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#ifndef __SHAREMEM_H
#define __SHAREMEM_H
#include <windows.h>
#include <memory.h>
//
// allocate named shared memory
//
LPVOID smalloc(HANDLE *h, char *name, DWORD size)
{
LPVOID p;
*h = CreateFileMapping(
INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0,
size, name
);
if(*h==NULL) return(NULL);
p = MapViewOfFile( *h, FILE_MAP_WRITE, 0, 0, 0);
if(p==NULL)
{
CloseHandle(*h);
return(NULL);
}
return(p);
}
//
// open access to named shared memory
//
LPVOID smopen(HANDLE *h, char *name)
{
LPVOID p;
*h = OpenFileMapping(FILE_MAP_ALL_ACCESS, TRUE, name);
if(*h==NULL) return(NULL);
p = MapViewOfFile(*h, FILE_MAP_WRITE, 0, 0, 0);
if(p==NULL)
{
CloseHandle(*h);
return(NULL);
}
return(p);
}
//
// cleanup
//
void smfree(HANDLE *h, LPVOID p)
{
UnmapViewOfFile(p);
CloseHandle(*h);
}
#endif
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