shm.h

Go to the documentation of this file.

 
#ifndef __SHM_H__
#define __SHM_H__
 
#include <stdint.h>
#include <process.h>
 
#define USER_SHARED_MEM_START 0x0000000080000000
 
/*
 * AuSHM -- shared memory segment
 */
typedef struct _shm_ {
    uint16_t key;
    uint16_t id;
    uint64_t num_frames;
    uint64_t* frames;
    uint16_t link_count;
}AuSHM;
typedef struct _shm_mapping_ {
    uint64_t start_addr;
    size_t length;
    AuSHM* shm;
}AuSHMMappings;
 
extern void AuInitialiseSHMMan(void);
 
/*
* AuGetSHMByID -- find a shared memory segment by ID
* @param id -- segment ID to search
*/
extern AuSHM* AuGetSHMByID(uint16_t id);
 
/* Kernel services holding a segment beyond any client mapping must retain
 * their own reference, then release it when removing that cached segment. */
extern void AuSHMRetain(AuSHM* shm);
extern void AuSHMRelease(AuSHM* shm);
 
extern int AuCreateSHM(AuProcess* proc, uint16_t key, size_t sz, uint8_t flags);
 
extern void* AuSHMObtainMem(AuProcess* proc, uint16_t id, void* shmaddr, int shmflg);
 
extern void AuSHMUnmap(uint16_t key, AuProcess* proc);
 
extern void AuSHMUnmapAll(AuProcess* proc);
 
#endif