+ : RefCountedGLsyncBase(locked_glFenceSync(condition, flags), glDeleteSync) {}
+
+private:
+ // These are to work around apitrace bug #446.
+ static GLsync locked_glFenceSync(GLenum condition, GLbitfield flags)
+ {
+ std::lock_guard<std::mutex> lock(fence_lock);
+ return glFenceSync(condition, flags);
+ }
+
+ static void locked_glDeleteSync(GLsync sync)
+ {
+ std::lock_guard<std::mutex> lock(fence_lock);
+ glDeleteSync(sync);
+ }
+
+ static std::mutex fence_lock;