forked from mirrors/gecko-dev
098bc1f91c
CryptoTask is a helper class that makes it easier to implement code that runs on a background thread and then notifies completion on the main thread (this is useful for not blocking the main thread with long-running cryptography or I/O). Before this patch, each CryptoTask would create a new thread each time it ran, which was inefficient. This patch updates CryptoTask to use the stream transport service (which is essentially a pool of threads for doing exactly these kinds of things and notably is not to be confused with the socket transport service) to run each task. Additionally, there were a few places in PSM where we unnecessarily created new threads to perform similar tasks. These now use the stream transport service as well. Differential Revision: https://phabricator.services.mozilla.com/D33534 --HG-- extra : moz-landing-system : lando
43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CryptoTask.h"
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#include "nsNSSComponent.h"
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#include "nsNetCID.h"
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namespace mozilla {
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nsresult CryptoTask::Dispatch() {
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// Ensure that NSS is initialized, since presumably CalculateResult
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// will use NSS functions
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if (!EnsureNSSInitializedChromeOrContent()) {
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return NS_ERROR_FAILURE;
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}
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// The stream transport service (note: not the socket transport service) can
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// be used to perform background tasks or I/O that would otherwise block the
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// main thread.
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nsCOMPtr<nsIEventTarget> target(
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do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID));
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if (!target) {
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return NS_ERROR_FAILURE;
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}
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return target->Dispatch(this, NS_DISPATCH_NORMAL);
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}
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NS_IMETHODIMP
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CryptoTask::Run() {
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if (!NS_IsMainThread()) {
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mRv = CalculateResult();
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NS_DispatchToMainThread(this);
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} else {
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// back on the main thread
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CallCallback(mRv);
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}
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return NS_OK;
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}
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} // namespace mozilla
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