FileLock.hpp

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#pragma once
 
#include "AstGlobal.h"
#include "AstUtil/StringView.hpp"
#include <string>
#include <memory>           // for std::unique_ptr<FileLock::Impl>
#include <type_traits>
 
AST_NAMESPACE_BEGIN
 
class AST_UTIL_API FileLock
{
public:
    enum ELockMode
    {
        eExclusive,         
        eShared,            
    };
 
    enum ELockResult
    {
        eLocked=0,          
        eBusy=eErrorBusy,   
        eError=-1,          
    };
public:
    explicit FileLock(StringView path);
 
    ~FileLock();
 
    A_DISABLE_COPY(FileLock)
 
    
    errc_t lock(ELockMode mode = ELockMode::eExclusive);
 
    errc_t tryLock(ELockMode mode = ELockMode::eExclusive);
 
    errc_t tryLock(double timeoutSeconds, ELockMode mode = ELockMode::eExclusive);
 
    errc_t unlock();
private:
    class Impl;
    Impl& impl();
private:
    std::aligned_storage<sizeof(void*)>::type impl_{};
};
 
 
AST_NAMESPACE_END