patch 7.4.866

Problem:    Crash when changing the 'tags' option from a remote command.
            (Benjamin Fritz)
Solution:   Instead of executing messages immediately, use a queue, like for
            netbeans. (James Kolb)

src/ex_docmd.c

@@ -9033,11 +9033,11 @@ do_sleep(msec)
     {
 	ui_delay(msec - done > 1000L ? 1000L : msec - done, TRUE);
 	ui_breakcheck();
-#ifdef FEAT_NETBEANS_INTG
-	/* Process the netbeans messages that may have been received in the
-	 * call to ui_breakcheck() when the GUI is in use. This may occur when
-	 * running a test case. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	/* Process the netbeans and clientserver messages that may have been
+	 * received in the call to ui_breakcheck() when the GUI is in use. This
+	 * may occur when running a test case. */
+	parse_queued_messages();
 #endif
     }
 }

src/getchar.c

@@ -3034,9 +3034,8 @@ inchar(buf, maxlen, wait_time, tb_change_cnt)
 	    )
     {
 
-#if defined(FEAT_NETBEANS_INTG)
-	/* Process the queued netbeans messages. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	parse_queued_messages();
 #endif
 
 	if (got_int || (script_char = getc(scriptin[curscript])) < 0)

src/gui_gtk_x11.c

@@ -650,7 +650,7 @@ property_event(GtkWidget *widget,
 	xev.xproperty.atom = commProperty;
 	xev.xproperty.window = commWindow;
 	xev.xproperty.state = PropertyNewValue;
-	serverEventProc(GDK_WINDOW_XDISPLAY(widget->window), &xev);
+	serverEventProc(GDK_WINDOW_XDISPLAY(widget->window), &xev, 0);
     }
     return FALSE;
 }
@@ -5476,9 +5476,8 @@ gui_mch_wait_for_chars(long wtime)
 	    focus = gui.in_focus;
 	}
 
-#if defined(FEAT_NETBEANS_INTG)
-	/* Process any queued netbeans messages. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	parse_queued_messages();
 #endif
 
 	/*

src/gui_w48.c

@@ -2016,9 +2016,8 @@ gui_mch_wait_for_chars(int wtime)
 	    s_need_activate = FALSE;
 	}
 
-#ifdef FEAT_NETBEANS_INTG
-	/* Process the queued netbeans messages. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	parse_queued_messages();
 #endif
 
 	/*

src/gui_x11.c

@@ -2895,9 +2895,8 @@ gui_mch_wait_for_chars(wtime)
 	    focus = gui.in_focus;
 	}
 
-#if defined(FEAT_NETBEANS_INTG)
-	/* Process any queued netbeans messages. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	parse_queued_messages();
 #endif
 
 	/*
@@ -3199,7 +3198,7 @@ gui_x11_send_event_handler(w, client_data, event, dum)
     if (e->type == PropertyNotify && e->window == commWindow
 	    && e->atom == commProperty &&  e->state == PropertyNewValue)
     {
-	serverEventProc(gui.dpy, event);
+	serverEventProc(gui.dpy, event, 0);
     }
 }
 #endif

src/if_xcmdsrv.c

@@ -169,6 +169,19 @@ enum ServerReplyOp { SROP_Find, SROP_Add, SROP_Delete };
 
 typedef int (*EndCond) __ARGS((void *));
 
+struct x_cmdqueue
+{
+    char_u		*propInfo;
+    int			len;
+    struct x_cmdqueue	*next;
+    struct x_cmdqueue	*prev;
+};
+
+typedef struct x_cmdqueue x_queue_T;
+
+/* dummy node, header for circular queue */
+static x_queue_T head = {NULL, 0, NULL, NULL};
+
 /*
  * Forward declarations for procedures defined later in this file:
  */
@@ -186,6 +199,8 @@ static struct ServerReply *ServerReplyFind __ARGS((Window w, enum ServerReplyOp
 static int	AppendPropCarefully __ARGS((Display *display, Window window, Atom property, char_u *value, int length));
 static int	x_error_check __ARGS((Display *dpy, XErrorEvent *error_event));
 static int	IsSerialName __ARGS((char_u *name));
+static void	save_in_queue __ARGS((char_u *buf, int len));
+static void	server_parse_message __ARGS((Display *dpy, char_u *propInfo, int numItems));
 
 /* Private variables for the "server" functionality */
 static Atom	registryProperty = None;
@@ -595,7 +610,7 @@ ServerWait(dpy, w, endCond, endData, localLoop, seconds)
     while (TRUE)
     {
 	while (XCheckWindowEvent(dpy, commWindow, PropertyChangeMask, &event))
-	    serverEventProc(dpy, &event);
+	    serverEventProc(dpy, &event, 1);
 
 	if (endCond(endData) != 0)
 	    break;
@@ -1127,22 +1142,25 @@ GetRegProp(dpy, regPropp, numItemsp, domsg)
     return OK;
 }
 
+
 /*
  * This procedure is invoked by the various X event loops throughout Vims when
  * a property changes on the communication window.  This procedure reads the
- * property and handles command requests and responses.
+ * property and enqueues command requests and responses. If immediate is true,
+ * it runs the event immediatly instead of enqueuing it. Immediate can cause
+ * unintended behavior and should only be used for code that blocks for a
+ * response.
  */
     void
-serverEventProc(dpy, eventPtr)
+serverEventProc(dpy, eventPtr, immediate)
     Display	*dpy;
     XEvent	*eventPtr;	/* Information about event. */
+    int		immediate;	/* Run event immediately. Should mostly be 0. */
 {
     char_u	*propInfo;
-    char_u	*p;
-    int		result, actualFormat, code;
+    int		result, actualFormat;
     long_u	numItems, bytesAfter;
     Atom	actualType;
-    char_u	*tofree;
 
     if (eventPtr != NULL)
     {
@@ -1168,6 +1186,87 @@ serverEventProc(dpy, eventPtr)
 	    XFree(propInfo);
 	return;
     }
+    if (immediate)
+	server_parse_message(dpy, propInfo, numItems);
+    else
+	save_in_queue(propInfo, numItems);
+}
+
+/*
+ * Saves x clientserver commands in a queue so that they can be called when
+ * vim is idle.
+ */
+    static void
+save_in_queue(propInfo, len)
+    char_u  *propInfo;
+    int	    len;
+{
+    x_queue_T *node;
+
+    node = (x_queue_T *)alloc(sizeof(x_queue_T));
+    if (node == NULL)
+	return;	    /* out of memory */
+    node->propInfo = propInfo;
+    node->len = len;
+
+    if (head.next == NULL)   /* initialize circular queue */
+    {
+	head.next = &head;
+	head.prev = &head;
+    }
+
+    /* insert node at tail of queue */
+    node->next = &head;
+    node->prev = head.prev;
+    head.prev->next = node;
+    head.prev = node;
+}
+
+/*
+ * Parses queued clientserver messages.
+ */
+    void
+server_parse_messages()
+{
+    char_u	*p;
+    x_queue_T	*node;
+
+    if (!X_DISPLAY)
+	return; /* cannot happen? */
+    while (head.next != NULL && head.next != &head)
+    {
+	node = head.next;
+	server_parse_message(X_DISPLAY, node->propInfo, node->len);
+	head.next = node->next;
+	node->next->prev = node->prev;
+	vim_free(node);
+    }
+}
+
+/*
+ * Returns a non-zero value if there are clientserver messages waiting
+ * int the queue.
+ */
+    int
+server_waiting()
+{
+    return head.next != NULL && head.next != &head;
+}
+
+/*
+ * Prases a single clientserver message. A single message may contain multiple
+ * commands.
+ * "propInfo" will be freed.
+ */
+    static void
+server_parse_message(dpy, propInfo, numItems)
+    Display	*dpy;
+    char_u	*propInfo; /* A string containing 0 or more X commands */
+    int		numItems;  /* The size of propInfo in bytes. */
+{
+    char_u	*p;
+    int		code;
+    char_u	*tofree;
 
     /*
      * Several commands and results could arrive in the property at

src/macros.h

@@ -321,3 +321,7 @@
 #else
 # define PLINES_NOFILL(x) plines(x)
 #endif
+
+#if defined(FEAT_NETBEANS_INTG) || defined(FEAT_CLIENTSERVER)
+# define MESSAGE_QUEUE
+#endif

src/misc2.c

@@ -6328,3 +6328,23 @@ has_non_ascii(s)
     return FALSE;
 }
 #endif
+
+#if defined(MESSAGE_QUEUE) || defined(PROTO)
+/*
+ * Process messages that have been queued for netbeans or clientserver.
+ * These functions can call arbitrary vimscript and should only be called when
+ * it is safe to do so.
+ */
+    void
+parse_queued_messages()
+{
+# ifdef FEAT_NETBEANS_INTG
+    /* Process the queued netbeans messages. */
+    netbeans_parse_messages();
+# endif
+# ifdef FEAT_CLIENTSERVER
+    /* Process the queued clientserver messages. */
+    server_parse_messages();
+# endif
+}
+#endif

src/os_unix.c

@@ -388,9 +388,8 @@ mch_inchar(buf, maxlen, wtime, tb_change_cnt)
 {
     int		len;
 
-#ifdef FEAT_NETBEANS_INTG
-    /* Process the queued netbeans messages. */
-    netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+    parse_queued_messages();
 #endif
 
     /* Check if window changed size while we were busy, perhaps the ":set
@@ -405,9 +404,8 @@ mch_inchar(buf, maxlen, wtime, tb_change_cnt)
 	    if (!do_resize)	/* return if not interrupted by resize */
 		return 0;
 	    handle_resize();
-#ifdef FEAT_NETBEANS_INTG
-	    /* Process the queued netbeans messages. */
-	    netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	    parse_queued_messages();
 #endif
 	}
     }
@@ -439,9 +437,8 @@ mch_inchar(buf, maxlen, wtime, tb_change_cnt)
 	while (do_resize)    /* window changed size */
 	    handle_resize();
 
-#ifdef FEAT_NETBEANS_INTG
-	/* Process the queued netbeans messages. */
-	netbeans_parse_messages();
+#ifdef MESSAGE_QUEUE
+	parse_queued_messages();
 #endif
 	/*
 	 * We want to be interrupted by the winch signal
@@ -5208,6 +5205,7 @@ WaitForChar(msec)
  * When a GUI is being used, this will not be used for input -- webb
  * Returns also, when a request from Sniff is waiting -- toni.
  * Or when a Linux GPM mouse event is waiting.
+ * Or when a clientserver message is on the queue.
  */
 #if defined(__BEOS__)
     int
@@ -5601,6 +5599,11 @@ select_eintr:
 	if (finished || msec == 0)
 	    break;
 
+# ifdef FEAT_CLIENTSERVER
+	if (server_waiting())
+	    break;
+# endif
+
 	/* We're going to loop around again, find out for how long */
 	if (msec > 0)
 	{
@@ -7121,7 +7124,7 @@ xterm_update()
 
 		if (e->type == PropertyNotify && e->window == commWindow
 		   && e->atom == commProperty && e->state == PropertyNewValue)
-                serverEventProc(xterm_dpy, &event);
+		    serverEventProc(xterm_dpy, &event, 0);
 	    }
 #endif
 	    XtDispatchEvent(&event);

src/proto/if_xcmdsrv.pro

@@ -7,5 +7,7 @@ Window serverStrToWin __ARGS((char_u *str));
 int serverSendReply __ARGS((char_u *name, char_u *str));
 int serverReadReply __ARGS((Display *dpy, Window win, char_u **str, int localLoop));
 int serverPeekReply __ARGS((Display *dpy, Window win, char_u **str));
-void serverEventProc __ARGS((Display *dpy, XEvent *eventPtr));
+void serverEventProc __ARGS((Display *dpy, XEvent *eventPtr, int immediate));
+void server_parse_messages __ARGS((void));
+int server_waiting __ARGS((void));
 /* vim: set ft=c : */

src/proto/misc2.pro

@@ -106,4 +106,5 @@ int put_bytes __ARGS((FILE *fd, long_u nr, int len));
 void put_time __ARGS((FILE *fd, time_t the_time));
 void time_to_bytes __ARGS((time_t the_time, char_u *buf));
 int has_non_ascii __ARGS((char_u *s));
+void parse_queued_messages __ARGS((void));
 /* vim: set ft=c : */

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    866,
 /**/
     865,
 /**/