wait_ops_linux.hpp

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#ifndef BOOST_FAIRNESS_WAIT_OPS_LINUX_HPP
#define BOOST_FAIRNESS_WAIT_OPS_LINUX_HPP
#include <boost/fairness/config.hpp>
#include <unistd.h>
#include <linux/futex.h>
#include <sys/syscall.h>
#include <limits.h>
 
namespace boost::fairness::detail{
 
    template<typename T, typename K>
    inline void wait_(T& mem, K expected){
        static_assert(sizeof(T) == 4, "Invalid argument size on boost::fairness::detail::wait");
        syscall(SYS_futex, &mem, FUTEX_WAIT_PRIVATE, expected, nullptr, nullptr, 0);
    }
 
    template<typename T>
    inline void notify_one_(T& mem){
        static_assert(sizeof(T) == 4, "Invalid argument size on boost::fairness::detail::notify_one");
        syscall(SYS_futex, &mem, FUTEX_WAKE_PRIVATE, 1, nullptr, nullptr, 0);
    }
 
    template<typename T>
    inline void notify_all_(T& mem){
        static_assert(sizeof(T) == 4, "Invalid argument size on boost::fairness::detail::notify_all");
        syscall(SYS_futex, &mem, FUTEX_WAKE_PRIVATE, INT_MAX, nullptr, nullptr, 0);
    }
 
}
 
#endif // BOOST_FAIRNESS_WAIT_OPS_LINUX_HPP