EventFile.hxx

#pragma once
 
// Linux
#include <sys/eventfd.h>
 
// cosmos
#include <cosmos/BitMask.hxx>
#include <cosmos/fs/FDFile.hxx>
 
namespace cosmos {
 
 
class COSMOS_API EventFile :
                protected FDFile {
public: // types
 
        enum class Counter : uint64_t {};
 
        enum class Flag : int {
                CLOSE_ON_EXEC = EFD_CLOEXEC,  
                NONBLOCK      = EFD_NONBLOCK, 
                SEMAPHORE     = EFD_SEMAPHORE 
        };
 
        using Flags = BitMask<Flag>;
 
public: // functions
 
        explicit EventFile(const Counter initval = Counter{0}, const Flags flags = Flags{Flag::CLOSE_ON_EXEC});
 
        using FDFile::close;
        using FileBase::fd;
        using FileBase::isOpen;
 
 
        Counter wait();
 
 
        void signal(const Counter increment = Counter{1});
};
 
} // end ns