Kernel: Added ClientPort and ServerPort classes.

This is part of an ongoing effort to implement support for multiple processes.

src/core/CMakeLists.txt

@@ -29,6 +29,7 @@ set(SRCS
             hle/applets/mii_selector.cpp
             hle/applets/swkbd.cpp
             hle/kernel/address_arbiter.cpp
+            hle/kernel/client_port.cpp
             hle/kernel/event.cpp
             hle/kernel/kernel.cpp
             hle/kernel/memory.cpp
@@ -36,6 +37,7 @@ set(SRCS
             hle/kernel/process.cpp
             hle/kernel/resource_limit.cpp
             hle/kernel/semaphore.cpp
+            hle/kernel/server_port.cpp
             hle/kernel/session.cpp
             hle/kernel/shared_memory.cpp
             hle/kernel/thread.cpp
@@ -164,6 +166,7 @@ set(HEADERS
             hle/applets/mii_selector.h
             hle/applets/swkbd.h
             hle/kernel/address_arbiter.h
+            hle/kernel/client_port.h
             hle/kernel/event.h
             hle/kernel/kernel.h
             hle/kernel/memory.h
@@ -171,6 +174,7 @@ set(HEADERS
             hle/kernel/process.h
             hle/kernel/resource_limit.h
             hle/kernel/semaphore.h
+            hle/kernel/server_port.h
             hle/kernel/session.h
             hle/kernel/shared_memory.h
             hle/kernel/thread.h

src/core/hle/kernel/client_port.cpp

@@ -0,0 +1,16 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+
+#include "core/hle/kernel/client_port.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/server_port.h"
+
+namespace Kernel {
+
+ClientPort::ClientPort() {}
+ClientPort::~ClientPort() {}
+
+} // namespace

src/core/hle/kernel/client_port.h

@@ -0,0 +1,34 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+#include "common/common_types.h"
+
+#include "core/hle/kernel/kernel.h"
+
+namespace Kernel {
+
+class ClientPort : public Object {
+public:
+    friend class ServerPort;
+    std::string GetTypeName() const override { return "ClientPort"; }
+    std::string GetName() const override { return name; }
+
+    static const HandleType HANDLE_TYPE = HandleType::ClientPort;
+    HandleType GetHandleType() const override { return HANDLE_TYPE; }
+
+    SharedPtr<ServerPort> server_port;          ///< ServerPort associated with this client port.
+    u32 max_sessions;                           ///< Maximum number of simultaneous sessions the port can have
+    u32 active_sessions;                        ///< Number of currently open sessions to this port
+    std::string name;                           ///< Name of client port (optional)
+
+protected:
+    ClientPort();
+    ~ClientPort() override;
+};
+
+} // namespace

src/core/hle/kernel/kernel.h

@@ -35,7 +35,7 @@ enum KernelHandle : Handle {
 
 enum class HandleType : u32 {
     Unknown         = 0,
-    Port            = 1,
+    ServerPort      = 1,
     Session         = 2,
     Event           = 3,
     Mutex           = 4,
@@ -48,6 +48,7 @@ enum class HandleType : u32 {
     Timer           = 11,
     ResourceLimit   = 12,
     CodeSet         = 13,
+    ClientPort      = 14,
 };
 
 enum {
@@ -72,6 +73,7 @@ public:
     bool IsWaitable() const {
         switch (GetHandleType()) {
         case HandleType::Session:
+        case HandleType::ServerPort:
         case HandleType::Event:
         case HandleType::Mutex:
         case HandleType::Thread:
@@ -80,13 +82,13 @@ public:
             return true;
 
         case HandleType::Unknown:
-        case HandleType::Port:
         case HandleType::SharedMemory:
         case HandleType::Redirection:
         case HandleType::Process:
         case HandleType::AddressArbiter:
         case HandleType::ResourceLimit:
         case HandleType::CodeSet:
+        case HandleType::ClientPort:
             return false;
         }
     }

src/core/hle/kernel/server_port.cpp

@@ -0,0 +1,38 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/server_port.h"
+#include "core/hle/kernel/thread.h"
+
+namespace Kernel {
+
+ServerPort::ServerPort() {}
+ServerPort::~ServerPort() {}
+
+bool ServerPort::ShouldWait() {
+    // If there are no pending sessions, we wait until a new one is added.
+    return pending_sessions.size() == 0;
+}
+
+void ServerPort::Acquire() {
+    ASSERT_MSG(!ShouldWait(), "object unavailable!");
+}
+
+std::tuple<SharedPtr<ServerPort>, SharedPtr<ClientPort>> ServerPort::CreatePortPair(u32 max_sessions, std::string name) {
+    SharedPtr<ServerPort> server_port(new ServerPort);
+    SharedPtr<ClientPort> client_port(new ClientPort);
+
+    server_port->name = name + "_Server";
+    client_port->name = name + "_Client";
+    client_port->server_port = server_port;
+    client_port->max_sessions = max_sessions;
+    client_port->active_sessions = 0;
+
+    return std::make_tuple(std::move(server_port), std::move(client_port));
+}
+
+} // namespace

src/core/hle/kernel/server_port.h

@@ -0,0 +1,43 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+#include "common/common_types.h"
+
+#include "core/hle/kernel/kernel.h"
+
+namespace Kernel {
+
+class ServerPort final : public WaitObject {
+public:
+    /**
+     * Creates a pair of a ServerPort and an associated ClientPort.
+     * @param max_sessions Maximum number of sessions to the port
+     * @param name Optional name of the ports
+     * @return The created port tuple
+     */
+    static std::tuple<SharedPtr<ServerPort>, SharedPtr<ClientPort>> CreatePortPair(u32 max_sessions, std::string name = "UnknownPort");
+
+    std::string GetTypeName() const override { return "ServerPort"; }
+    std::string GetName() const override { return name; }
+
+    static const HandleType HANDLE_TYPE = HandleType::ServerPort;
+    HandleType GetHandleType() const override { return HANDLE_TYPE; }
+
+    std::string name;                           ///< Name of port (optional)
+
+    std::vector<SharedPtr<WaitObject>> pending_sessions; ///< ServerSessions waiting to be accepted by the port
+
+    bool ShouldWait() override;
+    void Acquire() override;
+
+private:
+    ServerPort();
+    ~ServerPort() override;
+};
+
+} // namespace