[iOS] Close all open databases in expiration handler of process assertion
https://bugs.webkit.org/show_bug.cgi?id=144661
<rdar://problem/20845052>
Reviewed by Darin Adler.
Source/WebCore:
Expose functionality in WebCore to close all open databases. Closing a SQLite database
will interrupt any in-progress database transactions.
- Modules/webdatabase/AbstractDatabaseServer.h:
- Modules/webdatabase/DatabaseManager.cpp:
(WebCore::DatabaseManager::closeAllDatabases): Added; turns around and calls DatabaseServer::closeAllDatabases().
- Modules/webdatabase/DatabaseManager.h: Export DatabaseManager::closeAllDatabases() so that
we can call in from WebKit2.
- Modules/webdatabase/DatabaseServer.cpp:
(WebCore::DatabaseServer::closeAllDatabases): Added; turns around and calls DatabaseTracker::closeAllDatabases().
- Modules/webdatabase/DatabaseServer.h:
- Modules/webdatabase/DatabaseTracker.cpp:
(WebCore::DatabaseTracker::closeAllDatabases): Added; closes all open databases.
- Modules/webdatabase/DatabaseTracker.h: Export DatabaseTracker::closeAllDatabases() so that
we can call in from Legacy WebKit.
Source/WebKit/mac:
For Legacy WebKit, close all open databases when the process assertion expiration
handler is called.
- Storage/WebDatabaseManager.mm:
(+[WebDatabaseManager startBackgroundTask]): Call DatabaseTracker::tracker().closeAllDatabases()
in the expiration handler to close all open databases. As a side effect of closing
a database all in-progress database transactions are interrupted.
Source/WebKit2:
For WebKit2, close all open databases when the process assertion expiration
handler is called.
When the process assertion expiration handler is called we dispatch a synchronous
message called ProcessWillSuspendImminently to the {Web, Network} processes to inform
them that they will be suspended imminently. The {Web, Network} process will always
service this message regardless if they were waiting for another message. In the
WebProcess, we will close all open databases among other tasks upon receiving this
message. In the NetworkProcess, we will purge some data from memory.
- NetworkProcess/NetworkProcess.cpp:
(WebKit::NetworkProcess::didReceiveSyncMessage): Modified to call NetworkProcess::didReceiveSyncNetworkProcessMessage()
to process the synchronous ProcessWillSuspendImminently message.
(WebKit::NetworkProcess::processWillSuspendImminently): Added; free some memory.
- NetworkProcess/NetworkProcess.h:
- NetworkProcess/NetworkProcess.messages.in: Added synchronous message ProcessWillSuspendImminently.
- Shared/ChildProcessProxy.h:
(WebKit::ChildProcessProxy::sendSync): Added parameter sendSyncFlags so that we can send
a sync message with flag IPC::InterruptWaitingIfSyncMessageArrives to cause the {Web, Network}Process
to process the message regardless of whether it is waiting for another message.
- UIProcess/Network/NetworkProcessProxy.cpp:
(WebKit::NetworkProcessProxy::sendProcessWillSuspendImminently): Added. Sends the message
ProcessWillSuspendImminently to the NetworkProcess.
- UIProcess/Network/NetworkProcessProxy.h:
- UIProcess/ProcessAssertion.cpp:
(WebKit::ProcessAndUIAssertion::setClient): Added.
- UIProcess/ProcessAssertion.h: Added abstract class ProcessAssertionClient.
(WebKit::ProcessAssertionClient::~ProcessAssertionClient): Added.
(WebKit::ProcessAssertion::setClient): Added.
(WebKit::ProcessAssertion::client): Added.
- UIProcess/ProcessThrottler.cpp:
(WebKit::ProcessThrottler::didConnectToProcess):
(WebKit::ProcessThrottler::assertionWillExpireImminently): Added; implements the ProcessAssertionClient
interface. Notify the process throttler clients that the assertion is near expiration.
- UIProcess/ProcessThrottler.h:
- UIProcess/ProcessThrottlerClient.h: Added
- UIProcess/WebProcessProxy.cpp:
(WebKit::WebProcessProxy::sendProcessWillSuspendImminently): Added. Sends the message
ProcessWillSuspendImminently to the WebProcess.
- UIProcess/WebProcessProxy.h:
- UIProcess/ios/ProcessAssertionIOS.mm:
(-[WKProcessAssertionBackgroundTaskManager addClient:]): Added.
(-[WKProcessAssertionBackgroundTaskManager removeClient:]): Added.
(-[WKProcessAssertionBackgroundTaskManager _updateBackgroundTask]): Modified expiration handler
to notify ProcessAssertionClient clients that the assertion is near expiration.
(WebKit::ProcessAssertion::~ProcessAssertion): Remove the client on destruction.
(WebKit::ProcessAndUIAssertion::setClient): Added.
- WebProcess/WebCoreSupport/WebDatabaseManager.cpp:
(WebKit::WebDatabaseManager::closeAllDatabases): Added; turns around and calls DatabaseManager::closeAllDatabases().
- WebProcess/WebCoreSupport/WebDatabaseManager.h:
- WebProcess/WebProcess.cpp:
(WebKit::WebProcess::didReceiveSyncMessage): Call WebProcess::didReceiveSyncWebProcessMessage() to process
the synchronous ProcessWillSuspendImminently message. Removed logging for an unhandled synchronous message
since WebProcess::didReceiveSyncWebProcessMessage() will ASSERT_NOT_REACHED() for such a message.
(WebKit::WebProcess::prepareToSuspend): Extracted code from WebProcess::processWillSuspend() so that it can
be used from both WebProcess::processWillSuspend() and WebProcess::processWillSuspendImminently(). And modified
it to conditionally dispatch a ProcessReadyToSuspend message to the WebProcessProxy. We only want to dispatch
such a message as part of a coordinated suspension by the ProcessThrottler. That is, we do not want to dispatch
the ProcessReadyToSuspend message when the background assertion is near expiration (i.e. WebProcess::processWillSuspendImminently()
is called).
(WebKit::WebProcess::processWillSuspendImminently): Added. Suspend all open databases among other tasks.
(WebKit::WebProcess::processWillSuspend): Implemented in terms of WebProcess::prepareToSuspend().
(WebKit::WebProcess::processSuspensionCleanupTimerFired): Modified to conditionally dispatch a ProcessReadyToSuspend
message to the WebProcessProxy.
(WebKit::WebProcess::processDidResume): Stop the suspension cleanup timer, which may be active if the WebProcess
did not mark all its graphics layers as volatile before process suspension.
- WebProcess/WebProcess.h:
- WebProcess/WebProcess.messages.in: Added synchronous message ProcessWillSuspendImminently.
