mz: Make access to pcap init functions thread safe

mz fails to start in cli mode and prints each time different pcap errors:

	$ mz -x -V
	fatal flex scanner internal error--end of buffer missed
	rx_arp: [ERROR] Error calling pcap_compile

or simply shuts down. Sometimes it successfully gets up.
Seems some initialization pcap functions are not thread safer.

Fixed by using mutex locking before entering pcap_loop()

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/locking.h b/locking.h
index cb57a9d..2cb93d1 100644
--- a/locking.h
+++ b/locking.h
@@ -11,6 +11,8 @@ struct mutexlock {
 	pthread_mutex_t lock;
 };
 
+#define MUTEXLOCK_INITIALIZER { .lock = PTHREAD_MUTEX_INITIALIZER }
+
 struct rwlock {
 	pthread_rwlock_t lock;
 };