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1234757: XInitThreads needs to be made less restrictive

This is a RFE to enhance XInitThreads so that it may be called:

    * By libraries used by the client, (without the client's intervention)
    * At a later time, after other Xlib calls have already been made. 
      Currently, XInitThreads *Must* be the first Xlib call that the client 
      makes.

For Example, in order for XIL 1.3 to be MT HOT, it must be able to
make the call to XInitThreads, even if the client has already made
other Xlib calls.

--- libX11-1.7.2/include/X11/Xlibint.h
+++ libX11-1.7.2/include/X11/Xlibint.h
@@ -209,6 +209,10 @@ XIOErrorExitHandler exit_handler;
 	void *exit_handler_data;
 };
 
+#if defined(XTHREADS) && defined(SUNSOFT)
+int  InitDisplayArrayLock(void);
+#endif /* XTHREADS && SUNSOFT */
+
 #define XAllocIDs(dpy,ids,n) (*(dpy)->idlist_alloc)(dpy,ids,n)
 
 /*
--- libX11-1.7.2/src/OpenDis.c
+++ libX11-1.7.2/src/OpenDis.c
@@ -38,6 +38,21 @@ #ifdef XKB
 #include "XKBlib.h"
 #endif /* XKB */
 
+#if defined(XTHREADS) && defined(SUNSOFT)
+struct _DisplayPtrLink {
+    Display *dpy;
+    struct _DisplayPtrLink *next;
+};
+
+typedef struct _DisplayPtrLink DisplayPtrLink;
+DisplayPtrLink *HeadDisplay=NULL;
+DisplayPtrLink *LastDisplay=NULL;
+
+static int  AddToDisplayLink(Display *dpy);
+static void RemoveFromDisplayLink(Display *dpy);
+
+#endif /* XTHREADS && SUNSOFT */
+
 #ifdef XTHREADS
 #include "locking.h"
 int  (*_XInitDisplayLock_fn)(Display *dpy) = NULL;
@@ -211,6 +226,13 @@ OutOfMemory (dpy);
 		return(NULL);
 	}
 
+#ifdef XTHREADS
+        if (AddToDisplayLink(dpy) == 0) {
+                OutOfMemory (dpy);
+                return(NULL);
+        }
+#endif XTHREADS
+
 	if (!_XPollfdCacheInit(dpy)) {
 	        OutOfMemory (dpy);
 		return(NULL);
@@ -579,6 +601,10 @@ */
 
 void _XFreeDisplayStructure(Display *dpy)
 {
+#ifdef XTHREADS
+        RemoveFromDisplayLink(dpy);
+#endif XTHREADS
+
 	/* move all cookies in the EQ to the jar, then free them. */
 	if (dpy->qfree) {
 	    _XQEvent *qelt = dpy->qfree;
@@ -699,6 +725,103 @@ _XFreeX11XCBStructure(dpy);
 	Xfree (dpy);
 }
 
+#if defined(XTHREADS) && defined(SUNSOFT)
+static int
+AddToDisplayLink(Display *dpy)
+{
+    if ( dpy->lock )
+        return 1;
+
+/*
+ * Attempt to allocate a display array. Return NULL if allocation fails.
+ */
+    if ( !HeadDisplay ) {
+        HeadDisplay = Xcalloc (1, sizeof(struct _DisplayPtrLink));
+        if (HeadDisplay == NULL)
+            return 0;
+
+        HeadDisplay->dpy = dpy;
+        HeadDisplay->next = NULL;
+        LastDisplay = HeadDisplay;
+        return 1;
+    }
+
+    LastDisplay->next = Xcalloc (1, sizeof(struct _DisplayPtrLink));
+    if (LastDisplay->next == NULL )
+        return 0;
+
+    LastDisplay = LastDisplay->next;
+    LastDisplay->dpy = dpy;
+    LastDisplay->next = NULL;
+    return 1;
+}
+
+static void
+RemoveFromDisplayLink(Display *dpy)
+{
+    DisplayPtrLink *tmp_display  = HeadDisplay;
+    DisplayPtrLink *prev_display = HeadDisplay;
+
+    if ( dpy->lock )
+        return;
+
+    while ( tmp_display ) {
+        if ((tmp_display->dpy == dpy) && (tmp_display->dpy->fd == dpy->fd)){
+            break;
+        }
+
+        prev_display = tmp_display;
+        tmp_display = tmp_display->next;
+    }
+
+    /* Node not found */
+    if ( !tmp_display )
+        return;
+
+    /* If tmp_display is the first node */
+    if ( tmp_display == HeadDisplay ) {
+        if ( HeadDisplay->next )
+            HeadDisplay = HeadDisplay->next;
+        else {
+            HeadDisplay = NULL;
+            LastDisplay = NULL;
+        }
+    }
+    /* If tmp_display is the last node */
+    else if ( tmp_display == LastDisplay )  {
+        LastDisplay = prev_display;
+        LastDisplay->next = NULL;
+    }
+    /* tmp_display is in the middle of list*/
+    else
+        prev_display->next = tmp_display->next;
+
+    Xfree(tmp_display);
+    return;
+}
+
+int
+InitDisplayArrayLock(void)
+{
+    DisplayPtrLink *tmp_display  = HeadDisplay;
+    DisplayPtrLink *prev_display = HeadDisplay;
+
+    while ( tmp_display ) {
+        if ((tmp_display->dpy) && (!tmp_display->dpy->lock)) {
+            /* Initialize the display lock */
+            if (_XInitDisplayLock_fn(tmp_display->dpy) != 0) {
+                OutOfMemory (tmp_display->dpy);
+                return 0;
+            }
+        }
+        tmp_display = tmp_display->next;
+    }
+
+    return 1;
+}
+
+#endif /* XTHREADS && SUNSOFT */
+
 /* OutOfMemory is called if malloc fails.  XOpenDisplay returns NULL
    after this returns. */
 
--- libX11-1.7.2/src/locking.c
+++ libX11-1.7.2/src/locking.c
@@ -640,6 +640,11 @@ setlinebuf(stdout);		/* for debugging me
 #endif
 #endif
 
+#ifdef SUNSOFT
+    if (InitDisplayArrayLock() == 0)
+        return 0;
+#endif
+
     return 1;
 }