fonts: Fix refcounting for asynchronous font operations (#3040)

When doing Xinerama, we'll dispatch font ops across all backend screens.
If using a font server (such that some operations can sleep), we'll put
the client to sleep once for each screen, but only wake up once, because
we're trying to keep track of the sleep count in _each_ screen's
closure.

Instead, just ask the core whether the client is already asleep.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 48 insertions, 53 deletions

diff --git a/dix/dixfonts.c b/dix/dixfonts.c
index 4a8f113ba..e22eabe3a 100644
--- a/dix/dixfonts.c
+++ b/dix/dixfonts.c
@@ -321,10 +321,10 @@ doOpenFont(ClientPtr client, OFclosurePtr c)
 	    continue;
 	}
 	if (err == Suspended) {
-	    if (!c->slept) {
-		c->slept = TRUE;
-		ClientSleep(client, (ClientSleepProcPtr)doOpenFont, (pointer) c);
-	    }
+	    if (!ClientIsAsleep(client))
+		ClientSleep(client, (ClientSleepProcPtr)doOpenFont, c);
+	    else
+		goto xinerama_sleep;
 	    return TRUE;
 	}
 	break;
@@ -373,8 +373,8 @@ bail:
 	SendErrorToClient(c->client, X_OpenFont, 0,
 			  c->fontid, FontToXError(err));
     }
-    if (c->slept)
-	ClientWakeup(c->client);
+    ClientWakeup(c->client);
+xinerama_sleep:
     for (i = 0; i < c->num_fpes; i++) {
 	FreeFPE(c->fpe_list[i]);
     }
@@ -460,7 +460,6 @@ OpenFont(ClientPtr client, XID fid, Mask flags, unsigned lenfname, char *pfontna
     c->current_fpe = 0;
     c->num_fpes = num_fpes;
     c->fnamelen = lenfname;
-    c->slept = FALSE;
     c->flags = flags;
     c->non_cachable_font = cached;
 
@@ -622,12 +621,12 @@ doListFontsAndAliases(ClientPtr client, LFclosurePtr c)
 		 c->names);
 
 	    if (err == Suspended) {
-		if (!c->slept) {
-		    c->slept = TRUE;
+		if (!ClientIsAsleep(client))
 		    ClientSleep(client,
-			(ClientSleepProcPtr)doListFontsAndAliases,
-			(pointer) c);
-		}
+				(ClientSleepProcPtr)doListFontsAndAliases,
+				c);
+		else
+		    goto xinerama_sleep;
 		return TRUE;
 	    }
 
@@ -650,12 +649,12 @@ doListFontsAndAliases(ClientPtr client, LFclosurePtr c)
 		     c->current.patlen, c->current.max_names - c->names->nnames,
 		     &c->current.private);
 		if (err == Suspended) {
-		    if (!c->slept) {
+		    if (!ClientIsAsleep(client))
 			ClientSleep(client,
 				    (ClientSleepProcPtr)doListFontsAndAliases,
-				    (pointer) c);
-			c->slept = TRUE;
-		    }
+				    c);
+		    else
+			goto xinerama_sleep;
 		    return TRUE;
 		}
 		if (err == Successful)
@@ -668,12 +667,12 @@ doListFontsAndAliases(ClientPtr client, LFclosurePtr c)
 		    ((pointer) c->client, fpe, &name, &namelen, &tmpname,
 		     &resolvedlen, c->current.private);
 		if (err == Suspended) {
-		    if (!c->slept) {
+		    if (ClientIsAsleep(client))
 			ClientSleep(client,
 				    (ClientSleepProcPtr)doListFontsAndAliases,
-				    (pointer) c);
-			c->slept = TRUE;
-		    }
+				    c);
+		    else
+			goto xinerama_sleep;
 		    return TRUE;
 		}
 		if (err == FontNameAlias) {
@@ -822,8 +821,8 @@ finish:
     free(bufferStart);
 
 bail:
-    if (c->slept)
-	ClientWakeup(client);
+    ClientWakeup(client);
+xinerama_sleep:
     for (i = 0; i < c->num_fpes; i++)
 	FreeFPE(c->fpe_list[i]);
     free(c->fpe_list);
@@ -881,7 +880,6 @@ ListFonts(ClientPtr client, unsigned char *pattern, unsigned length,
     c->current.list_started = FALSE;
     c->current.private = 0;
     c->haveSaved = FALSE;
-    c->slept = FALSE;
     c->savedName = 0;
     doListFontsAndAliases(client, c);
     return Success;
@@ -928,11 +926,11 @@ doListFontsWithInfo(ClientPtr client, LFWIclosurePtr c)
 		 c->current.max_names, &c->current.private);
 	    if (err == Suspended)
  	    {
-		if (!c->slept)
- 		{
-		    ClientSleep(client, (ClientSleepProcPtr)doListFontsWithInfo, c);
-		    c->slept = TRUE;
-		}
+		if (!ClientIsAsleep(client))
+		    ClientSleep(client,
+				(ClientSleepProcPtr)doListFontsWithInfo, c);
+		else
+		    goto xinerama_sleep;
 		return TRUE;
 	    }
 	    if (err == Successful)
@@ -947,13 +945,11 @@ doListFontsWithInfo(ClientPtr client, LFWIclosurePtr c)
 		 &numFonts, c->current.private);
 	    if (err == Suspended)
  	    {
-		if (!c->slept)
- 		{
+		if (!ClientIsAsleep(client))
 		    ClientSleep(client,
-		    	     (ClientSleepProcPtr)doListFontsWithInfo,
-			     c);
-		    c->slept = TRUE;
-		}
+				(ClientSleepProcPtr)doListFontsWithInfo, c);
+		else
+		    goto xinerama_sleep;
 		return TRUE;
 	    }
 	}
@@ -1098,8 +1094,8 @@ finish:
 		     - sizeof(xGenericReply));
     WriteSwappedDataToClient(client, length, &finalReply);
 bail:
-    if (c->slept)
-	ClientWakeup(client);
+    ClientWakeup(client);
+xinerama_sleep:
     for (i = 0; i < c->num_fpes; i++)
 	FreeFPE(c->fpe_list[i]);
     free(c->reply);
@@ -1154,7 +1150,6 @@ StartListFontsWithInfo(ClientPtr client, int length, unsigned char *pattern,
     c->current.private = 0;
     c->savedNumFonts = 0;
     c->haveSaved = FALSE;
-    c->slept = FALSE;
     c->savedName = 0;
     doListFontsWithInfo(client, c);
     return Success;
@@ -1181,7 +1176,7 @@ doPolyText(ClientPtr client, PTclosurePtr c)
 	fpe = c->pGC->font->fpe;
 	(*fpe_functions[fpe->type].client_died) ((pointer) client, fpe);
 
-	if (c->slept)
+	if (ClientIsAsleep(client))
 	{
 	    /* Client has died, but we cannot bail out right now.  We
 	       need to clean up after the work we did when going to
@@ -1198,7 +1193,7 @@ doPolyText(ClientPtr client, PTclosurePtr c)
     }
 
     /* Make sure our drawable hasn't disappeared while we slept. */
-    if (c->slept && c->pDraw)
+    if (ClientIsAsleep(client) && c->pDraw)
     {
 	DrawablePtr pDraw;
 	dixLookupDrawable(&pDraw, c->did, client, 0, DixWriteAccess);
@@ -1212,7 +1207,7 @@ doPolyText(ClientPtr client, PTclosurePtr c)
 	}
     }
 
-    client_state = c->slept ? SLEEPING : NEVER_SLEPT;
+    client_state = ClientIsAsleep(client) ? SLEEPING : NEVER_SLEPT;
 
     while (c->endReq - c->pElt > TextEltHeader)
     {
@@ -1295,7 +1290,7 @@ doPolyText(ClientPtr client, PTclosurePtr c)
 
 	    if (lgerr == Suspended)
 	    {
-		if (!c->slept) {
+		if (!ClientIsAsleep(client)) {
 		    int len;
 		    GC *pGC;
 		    PTclosurePtr new_closure;
@@ -1368,15 +1363,14 @@ doPolyText(ClientPtr client, PTclosurePtr c)
 		    c->pGC = pGC;
 		    ValidateGC(c->pDraw, c->pGC);
 		    
-		    c->slept = TRUE;
-		    ClientSleep(client,
-		    	     (ClientSleepProcPtr)doPolyText,
-			     (pointer) c);
+		    ClientSleep(client, (ClientSleepProcPtr)doPolyText, c);
 
 		    /* Set up to perform steps 3 and 4 */
 		    client_state = START_SLEEP;
 		    continue;	/* on to steps 3 and 4 */
 		}
+		else
+		    goto xinerama_sleep;
 		return TRUE;
 	    }
 	    else if (lgerr != Successful)
@@ -1419,9 +1413,10 @@ bail:
 #endif
 	    SendErrorToClient(c->client, c->reqType, 0, 0, err);
     }
-    if (c->slept)
+    if (ClientIsAsleep(client))
     {
 	ClientWakeup(c->client);
+xinerama_sleep:
 	ChangeGC(NullClient, c->pGC, clearGCmask, clearGC);
 
 	/* Unreference the font from the scratch GC */
@@ -1460,7 +1455,6 @@ PolyText(ClientPtr client, DrawablePtr pDraw, GC *pGC, unsigned char *pElt,
     local_closure.pGC = pGC;
     local_closure.did = did;
     local_closure.err = Success;
-    local_closure.slept = FALSE;
 
     (void) doPolyText(client, &local_closure);
     return Success;
@@ -1485,7 +1479,7 @@ doImageText(ClientPtr client, ITclosurePtr c)
     }
 
     /* Make sure our drawable hasn't disappeared while we slept. */
-    if (c->slept && c->pDraw)
+    if (ClientIsAsleep(client) && c->pDraw)
     {
 	DrawablePtr pDraw;
 	dixLookupDrawable(&pDraw, c->did, client, 0, DixWriteAccess);
@@ -1502,7 +1496,7 @@ doImageText(ClientPtr client, ITclosurePtr c)
     lgerr = LoadGlyphs(client, c->pGC->font, c->nChars, c->itemSize, c->data);
     if (lgerr == Suspended)
     {
-        if (!c->slept) {
+        if (!ClientIsAsleep(client)) {
 	    GC *pGC;
 	    unsigned char *data;
 	    ITclosurePtr new_closure;
@@ -1555,9 +1549,10 @@ doImageText(ClientPtr client, ITclosurePtr c)
 	    c->pGC = pGC;
 	    ValidateGC(c->pDraw, c->pGC);
 
-	    c->slept = TRUE;
-            ClientSleep(client, (ClientSleepProcPtr)doImageText, (pointer) c);
+            ClientSleep(client, (ClientSleepProcPtr)doImageText, c);
         }
+	else
+	    goto xinerama_sleep;
         return TRUE;
     }
     else if (lgerr != Successful)
@@ -1576,9 +1571,10 @@ bail:
     if (err != Success && c->client != serverClient) {
 	SendErrorToClient(c->client, c->reqType, 0, 0, err);
     }
-    if (c->slept)
+    if (ClientIsAsleep(client))
     {
 	ClientWakeup(c->client);
+xinerama_sleep:
 	ChangeGC(NullClient, c->pGC, clearGCmask, clearGC);
 
 	/* Unreference the font from the scratch GC */
@@ -1616,7 +1612,6 @@ ImageText(ClientPtr client, DrawablePtr pDraw, GC *pGC, int nChars,
 	local_closure.itemSize = 2;
     }
     local_closure.did = did;
-    local_closure.slept = FALSE;
 
     (void) doImageText(client, &local_closure);
     return Success;