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#ifndef SHARED_MEM_H
#define SHARED_MEM_H
class shared_mem {
static size_t shared_mem_size; // Size of shared memory allocations
struct data {
void *local_pointer;
int reference_count;
// Wait list
pid_t wait_next, wait_prev;
} *data;
// Who else shares this memory?
pid_t mem_next, mem_prev, us;
void release();
public:
shared_mem();
~shared_mem();
shared_mem( const shared_mem &rhs );
explicit shared_mem( void *ptr );
static void init_size( size_t size );
shared_mem &operator =( const shared_mem &rhs );
void *get() const { return data!=NULL ? data->local_pointer : NULL; }
char *getc() const { return (char *)get(); }
void set_pid( pid_t pid ) { us=pid; }
// Casts
operator bool() const { return data!=NULL && data->local_pointer!=NULL; }
};
#endif // SHARED_MEM_H
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