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mesa: Reads must also be done with lock held.

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Otherwise two threads might think each made the refcount go zero.

(cherry picked from master, commit 8bbb6b352a)
This commit is contained in:
Brian Paul 2009-03-06 07:51:18 -07:00
parent a22088b7d5
commit 6801240205
1 changed files with 5 additions and 3 deletions
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8
src/mesa/main/context.c
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@ -1293,6 +1293,8 @@ _mesa_create_context(const GLvisual *visual,
void
_mesa_free_context_data( GLcontext *ctx )
{
GLint RefCount;
if (!_mesa_get_current_context()){
/* No current context, but we may need one in order to delete
* texture objs, etc. So temporarily bind the context now.
@ -1342,10 +1344,10 @@ _mesa_free_context_data( GLcontext *ctx )
/* Shared context state (display lists, textures, etc) */
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
ctx->Shared->RefCount--;
assert(ctx->Shared->RefCount >= 0);
RefCount = --ctx->Shared->RefCount;
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
if (ctx->Shared->RefCount == 0) {
assert(RefCount >= 0);
if (RefCount == 0) {
/* free shared state */
free_shared_state( ctx, ctx->Shared );
}