Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "Principal.h"
       8             : 
       9             : #include "jsapi.h"
      10             : #include "mozilla/Assertions.h"
      11             : 
      12             : BEGIN_WORKERS_NAMESPACE
      13             : 
      14           1 : struct WorkerPrincipal final : public JSPrincipals
      15             : {
      16           0 :   bool write(JSContext* aCx, JSStructuredCloneWriter* aWriter) override {
      17           0 :     MOZ_CRASH("WorkerPrincipal::write not implemented");
      18             :     return false;
      19             :   }
      20             : };
      21             : 
      22             : JSPrincipals*
      23           1 : GetWorkerPrincipal()
      24             : {
      25           1 :   static WorkerPrincipal sPrincipal;
      26             : 
      27             :   /*
      28             :    * To make sure the the principals refcount is initialized to one, atomically
      29             :    * increment it on every pass though this function. If we discover this wasn't
      30             :    * the first time, decrement it again. This avoids the need for
      31             :    * synchronization.
      32             :    */
      33           1 :   int32_t prevRefcount = sPrincipal.refcount++;
      34           1 :   if (prevRefcount > 0) {
      35           0 :     --sPrincipal.refcount;
      36             :   } else {
      37             : #ifdef DEBUG
      38           1 :     sPrincipal.debugToken = kJSPrincipalsDebugToken;
      39             : #endif
      40             :   }
      41             : 
      42           1 :   return &sPrincipal;
      43             : }
      44             : 
      45             : void
      46           0 : DestroyWorkerPrincipals(JSPrincipals* aPrincipals)
      47             : {
      48           0 :   MOZ_ASSERT_UNREACHABLE("Worker principals refcount should never fall below one");
      49             : }
      50             : 
      51             : END_WORKERS_NAMESPACE