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