[hllock] [dangerous commit] Temporary fix of non-priv side HL

Issue: https://github.com/xaionaro/clsync/issues/140

Non-priv thread/process eat 100% while priv thread is working. This
commit is a temporary fix of the problem.

@@ -215,6 +215,8 @@ expire-after:20M\n\
 // Upper limit
 #define HL_LOCK_AUTO_LIMIT_HIGH		(1<<20)
 
+#define HL_LOCK_NONPRIV_TRIES		HL_LOCK_AUTO_LIMIT_HIGH
+
 //#define READWRITE_SIGNALLING
 
 #define CG_DEV_CONSOLE	"c 5:1"
@@ -241,4 +243,5 @@ expire-after:20M\n\
 #define BSM_QUEUE_LENGTH_MAX		(1024*1024)
 #define GIO_QUEUE_LENGTH_MAX		BSM_QUEUE_LENGTH_MAX
 
+
 #endif

@@ -1227,12 +1227,19 @@ static inline int privileged_action(
 	debug(10, "Waiting the privileged thread/process to get prepared for signal");
 #  ifdef HL_LOCKS
 	if (hl_lock_p->enabled) {
-		while (!hl_isanswered(HLLOCK_HANDLER))
+		long long counter = 0;
+
+		while (!hl_isanswered(HLLOCK_HANDLER)) {
 			if (!helper_isalive_cache) {
 				debug(1, "The privileged thread/process is dead (#0). Ignoring the command.");
 				rc = ENOENT;
 				goto privileged_action_end;
 			}
+			if (++counter > HL_LOCK_NONPRIV_TRIES) {
+				sleep(SLEEP_SECONDS);
+				counter = 0;
+			}
+		}
 	} else {
 #  endif
 		critical_on(!helper_isalive_cache);