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-rw-r--r--cache.c35
1 files changed, 22 insertions, 13 deletions
diff --git a/cache.c b/cache.c
index 0ffa502..2e1ef8c 100644
--- a/cache.c
+++ b/cache.c
@@ -61,26 +61,35 @@ int cache_create_dirs()
61 return 1; 61 return 1;
62} 62}
63 63
64int cache_refill_overdue(const char *lockfile)
65{
66 struct stat st;
67
68 if (stat(lockfile, &st))
69 return 0;
70 else
71 return (time(NULL) - st.st_mtime > cgit_cache_max_create_time);
72}
73
64int cache_lock(struct cacheitem *item) 74int cache_lock(struct cacheitem *item)
65{ 75{
66 int ret; 76 int i = 0;
67 char *lockfile = fmt("%s.lock", item->name); 77 char *lockfile = fmt("%s.lock", item->name);
68 78
69 top: 79 top:
70 item->fd = open(lockfile, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR|S_IWUSR); 80 if (++i > cgit_max_lock_attempts)
81 die("cache_lock: unable to lock %s: %s",
82 item->name, strerror(errno));
83
84 item->fd = open(lockfile, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
85
71 if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs()) 86 if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs())
72 goto top; 87 goto top;
73 if (item->fd == NOLOCK && errno == EEXIST) { 88
74 struct stat st; 89 if (item->fd == NOLOCK && errno == EEXIST &&
75 time_t t; 90 cache_refill_overdue(lockfile) && !unlink(lockfile))
76 if (stat(lockfile, &st))
77 return ret;
78 t = time(NULL);
79 if (t-st.st_mtime > cgit_cache_max_create_time &&
80 !unlink(lockfile))
81 goto top; 91 goto top;
82 return 0; 92
83 }
84 return (item->fd > 0); 93 return (item->fd > 0);
85} 94}
86 95