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xorg-x11-server/bug-211314_mesa-refcount-memleak-fixes.diff

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commit 42aaa548a1020be5d40b3dce9448d8004b1ef947
Author: Brian <brian@nostromo.localnet.net>
Date: Sun Mar 25 10:39:36 2007 -0600
Fix some renderbuffer reference counting issues. Also fixes a mem leak.
diff --git a/src/mesa/drivers/x11/xm_buffer.c b/src/mesa/drivers/x11/xm_buffer.c
index c1fa233..bb8fe31 100644
--- a/src/mesa/drivers/x11/xm_buffer.c
+++ b/src/mesa/drivers/x11/xm_buffer.c
@@ -422,18 +422,6 @@ xmesa_delete_framebuffer(struct gl_frame
XMesaDestroyImage( b->rowimage );
}
- /* Note that XMesaBuffer renderbuffers normally have a refcount of 2
- * (creation + binding) so we need to explicitly delete/unbind them here.
- */
- if (b->frontxrb) {
- _mesa_unreference_renderbuffer((struct gl_renderbuffer **) &b->frontxrb);
- ASSERT(b->frontxrb == NULL);
- }
- if (b->backxrb) {
- _mesa_unreference_renderbuffer((struct gl_renderbuffer **) &b->backxrb);
- ASSERT(b->backxrb == NULL);
- }
-
_mesa_free_framebuffer_data(fb);
_mesa_free(fb);
}
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index f7e870b..fefa14e 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -559,7 +559,7 @@ _mesa_IsRenderbufferEXT(GLuint renderbuf
void GLAPIENTRY
_mesa_BindRenderbufferEXT(GLenum target, GLuint renderbuffer)
{
- struct gl_renderbuffer *newRb, *oldRb;
+ struct gl_renderbuffer *newRb;
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
@@ -593,21 +593,16 @@ _mesa_BindRenderbufferEXT(GLenum target,
}
ASSERT(newRb->AllocStorage);
_mesa_HashInsert(ctx->Shared->RenderBuffers, renderbuffer, newRb);
+ newRb->RefCount = 1; /* referenced by hash table */
}
- newRb->RefCount++;
}
else {
newRb = NULL;
}
- oldRb = ctx->CurrentRenderbuffer;
- if (oldRb) {
- _mesa_unreference_renderbuffer(&oldRb);
- }
-
ASSERT(newRb != &DummyRenderbuffer);
- ctx->CurrentRenderbuffer = newRb;
+ _mesa_reference_renderbuffer(&ctx->CurrentRenderbuffer, newRb);
}
@@ -632,14 +627,15 @@ _mesa_DeleteRenderbuffersEXT(GLsizei n,
_mesa_BindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
}
- /* remove from hash table immediately, to free the ID */
+ /* Remove from hash table immediately, to free the ID.
+ * But the object will not be freed until it's no longer
+ * referenced anywhere else.
+ */
_mesa_HashRemove(ctx->Shared->RenderBuffers, renderbuffers[i]);
if (rb != &DummyRenderbuffer) {
- /* But the object will not be freed until it's no longer
- * bound in any context.
- */
- _mesa_unreference_renderbuffer(&rb);
+ /* no longer referenced by hash table */
+ _mesa_reference_renderbuffer(&rb, NULL);
}
}
}
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index cd4f594..1fd31a5 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -70,42 +70,6 @@ compute_depth_max(struct gl_framebuffer
/**
- * Set the framebuffer's _DepthBuffer field, taking care of
- * reference counts, etc.
- */
-static void
-set_depth_renderbuffer(struct gl_framebuffer *fb,
- struct gl_renderbuffer *rb)
-{
- if (fb->_DepthBuffer) {
- _mesa_unreference_renderbuffer(&fb->_DepthBuffer);
- }
- fb->_DepthBuffer = rb;
- if (rb) {
- rb->RefCount++;
- }
-}
-
-
-/**
- * Set the framebuffer's _StencilBuffer field, taking care of
- * reference counts, etc.
- */
-static void
-set_stencil_renderbuffer(struct gl_framebuffer *fb,
- struct gl_renderbuffer *rb)
-{
- if (fb->_StencilBuffer) {
- _mesa_unreference_renderbuffer(&fb->_StencilBuffer);
- }
- fb->_StencilBuffer = rb;
- if (rb) {
- rb->RefCount++;
- }
-}
-
-
-/**
* Create and initialize a gl_framebuffer object.
* This is intended for creating _window_system_ framebuffers, not generic
* framebuffer objects ala GL_EXT_framebuffer_object.
@@ -223,7 +187,7 @@ _mesa_free_framebuffer_data(struct gl_fr
for (i = 0; i < BUFFER_COUNT; i++) {
struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
if (att->Renderbuffer) {
- _mesa_unreference_renderbuffer(&att->Renderbuffer);
+ _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
}
if (att->Texture) {
/* render to texture */
@@ -239,9 +203,9 @@ _mesa_free_framebuffer_data(struct gl_fr
att->Texture = NULL;
}
- /* unbind depth/stencil to decr ref counts */
- set_depth_renderbuffer(fb, NULL);
- set_stencil_renderbuffer(fb, NULL);
+ /* unbind _Depth/_StencilBuffer to decr ref counts */
+ _mesa_reference_renderbuffer(&fb->_DepthBuffer, NULL);
+ _mesa_reference_renderbuffer(&fb->_StencilBuffer, NULL);
}
@@ -569,13 +533,13 @@ _mesa_update_depth_buffer(GLcontext *ctx
/* need to update wrapper */
struct gl_renderbuffer *wrapper
= _mesa_new_z24_renderbuffer_wrapper(ctx, depthRb);
- set_depth_renderbuffer(fb, wrapper);
+ _mesa_reference_renderbuffer(&fb->_DepthBuffer, wrapper);
ASSERT(fb->_DepthBuffer->Wrapped == depthRb);
}
}
else {
/* depthRb may be null */
- set_depth_renderbuffer(fb, depthRb);
+ _mesa_reference_renderbuffer(&fb->_DepthBuffer, depthRb);
}
}
@@ -610,13 +574,13 @@ _mesa_update_stencil_buffer(GLcontext *c
/* need to update wrapper */
struct gl_renderbuffer *wrapper
= _mesa_new_s8_renderbuffer_wrapper(ctx, stencilRb);
- set_stencil_renderbuffer(fb, wrapper);
+ _mesa_reference_renderbuffer(&fb->_StencilBuffer, wrapper);
ASSERT(fb->_StencilBuffer->Wrapped == stencilRb);
}
}
else {
/* stencilRb may be null */
- set_stencil_renderbuffer(fb, stencilRb);
+ _mesa_reference_renderbuffer(&fb->_StencilBuffer, stencilRb);
}
}
diff --git a/src/mesa/main/rbadaptors.c b/src/mesa/main/rbadaptors.c
index 60f4948..c1ac060 100644
--- a/src/mesa/main/rbadaptors.c
+++ b/src/mesa/main/rbadaptors.c
@@ -45,7 +45,7 @@ Delete_wrapper(struct gl_renderbuffer *r
/* Decrement reference count on the buffer we're wrapping and delete
* it if refcount hits zero.
*/
- _mesa_unreference_renderbuffer(&rb->Wrapped);
+ _mesa_reference_renderbuffer(&rb->Wrapped, NULL);
/* delete myself */
_mesa_delete_renderbuffer(rb);
diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c
index ded0063..49706b5 100644
--- a/src/mesa/main/renderbuffer.c
+++ b/src/mesa/main/renderbuffer.c
@@ -1473,7 +1473,7 @@ _mesa_init_renderbuffer(struct gl_render
rb->ClassID = 0;
rb->Name = name;
- rb->RefCount = 1;
+ rb->RefCount = 0;
rb->Delete = _mesa_delete_renderbuffer;
/* The rest of these should be set later by the caller of this function or
@@ -2105,9 +2105,7 @@ _mesa_add_renderbuffer(struct gl_framebu
fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
fb->Attachment[bufferName].Complete = GL_TRUE;
- fb->Attachment[bufferName].Renderbuffer = rb;
-
- rb->RefCount++;
+ _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
}
@@ -2125,38 +2123,55 @@ _mesa_remove_renderbuffer(struct gl_fram
if (!rb)
return;
- _mesa_unreference_renderbuffer(&rb);
+ _mesa_reference_renderbuffer(&rb, NULL);
fb->Attachment[bufferName].Renderbuffer = NULL;
}
/**
- * Decrement a renderbuffer object's reference count and delete it when
- * the refcount hits zero.
- * Note: we pass the address of a pointer.
+ * Set *ptr to point to rb. If *ptr points to another renderbuffer,
+ * dereference that buffer first. The new renderbuffer's refcount will
+ * be incremented. The old renderbuffer's refcount will be decremented.
*/
void
-_mesa_unreference_renderbuffer(struct gl_renderbuffer **rb)
+_mesa_reference_renderbuffer(struct gl_renderbuffer **ptr,
+ struct gl_renderbuffer *rb)
{
- assert(rb);
- if (*rb) {
+ assert(ptr);
+ if (*ptr == rb) {
+ /* no change */
+ return;
+ }
+
+ if (*ptr) {
+ /* Unreference the old renderbuffer */
GLboolean deleteFlag = GL_FALSE;
+ struct gl_renderbuffer *oldRb = *ptr;
- _glthread_LOCK_MUTEX((*rb)->Mutex);
- ASSERT((*rb)->RefCount > 0);
- (*rb)->RefCount--;
- deleteFlag = ((*rb)->RefCount == 0);
- _glthread_UNLOCK_MUTEX((*rb)->Mutex);
+ _glthread_LOCK_MUTEX(oldRb->Mutex);
+ ASSERT(oldRb->RefCount > 0);
+ oldRb->RefCount--;
+ /*printf("RB DECR %p to %d\n", (void*) oldRb, oldRb->RefCount);*/
+ deleteFlag = (oldRb->RefCount == 0);
+ _glthread_UNLOCK_MUTEX(oldRb->Mutex);
if (deleteFlag)
- (*rb)->Delete(*rb);
+ oldRb->Delete(oldRb);
- *rb = NULL;
+ *ptr = NULL;
}
-}
-
+ assert(!*ptr);
+ if (rb) {
+ /* reference new renderbuffer */
+ _glthread_LOCK_MUTEX(rb->Mutex);
+ rb->RefCount++;
+ /*printf("RB REF %p to %d\n", (void*)rb, rb->RefCount);*/
+ _glthread_UNLOCK_MUTEX(rb->Mutex);
+ *ptr = rb;
+ }
+}
/**
@@ -2180,4 +2195,3 @@ _mesa_new_depthstencil_renderbuffer(GLco
return dsrb;
}
-
diff --git a/src/mesa/main/renderbuffer.h b/src/mesa/main/renderbuffer.h
index e5f1147..c9bf888 100644
--- a/src/mesa/main/renderbuffer.h
+++ b/src/mesa/main/renderbuffer.h
@@ -102,7 +102,8 @@ extern void
_mesa_remove_renderbuffer(struct gl_framebuffer *fb, GLuint bufferName);
extern void
-_mesa_unreference_renderbuffer(struct gl_renderbuffer **rb);
+_mesa_reference_renderbuffer(struct gl_renderbuffer **ptr,
+ struct gl_renderbuffer *rb);
extern struct gl_renderbuffer *
_mesa_new_depthstencil_renderbuffer(GLcontext *ctx, GLuint name);
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