From: José Fonseca <jfonseca@vmware.com>
Date: Fri, 1 May 2009 17:52:54 +0000 (+0100)
Subject: mesa: Make _mesa_share_state thread safe.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b25168c34c60760a33ca9e8336ac76cf1219f143;p=mesa.git

mesa: Make _mesa_share_state thread safe.
---

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 1a290f251ad..ddbc631e674 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1394,14 +1394,21 @@ _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
 {
    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
       struct gl_shared_state *oldSharedState = ctx->Shared;
+      GLint RefCount;
 
       ctx->Shared = ctxToShare->Shared;
+      
+      _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
       ctx->Shared->RefCount++;
+      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 
       update_default_objects(ctx);
 
-      oldSharedState->RefCount--;
-      if (oldSharedState->RefCount == 0) {
+      _glthread_LOCK_MUTEX(oldSharedState->Mutex);
+      RefCount = --oldSharedState->RefCount;
+      _glthread_UNLOCK_MUTEX(oldSharedState->Mutex);
+
+      if (RefCount == 0) {
          _mesa_free_shared_state(ctx, oldSharedState);
       }