pthread is now a core dependency instead of just a toxav dependency.

Fixed possible thread bug with sending A/V packets.

TODO: eventually make toxcore thread safe.

configure.ac

@@ -459,15 +459,13 @@ if (test "x$WIN32" != "xyes") && (test "x$MACH" != "xyes") && (test "x$DISABLE_R
     )
 fi
 
-if test "x$BUILD_AV" = "xyes"; then
-    AX_PTHREAD(
-        [],
-        [
-            AC_MSG_WARN([disabling AV support: required pthread library not found])
-            BUILD_AV="no"
-        ]
-    )
-fi
+
+AX_PTHREAD(
+    [],
+    [
+        AC_MSG_ERROR([required library pthread was not found on your system])
+    ]
+)
 
 if test "x$BUILD_AV" = "xyes"; then
     PKG_CHECK_MODULES([OPUS], [opus],

toxcore/Makefile.inc

@@ -50,7 +50,8 @@ libtoxcore_la_SOURCES = ../toxcore/DHT.h \
 libtoxcore_la_CFLAGS =  -I$(top_srcdir) \
                         -I$(top_srcdir)/toxcore \
                         $(LIBSODIUM_CFLAGS) \
-                        $(NACL_CFLAGS)
+                        $(NACL_CFLAGS) \
+                        $(PTHREAD_CFLAGS)
 
 libtoxcore_la_LDFLAGS = $(TOXCORE_LT_LDFLAGS) \
                         $(EXTRA_LT_LDFLAGS) \
@@ -62,4 +63,5 @@ libtoxcore_la_LDFLAGS = $(TOXCORE_LT_LDFLAGS) \
 
 libtoxcore_la_LIBADD =  $(LIBSODIUM_LIBS) \
                         $(NACL_OBJECTS) \
-                        $(NAC_LIBS)
+                        $(NAC_LIBS) \
+                        $(PTHREAD_LIBS)

toxcore/Messenger.c

@@ -2184,6 +2184,7 @@ static int handle_packet(void *object, int i, uint8_t *temp, uint16_t len)
             for (i = 0; i < n; i++) {
                 add_tcp_relay(m->net_crypto, nodes[i].ip_port, nodes[i].client_id);
             }
+
             break;
         }
 

toxcore/net_crypto.c

@@ -728,16 +728,21 @@ static int send_data_packet(Net_Crypto *c, int crypt_connection_id, uint8_t *dat
     if (conn == 0)
         return -1;
 
+    pthread_mutex_lock(&conn->mutex);
     uint8_t packet[1 + sizeof(uint16_t) + length + crypto_box_MACBYTES];
     packet[0] = NET_PACKET_CRYPTO_DATA;
     memcpy(packet + 1, conn->sent_nonce + (crypto_box_NONCEBYTES - sizeof(uint16_t)), sizeof(uint16_t));
     int len = encrypt_data_symmetric(conn->shared_key, conn->sent_nonce, data, length, packet + 1 + sizeof(uint16_t));
 
-    if (len + 1 + sizeof(uint16_t) != sizeof(packet))
+    if (len + 1 + sizeof(uint16_t) != sizeof(packet)) {
+        pthread_mutex_unlock(&conn->mutex);
         return -1;
+    }
 
     increment_nonce(conn->sent_nonce);
-    return send_packet_to(c, crypt_connection_id, packet, sizeof(packet));
+    int ret = send_packet_to(c, crypt_connection_id, packet, sizeof(packet));
+    pthread_mutex_unlock(&conn->mutex);
+    return ret;
 }
 
 /* Creates and sends a data packet with buffer_start and num to the peer using the fastest route.
@@ -1246,6 +1251,7 @@ static int create_crypto_connection(Net_Crypto *c)
 
     memset(&(c->crypto_connections[c->crypto_connections_length]), 0, sizeof(Crypto_Connection));
     int id = c->crypto_connections_length;
+    pthread_mutex_init(&c->crypto_connections[id].mutex, NULL);
     ++c->crypto_connections_length;
     return id;
 }
@@ -1261,6 +1267,7 @@ static int wipe_crypto_connection(Net_Crypto *c, int crypt_connection_id)
         return -1;
 
     uint32_t i;
+    pthread_mutex_destroy(&c->crypto_connections[crypt_connection_id].mutex);
     memset(&(c->crypto_connections[crypt_connection_id]), 0 , sizeof(Crypto_Connection));
 
     for (i = c->crypto_connections_length; i != 0; --i) {

toxcore/net_crypto.h

@@ -26,6 +26,7 @@
 
 #include "DHT.h"
 #include "TCP_client.h"
+#include <pthread.h>
 
 #define CRYPTO_CONN_NO_CONNECTION 0
 #define CRYPTO_CONN_COOKIE_REQUESTING 1 //send cookie request packets
@@ -155,6 +156,8 @@ typedef struct {
 
     Node_format tcp_relays[MAX_TCP_RELAYS_PEER];
     uint16_t num_tcp_relays;
+
+    pthread_mutex_t mutex;
 } Crypto_Connection;
 
 typedef struct {