C++ protect函数代码示例

SCM Scm::loadFile(const QString& filename) {
    return protect(_load_file,(void*)filename.ascii());
}

v8::Local<v8::Value> ScriptController::callFunction(v8::Handle<v8::Function> function, v8::Handle<v8::Object> receiver, int argc, v8::Handle<v8::Value> args[])
{
    // Keep Frame (and therefore ScriptController) alive.
    RefPtr<Frame> protect(m_frame);
    return ScriptController::callFunctionWithInstrumentation(m_frame ? m_frame->document() : 0, function, receiver, argc, args);
}

QString QsCodeMarker::markedUpCode( const QString& code,
				    const Node * /* relative */,
				    const QString& /* dirPath */ )
{
    return protect( code );
}

 /**
  * Determine the value of the flag, and set it before returning.
  */
 bool GetAndSet(bool new_value=true) {
   ScopeLock protect(mutex);
   bool old_value = value;
   value = new_value;
   return old_value;
 }

// In this method, we can clear |request| to tell content::WebURLLoaderImpl of
// Chromium not to follow the redirect. This works only when this method is
// called by RawResource::willSendRequest(). If called by
// RawResource::didAddClient(), clearing |request| won't be propagated
// to content::WebURLLoaderImpl. So, this loader must also get detached from
// the resource by calling clearResource().
void DocumentThreadableLoader::redirectReceived(Resource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    ASSERT(m_client);
    ASSERT_UNUSED(resource, resource == this->resource());
    ASSERT(m_async);

    if (!m_actualRequest.isNull()) {
        reportResponseReceived(resource->identifier(), redirectResponse);

        handlePreflightFailure(redirectResponse.url().string(), "Response for preflight is invalid (redirect)");
        // |this| may be dead here.

        request = ResourceRequest();

        return;
    }

    if (m_redirectMode == WebURLRequest::FetchRedirectModeManual) {
        // Keep |this| alive even if the client release a reference in
        // responseReceived().
        RefPtr<DocumentThreadableLoader> protect(this);

        // We use |m_redirectMode| to check the original redirect mode.
        // |request| is a new request for redirect. So we don't set the redirect
        // mode of it in WebURLLoaderImpl::Context::OnReceivedRedirect().
        ASSERT(request.useStreamOnResponse());
        // There is no need to read the body of redirect response because there
        // is no way to read the body of opaque-redirect filtered response's
        // internal response.
        // TODO(horo): If we support any API which expose the internal body, we
        // will have to read the body. And also HTTPCache changes will be needed
        // because it doesn't store the body of redirect responses.
        responseReceived(resource, redirectResponse, adoptPtr(new EmptyDataHandle()));

        if (m_client) {
            ASSERT(m_actualRequest.isNull());
            notifyFinished(resource);
        }

        request = ResourceRequest();

        return;
    }

    if (m_redirectMode == WebURLRequest::FetchRedirectModeError || !isAllowedByContentSecurityPolicy(request.url(), ContentSecurityPolicy::DidRedirect)) {
        ThreadableLoaderClient* client = m_client;
        clear();
        client->didFailRedirectCheck();
        // |this| may be dead here.

        request = ResourceRequest();

        return;
    }

    // Allow same origin requests to continue after allowing clients to audit the redirect.
    if (isAllowedRedirect(request.url())) {
        if (m_client->isDocumentThreadableLoaderClient())
            static_cast<DocumentThreadableLoaderClient*>(m_client)->willFollowRedirect(request, redirectResponse);
        return;
    }

    if (m_corsRedirectLimit <= 0) {
        ThreadableLoaderClient* client = m_client;
        clear();
        client->didFailRedirectCheck();
        // |this| may be dead here.
    } else if (m_options.crossOriginRequestPolicy == UseAccessControl) {
        --m_corsRedirectLimit;

        InspectorInstrumentation::didReceiveCORSRedirectResponse(document().frame(), resource->identifier(), document().frame()->loader().documentLoader(), redirectResponse, 0);

        bool allowRedirect = false;
        String accessControlErrorDescription;

        // Non-simple cross origin requests (both preflight and actual one) are
        // not allowed to follow redirect.
        if (m_crossOriginNonSimpleRequest) {
            accessControlErrorDescription = "The request was redirected to '"+ request.url().string() + "', which is disallowed for cross-origin requests that require preflight.";
        } else {
            // The redirect response must pass the access control check if the
            // original request was not same-origin.
            allowRedirect = CrossOriginAccessControl::isLegalRedirectLocation(request.url(), accessControlErrorDescription)
                && (m_sameOriginRequest || passesAccessControlCheck(redirectResponse, effectiveAllowCredentials(), securityOrigin(), accessControlErrorDescription, m_requestContext));
        }

        if (allowRedirect) {
            // FIXME: consider combining this with CORS redirect handling performed by
            // CrossOriginAccessControl::handleRedirect().
            clearResource();

            RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::create(redirectResponse.url());
            RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::create(request.url());
            // If the original request wasn't same-origin, then if the request URL origin is not same origin with the original URL origin,
//.........这里部分代码省略.........

void ResourceLoader::willSendRequestInternal(ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    // Protect this in this delegate method since the additional processing can do
    // anything including possibly derefing this; one example of this is Radar 3266216.
    Ref<ResourceLoader> protect(*this);

    ASSERT(!m_reachedTerminalState);
#if ENABLE(CONTENT_EXTENSIONS)
    ASSERT(m_resourceType != ResourceType::Invalid);
#endif

    // We need a resource identifier for all requests, even if FrameLoader is never going to see it (such as with CORS preflight requests).
    bool createdResourceIdentifier = false;
    if (!m_identifier) {
        m_identifier = m_frame->page()->progress().createUniqueIdentifier();
        createdResourceIdentifier = true;
    }

#if ENABLE(CONTENT_EXTENSIONS)
    if (frameLoader()) {
        Page* page = frameLoader()->frame().page();
        if (page && m_documentLoader) {
            auto* userContentController = page->userContentController();
            if (userContentController)
                userContentController->processContentExtensionRulesForLoad(*page, request, m_resourceType, *m_documentLoader);
        }
    }
#endif

    if (request.isNull()) {
        didFail(cannotShowURLError());
        return;
    }

    if (m_options.sendLoadCallbacks() == SendCallbacks) {
        if (createdResourceIdentifier)
            frameLoader()->notifier().assignIdentifierToInitialRequest(m_identifier, documentLoader(), request);

#if PLATFORM(IOS)
        // If this ResourceLoader was stopped as a result of assignIdentifierToInitialRequest, bail out
        if (m_reachedTerminalState)
            return;
#endif

        frameLoader()->notifier().willSendRequest(this, request, redirectResponse);
    }
    else
        InspectorInstrumentation::willSendRequest(m_frame.get(), m_identifier, m_frame->loader().documentLoader(), request, redirectResponse);

    bool isRedirect = !redirectResponse.isNull();
    if (isRedirect)
        platformStrategies()->loaderStrategy()->resourceLoadScheduler()->crossOriginRedirectReceived(this, request.url());

    m_request = request;

    if (isRedirect) {
        auto& redirectURL = request.url();
        if (!m_documentLoader->isCommitted())
            frameLoader()->client().dispatchDidReceiveServerRedirectForProvisionalLoad();

        if (redirectURL.protocolIsData()) {
            // Handle data URL decoding locally.
            finishNetworkLoad();
            loadDataURL();
        }
    }
}

void
TrackingGlue::WaitStopped()
{
  ScopeLock protect(mutex);
  StandbyThread::WaitStopped();
}

bool MetaTranslator::save( const QString& filename ) const
{
    QFile f( filename );
    if ( !f.open(IO_WriteOnly) )
	return FALSE;

    QTextStream t( &f );
    t.setCodec( QTextCodec::codecForName("ISO-8859-1") );

    t << "<!DOCTYPE TS><TS>\n";
    if ( codecName != "ISO-8859-1" )
	t << "<defaultcodec>" << codecName << "</defaultcodec>\n";
    TMM::ConstIterator m = mm.begin();
    while ( m != mm.end() ) {
	TMMInv inv;
	TMMInv::Iterator i;
	bool contextIsUtf8 = m.key().utf8();
	QCString context = m.key().context();
	QCString comment = "";

	do {
	    if ( QCString(m.key().sourceText()) == ContextComment ) {
		if ( m.key().type() != MetaTranslatorMessage::Obsolete ) {
		    contextIsUtf8 = m.key().utf8();
		    comment = QCString( m.key().comment() );
		}
	    } else {
		inv.insert( *m, m.key() );
	    }
	} while ( ++m != mm.end() && QCString(m.key().context()) == context );

	t << "<context";
	if ( contextIsUtf8 )
	    t << " encoding=\"UTF-8\"";
	t << ">\n";
	t << "    <name>" << evilBytes( context, contextIsUtf8 )
	  << "</name>\n";
	if ( !comment.isEmpty() )
	    t << "    <comment>" << evilBytes( comment, contextIsUtf8 )
	      << "</comment>\n";

	for ( i = inv.begin(); i != inv.end(); ++i ) {
	    // no need for such noise
	    if ( (*i).type() == MetaTranslatorMessage::Obsolete &&
		 (*i).translation().isEmpty() )
		continue;

	    t << "    <message";
	    if ( (*i).utf8() )
		t << " encoding=\"UTF-8\"";
	    t << ">\n"
	      << "        <source>" << evilBytes( (*i).sourceText(),
						  (*i).utf8() )
	      << "</source>\n";
	    if ( !QCString((*i).comment()).isEmpty() )
		t << "        <comment>" << evilBytes( (*i).comment(),
						       (*i).utf8() )
		  << "</comment>\n";
	    t << "        <translation";
	    if ( (*i).type() == MetaTranslatorMessage::Unfinished )
		t << " type=\"unfinished\"";
	    else if ( (*i).type() == MetaTranslatorMessage::Obsolete )
		t << " type=\"obsolete\"";
	    t << ">" << protect( (*i).translation().utf8() )
	      << "</translation>\n";
	    t << "    </message>\n";
	}
	t << "</context>\n";
    }
    t << "</TS>\n";
    f.close();
    return TRUE;
}

void Notification::stopLoading()
{
    m_iconData = 0;
    RefPtr<ThreadableLoader> protect(m_loader);
    m_loader->cancel();
}

void
Logger::ClearBuffer()
{
  Poco::ScopedRWLock protect(lock, true);
  logger.ClearBuffer();
}

/**
 * Make the current environment persistent
 * @param[in] filename where to store
 * @param[in] dirname what to store (all files in this dir)
 * @param[in] flags superblock flags (refer ENVFS_FLAGS_* macros)
 * @return 0 on success, anything else in case of failure
 *
 * Note: This function will also be used on the host! See note in the header
 * of this file.
 */
int envfs_save(const char *filename, const char *dirname, unsigned flags)
{
	struct envfs_super *super;
	int envfd, size, ret;
	struct action_data data = {};
	void *buf = NULL, *wbuf;
	struct envfs_entry *env;

	if (!filename)
		filename = default_environment_path_get();

	if (!dirname)
		dirname = "/env";

	data.writep = NULL;
	data.base = dirname;

#ifdef __BAREBOX__
	defaultenv_load(TMPDIR, 0);
#endif

	if (flags & ENVFS_FLAGS_FORCE_BUILT_IN) {
		size = 0; /* force no content */
	} else {
		/* first pass: calculate size */
		recursive_action(dirname, ACTION_RECURSE, file_action,
				NULL, &data, 0);
		recursive_action("/.defaultenv", ACTION_RECURSE,
				file_remove_action, NULL, &data, 0);
		size = 0;

		for (env = data.env; env; env = env->next) {
			size += PAD4(env->size);
			size += sizeof(struct envfs_inode);
			size += PAD4(strlen(env->name) + 1);
			size += sizeof(struct envfs_inode_end);
		}
	}

	buf = xzalloc(size + sizeof(struct envfs_super));
	data.writep = buf + sizeof(struct envfs_super);

	super = buf;
	super->magic = ENVFS_32(ENVFS_MAGIC);
	super->major = ENVFS_MAJOR;
	super->minor = ENVFS_MINOR;
	super->size = ENVFS_32(size);
	super->flags = ENVFS_32(flags);

	if (!(flags & ENVFS_FLAGS_FORCE_BUILT_IN)) {
		/* second pass: copy files to buffer */
		env = data.env;
		while (env) {
			struct envfs_entry *next = env->next;

			envfs_save_inode(&data, env);

			free(env->buf);
			free(env->name);
			free(env);
			env = next;
		}
	}

	super->crc = ENVFS_32(crc32(0, buf + sizeof(struct envfs_super), size));
	super->sb_crc = ENVFS_32(crc32(0, buf, sizeof(struct envfs_super) - 4));

	envfd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
	if (envfd < 0) {
		printf("could not open %s: %s\n", filename, errno_str());
		ret = -errno;
		goto out1;
	}

	ret = protect(envfd, ~0, 0, 0);

	/* ENOSYS and EOPNOTSUPP aren't errors here, many devices don't need it */
	if (ret && errno != ENOSYS && errno != EOPNOTSUPP) {
		printf("could not unprotect %s: %s\n", filename, errno_str());
		goto out;
	}

	ret = erase(envfd, ~0, 0);

	/* ENOSYS and EOPNOTSUPP aren't errors here, many devices don't need it */
	if (ret && errno != ENOSYS && errno != EOPNOTSUPP) {
		printf("could not erase %s: %s\n", filename, errno_str());
		goto out;
	}

//.........这里部分代码省略.........

bool
DeviceDescriptor::IsAlive() const
{
  ScopeLock protect(device_blackboard->mutex);
  return device_blackboard->RealState(index).alive;
}

void PluginStream::destroyStream()
{
    if (m_streamState == StreamStopped)
        return;

    ASSERT(m_reason != WebReasonNone);
    ASSERT(!m_deliveryData || m_deliveryData->size() == 0);

    closeFile(m_tempFileHandle);

    bool newStreamCalled = m_stream.ndata;

    // Protect from destruction if:
    //  NPN_DestroyStream is called from NPP_NewStream or
    //  PluginStreamClient::streamDidFinishLoading() removes the last reference
    RefPtr<PluginStream> protect(this);

    if (newStreamCalled) {
        if (m_reason == NPRES_DONE && (m_transferMode == NP_ASFILE || m_transferMode == NP_ASFILEONLY)) {
            ASSERT(!m_path.isNull());

            if (m_loader)
                m_loader->setDefersLoading(true);
            m_pluginFuncs->asfile(m_instance, &m_stream, m_path.utf8().data());
            if (m_loader)
                m_loader->setDefersLoading(false);
        }

        if (m_streamState != StreamBeforeStarted) {
            if (m_loader)
                m_loader->setDefersLoading(true);

            NPError npErr = m_pluginFuncs->destroystream(m_instance, &m_stream, m_reason);

            if (m_loader)
                m_loader->setDefersLoading(false);

            LOG_NPERROR(npErr);
        }

        m_stream.ndata = 0;
    }

    if (m_sendNotification) {
        // Flash 9 can dereference null if we call NPP_URLNotify without first calling NPP_NewStream
        // for requests made with NPN_PostURLNotify; see <rdar://5588807>
        if (m_loader)
            m_loader->setDefersLoading(true);
        if (!newStreamCalled && m_quirks.contains(PluginQuirkFlashURLNotifyBug) &&
            equalIgnoringCase(m_resourceRequest.httpMethod(), "POST")) {
            m_transferMode = NP_NORMAL;
            m_stream.url = "";
            m_stream.notifyData = m_notifyData;

            static char emptyMimeType[] = "";
            m_pluginFuncs->newstream(m_instance, emptyMimeType, &m_stream, false, &m_transferMode);
            m_pluginFuncs->destroystream(m_instance, &m_stream, m_reason);

            // in successful requests, the URL is dynamically allocated and freed in our
            // destructor, so reset it to 0
            m_stream.url = 0;
        }
        m_pluginFuncs->urlnotify(m_instance, m_resourceRequest.url().string().utf8().data(), m_reason, m_notifyData);
        if (m_loader)
            m_loader->setDefersLoading(false);
    }

    m_streamState = StreamStopped;

    if (!m_loadManually && m_client)
        m_client->streamDidFinishLoading(this);

    if (!m_path.isNull())
        deleteFile(m_path);
}

unsigned
RasterWeather::GetParameter() const
{
  Poco::ScopedRWLock protect(lock, false);
  return _parameter;
}

QString JavaCodeMarker::markedUpEnumValue(const QString &enumValue,
                                          const Node * /* relative */)
{
    return protect(enumValue);
}