dom/workers/Principal.cpp
author Dave Townsend <dtownsend@oxymoronical.com>
Wed, 06 Feb 2019 11:09:06 -0800
changeset 520643 fbef638149b4426032f58903a9abf480341a3ff8
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
child 528572 39a877972476f803ab949b2ef56a588881252c19
permissions -rw-r--r--
Bug 1518639: Add boilerplate support for a windows remote client and server. r=jimm,froydnj Adds build config and stubs for a windows implementation of the remote client and server. Differential Revision: https://phabricator.services.mozilla.com/D19074

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "Principal.h"

#include "jsapi.h"
#include "mozilla/Assertions.h"

namespace mozilla {
namespace dom {

struct WorkerPrincipal final : public JSPrincipals {
  bool write(JSContext* aCx, JSStructuredCloneWriter* aWriter) override {
    MOZ_CRASH("WorkerPrincipal::write not implemented");
    return false;
  }
};

JSPrincipals* GetWorkerPrincipal() {
  static WorkerPrincipal sPrincipal;

  /*
   * To make sure the the principals refcount is initialized to one, atomically
   * increment it on every pass though this function. If we discover this wasn't
   * the first time, decrement it again. This avoids the need for
   * synchronization.
   */
  int32_t prevRefcount = sPrincipal.refcount++;
  if (prevRefcount > 0) {
    --sPrincipal.refcount;
  } else {
#ifdef DEBUG
    sPrincipal.debugToken = workerinternals::kJSPrincipalsDebugToken;
#endif
  }

  return &sPrincipal;
}

void DestroyWorkerPrincipals(JSPrincipals* aPrincipals) {
  MOZ_ASSERT_UNREACHABLE(
      "Worker principals refcount should never fall below one");
}

}  // namespace dom
}  // namespace mozilla