap>>* s_map;
static GLockable<HashMap<String, RetainPtr<GraphicsBitmap>>>* s_map;
if (!s_map)
s_map = new HashMap<String, RetainPtr<GraphicsBitmap>>();
s_map = new GLockable<HashMap<String, RetainPtr<GraphicsBitmap>>>();
return *s_map;
}
@ -23,11 +24,16 @@ int thumbnail_thread(void* model_ptr)
for (;;) {
sleep(1);
Vector<String> to_generate;
for (auto& it : thumbnail_cache()) {
if (it.value)
continue;
to_generate.append(it.key);
{
LOCKER(thumbnail_cache().lock());
for (auto& it : thumbnail_cache().resource()) {
if (it.value)
continue;
to_generate.append(it.key);
}
}
if (to_generate.is_empty())
continue;
for (int i = 0; i < to_generate.size(); ++i) {
auto& path = to_generate[i];
auto png_bitmap = GraphicsBitmap::load_from_file(path);
@ -36,7 +42,10 @@ int thumbnail_thread(void* model_ptr)
auto thumbnail = GraphicsBitmap::create(png_bitmap->format(), { 32, 32 });
Painter painter(*thumbnail);
painter.draw_scaled_bitmap(thumbnail->rect(), *png_bitmap, png_bitmap->rect());
thumbnail_cache().set(path, move(thumbnail));
{
LOCKER(thumbnail_cache().lock());
thumbnail_cache().resource().set(path, move(thumbnail));
}
if (model.on_thumbnail_progress)
model.on_thumbnail_progress(i + 1, to_generate.size());
model.did_update();
@ -121,11 +130,12 @@ GIcon DirectoryModel::icon_for(const Entry& entry) const
if (entry.name.to_lowercase().ends_with(".png")) {
if (!entry.thumbnail) {
auto path = entry.full_path(*this);
auto it = thumbnail_cache().find(path);
if (it != thumbnail_cache().end()) {
LOCKER(thumbnail_cache().lock());
auto it = thumbnail_cache().resource().find(path);
if (it != thumbnail_cache().resource().end()) {
entry.thumbnail = (*it).value.copy_ref();
} else {
thumbnail_cache().set(path, nullptr);
thumbnail_cache().resource().set(path, nullptr);
}
}
if (!entry.thumbnail)