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Mark the two Regions used GraphicsBitmaps as explicitly shared.

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This fixes a goofy problem where forking a GUI process would cowify the
GraphicsBitmap for everyone making a hue confusing mess.
This commit is contained in:
Andreas Kling 2019-01-21 05:18:28 +01:00
parent d1af5c97ca
commit 76a2881793
Notes: sideshowbarker 2024-07-19 15:59:21 +09:00
3 changed files with 11 additions and 1 deletions
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7
Kernel/MemoryManager.cpp
View file

@ -563,11 +563,16 @@ RetainPtr<Region> Region::clone()
{
InterruptDisabler disabler;
if (is_readable && !is_writable) {
if (m_shared || (is_readable && !is_writable)) {
// Create a new region backed by the same VMObject.
return adopt(*new Region(linearAddress, size, m_vmo.copyRef(), m_offset_in_vmo, String(name), is_readable, is_writable));
}
dbgprintf("%s<%u> Region::clone(): cowing %s (L%x)\n",
current->name().characters(),
current->pid(),
name.characters(),
linearAddress.get());
// Set up a COW region. The parent (this) region becomes COW as well!
for (size_t i = 0; i < page_count(); ++i)
cow_map.set(i, true);

3
Kernel/MemoryManager.h
View file

@ -117,6 +117,8 @@ public:
const VMObject& vmo() const { return *m_vmo; }
VMObject& vmo() { return *m_vmo; }
void set_shared(bool shared) { m_shared = shared; }
RetainPtr<Region> clone();
bool contains(LinearAddress laddr) const
{
@ -156,6 +158,7 @@ public:
String name;
bool is_readable { true };
bool is_writable { true };
bool m_shared { false };
Bitmap cow_map;
};

2
SharedGraphics/GraphicsBitmap.cpp
View file

@ -21,12 +21,14 @@ GraphicsBitmap::GraphicsBitmap(Process& process, const Size& size)
size_t size_in_bytes = size.width() * size.height() * sizeof(RGBA32);
auto vmo = VMObject::create_anonymous(size_in_bytes);
m_client_region = process.allocate_region_with_vmo(LinearAddress(), size_in_bytes, vmo.copyRef(), 0, "GraphicsBitmap (client)", true, true);
m_client_region->set_shared(true);
m_client_region->commit(process);
{
auto& server = WSEventLoop::the().server_process();
InterruptDisabler disabler;
m_server_region = server.allocate_region_with_vmo(LinearAddress(), size_in_bytes, move(vmo), 0, "GraphicsBitmap (server)", true, true);
m_server_region->set_shared(true);
}
m_data = (RGBA32*)m_server_region->linearAddress.asPtr();
}