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Don't truncate valid cachefiles

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An embarrassing thinko in cgit_check_cache() would truncate valid cachefiles
in the following situation:
  1) process A notices a missing/expired cachefile
  2) process B gets scheduled, locks, fills and unlocks the cachefile
  3) process A gets scheduled, locks the cachefile, notices that the cachefile
     now exist/is not expired anymore, and continues to overwrite it with an
     empty lockfile.

Thanks to Linus for noticing (again).

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
This commit is contained in:
Lars Hjemli 2006-12-11 22:53:50 +01:00
parent 44923f8953
commit fbaf1171b4
3 changed files with 16 additions and 4 deletions
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cgit.h
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@ -66,6 +66,7 @@ extern int cgit_parse_query(char *txt, configfn fn);
extern void cache_prepare(struct cacheitem *item);
extern int cache_lock(struct cacheitem *item);
extern int cache_unlock(struct cacheitem *item);
extern int cache_cancel_lock(struct cacheitem *item);
extern int cache_exist(struct cacheitem *item);
extern int cache_expired(struct cacheitem *item);