diff --git a/src/core/hle/kernel/client_session.cpp b/src/core/hle/kernel/client_session.cpp index fef97af1f..78a64d105 100644 --- a/src/core/hle/kernel/client_session.cpp +++ b/src/core/hle/kernel/client_session.cpp @@ -39,7 +39,7 @@ ResultCode ClientSession::SendSyncRequest() { return ERR_SESSION_CLOSED_BY_REMOTE; // Signal the server session that new data is available - return server->HandleSyncRequest(); + return server->HandleSyncRequest(GetCurrentThread()); } } // namespace diff --git a/src/core/hle/kernel/server_session.cpp b/src/core/hle/kernel/server_session.cpp index 2dc709bc9..970eac5fe 100644 --- a/src/core/hle/kernel/server_session.cpp +++ b/src/core/hle/kernel/server_session.cpp @@ -32,22 +32,29 @@ ResultVal> ServerSession::Create(std::string name) { SharedPtr server_session(new ServerSession); server_session->name = std::move(name); - server_session->signaled = false; server_session->parent = nullptr; return MakeResult(std::move(server_session)); } bool ServerSession::ShouldWait(Thread* thread) const { - return !signaled; + // Closed sessions should never wait, an error will be returned from svcReplyAndReceive. + if (parent->client == nullptr) + return false; + // Wait if we have no pending requests, or if we're currently handling a request. + return pending_requesting_threads.empty() || currently_handling != nullptr; } void ServerSession::Acquire(Thread* thread) { ASSERT_MSG(!ShouldWait(thread), "object unavailable!"); - signaled = false; + // We are now handling a request, pop it from the stack. + // TODO(Subv): What happens if the client endpoint is closed before any requests are made? + ASSERT(!pending_requesting_threads.empty()); + currently_handling = pending_requesting_threads.back(); + pending_requesting_threads.pop_back(); } -ResultCode ServerSession::HandleSyncRequest() { +ResultCode ServerSession::HandleSyncRequest(SharedPtr thread) { // The ServerSession received a sync request, this means that there's new data available // from its ClientSession, so wake up any threads that may be waiting on a svcReplyAndReceive or // similar. @@ -60,11 +67,14 @@ ResultCode ServerSession::HandleSyncRequest() { return result; hle_handler->HandleSyncRequest(SharedPtr(this)); // TODO(Subv): Translate the response command buffer. + } else { + // Add the thread to the list of threads that have issued a sync request with this + // server. + pending_requesting_threads.push_back(std::move(thread)); } // If this ServerSession does not have an HLE implementation, just wake up the threads waiting // on it. - signaled = true; WakeupAllWaitingThreads(); return RESULT_SUCCESS; } @@ -90,4 +100,4 @@ ResultCode TranslateHLERequest(ServerSession* server_session) { // TODO(Subv): Implement this function once multiple concurrent processes are supported. return RESULT_SUCCESS; } -} +} // namespace Kernel diff --git a/src/core/hle/kernel/server_session.h b/src/core/hle/kernel/server_session.h index 5365605da..f4360ddf3 100644 --- a/src/core/hle/kernel/server_session.h +++ b/src/core/hle/kernel/server_session.h @@ -67,20 +67,30 @@ public: /** * Handle a sync request from the emulated application. + * @param thread Thread that initiated the request. * @returns ResultCode from the operation. */ - ResultCode HandleSyncRequest(); + ResultCode HandleSyncRequest(SharedPtr thread); bool ShouldWait(Thread* thread) const override; void Acquire(Thread* thread) override; std::string name; ///< The name of this session (optional) - bool signaled; ///< Whether there's new data available to this ServerSession std::shared_ptr parent; ///< The parent session, which links to the client endpoint. std::shared_ptr hle_handler; ///< This session's HLE request handler (optional) + /// List of threads that are pending a response after a sync request. This list is processed in + /// a LIFO manner, thus, the last request will be dispatched first. + /// TODO(Subv): Verify if this is indeed processed in LIFO using a hardware test. + std::vector> pending_requesting_threads; + + /// Thread whose request is currently being handled. A request is considered "handled" when a + /// response is sent via svcReplyAndReceive. + /// TODO(Subv): Find a better name for this. + SharedPtr currently_handling; + private: ServerSession(); ~ServerSession() override;