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Add sequence numbers to game state (experimental)

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This catches output dependency violations, e.g. two threads doing a
read-modify-write without synchronization.

New struct emptypedstr member seqno.  Make sure all members of unit
empobj_storage share it.  Set it in ef_blank() and ef_set_uid(), step
it in ef_write().  fairland and files don't use ef_set_uid(); need to
set it manually in files.c's main() and file_sct_init().

Factor do_read() out of fillcache() to make it available for
new get_seqno().
This commit is contained in:
Markus Armbruster 2008-03-21 14:22:07 +01:00 • committed by Markus Armbruster
parent 2aec870a14
commit dc9d847b8b
20 changed files with 124 additions and 18 deletions
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2
include/file.h
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@ -67,6 +67,7 @@ struct empfile {
struct emptypedstr {
short ef_type;
short uid;
unsigned seqno;
time_t timestamp;
};
@ -187,6 +188,7 @@ extern int ef_close(int);
extern int ef_flush(int);
extern void ef_blank(int, int, void *);
extern int ef_write(int, int, void *);
extern void ef_set_uid(int, void *, int);
extern int ef_extend(int, int);
extern int ef_ensure_space(int, int, int);
extern int ef_truncate(int, int);