minix/servers/ds/store.h
Cristiano Giuffrida c5b309ff07 Merge of Wu's GSOC 09 branch (src.20090525.r4372.wu)
Main changes:
- COW optimization for safecopy.
- safemap, a grant-based interface for sharing memory regions between processes.
- Integration with safemap and complete rework of DS, supporting new data types
  natively (labels, memory ranges, memory mapped ranges).
- For further information:
  http://wiki.minix3.org/en/SummerOfCode2009/MemoryGrants

Additional changes not included in the original Wu's branch:
- Fixed unhandled case in VM when using COW optimization for safecopy in case
  of a block that has already been shared as SMAP.
- Better interface and naming scheme for sys_saferevmap and ds_retrieve_map
  calls.
- Better input checking in syslib: check for page alignment when creating
  memory mapping grants.
- DS notifies subscribers when an entry is deleted.
- Documented the behavior of indirect grants in case of memory mapping.
- Test suite in /usr/src/test/safeperf|safecopy|safemap|ds/* reworked
  and extended.
- Minor fixes and general cleanup.
- TO-DO: Grant ids should be generated and managed the way endpoints are to make
sure grant slots are never misreused.
2010-01-14 15:24:16 +00:00

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C

#ifndef _DS_STORE_H_
#define _DS_STORE_H_
/* Type definitions for the Data Store Server. */
#include <sys/types.h>
#include <minix/sys_config.h>
#include <minix/ds.h>
#include <minix/bitmap.h>
#include <regex.h>
#define NR_DS_KEYS 64 /* number of entries */
#define NR_DS_SUBS (4*_NR_SYS_PROCS) /* number of subscriptions */
#define NR_DS_SNAPSHOT 5 /* number of snapshots */
/* Base 'class' for the following 3 structs. */
struct data_store {
int flags;
char key[DS_MAX_KEYLEN]; /* key to lookup information */
char owner[DS_MAX_KEYLEN];
union {
unsigned u32;
char string[DS_MAX_STRLEN];
struct {
void *data;
size_t length;
size_t reallen;
} mem;
struct dsi_map {
void *data;
size_t length;
void *realpointer;
void *snapshots[NR_DS_SNAPSHOT];
int sindex;
} map;
} u;
};
struct subscription {
int flags;
char owner[DS_MAX_KEYLEN];
regex_t regex;
bitchunk_t old_subs[BITMAP_CHUNKS(NR_DS_KEYS)];
};
#endif /* _DS_STORE_H_ */