91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/*
|
|
* Copyright (C) 2003-2014 The Music Player Daemon Project
|
|
* http://www.musicpd.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#ifndef MPD_BLOCKING_NFS_CALLBACK_HXX
|
|
#define MPD_BLOCKING_NFS_CALLBACK_HXX
|
|
|
|
#include "check.h"
|
|
#include "Callback.hxx"
|
|
#include "Lease.hxx"
|
|
#include "thread/Mutex.hxx"
|
|
#include "thread/Cond.hxx"
|
|
#include "util/Error.hxx"
|
|
|
|
class NfsConnection;
|
|
|
|
/**
|
|
* Utility class to implement a blocking NFS call using the libnfs
|
|
* async API. The actual method call is deferred to the #EventLoop
|
|
* thread, and method Run() waits for completion.
|
|
*/
|
|
class BlockingNfsOperation : protected NfsCallback, NfsLease {
|
|
static constexpr unsigned timeout_ms = 60000;
|
|
|
|
Mutex mutex;
|
|
Cond cond;
|
|
|
|
bool finished;
|
|
|
|
Error error;
|
|
|
|
protected:
|
|
NfsConnection &connection;
|
|
|
|
public:
|
|
BlockingNfsOperation(NfsConnection &_connection)
|
|
:finished(false), connection(_connection) {}
|
|
|
|
bool Run(Error &error);
|
|
|
|
private:
|
|
bool LockWaitFinished() {
|
|
const ScopeLock protect(mutex);
|
|
while (!finished)
|
|
if (!cond.timed_wait(mutex, timeout_ms))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Mark the operation as "finished" and wake up the waiting
|
|
* thread.
|
|
*/
|
|
void LockSetFinished() {
|
|
const ScopeLock protect(mutex);
|
|
finished = true;
|
|
cond.signal();
|
|
}
|
|
|
|
/* virtual methods from NfsLease */
|
|
void OnNfsConnectionReady() final;
|
|
void OnNfsConnectionFailed(const Error &error) final;
|
|
void OnNfsConnectionDisconnected(const Error &error) final;
|
|
|
|
/* virtual methods from NfsCallback */
|
|
void OnNfsCallback(unsigned status, void *data) final;
|
|
void OnNfsError(Error &&error) final;
|
|
|
|
protected:
|
|
virtual bool Start(Error &error) = 0;
|
|
virtual void HandleResult(unsigned status, void *data) = 0;
|
|
};
|
|
|
|
#endif
|