osb/source/core/StarLockFile.hpp

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#pragma once
2023-06-20 04:33:09 +00:00
#include "StarMaybe.hpp"
#include "StarString.hpp"
namespace Star {
class LockFile {
public:
// Convenience function, tries to acquire a lock, and if succesfull returns an
// already locked
// LockFile.
static Maybe<LockFile> acquireLock(String const& filename, int64_t lockTimeout = 1000);
LockFile(String const& filename);
LockFile(LockFile&& lockFile);
// Automatically unlocks.
~LockFile();
LockFile(LockFile const&) = delete;
LockFile& operator=(LockFile const&) = delete;
LockFile& operator=(LockFile&& lockFile);
// Wait at most timeout time to acquire the file lock, and return true if the
// lock was acquired. If timeout is negative, wait forever.
bool lock(int64_t timeout = 0);
void unlock();
bool isLocked() const;
private:
static int64_t const MaximumSleepMillis = 25;
String m_filename;
shared_ptr<void> m_handle;
};
}