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42d7a7bcef
This fixes the potential edge case where a frozen then unfrozen qTox instance could have its locks delete by a new qTox instance. We now check that we still own our locks, restoring them if we can, before saving
47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
#ifndef PROFILELOCKER_H
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#define PROFILELOCKER_H
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#include <QLockFile>
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#include <memory>
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/// Locks a Tox profile so that multiple instances can not use the same profile.
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/// Only one lock can be acquired at the same time, which means
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/// that there is little need for manually unlocking.
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/// The current lock will expire if you exit or acquire a new one.
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class ProfileLocker
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{
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private:
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ProfileLocker()=delete;
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public:
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/// Checks if a profile is currently locked by *another* instance
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/// If we own the lock, we consider it lockable
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/// There is no guarantee that the result will still be valid by the
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/// time it is returned, this is provided on a best effort basis
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static bool isLockable(QString profile);
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/// Tries to acquire the lock on a profile, will not block
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/// Returns true if we already own the lock
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static bool lock(QString profile);
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/// Releases the lock on the current profile
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static void unlock();
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/// Releases all locks on all profiles
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/// DO NOT call unless all we're the only qTox instance
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/// and we don't hold any lock yet.
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static void clearAllLocks();
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/// Check that we actually own the lock
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/// In case the file was deleted on disk, restore it
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/// If we can't get a lock, exit qTox immediately
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/// If we never had a lock in the firt place, exit immediately
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static void assertLock();
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private:
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static QString lockPathFromName(const QString& name);
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static void deathByBrokenLock(); ///< Print an error then exit immediately
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private:
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static std::unique_ptr<QLockFile> lockfile;
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static QString curLockName;
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};
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#endif // PROFILELOCKER_H
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