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Kernel: Add a simple shared memory API for two processes only.

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And use this to implement shared bitmaps between WindowServer and clients.
This commit is contained in:
Andreas Kling 2019-02-16 12:13:43 +01:00
parent 4db78dabd3
commit 4ea28bf0a5
13 changed files with 240 additions and 48 deletions
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10
Kernel/Process.h
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@ -223,6 +223,10 @@ public:
int sys$accept(int sockfd, sockaddr*, socklen_t*);
int sys$connect(int sockfd, const sockaddr*, socklen_t);
int sys$create_shared_buffer(pid_t peer_pid, size_t, void** buffer);
void* sys$get_shared_buffer(int shared_buffer_id);
int sys$release_shared_buffer(int shared_buffer_id);
bool wait_for_connect(Socket&, int& error);
static void initialize();
@ -294,6 +298,8 @@ public:
Region* allocate_region_with_vmo(LinearAddress, size_t, RetainPtr<VMObject>&&, size_t offset_in_vmo, String&& name, bool is_readable, bool is_writable);
Region* allocate_file_backed_region(LinearAddress, size_t, RetainPtr<Inode>&&, String&& name, bool is_readable, bool is_writable);
Region* allocate_region(LinearAddress, size_t, String&& name, bool is_readable = true, bool is_writable = true, bool commit = true);
bool deallocate_region(Region& region);
private:
friend class MemoryManager;
@ -307,6 +313,7 @@ private:
int alloc_fd();
void set_default_signal_dispositions();
void disown_all_shared_buffers();
RetainPtr<PageDirectory> m_page_directory;
@ -365,9 +372,6 @@ private:
TTY* m_tty { nullptr };
Region* allocate_region(LinearAddress, size_t, String&& name, bool is_readable = true, bool is_writable = true, bool commit = true);
bool deallocate_region(Region& region);
Region* region_from_range(LinearAddress, size_t);
Vector<RetainPtr<Region>> m_regions;