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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <map>
#include "mmap_access_mode.h"
namespace mmap_allocator_namespace {
class mmap_file_identifier {
public:
mmap_file_identifier();
mmap_file_identifier(const mmap_file_identifier &other);
mmap_file_identifier(std::string fname, enum access_mode access_mode);
bool operator==(const mmap_file_identifier &other) const;
bool operator<(const mmap_file_identifier &other) const;
private:
enum access_mode access_mode;
dev_t device;
ino_t inode;
};
class mmapped_file {
public:
mmapped_file():
fd(-1),
memory_area(NULL),
size_mapped(0),
offset_mapped(0),
reference_count(0)
{ }
void *get_memory_area(void)
{
return memory_area;
}
void* open_and_mmap_file(std::string fname, enum access_mode access_mode, off_t offset, size_t length, bool map_whole_file, bool allow_remap);
bool munmap_and_close_file(void);
private:
friend class mmap_file_pool;
int fd;
void *memory_area;
size_t size_mapped;
off_t offset_mapped;
int reference_count;
};
typedef std::map<mmap_file_identifier, mmapped_file> mmapped_file_map_t;
typedef std::pair<mmap_file_identifier, mmapped_file> mmapped_file_pair_t;
/* Singleton */
class mmap_file_pool {
public:
mmap_file_pool():
the_map()
{ }
void *mmap_file(std::string fname, enum access_mode access_mode, off_t offset, size_t length, bool map_whole_file, bool allow_remap);
void munmap_file(std::string fname, enum access_mode access_mode, off_t offset, size_t length);
private:
mmapped_file_map_t the_map;
};
extern mmap_file_pool the_pool;
}
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