Added clearing of callbacks on terminate.

src/init.c

@@ -150,6 +150,8 @@ GLFWAPI void glfwTerminate(void)
     if (!_glfwInitialized)
         return;
 
+    memset(&_glfw.callbacks, 0, sizeof(_glfw.callbacks));
+
     // Close all remaining windows
     while (_glfw.windowListHead)
         glfwDestroyWindow((GLFWwindow*) _glfw.windowListHead);

src/internal.h

@@ -304,7 +304,10 @@ struct _GLFWlibrary
 
     _GLFWmonitor**  monitors;
     int             monitorCount;
-    GLFWmonitorfun  monitorCallback;
+
+    struct {
+        GLFWmonitorfun  monitor;
+    } callbacks;
 
     // This is defined in the window API's platform.h
     _GLFW_PLATFORM_LIBRARY_WINDOW_STATE;

src/monitor.c

@@ -141,8 +141,8 @@ void _glfwInputMonitorChange(void)
                 window->monitor = NULL;
         }
 
-        if (_glfw.monitorCallback)
-            _glfw.monitorCallback((GLFWmonitor*) monitors[i], GLFW_DISCONNECTED);
+        if (_glfw.callbacks.monitor)
+            _glfw.callbacks.monitor((GLFWmonitor*) monitors[i], GLFW_DISCONNECTED);
     }
 
     // Find and report newly connected monitors (not in the old list)
@@ -163,8 +163,8 @@ void _glfwInputMonitorChange(void)
         if (j < monitorCount)
             continue;
 
-        if (_glfw.monitorCallback)
-            _glfw.monitorCallback((GLFWmonitor*) _glfw.monitors[i], GLFW_CONNECTED);
+        if (_glfw.callbacks.monitor)
+            _glfw.callbacks.monitor((GLFWmonitor*) _glfw.monitors[i], GLFW_CONNECTED);
     }
 
     _glfwDestroyMonitors(monitors, monitorCount);
@@ -326,7 +326,7 @@ GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* handle)
 GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
 {
     _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
-    _GLFW_SWAP_POINTERS(_glfw.monitorCallback, cbfun);
+    _GLFW_SWAP_POINTERS(_glfw.callbacks.monitor, cbfun);
     return cbfun;
 }