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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
include/pal/shm.hpp
Abstract:
C++ typesafe accessors for shared memory routines
--*/
#ifndef _SHM_HPP_
#define _SHM_HPP_
#include "shmemory.h"
//
// Some compilers (e.g., HPUX/IA64) warn about using NULL to initialize
// something of type SHMPTR, since SHMPTR is defined as DWORD_PTR, which
// isn't considered a pointer type...
//
#define SHMNULL 0
#ifndef _DEBUG
inline
void *
ShmPtrToPtrFast(SHMPTR shmptr)
{
void *pv = NULL;
if (SHMNULL != shmptr)
{
int segment = shmptr >> 24;
if (segment < shm_numsegments)
{
pv = reinterpret_cast<void*>(
reinterpret_cast<DWORD_PTR>(shm_segment_bases[(uint)segment].Load())
+ (shmptr & 0x00FFFFFF)
);
}
else
{
pv = SHMPtrToPtr(shmptr);
}
}
return pv;
}
//
// We could use a function template here to avoid the cast / macro
//
#define SHMPTR_TO_TYPED_PTR(type, shmptr) reinterpret_cast<type*>(ShmPtrToPtrFast((shmptr)))
#else
#define SHMPTR_TO_TYPED_PTR(type, shmptr) reinterpret_cast<type*>(SHMPtrToPtr((shmptr)))
#endif
/* Set ptr to NULL if shmPtr == 0, else set ptr to SHMPTR_TO_TYPED_PTR(type, shmptr)
return FALSE if SHMPTR_TO_TYPED_PTR returns NULL ptr from non null shmptr,
TRUE otherwise */
#define SHMPTR_TO_TYPED_PTR_BOOL(type, ptr, shmptr) \
((shmptr != 0) ? ((ptr = SHMPTR_TO_TYPED_PTR(type, shmptr)) != NULL) : ((ptr = NULL) == NULL))
#endif // _SHM_HPP_
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