_atomic-mutex.h

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#ifndef _RWSTD_RW_ATOMIC_MUTEX_H_INCLUDED
#define _RWSTD_RW_ATOMIC_MUTEX_H_INCLUDED
 
 
#ifndef _RWSTD_RW_MUTEX_H_INCLUDED
#  include <rw/_mutex.h>
#endif   // _RWSTD_RW_MUTEX_H_INCLUDED
 
 
_RWSTD_NAMESPACE (__rw) {
    
// helper functions for atomic value [in|de]crement and exchange
// the functions are atomic with respect to each other as long as
// they are passed the same mutex by the callers
template <class _TypeT>
inline
_TypeT __rw_atomic_preincrement (_TypeT &__t, __rw_mutex_base &__mutex)
{
    _RWSTD_MT_GUARD (__mutex);
 
    return ++__t;
}
 
 
template <class _TypeT>
inline
_TypeT __rw_atomic_predecrement (_TypeT &__t, __rw_mutex_base &__mutex)
{
    _RWSTD_MT_GUARD (__mutex);
 
    return --__t;
}
 
 
template <class _TypeT, class _TypeU>
inline
_TypeT __rw_atomic_exchange (_TypeT &__t, const _TypeU &__u,
                             __rw_mutex_base &__mutex)
{
    _RWSTD_MT_GUARD (__mutex);
 
    _TypeT __tmp = __t;
 
#ifndef _WIN64
    __t = __u;
#else
    // silence MSVC conversion warnings (cast breaks SunPro 5.3 and prior)
    __t = _RWSTD_STATIC_CAST (_TypeT, __u);
#endif
 
    return __tmp;
}
 
 
// for use on class statics or on namespace-scope variables
// the unused argument is only here so that all functions
// can be called from the same set of macros
 
template <class _TypeT>
inline
_TypeT __rw_atomic_preincrement (_TypeT &__t, bool)
{
    return __rw_atomic_preincrement (__t,
                                     __rw_get_static_mutex ((_TypeT*)0));
}
 
 
template <class _TypeT>
inline
_TypeT __rw_atomic_predecrement (_TypeT &__t, bool)
{
    return __rw_atomic_predecrement (__t,
                                     __rw_get_static_mutex ((_TypeT*)0));
}
 
 
template <class _TypeT, class _TypeU>
inline
_TypeT __rw_atomic_exchange (_TypeT &__t, const _TypeU &__u, bool)
{
    return __rw_atomic_exchange (__t, __u,
                                 __rw_get_static_mutex ((_TypeT*)0));
}
 
}   // namespace __rw
 
#endif   // _RWSTD_RW_ATOMIC_MUTEX_H_INCLUDED