Merge https://github.com/angavrilov/dfhack

library/Core.cpp

@@ -104,6 +104,20 @@ struct Core::Cond
     bool predicate;
 };
 
+struct Core::Private
+{
+    tthread::mutex AccessMutex;
+    tthread::mutex StackMutex;
+    std::stack<Core::Cond*> suspended_tools;
+    Core::Cond core_cond;
+    thread::id df_suspend_thread;
+    int df_suspend_depth;
+
+    Private() {
+        df_suspend_depth = 0;
+    }
+};
+
 void cheap_tokenise(string const& input, vector<string> &output)
 {
     string *cur = NULL;
@@ -576,6 +590,8 @@ void fIOthread(void * iodata)
 
 Core::Core()
 {
+    d = new Private();
+
     // init the console. This must be always the first step!
     plug_mgr = 0;
     vif = 0;
@@ -585,10 +601,6 @@ Core::Core()
     started = false;
     memset(&(s_mods), 0, sizeof(s_mods));
 
-    // create mutex for syncing with interactive tasks
-    AccessMutex = 0;
-    StackMutex = 0;
-    core_cond = 0;
     // set up hotkey capture
     hotkey_set = false;
     HotkeyMutex = 0;
@@ -687,10 +699,7 @@ bool Core::Init()
     df::global::InitGlobals();
 
     // create mutex for syncing with interactive tasks
-    StackMutex = new mutex();
-    AccessMutex = new mutex();
     misc_data_mutex=new mutex();
-    core_cond = new Core::Cond();
     cerr << "Initializing Plugins.\n";
     // create plugin manager
     plug_mgr = new PluginManager(this);
@@ -783,22 +792,49 @@ void *Core::GetData( std::string key )
 
 void Core::Suspend()
 {
-    Core::Cond * nc = new Core::Cond();
+    auto tid = this_thread::get_id();
+
+    // If recursive, just increment the count
+    {
+        lock_guard<mutex> lock(d->AccessMutex);
+
+        if (d->df_suspend_depth > 0 && d->df_suspend_thread == tid)
+        {
+            d->df_suspend_depth++;
+            return;
+        }
+    }
+
     // put the condition on a stack
-    StackMutex->lock();
-        suspended_tools.push(nc);
-    StackMutex->unlock();
+    Core::Cond *nc = new Core::Cond();
+
+    {
+        lock_guard<mutex> lock2(d->StackMutex);
+
+        d->suspended_tools.push(nc);
+    }
+
     // wait until Core::Update() wakes up the tool
-    AccessMutex->lock();
-        nc->Lock(AccessMutex);
-    AccessMutex->unlock();
+    {
+        lock_guard<mutex> lock(d->AccessMutex);
+
+        nc->Lock(&d->AccessMutex);
+
+        assert(d->df_suspend_depth == 0);
+        d->df_suspend_thread = tid;
+        d->df_suspend_depth = 1;
+    }
 }
 
 void Core::Resume()
 {
-    AccessMutex->lock();
-        core_cond->Unlock();
-    AccessMutex->unlock();
+    auto tid = this_thread::get_id();
+    lock_guard<mutex> lock(d->AccessMutex);
+
+    assert(d->df_suspend_depth > 0 && d->df_suspend_thread == tid);
+
+    if (--d->df_suspend_depth == 0)
+        d->core_cond.Unlock();
 }
 
 int Core::TileUpdate()
@@ -853,21 +889,24 @@ int Core::Update()
 
     // wake waiting tools
     // do not allow more tools to join in while we process stuff here
-    StackMutex->lock();
-    while (!suspended_tools.empty())
+    lock_guard<mutex> lock_stack(d->StackMutex);
+
+    while (!d->suspended_tools.empty())
     {
-        Core::Cond * nc = suspended_tools.top();
-        suspended_tools.pop();
-        AccessMutex->lock();
-            // wake tool
-            nc->Unlock();
-            // wait for tool to wake us
-            core_cond->Lock(AccessMutex);
-        AccessMutex->unlock();
+        Core::Cond * nc = d->suspended_tools.top();
+        d->suspended_tools.pop();
+
+        lock_guard<mutex> lock(d->AccessMutex);
+        // wake tool
+        nc->Unlock();
+        // wait for tool to wake us
+        d->core_cond.Lock(&d->AccessMutex);
+        // verify
+        assert(d->df_suspend_depth == 0);
         // destroy condition
         delete nc;
     }
-    StackMutex->unlock();
+
     return 0;
 };
 

library/RemoteServer.cpp

@@ -64,11 +64,21 @@ using dfproto::CoreTextFragment;
 using google::protobuf::MessageLite;
 
 CoreService::CoreService() {
+    suspend_depth = 0;
+
     // These 2 methods must be first, so that they get id 0 and 1
     addMethod("BindMethod", &CoreService::BindMethod);
     addMethod("RunCommand", &CoreService::RunCommand);
 
     // Add others here:
+    addMethod("CoreSuspend", &CoreService::CoreSuspend);
+    addMethod("CoreResume", &CoreService::CoreResume);
+}
+
+CoreService::~CoreService()
+{
+    while (suspend_depth-- > 0)
+        Core::getInstance().Resume();
 }
 
 command_result CoreService::BindMethod(color_ostream &stream,
@@ -107,6 +117,23 @@ command_result CoreService::RunCommand(color_ostream &stream,
     return Core::getInstance().plug_mgr->InvokeCommand(stream, cmd, args);
 }
 
+command_result CoreService::CoreSuspend(color_ostream &stream, const EmptyMessage*, IntMessage *cnt)
+{
+    Core::getInstance().Suspend();
+    cnt->set_value(++suspend_depth);
+    return CR_OK;
+}
+
+command_result CoreService::CoreResume(color_ostream &stream, const EmptyMessage*, IntMessage *cnt)
+{
+    if (suspend_depth <= 0)
+        return CR_WRONG_USAGE;
+
+    Core::getInstance().Resume();
+    cnt->set_value(--suspend_depth);
+    return CR_OK;
+}
+
 RPCService::RPCService()
 {
     owner = NULL;

library/include/Core.h

@@ -141,24 +141,28 @@ namespace DFHack
         DFHack::Console con;
 
         Core();
+
+        class Private;
+        Private *d;
+
         bool Init();
         int Update (void);
         int TileUpdate (void);
         int Shutdown (void);
         int SDL_Event(SDL::Event* event);
         bool ncurses_wgetch(int in, int & out);
+
         Core(Core const&);              // Don't Implement
         void operator=(Core const&);    // Don't implement
+
         // report error to user while failing
         void fatal (std::string output, bool will_deactivate);
+
         // 1 = fatal failure
         bool errorstate;
         // regulate access to DF
         struct Cond;
-        tthread::mutex * AccessMutex;
-        tthread::mutex * StackMutex;
-        std::stack < Core::Cond * > suspended_tools;
-        Core::Cond * core_cond;
+
         // FIXME: shouldn't be kept around like this
         DFHack::VersionInfoFactory * vif;
         // Module storage

library/include/RemoteClient.h

@@ -34,6 +34,8 @@ distribution.
 namespace  DFHack
 {
     using dfproto::EmptyMessage;
+    using dfproto::IntMessage;
+    using dfproto::StringMessage;
 
     enum command_result
     {

library/include/RemoteServer.h

@@ -189,14 +189,20 @@ namespace  DFHack
     };
 
     class CoreService : public RPCService {
+        int suspend_depth;
     public:
         CoreService();
+        ~CoreService();
 
         command_result BindMethod(color_ostream &stream,
                                   const dfproto::CoreBindRequest *in,
                                   dfproto::CoreBindReply *out);
         command_result RunCommand(color_ostream &stream,
                                   const dfproto::CoreRunCommandRequest *in);
+
+        // For batching
+        command_result CoreSuspend(color_ostream &stream, const EmptyMessage*, IntMessage *cnt);
+        command_result CoreResume(color_ostream &stream, const EmptyMessage*, IntMessage *cnt);
     };
 
     class DFHACK_EXPORT ServerConnection {

library/proto/CoreProtocol.proto

@@ -45,6 +45,14 @@ message CoreErrorNotification {
 
 message EmptyMessage {}
 
+message IntMessage {
+    required int32 value = 1;
+}
+
+message StringMessage {
+    required string value = 1;
+}
+
 message CoreBindRequest {
     required string method = 1;
     required string input_msg = 2;