1 files changed, 11 insertions, 1 deletions

diff --git a/src/usbmux.c b/src/usbmux.c
index 20c1298..c5e38dd 100644
--- a/src/usbmux.c
+++ b/src/usbmux.c
@@ -106,6 +106,7 @@ struct usbmux_client_int {
 
 
 static pthread_mutex_t usbmuxmutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t printmutex = PTHREAD_MUTEX_INITIALIZER;
 static usbmux_client_t *connlist = NULL;
 static int clients = 0;
 
@@ -126,8 +127,11 @@ static void log_debug_msg(const char *format, ...)
         /* run the real fprintf */
         va_start(args, format);
 
-        if (toto_debug)
+        if (toto_debug) {
+                pthread_mutex_lock(&printmutex);
                 vfprintf(stderr, format, args);
+                pthread_mutex_unlock(&printmutex);
+        }
 
         va_end(args);
 #endif
@@ -433,10 +437,12 @@ static int send_to_device(usbmux_device_t device, char *data, int datalen)
         int bytes = 0;
 
 if (toto_debug > 0) {
+        pthread_mutex_lock(&printmutex);
         printf("===============================\n%s: trying to send\n",
                    __func__);
         print_buffer(data, datalen);
         printf("===============================\n");
+        pthread_mutex_unlock(&printmutex);
 }
 
         do {
@@ -486,10 +492,12 @@ if (toto_debug > 0) {
 
         if (bytes > 0) {
                 if (toto_debug > 0) {
+                        pthread_mutex_lock(&printmutex);
                         printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
                         printf("%s: sent to device\n", __func__);
                         print_buffer(data, bytes);
                         printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+                        pthread_mutex_unlock(&printmutex);
                 }
         }
         return bytes;
@@ -534,10 +542,12 @@ static int recv_from_device_timeout(usbmux_device_t device, char *data,
         }
         if (bytes > 0) {
                 if (toto_debug > 0) {
+                        pthread_mutex_lock(&printmutex);
                         printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
                         printf("%s: received from device:\n", __func__);
                         print_buffer(data, bytes);
                         printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
+                        pthread_mutex_unlock(&printmutex);
                 }
         }