Mesa (master): glapi: Fix a race in accessing context/dispatch TSD.

[Brian Paul]

Module: Mesa
Branch: master
Commit: fc2feea685d86c520fb01199caa5a46eae20c7aa
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc2feea685d86c520fb01199caa5a46eae20c7aa

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Fri Jul 10 17:35:11 2009 +0800

glapi: Fix a race in accessing context/dispatch TSD.

If multiple threads set/get a TSD at roughly same time for the first
time, glthread might (wrongly) initialize it more than once.  This patch
solves the race by initializing context/dispatch TSDs early.

Acked-by: Ian Romanick <ian.d.romanick at intel.com>
Signed-off-by: Chia-I Wu <olvaffe at gmail.com>

---

 src/mesa/glapi/glapi.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/glapi/glapi.c b/src/mesa/glapi/glapi.c
index 30aec20..b9ab9c0 100644
--- a/src/mesa/glapi/glapi.c
+++ b/src/mesa/glapi/glapi.c
@@ -240,6 +240,10 @@ _glapi_check_multithread(void)
 
    _glthread_LOCK_MUTEX(ThreadCheckMutex);
    if (firstCall) {
+      /* initialize TSDs */
+      (void) _glthread_GetTSD(&ContextTSD);
+      (void) _glthread_GetTSD(&_gl_DispatchTSD);
+
       knownID = _glthread_GetID();
       firstCall = GL_FALSE;
    }