3 files changed, 31 insertions, 14 deletions

diff --git a/cache.c b/cache.c
index 0ffa502..2e1ef8c 100644
--- a/cache.c
+++ b/cache.c
@@ -56,36 +56,45 @@ int cache_create_dirs()
 		path = fmt("%s/%s/%s", cgit_cache_root, cgit_query_repo, 
 			   cgit_query_page);
 		if (mkdir(path, S_IRWXU) && errno!=EEXIST)
 			return 0;
 	}
 	return 1;
 }
 
+int cache_refill_overdue(const char *lockfile)
+{
+	struct stat st;
+
+	if (stat(lockfile, &st))
+		return 0;
+	else
+		return (time(NULL) - st.st_mtime > cgit_cache_max_create_time);
+}
+
 int cache_lock(struct cacheitem *item)
 {
-	int ret;
+	int i = 0;
 	char *lockfile = fmt("%s.lock", item->name);
 
- top:  
-       	item->fd = open(lockfile, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR|S_IWUSR);
+ top:
+	if (++i > cgit_max_lock_attempts)
+		die("cache_lock: unable to lock %s: %s",
+		    item->name, strerror(errno));
+
+       	item->fd = open(lockfile, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
+
 	if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs())
 		goto top;
-	if (item->fd == NOLOCK && errno == EEXIST) {
-		struct stat st;
-		time_t t;
-		if (stat(lockfile, &st))
-			return ret;
-		t = time(NULL);
-		if (t-st.st_mtime > cgit_cache_max_create_time && 
-		    !unlink(lockfile))
+
+	if (item->fd == NOLOCK && errno == EEXIST &&
+	    cache_refill_overdue(lockfile) && !unlink(lockfile))
 			goto top;
-		return 0;
-	}
+
 	return (item->fd > 0);
 }
 
 int cache_unlock(struct cacheitem *item)
 {
 	close(item->fd);
 	return (rename(fmt("%s.lock", item->name), item->name) == 0);
 }
diff --git a/cgit.c b/cgit.c
index 7f14016..dc91125 100644
--- a/cgit.c
+++ b/cgit.c
@@ -26,16 +26,17 @@ char *cgit_root         = "/usr/src/git";
 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";
 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
 char *cgit_virtual_root = NULL;
 
 char *cgit_cache_root   = "/var/cache/cgit";
 
+int cgit_max_lock_attempts     =  5;
 int cgit_cache_root_ttl        =  5;
 int cgit_cache_repo_ttl        =  5;
 int cgit_cache_dynamic_ttl     =  5;
 int cgit_cache_static_ttl      = -1;
 int cgit_cache_max_create_time =  5;
 
 char *cgit_repo_name    = NULL;
 char *cgit_repo_desc    = NULL;
@@ -460,21 +461,27 @@ static void cgit_fill_cache(struct cacheitem *item)
 	if (cgit_query_repo)
 		cgit_print_repo_page();
 	else
 		cgit_print_repolist();
 }
 
 static void cgit_refresh_cache(struct cacheitem *item)
 {
+	int i = 0;
+
 	cache_prepare(item);
  top:
+	if (++i > cgit_max_lock_attempts) {
+		die("cgit_refresh_cache: unable to lock %s: %s",
+		    item->name, strerror(errno));
+	}
 	if (!cache_exist(item)) {
 		if (!cache_lock(item)) {
-			sched_yield();
+			sleep(1);
 			goto top;
 		}
 		if (!cache_exist(item))
 			cgit_fill_cache(item);
 		cache_unlock(item);
 	} else if (cache_expired(item) && cache_lock(item)) {
 		if (cache_expired(item))
 			cgit_fill_cache(item);
diff --git a/cgit.h b/cgit.h
index 3b0994a..7e4bfef 100644
--- a/cgit.h
+++ b/cgit.h
@@ -18,16 +18,17 @@ struct cacheitem {
 extern char *cgit_root;
 extern char *cgit_root_title;
 extern char *cgit_css;
 extern char *cgit_logo;
 extern char *cgit_logo_link;
 extern char *cgit_virtual_root;
 extern char *cgit_cache_root;
 
+extern int cgit_max_lock_attempts;
 extern int cgit_cache_root_ttl;
 extern int cgit_cache_repo_ttl;
 extern int cgit_cache_dynamic_ttl;
 extern int cgit_cache_static_ttl;
 extern int cgit_cache_max_create_time;
 
 extern char *cgit_repo_name;
 extern char *cgit_repo_desc;