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-rw-r--r--device-functions.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/device-functions.c b/device-functions.c
index 8e59686..726b782 100644
--- a/device-functions.c
+++ b/device-functions.c
@@ -4462,6 +4462,9 @@ void Set_Sav(int setting_num)
void Main_update_shift_registers()
{
+ static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
+ g_static_mutex_lock (&mutex);
+
/* send MSB first, LSB last */
/* send highest # SR first */
@@ -4549,6 +4552,8 @@ void Main_update_shift_registers()
globals.Changes.update_amp = 0;
globals.Changes.update_zout = 0;
globals.Changes.update_load = 0;
+
+ g_static_mutex_unlock (&mutex);
}