sockets: avoid locking around socket session calls

src/core/hle/service/service.h

@@ -79,8 +79,8 @@ protected:
     using HandlerFnP = void (Self::*)(HLERequestContext&);
 
     /// Used to gain exclusive access to the service members, e.g. from CoreTiming thread.
-    [[nodiscard]] std::scoped_lock<std::mutex> LockService() {
-        return std::scoped_lock{lock_service};
+    [[nodiscard]] virtual std::unique_lock<std::mutex> LockService() {
+        return std::unique_lock{lock_service};
     }
 
     /// System context that the service operates under.

src/core/hle/service/sockets/bsd.cpp

@@ -1029,6 +1029,11 @@ BSD::~BSD() {
     }
 }
 
+std::unique_lock<std::mutex> BSD::LockService() {
+    // Do not lock socket IClient instances.
+    return {};
+}
+
 BSDCFG::BSDCFG(Core::System& system_) : ServiceFramework{system_, "bsdcfg"} {
     // clang-format off
     static const FunctionInfo functions[] = {

src/core/hle/service/sockets/bsd.h

@@ -186,6 +186,9 @@ private:
 
     // Callback identifier for the OnProxyPacketReceived event.
     Network::RoomMember::CallbackHandle<Network::ProxyPacket> proxy_packet_received;
+
+protected:
+    virtual std::unique_lock<std::mutex> LockService() override;
 };
 
 class BSDCFG final : public ServiceFramework<BSDCFG> {