diff --git a/CMakeLists.txt b/CMakeLists.txt
index 45edb40bd..f250aacfb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,6 +137,21 @@ ${CMAKE_MODULE_PATH}
 # generates compile_commands.json, used for autocompletion by some editors
 SET(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+include(CheckCXXSourceCompiles)
+CHECK_CXX_SOURCE_COMPILES("
+#include <cstdlib>
+#include <cuchar>
+int main(void) {
+    char32_t in = 0;
+    char out[MB_CUR_MAX];
+    std::mbstate_t state{};
+    std::c32rtomb(out, in, &state);
+    return 0;
+}" HAVE_CUCHAR2)
+if(HAVE_CUCHAR2)
+    add_definitions("-DHAVE_CUCHAR")
+endif()
+
 # mixing the build system with the source code is ugly and stupid. enforce the opposite :)
 if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
    message(FATAL_ERROR "In-source builds are not allowed.")
diff --git a/library/Console-posix.cpp b/library/Console-posix.cpp
index ef74e67d2..a06008cba 100644
--- a/library/Console-posix.cpp
+++ b/library/Console-posix.cpp
@@ -60,6 +60,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <termios.h>
 #include <errno.h>
 #include <deque>
+#ifdef HAVE_CUCHAR
+#include <cuchar>
+#else
+#include <cwchar>
+#endif
 
 // George Vulov for MacOSX
 #ifndef __LINUX__
@@ -133,6 +138,68 @@ const char * getANSIColor(const int c)
     }
 }
 
+
+#ifdef HAVE_CUCHAR
+// Use u32string for GCC 6 and later and msvc to allow potable implementation
+using u32string = std::u32string;
+using std::c32rtomb;
+using std::mbrtoc32;
+#else
+// Fallback for gcc 4 and 5 that don't have cuchar header
+// But wchar_t is 4 bytes that is a good fallback implementation
+using u32string = std::wstring;
+size_t mbrtoc32(u32string::value_type* c,
+        const char* s,
+        std::size_t n,
+        std::mbstate_t* ps)
+{
+    return std::mbrtowc(c, s, n, ps);
+}
+
+size_t c32rtomb(char* mb,
+        u32string::value_type c,
+        std::mbstate_t* ps)
+{
+    return std::wcrtomb(mb, c, ps);
+}
+#endif
+
+//! Convert a locale defined multibyte coding to UTF-32 string for easier
+//! character processing.
+static u32string fromLocaleMB(const std::string& str)
+{
+    u32string rv;
+    u32string::value_type ch;
+    size_t pos = 0;
+    ssize_t sz;
+    std::mbstate_t state{};
+    while ((sz = mbrtoc32(&ch,&str[pos], str.size() - pos, &state)) != 0) {
+        if (sz == -1 || sz == -2)
+            break;
+        rv.push_back(ch);
+        if (sz == -3) /* multi value character */
+            continue;
+        pos += sz;
+    }
+    return rv;
+}
+
+//! Convert a UTF-32 string back to locale defined multibyte coding.
+static std::string toLocaleMB(const u32string& wstr)
+{
+    std::stringstream ss{};
+    char mb[MB_CUR_MAX];
+    std::mbstate_t state{};
+    const size_t err = -1;
+    for (auto ch: wstr) {
+        size_t sz = c32rtomb(mb, ch, &state);
+        if (sz == err)
+            break;
+        ss.write(mb, sz);
+    }
+    return ss.str();
+}
+
 namespace DFHack
 {
     class Private
@@ -157,7 +224,7 @@ namespace DFHack
             FD_SET(STDIN_FILENO, &descriptor_set);
             FD_SET(exit_pipe[0], &descriptor_set);
             int ret = TMP_FAILURE_RETRY(
-                select (FD_SETSIZE,&descriptor_set, NULL, NULL, NULL)
+                select (std::max(STDIN_FILENO,exit_pipe[0])+1,&descriptor_set, NULL, NULL, NULL)
             );
             if(ret == -1)
                 return false;
@@ -364,7 +431,7 @@ namespace DFHack
                 print("\n");
                 if(count != -1)
                 {
-                    output = raw_buffer;
+                    output = toLocaleMB(raw_buffer);
                 }
                 return count;
             }
@@ -414,26 +481,24 @@ namespace DFHack
             char seq[64];
             int cols = get_columns();
             int plen = prompt.size();
-            const char * buf = raw_buffer.c_str();
             int len = raw_buffer.size();
+            int begin = 0;
             int cooked_cursor = raw_cursor;
-            // Use math! This is silly.
-            while((plen+cooked_cursor) >= cols)
-            {
-                buf++;
-                len--;
-                cooked_cursor--;
-            }
-            while (plen+len > cols)
+            if ((plen+cooked_cursor) >= cols)
             {
-                len--;
+                begin = plen+cooked_cursor-cols-1;
+                len -= plen+cooked_cursor-cols-1;
+                cooked_cursor -= plen+cooked_cursor-cols-1;
             }
+            if (plen+len > cols)
+                len -= plen+len - cols;
+            std::string mbstr = toLocaleMB(raw_buffer.substr(begin,len));
             /* Cursor to left edge */
             snprintf(seq,64,"\x1b[1G");
             if (::write(STDIN_FILENO,seq,strlen(seq)) == -1) return;
             /* Write the prompt and the current buffer content */
             if (::write(STDIN_FILENO,prompt.c_str(),plen) == -1) return;
-            if (::write(STDIN_FILENO,buf,len) == -1) return;
+            if (::write(STDIN_FILENO,mbstr.c_str(),mbstr.length()) == -1) return;
             /* Erase to right */
             snprintf(seq,64,"\x1b[0K");
             if (::write(STDIN_FILENO,seq,strlen(seq)) == -1) return;
@@ -555,7 +620,7 @@ namespace DFHack
                             {
                                 /* Update the current history entry before to
                                  * overwrite it with tne next one. */
-                                history[history_index] = raw_buffer;
+                                history[history_index] = toLocaleMB(raw_buffer);
                                 /* Show the new entry */
                                 history_index += (seq[1] == 'A') ? 1 : -1;
                                 if (history_index < 0)
@@ -568,7 +633,7 @@ namespace DFHack
                                     history_index = history.size()-1;
                                     break;
                                 }
-                                raw_buffer = history[history_index];
+                                raw_buffer = fromLocaleMB(history[history_index]);
                                 raw_cursor = raw_buffer.size();
                                 prompt_refresh();
                             }
@@ -672,15 +737,30 @@ namespace DFHack
                 default:
                     if (c >= 32)  // Space
                     {
+                        u32string::value_type c32;
+                        char mb[MB_CUR_MAX];
+                        size_t count = 1;
+                        mb[0] = c;
+                        ssize_t sz;
+                        std::mbstate_t state{};
+                        // Read all bytes belonging to a multi byte
+                        // character starting from the first bye already red
+                        while ((sz = mbrtoc32(&c32,&mb[count-1],1, &state)) < 0) {
+                            if (sz == -1 || sz == -3)
+                                return -1; /* mbrtoc32 error (not valid utf-32 character */
+                            if(!read_char(c))
+                                return -2;
+                            mb[count++] = c;
+                        }
                         if (raw_buffer.size() == size_t(raw_cursor))
                         {
-                            raw_buffer.append(1,c);
+                            raw_buffer.append(1,c32);
                             raw_cursor++;
                             if (plen+raw_buffer.size() < size_t(get_columns()))
                             {
                                 /* Avoid a full update of the line in the
                                  * trivial case. */
-                                if (::write(fd,&c,1) == -1) return -1;
+                                if (::write(fd,mb,count) == -1) return -1;
                             }
                             else
                             {
@@ -689,7 +769,7 @@ namespace DFHack
                         }
                         else
                         {
-                            raw_buffer.insert(raw_cursor,1,c);
+                            raw_buffer.insert(raw_cursor,1,c32);
                             raw_cursor++;
                             prompt_refresh();
                         }
@@ -712,8 +792,8 @@ namespace DFHack
         } state;
         bool in_batch;
         std::string prompt;      // current prompt string
-        std::string raw_buffer;  // current raw mode buffer
-        std::string yank_buffer; // last text deleted with Ctrl-K/Ctrl-U
+        u32string raw_buffer;  // current raw mode buffer
+        u32string yank_buffer; // last text deleted with Ctrl-K/Ctrl-U
         int raw_cursor;          // cursor position in the buffer
         // thread exit mechanism
         int exit_pipe[2];
@@ -730,8 +810,7 @@ Console::Console()
 }
 Console::~Console()
 {
-    if(inited)
-        shutdown();
+    assert(!inited);
     if(wlock)
         delete wlock;
     if(d)
@@ -768,11 +847,6 @@ bool Console::shutdown(void)
     if(!d)
         return true;
     lock_guard <recursive_mutex> g(*wlock);
-    if(d->rawmode)
-        d->disable_raw();
-    d->print("\n");
-    inited = false;
-    // kill the thing
     close(d->exit_pipe[1]);
     return true;
 }
@@ -854,8 +928,16 @@ int Console::lineedit(const std::string & prompt, std::string & output, CommandH
 {
     lock_guard <recursive_mutex> g(*wlock);
     int ret = -2;
-    if(inited)
+    if(inited) {
         ret = d->lineedit(prompt,output,wlock,ch);
+        if (ret == -2) {
+            // kill the thing
+            if(d->rawmode)
+                d->disable_raw();
+            d->print("\n");
+            inited = false;
+        }
+    }
     return ret;
 }
 
diff --git a/library/Console-windows.cpp b/library/Console-windows.cpp
index 3caacd924..f3771f4ff 100644
--- a/library/Console-windows.cpp
+++ b/library/Console-windows.cpp
@@ -285,7 +285,10 @@ namespace DFHack
                 INPUT_RECORD rec;
                 DWORD count;
                 lock->unlock();
-                ReadConsoleInputA(console_in, &rec, 1, &count);
+                if (ReadConsoleInputA(console_in, &rec, 1, &count) != 0) {
+                    lock->lock();
+                    return -2;
+                }
                 lock->lock();
                 if (rec.EventType != KEY_EVENT || !rec.Event.KeyEvent.bKeyDown)
                     continue;
diff --git a/library/Core.cpp b/library/Core.cpp
index 62ede1162..463175e0f 100644
--- a/library/Core.cpp
+++ b/library/Core.cpp
@@ -77,7 +77,9 @@ using namespace DFHack;
 #include <iomanip>
 #include <stdlib.h>
 #include <fstream>
-#include "tinythread.h"
+#include <thread>
+#include <mutex>
+#include <condition_variable>
 #include "md5wrapper.h"
 
 #include "SDL_events.h"
@@ -86,7 +88,6 @@ using namespace DFHack;
 #include <dlfcn.h>
 #endif
 
-using namespace tthread;
 using namespace df::enums;
 using df::global::init;
 using df::global::world;
@@ -96,48 +97,18 @@ using df::global::world;
 static bool parseKeySpec(std::string keyspec, int *psym, int *pmod, std::string *pfocus = NULL);
 size_t loadScriptFiles(Core* core, color_ostream& out, const vector<std::string>& prefix, const std::string& folder);
 
-struct Core::Cond
-{
-    Cond()
-    {
-        predicate = false;
-        wakeup = new tthread::condition_variable();
-    }
-    ~Cond()
-    {
-        delete wakeup;
-    }
-    bool Lock(tthread::mutex * m)
-    {
-        while(!predicate)
-        {
-            wakeup->wait(*m);
-        }
-        predicate = false;
-        return true;
-    }
-    bool Unlock()
-    {
-        predicate = true;
-        wakeup->notify_one();
-        return true;
-    }
-    tthread::condition_variable * wakeup;
-    bool predicate;
-};
+//! mainThreadSuspend keeps the main DF thread suspended from Core::Init to
+//! thread exit.
+template<typename M>
+static std::unique_lock<M>& mainThreadSuspend(M& mutex) {
+    static thread_local std::unique_lock<M> lock(mutex, std::defer_lock);
+    return lock;
+}
 
 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;
-    }
+    std::thread iothread;
+    std::thread hotkeythread;
 };
 
 struct CommandDepthCounter
@@ -227,9 +198,10 @@ void fHKthread(void * iodata)
         cerr << "Hotkey thread has croaked." << endl;
         return;
     }
-    while(1)
+    bool keep_going = true;
+    while(keep_going)
     {
-        std::string stuff = core->getHotkeyCmd(); // waits on mutex!
+        std::string stuff = core->getHotkeyCmd(keep_going); // waits on mutex!
         if(!stuff.empty())
         {
             color_ostream_proxy out(core->getConsole());
@@ -510,7 +482,7 @@ static bool try_autocomplete(color_ostream &con, const std::string &first, std::
 
 bool Core::addScriptPath(string path, bool search_before)
 {
-    lock_guard<mutex> lock(*script_path_mutex);
+    lock_guard<mutex> lock(script_path_mutex);
     vector<string> &vec = script_paths[search_before ? 0 : 1];
     if (std::find(vec.begin(), vec.end(), path) != vec.end())
         return false;
@@ -522,7 +494,7 @@ bool Core::addScriptPath(string path, bool search_before)
 
 bool Core::removeScriptPath(string path)
 {
-    lock_guard<mutex> lock(*script_path_mutex);
+    lock_guard<mutex> lock(script_path_mutex);
     bool found = false;
     for (int i = 0; i < 2; i++)
     {
@@ -541,7 +513,7 @@ bool Core::removeScriptPath(string path)
 
 void Core::getScriptPaths(std::vector<std::string> *dest)
 {
-    lock_guard<mutex> lock(*script_path_mutex);
+    lock_guard<mutex> lock(script_path_mutex);
     dest->clear();
     string df_path = this->p->getPath();
     for (auto it = script_paths[0].begin(); it != script_paths[0].end(); ++it)
@@ -1480,10 +1452,33 @@ void fIOthread(void * iodata)
     }
 }
 
-Core::Core()
+Core::~Core()
 {
-    d = new Private();
+    if (mainThreadSuspend(CoreSuspendMutex).owns_lock())
+        mainThreadSuspend(CoreSuspendMutex).unlock();
+
+    if (d->hotkeythread.joinable()) {
+        std::lock_guard<std::mutex> lock(HotkeyMutex);
+        hotkey_set = SHUTDOWN;
+        HotkeyCond.notify_one();
+    }
+    if (d->iothread.joinable())
+        con.shutdown();
+    delete d;
+}
 
+Core::Core() :
+    d{new Private},
+    script_path_mutex{},
+    HotkeyMutex{},
+    HotkeyCond{},
+    alias_mutex{},
+    misc_data_mutex{},
+    CoreSuspendMutex{},
+    CoreWakeup{},
+    ownerThread{},
+    toolCount{0}
+{
     // init the console. This must be always the first step!
     plug_mgr = 0;
     vif = 0;
@@ -1494,11 +1489,7 @@ Core::Core()
     memset(&(s_mods), 0, sizeof(s_mods));
 
     // set up hotkey capture
-    hotkey_set = false;
-    HotkeyMutex = 0;
-    HotkeyCond = 0;
-    alias_mutex = 0;
-    misc_data_mutex = 0;
+    hotkey_set = NO;
     last_world_data_ptr = NULL;
     last_local_map_ptr = NULL;
     last_pause_state = false;
@@ -1508,7 +1499,6 @@ Core::Core()
 
     color_ostream::log_errors_to_stderr = true;
 
-    script_path_mutex = new mutex();
 };
 
 void Core::fatal (std::string output)
@@ -1552,6 +1542,10 @@ bool Core::Init()
     if(errorstate)
         return false;
 
+    // Lock the CoreSuspendMutex until the thread exits or call Core::Shutdown
+    // Core::Update will temporary unlock when there is any commands queued
+    mainThreadSuspend(CoreSuspendMutex).lock();
+
     // Re-route stdout and stderr again - DF seems to set up stdout and
     // stderr.txt on Windows as of 0.43.05. Also, log before switching files to
     // make it obvious what's going on if someone checks the *.txt files.
@@ -1642,7 +1636,6 @@ bool Core::Init()
 
     // Init global object pointers
     df::global::InitGlobals();
-    alias_mutex = new recursive_mutex();
 
     cerr << "Initializing Console.\n";
     // init the console.
@@ -1732,7 +1725,6 @@ bool Core::Init()
     }
 
     // create mutex for syncing with interactive tasks
-    misc_data_mutex=new mutex();
     cerr << "Initializing Plugins.\n";
     // create plugin manager
     plug_mgr = new PluginManager(this);
@@ -1741,27 +1733,21 @@ bool Core::Init()
     temp->core = this;
     temp->plug_mgr = plug_mgr;
 
-    HotkeyMutex = new mutex();
-    HotkeyCond = new condition_variable();
-
     if (!is_text_mode || is_headless)
     {
         cerr << "Starting IO thread.\n";
         // create IO thread
-        thread * IO = new thread(fIOthread, (void *) temp);
-        (void)IO;
+        d->iothread = std::thread{fIOthread, (void*)temp};
     }
     else
     {
-        cerr << "Starting dfhack.init thread.\n";
-        thread * init = new thread(fInitthread, (void *) temp);
-        (void)init;
+        std::cerr << "Starting dfhack.init thread.\n";
+        d->iothread = std::thread{fInitthread, (void*)temp};
     }
 
     cerr << "Starting DF input capture thread.\n";
     // set up hotkey capture
-    thread * HK = new thread(fHKthread, (void *) temp);
-    (void)HK;
+    d->hotkeythread = std::thread(fHKthread, (void *) temp);
     screen_window = new Windows::top_level_window();
     screen_window->addChild(new Windows::dfhack_dummy(5,10));
     started = true;
@@ -1840,28 +1826,25 @@ bool Core::Init()
 bool Core::setHotkeyCmd( std::string cmd )
 {
     // access command
-    HotkeyMutex->lock();
-    {
-        hotkey_set = true;
-        hotkey_cmd = cmd;
-        HotkeyCond->notify_all();
-    }
-    HotkeyMutex->unlock();
+    std::lock_guard<std::mutex> lock(HotkeyMutex);
+    hotkey_set = SET;
+    hotkey_cmd = cmd;
+    HotkeyCond.notify_all();
     return true;
 }
 /// removes the hotkey command and gives it to the caller thread
-std::string Core::getHotkeyCmd( void )
+std::string Core::getHotkeyCmd( bool &keep_going )
 {
     string returner;
-    HotkeyMutex->lock();
-    while ( ! hotkey_set )
-    {
-        HotkeyCond->wait(*HotkeyMutex);
+    std::unique_lock<std::mutex> lock(HotkeyMutex);
+    HotkeyCond.wait(lock, [this]() -> bool {return this->hotkey_set;});
+    if (hotkey_set == SHUTDOWN) {
+        keep_going = false;
+        return returner;
     }
-    hotkey_set = false;
+    hotkey_set = NO;
     returner = hotkey_cmd;
     hotkey_cmd.clear();
-    HotkeyMutex->unlock();
     return returner;
 }
 
@@ -1887,82 +1870,29 @@ void Core::printerr(const char *format, ...)
 
 void Core::RegisterData( void *p, std::string key )
 {
-    misc_data_mutex->lock();
+    std::lock_guard<std::mutex> lock(misc_data_mutex);
     misc_data_map[key] = p;
-    misc_data_mutex->unlock();
 }
 
 void *Core::GetData( std::string key )
 {
-    misc_data_mutex->lock();
+    std::lock_guard<std::mutex> lock(misc_data_mutex);
     std::map<std::string,void*>::iterator it=misc_data_map.find(key);
 
     if ( it != misc_data_map.end() )
     {
         void *p=it->second;
-        misc_data_mutex->unlock();
         return p;
     }
     else
     {
-        misc_data_mutex->unlock();
         return 0;// or throw an error.
     }
 }
 
 bool Core::isSuspended(void)
 {
-    lock_guard<mutex> lock(d->AccessMutex);
-
-    return (d->df_suspend_depth > 0 && d->df_suspend_thread == this_thread::get_id());
-}
-
-void Core::Suspend()
-{
-    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
-    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
-    {
-        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()
-{
-    auto tid = this_thread::get_id();
-    lock_guard<mutex> lock(d->AccessMutex);
-
-    assert(d->df_suspend_depth > 0 && d->df_suspend_thread == tid);
-    (void)tid;
-
-    if (--d->df_suspend_depth == 0)
-        d->core_cond.Unlock();
+    return ownerThread.load() == std::this_thread::get_id();
 }
 
 int Core::TileUpdate()
@@ -1973,40 +1903,6 @@ int Core::TileUpdate()
     return true;
 }
 
-int Core::ClaimSuspend(bool force_base)
-{
-    auto tid = this_thread::get_id();
-    lock_guard<mutex> lock(d->AccessMutex);
-
-    if (force_base || d->df_suspend_depth <= 0)
-    {
-        assert(d->df_suspend_depth == 0);
-
-        d->df_suspend_thread = tid;
-        d->df_suspend_depth = 1000000;
-        return 1000000;
-    }
-    else
-    {
-        assert(d->df_suspend_thread == tid);
-        return ++d->df_suspend_depth;
-    }
-}
-
-void Core::DisclaimSuspend(int level)
-{
-    auto tid = this_thread::get_id();
-    lock_guard<mutex> lock(d->AccessMutex);
-
-    assert(d->df_suspend_depth == level && d->df_suspend_thread == tid);
-    (void)tid;
-
-    if (level == 1000000)
-        d->df_suspend_depth = 0;
-    else
-        --d->df_suspend_depth;
-}
-
 void Core::doUpdate(color_ostream &out, bool first_update)
 {
     Lua::Core::Reset(out, "DF code execution");
@@ -2126,27 +2022,9 @@ int Core::Update()
         doUpdate(out, first_update);
     }
 
-    // wake waiting tools
-    // do not allow more tools to join in while we process stuff here
-    lock_guard<mutex> lock_stack(d->StackMutex);
-
-    while (!d->suspended_tools.empty())
-    {
-        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;
-        // check lua stack depth
-        Lua::Core::Reset(out, "suspend");
-    }
+    // Let all commands run that require CoreSuspender
+    CoreWakeup.wait(mainThreadSuspend(CoreSuspendMutex),
+            [this]() -> bool {return this->toolCount.load() == 0;});
 
     return 0;
 };
@@ -2360,12 +2238,31 @@ void Core::onStateChange(color_ostream &out, state_change_event event)
     handleLoadAndUnloadScripts(out, event);
 }
 
-// FIXME: needs to terminate the IO threads and properly dismantle all the machinery involved.
 int Core::Shutdown ( void )
 {
     if(errorstate)
         return true;
     errorstate = 1;
+
+    // Make sure we release main thread if this is called from main thread
+    if (mainThreadSuspend(CoreSuspendMutex).owns_lock())
+        mainThreadSuspend(CoreSuspendMutex).unlock();
+
+    // Make sure the console thread shutdowns before clean up to avoid any
+    // unlikely data races.
+    if (d->iothread.joinable()) {
+        con.shutdown();
+    }
+
+    if (d->hotkeythread.joinable()) {
+        std::unique_lock<std::mutex> hot_lock(HotkeyMutex);
+        hotkey_set = SHUTDOWN;
+        HotkeyCond.notify_one();
+    }
+
+    d->hotkeythread.join();
+    d->iothread.join();
+
     CoreSuspendClaimer suspend;
     if(plug_mgr)
     {
@@ -2379,7 +2276,6 @@ int Core::Shutdown ( void )
     }
     allModules.clear();
     memset(&(s_mods), 0, sizeof(s_mods));
-    con.shutdown();
     return -1;
 }
 
@@ -2530,7 +2426,7 @@ bool Core::SelectHotkey(int sym, int modifiers)
     std::string cmd;
 
     {
-        tthread::lock_guard<tthread::mutex> lock(*HotkeyMutex);
+        std::lock_guard<std::mutex> lock(HotkeyMutex);
 
         // Check the internal keybindings
         std::vector<KeyBinding> &bindings = key_bindings[sym];
@@ -2629,7 +2525,7 @@ bool Core::ClearKeyBindings(std::string keyspec)
     if (!parseKeySpec(keyspec, &sym, &mod, &focus))
         return false;
 
-    tthread::lock_guard<tthread::mutex> lock(*HotkeyMutex);
+    std::lock_guard<std::mutex> lock(HotkeyMutex);
 
     std::vector<KeyBinding> &bindings = key_bindings[sym];
     for (int i = bindings.size()-1; i >= 0; --i) {
@@ -2668,7 +2564,7 @@ bool Core::AddKeyBinding(std::string keyspec, std::string cmdline)
     if (binding.command.empty())
         return false;
 
-    tthread::lock_guard<tthread::mutex> lock(*HotkeyMutex);
+    std::lock_guard<std::mutex> lock(HotkeyMutex);
 
     // Don't add duplicates
     std::vector<KeyBinding> &bindings = key_bindings[sym];
@@ -2692,7 +2588,7 @@ std::vector<std::string> Core::ListKeyBindings(std::string keyspec)
     if (!parseKeySpec(keyspec, &sym, &mod, &focus))
         return rv;
 
-    tthread::lock_guard<tthread::mutex> lock(*HotkeyMutex);
+    std::lock_guard<std::mutex> lock(HotkeyMutex);
 
     std::vector<KeyBinding> &bindings = key_bindings[sym];
     for (int i = bindings.size()-1; i >= 0; --i) {
@@ -2712,7 +2608,7 @@ std::vector<std::string> Core::ListKeyBindings(std::string keyspec)
 
 bool Core::AddAlias(const std::string &name, const std::vector<std::string> &command, bool replace)
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     if (!IsAlias(name) || replace)
     {
         aliases[name] = command;
@@ -2723,7 +2619,7 @@ bool Core::AddAlias(const std::string &name, const std::vector<std::string> &com
 
 bool Core::RemoveAlias(const std::string &name)
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     if (IsAlias(name))
     {
         aliases.erase(name);
@@ -2734,14 +2630,14 @@ bool Core::RemoveAlias(const std::string &name)
 
 bool Core::IsAlias(const std::string &name)
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     return aliases.find(name) != aliases.end();
 }
 
 bool Core::RunAlias(color_ostream &out, const std::string &name,
     const std::vector<std::string> &parameters, command_result &result)
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     if (!IsAlias(name))
     {
         return false;
@@ -2756,13 +2652,13 @@ bool Core::RunAlias(color_ostream &out, const std::string &name,
 
 std::map<std::string, std::vector<std::string>> Core::ListAliases()
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     return aliases;
 }
 
 std::string Core::GetAliasCommand(const std::string &name, const std::string &default_)
 {
-    tthread::lock_guard<tthread::recursive_mutex> lock(*alias_mutex);
+    std::lock_guard<std::recursive_mutex> lock(alias_mutex);
     if (IsAlias(name))
         return join_strings(" ", aliases[name]);
     else
diff --git a/library/LuaTools.cpp b/library/LuaTools.cpp
index 24d6917ff..8e05fbe22 100644
--- a/library/LuaTools.cpp
+++ b/library/LuaTools.cpp
@@ -283,9 +283,6 @@ static int lua_dfhack_is_interactive(lua_State *S)
 
 static int dfhack_lineedit_sync(lua_State *S, Console *pstream)
 {
-    if (!pstream)
-        return 2;
-
     const char *prompt = luaL_optstring(S, 1, ">> ");
     const char *hfile = luaL_optstring(S, 2, NULL);
 
@@ -299,7 +296,10 @@ static int dfhack_lineedit_sync(lua_State *S, Console *pstream)
     if (rv < 0)
     {
         lua_pushnil(S);
-        lua_pushstring(S, "input error");
+        if (rv == -2)
+            lua_pushstring(S, "shutdown requested");
+        else
+            lua_pushstring(S, "input error");
         return 2;
     }
     else
@@ -333,8 +333,11 @@ static int dfhack_lineedit(lua_State *S)
     lua_settop(S, 2);
 
     Console *pstream = get_console(S);
-    if (!pstream)
+    if (!pstream) {
+        lua_pushnil(S);
+        lua_pushstring(S, "no console");
         return 2;
+    }
 
     lua_rawgetp(S, LUA_REGISTRYINDEX, &DFHACK_QUERY_COROTABLE_TOKEN);
     lua_rawgetp(S, -1, S);
@@ -1058,7 +1061,11 @@ bool DFHack::Lua::RunCoreQueryLoop(color_ostream &out, lua_State *state,
             prompt = ">> ";
 
         std::string curline;
-        con.lineedit(prompt,curline,hist);
+        rv = con.lineedit(prompt,curline,hist);
+        if (rv < 0) {
+            rv = rv == -2 ? LUA_OK : LUA_ERRRUN;
+            break;
+        }
         hist.add(curline);
 
         {
diff --git a/library/PluginManager.cpp b/library/PluginManager.cpp
index 8e3f436cb..b17f8e214 100644
--- a/library/PluginManager.cpp
+++ b/library/PluginManager.cpp
@@ -49,7 +49,6 @@ using namespace DFHack;
 using namespace std;
 
 #include "tinythread.h"
-using namespace tthread;
 
 #include <assert.h>
 
@@ -83,8 +82,8 @@ struct Plugin::RefLock
     RefLock()
     {
         refcount = 0;
-        wakeup = new condition_variable();
-        mut = new mutex();
+        wakeup = new tthread::condition_variable();
+        mut = new tthread::mutex();
     }
     ~RefLock()
     {
@@ -119,8 +118,8 @@ struct Plugin::RefLock
             wakeup->wait(*mut);
         }
     }
-    condition_variable * wakeup;
-    mutex * mut;
+    tthread::condition_variable * wakeup;
+    tthread::mutex * mut;
     int refcount;
 };
 
@@ -786,8 +785,8 @@ void Plugin::push_function(lua_State *state, LuaFunction *fn)
 
 PluginManager::PluginManager(Core * core) : core(core)
 {
-    plugin_mutex = new recursive_mutex();
-    cmdlist_mutex = new mutex();
+    plugin_mutex = new tthread::recursive_mutex();
+    cmdlist_mutex = new tthread::mutex();
     ruby = NULL;
 }
 
diff --git a/library/RemoteTools.cpp b/library/RemoteTools.cpp
index 26833a3a3..1d45a19c0 100644
--- a/library/RemoteTools.cpp
+++ b/library/RemoteTools.cpp
@@ -652,8 +652,10 @@ static command_result SetUnitLabors(color_ostream &stream, const SetUnitLaborsIn
     return CR_OK;
 }
 
-CoreService::CoreService() {
-    suspend_depth = 0;
+CoreService::CoreService() :
+    suspend_depth{0},
+    coreSuspender{nullptr}
+{
 
     // These 2 methods must be first, so that they get id 0 and 1
     addMethod("BindMethod", &CoreService::BindMethod, SF_DONT_SUSPEND | SF_ALLOW_REMOTE);
@@ -683,8 +685,7 @@ CoreService::CoreService() {
 
 CoreService::~CoreService()
 {
-    while (suspend_depth-- > 0)
-        Core::getInstance().Resume();
+    delete coreSuspender;
 }
 
 command_result CoreService::BindMethod(color_ostream &stream,
@@ -725,7 +726,8 @@ command_result CoreService::RunCommand(color_ostream &stream,
 
 command_result CoreService::CoreSuspend(color_ostream &stream, const EmptyMessage*, IntMessage *cnt)
 {
-    Core::getInstance().Suspend();
+    if (suspend_depth == 0)
+        coreSuspender = new CoreSuspender();
     cnt->set_value(++suspend_depth);
     return CR_OK;
 }
@@ -735,8 +737,11 @@ command_result CoreService::CoreResume(color_ostream &stream, const EmptyMessage
     if (suspend_depth <= 0)
         return CR_WRONG_USAGE;
 
-    Core::getInstance().Resume();
     cnt->set_value(--suspend_depth);
+    if (suspend_depth == 0) {
+        delete coreSuspender;
+        coreSuspender = nullptr;
+    }
     return CR_OK;
 }
 
diff --git a/library/include/Core.h b/library/include/Core.h
index 7d51e7613..8c778fa08 100644
--- a/library/include/Core.h
+++ b/library/include/Core.h
@@ -34,6 +34,11 @@ distribution.
 #include "Console.h"
 #include "modules/Graphic.h"
 
+#include <atomic>
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+
 #include "RemoteClient.h"
 
 #define DFH_MOD_SHIFT 1
@@ -42,13 +47,6 @@ distribution.
 
 struct WINDOW;
 
-namespace tthread
-{
-    class mutex;
-    class condition_variable;
-    class thread;
-}
-
 namespace df
 {
     struct viewscreen;
@@ -65,6 +63,11 @@ namespace DFHack
     class PluginManager;
     class Core;
     class ServerMain;
+    class CoreSuspender;
+
+    namespace Lua { namespace Core {
+        DFHACK_EXPORT void Reset(color_ostream &out, const char *where);
+    } }
     namespace Windows
     {
         class df_window;
@@ -133,10 +136,6 @@ namespace DFHack
         }
         /// check if the activity lock is owned by this thread
         bool isSuspended(void);
-        /// try to acquire the activity lock
-        void Suspend(void);
-        /// return activity lock
-        void Resume(void);
         /// Is everything OK?
         bool isValid(void) { return !errorstate; }
 
@@ -149,7 +148,7 @@ namespace DFHack
         /// sets the current hotkey command
         bool setHotkeyCmd( std::string cmd );
         /// removes the hotkey command and gives it to the caller thread
-        std::string getHotkeyCmd( void );
+        std::string getHotkeyCmd( bool &keep_going );
 
         /// adds a named pointer (for later or between plugins)
         void RegisterData(void *p,std::string key);
@@ -202,14 +201,11 @@ namespace DFHack
         DFHack::Console con;
 
         Core();
+        ~Core();
 
         struct Private;
         Private *d;
 
-        friend class CoreSuspendClaimer;
-        int ClaimSuspend(bool force_base);
-        void DisclaimSuspend(int level);
-
         bool Init();
         int Update (void);
         int TileUpdate (void);
@@ -246,7 +242,7 @@ namespace DFHack
         DFHack::PluginManager * plug_mgr;
 
         std::vector<std::string> script_paths[2];
-        tthread::mutex *script_path_mutex;
+        std::mutex script_path_mutex;
 
         // hotkey-related stuff
         struct KeyBinding {
@@ -260,12 +256,17 @@ namespace DFHack
         std::map<int, std::vector<KeyBinding> > key_bindings;
         std::map<int, bool> hotkey_states;
         std::string hotkey_cmd;
-        bool hotkey_set;
-        tthread::mutex * HotkeyMutex;
-        tthread::condition_variable * HotkeyCond;
+        enum hotkey_set_t {
+            NO,
+            SET,
+            SHUTDOWN,
+        };
+        hotkey_set_t hotkey_set;
+        std::mutex HotkeyMutex;
+        std::condition_variable HotkeyCond;
 
         std::map<std::string, std::vector<std::string>> aliases;
-        tthread::recursive_mutex * alias_mutex;
+        std::recursive_mutex alias_mutex;
 
         bool SelectHotkey(int key, int modifiers);
 
@@ -280,35 +281,89 @@ namespace DFHack
         // Additional state change scripts
         std::vector<StateChangeScript> state_change_scripts;
 
-        tthread::mutex * misc_data_mutex;
+        std::mutex misc_data_mutex;
         std::map<std::string,void*> misc_data_map;
 
+        /*!
+         * \defgroup core_suspend CoreSuspender state handling serialization to
+         * DF memory.
+         * \sa DFHack::CoreSuspender
+         * \{
+         */
+        std::recursive_mutex CoreSuspendMutex;
+        std::condition_variable_any CoreWakeup;
+        std::atomic<std::thread::id> ownerThread;
+        std::atomic<size_t> toolCount;
+        //! \}
+
         friend class CoreService;
         friend class ServerConnection;
+        friend class CoreSuspender;
         ServerMain *server;
     };
 
-    class CoreSuspender {
-        Core *core;
-    public:
-        CoreSuspender() : core(&Core::getInstance()) { core->Suspend(); }
-        CoreSuspender(Core *core) : core(core) { core->Suspend(); }
-        ~CoreSuspender() { core->Resume(); }
+    template<typename Derived>
+    struct ToolIncrement {
+        ToolIncrement(std::atomic<size_t>& toolCount) {
+            toolCount += 1;
+        }
     };
 
-    /** Claims the current thread already has the suspend lock.
-     *  Strictly for use in callbacks from DF.
+    /*!
+     * CoreSuspender allows serialization to DF data with std::unique_lock like
+     * interface. It includes handling for recursive CoreSuspender calls and
+     * notification to main thread after all queue tools have been handled.
+     *
+     * State transitions are:
+     * - Startup setups Core::SuspendMutex to unlocked states
+     * - Core::Init locks Core::SuspendMutex until the thread exits or that thread
+     *   calls Core::Shutdown or Core::~Core.
+     * - Other thread request core suspend by atomic incrementation of Core::toolCount
+     *   and then locking Core::CoreSuspendMutex. After locking CoreSuspendMutex
+     *   success callers exchange their std::thread::id to Core::ownerThread.
+     * - Core::Update() makes sure that queued tools are run when it calls
+     *   Core::CoreWakup::wait. The wait keeps Core::CoreSuspendMutex unlocked
+     *   and waits until Core::toolCount is reduced back to zero.
+     * - CoreSuspender::~CoreSuspender() first stores the previous Core::ownerThread
+     *   back. In case of recursive call Core::ownerThread equals tid. If tis is
+     *   zero then we are releasing the recursive_mutex which means suspend
+     *   context is over. It is time to reset lua.
+     *   The last step is to decrement Core::toolCount and wakeup main thread if
+     *   no more tools are queued trying to acquire the
+     *   Core::CoreSuspenderMutex.
      */
-    class CoreSuspendClaimer {
+    class CoreSuspender : protected ToolIncrement<CoreSuspender>,
+                          public std::unique_lock<std::recursive_mutex> {
+        using parent_t = std::unique_lock<std::recursive_mutex>;
         Core *core;
-        int level;
+        std::thread::id tid;
     public:
-        CoreSuspendClaimer(bool base = false) : core(&Core::getInstance()) {
-            level = core->ClaimSuspend(base);
-        }
-        CoreSuspendClaimer(Core *core, bool base = false) : core(core) {
-            level = core->ClaimSuspend(base);
+        CoreSuspender() : CoreSuspender(&Core::getInstance()) { }
+        CoreSuspender(bool) : CoreSuspender(&Core::getInstance()) { }
+        CoreSuspender(Core* core, bool) : CoreSuspender(core) { }
+        CoreSuspender(Core* core) :
+            /* Increment the wait count */
+            ToolIncrement{core->toolCount},
+            /* Lock the core */
+            parent_t{core->CoreSuspendMutex},
+            core{core},
+            /* Mark this thread to be the core owner */
+            tid{core->ownerThread.exchange(std::this_thread::get_id())}
+        { }
+        ~CoreSuspender() {
+            /* Restore core owner to previous value */
+            core->ownerThread.store(tid);
+            if (tid == std::thread::id{})
+                Lua::Core::Reset(core->getConsole(), "suspend");
+            /* Notify core to continue when all queued tools have completed
+             * 0 = None wants to own the core
+             * 1+ = There are tools waiting core access
+             * fetch_add returns old value before subtraction
+             */
+            if (core->toolCount.fetch_add(-1) == 1)
+                core->CoreWakeup.notify_one();
         }
-        ~CoreSuspendClaimer() { core->DisclaimSuspend(level); }
     };
+
+    using CoreSuspendClaimer = CoreSuspender;
 }
diff --git a/library/include/LuaTools.h b/library/include/LuaTools.h
index e1d828271..814afe179 100644
--- a/library/include/LuaTools.h
+++ b/library/include/LuaTools.h
@@ -395,7 +395,7 @@ namespace DFHack {namespace Lua {
 
         // Not exported; for use by the Core class
         bool Init(color_ostream &out);
-        void Reset(color_ostream &out, const char *where);
+        DFHACK_EXPORT void Reset(color_ostream &out, const char *where);
 
         // Events signalled by the core
         void onStateChange(color_ostream &out, int code);
diff --git a/library/include/RemoteTools.h b/library/include/RemoteTools.h
index ead1c0aa1..d7d4eb4fe 100644
--- a/library/include/RemoteTools.h
+++ b/library/include/RemoteTools.h
@@ -133,6 +133,7 @@ namespace DFHack
 
     class CoreService : public RPCService {
         int suspend_depth;
+        CoreSuspender* coreSuspender;
 
         static int doRunLuaFunction(lua_State *L);
     public:
diff --git a/library/lua/utils.lua b/library/lua/utils.lua
index a6007a08f..60830e82f 100644
--- a/library/lua/utils.lua
+++ b/library/lua/utils.lua
@@ -505,17 +505,17 @@ function prompt_yes_no(msg,default)
         prompt = prompt..' (y/n)[n]: '
     end
     while true do
-        local rv = dfhack.lineedit(prompt)
-        if rv then
-            if string.match(rv,'^[Yy]') then
-                return true
-            elseif string.match(rv,'^[Nn]') then
-                return false
-            elseif rv == 'abort' then
-                qerror('User abort')
-            elseif rv == '' and default ~= nil then
-                return default
-            end
+        local rv,err = dfhack.lineedit(prompt)
+        if not rv then
+            qerror(err);
+        elseif string.match(rv,'^[Yy]') then
+            return true
+        elseif string.match(rv,'^[Nn]') then
+            return false
+        elseif rv == 'abort' then
+            qerror('User abort')
+        elseif rv == '' and default ~= nil then
+            return default
         end
     end
 end
@@ -524,7 +524,10 @@ end
 function prompt_input(prompt,check,quit_str)
     quit_str = quit_str or '~~~'
     while true do
-        local rv = dfhack.lineedit(prompt)
+        local rv,err = dfhack.lineedit(prompt)
+        if not rv then
+            qerror(err);
+        end
         if rv == quit_str then
             qerror('User abort')
         end
diff --git a/plugins/Brushes.h b/plugins/Brushes.h
index 6095a03da..0ef9c147e 100644
--- a/plugins/Brushes.h
+++ b/plugins/Brushes.h
@@ -214,7 +214,7 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
                               bool hasConsole = true)
 {
     using namespace DFHack;
-    int newWidth = 0, newHeight = 0, newZLevels = 0;
+    int newWidth = 0, newHeight = 0, newZLevels = 0, rv = 0;
 
     if (end > start + 1)
     {
@@ -237,7 +237,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range width <" << width << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newWidth = command.empty() ? width : atoi(command.c_str());
         } else {
@@ -251,7 +252,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range height <" << height << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newHeight = command.empty() ? height : atoi(command.c_str());
         } else {
@@ -265,7 +267,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range z-levels <" << zLevels << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newZLevels = command.empty() ? zLevels : atoi(command.c_str());
         } else {
diff --git a/plugins/liquids.cpp b/plugins/liquids.cpp
index f0dcf1ce3..12e92a573 100644
--- a/plugins/liquids.cpp
+++ b/plugins/liquids.cpp
@@ -188,8 +188,9 @@ command_result df_liquids (color_ostream &out_, vector <string> & parameters)
         std::stringstream str;
         print_prompt(str, cur_mode);
         str << "# ";
-        if(out.lineedit(str.str(),input,liquids_hist) == -1)
-            return CR_FAILURE;
+        int rv;
+        if((rv = out.lineedit(str.str(),input,liquids_hist)) < 0)
+            return rv == -2 ? CR_OK : CR_FAILURE;
         liquids_hist.add(input);
 
         commands.clear();
diff --git a/plugins/mode.cpp b/plugins/mode.cpp
index 66fb488a6..5258e2007 100644
--- a/plugins/mode.cpp
+++ b/plugins/mode.cpp
@@ -96,6 +96,7 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
     string command = "";
     bool set = false;
     bool abuse = false;
+    int rv = 0;
     t_gamemodes gm;
     for(auto iter = parameters.begin(); iter != parameters.end(); iter++)
     {
@@ -139,9 +140,9 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
             string selected;
             input_again:
             CommandHistory hist;
-            out.lineedit("Enter new mode: ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new mode: ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             const char * start = selected.c_str();
             char * end = 0;
             select = strtol(start, &end, 10);
@@ -178,14 +179,14 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
         {
             CommandHistory hist;
             string selected;
-            out.lineedit("Enter new game mode number (c for exit): ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new game mode number (c for exit): ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             const char * start = selected.c_str();
             gm.g_mode = (GameMode) strtol(start, 0, 10);
-            out.lineedit("Enter new game type number (c for exit): ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new game type number (c for exit): ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             start = selected.c_str();
             gm.g_type = (GameType) strtol(start, 0, 10);
         }
diff --git a/plugins/tiletypes.cpp b/plugins/tiletypes.cpp
index 74fcbe1b9..1e3362b0b 100644
--- a/plugins/tiletypes.cpp
+++ b/plugins/tiletypes.cpp
@@ -984,9 +984,10 @@ command_result df_tiletypes (color_ostream &out_, vector <string> & parameters)
         printState(out);
 
         std::string input = "";
+        int rv = 0;
 
-        if (out.lineedit("tiletypes> ",input,tiletypes_hist) == -1)
-            return CR_FAILURE;
+        if ((rv = out.lineedit("tiletypes> ",input,tiletypes_hist)) < 0)
+            return rv == -2 ? CR_OK : CR_FAILURE;
         tiletypes_hist.add(input);
 
         commands.clear();