Kernel: Make WaitObjects share ownership of Threads waiting on them

During normal operation, a thread waiting on an WaitObject and the
object hold mutual references to each other for the duration of the
wait.

If a process is forcefully terminated (The CTR kernel has a SVC to do
this, TerminateProcess, though no equivalent exists for threads.) its
threads would also be stopped and destroyed, leaving dangling pointers
in the WaitObjects.

The solution is to simply have the Thread remove itself from WaitObjects
when it is stopped. The vector of Threads in WaitObject has also been
changed to hold SharedPtrs, just in case. (Better to have a reference
cycle than a crash.)

1 files changed, 5 insertions, 5 deletions

diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index bf5b47a61..4d8e388b6 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -136,25 +136,26 @@ public:
      * Add a thread to wait on this object
      * @param thread Pointer to thread to add
      */
-    void AddWaitingThread(Thread* thread);
+    void AddWaitingThread(SharedPtr<Thread> thread);
 
     /**
      * Removes a thread from waiting on this object (e.g. if it was resumed already)
      * @param thread Pointer to thread to remove
      */
-    void RemoveWaitingThread(Thread* thead);
+    void RemoveWaitingThread(Thread* thread);
 
     /**
      * Wake up the next thread waiting on this object
      * @return Pointer to the thread that was resumed, nullptr if no threads are waiting
      */
-    Thread* WakeupNextThread();
+    SharedPtr<Thread> WakeupNextThread();
 
     /// Wake up all threads waiting on this object
     void WakeupAllWaitingThreads();
 
 private:
-    std::vector<Thread*> waiting_threads; ///< Threads waiting for this object to become available
+    /// Threads waiting for this object to become available
+    std::vector<SharedPtr<Thread>> waiting_threads;
 };
 
 /**
@@ -275,7 +276,6 @@ private:
 };
 
 extern HandleTable g_handle_table;
-extern SharedPtr<Thread> g_main_thread;
 
 /// The ID code of the currently running game
 /// TODO(Subv): This variable should not be here,