adding executional option for usrp trx thread and adding null device function for device other than usrp

targets/ARCH/BLADERF/USERSPACE/LIB/bladerf_lib.c

@@ -330,7 +330,10 @@ int trx_brf_set_gains(openair0_device* device,
 {
     return(0);
 }
-
+int trx_brf_write_init(openair0_device *device)
+{
+    return 0;
+}
 
 #define RXDCLENGTH 16384
 int16_t cos_fsover8[8]  = {2047,   1447,      0,  -1448,  -2047,  -1448,     0,   1447};
@@ -1145,6 +1148,7 @@ int device_init(openair0_device *device,
     device->trx_stop_func        = trx_brf_stop;
     device->trx_set_freq_func    = trx_brf_set_freq;
     device->trx_set_gains_func   = trx_brf_set_gains;
+    device->trx_write_init       = trx_brf_write_init;
     device->openair0_cfg = openair0_cfg;
     device->priv = (void *)brf;
 

targets/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c

@@ -197,6 +197,10 @@ int trx_eth_reset_stats(openair0_device* device)
     return(0);
 }
 
+int trx_eth_write_init(openair0_device *device)
+{
+    return 0;
+}
 
 int ethernet_tune(openair0_device *device,
                   unsigned int option,
@@ -415,8 +419,9 @@ int transport_init(openair0_device *device,
     device->trx_reset_stats_func = trx_eth_reset_stats;
     device->trx_end_func         = trx_eth_end;
     device->trx_stop_func        = trx_eth_stop;
-    device->trx_set_freq_func = trx_eth_set_freq;
-    device->trx_set_gains_func = trx_eth_set_gains;
+    device->trx_set_freq_func    = trx_eth_set_freq;
+    device->trx_set_gains_func   = trx_eth_set_gains;
+    device->trx_write_init       = trx_eth_write_init;
 
     if (eth->flags == ETH_RAW_MODE) {
         device->trx_write_func   = trx_eth_write_raw;

targets/ARCH/IRIS/USERSPACE/LIB/iris_lib.cpp

@@ -510,6 +510,11 @@ int trx_iris_reset_stats(openair0_device *device) {
 
 }
 
+int trx_iris_write_init(openair0_device *device)
+{
+    return 0;
+}
+
 
 extern "C" {
 /*! \brief Initialize Openair Iris target. It returns 0 if OK
@@ -831,6 +836,7 @@ int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
     device->trx_set_freq_func = trx_iris_set_freq;
     device->trx_set_gains_func = trx_iris_set_gains;
     device->openair0_cfg = openair0_cfg;
+    device->trx_write_init = trx_iris_write_init;
 
     s->sample_rate = openair0_cfg[0].sample_rate;
     // TODO:

targets/ARCH/LMSSDR/USERSPACE/LIB/lms_lib.cpp

@@ -350,6 +350,10 @@ void trx_lms_end(openair0_device *device) {
 
 }
 
+int trx_lms_write_init(openair0_device *device)
+{
+    return 0;
+}
 extern "C" {
 /*! \brief Initialize Openair LMSSDR target. It returns 0 if OK
 * \param device the hardware to use
@@ -406,6 +410,7 @@ int device_init(openair0_device *device, openair0_config_t *openair0_cfg){
   device->trx_stop_func = trx_lms_stop;
   device->trx_set_freq_func = trx_lms_set_freq;
   device->trx_set_gains_func = trx_lms_set_gains;
+  device->trx_write_init = trx_lms_write_init;
 
   device->openair0_cfg = openair0_cfg;
 

targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp

@@ -70,6 +70,8 @@
  * @{
  */
 
+extern int usrp_tx_thread;
+
 
 typedef struct {
 
@@ -345,7 +347,6 @@ static int trx_usrp_write(openair0_device *device,
   int flags_msb = (flags>>8)&0xff;
 
   int end;
-  int write_tread = 0;
   openair0_thread_t *write_thread = &device->write_thread;
   openair0_write_package_t *write_package = write_thread->write_package;
 
@@ -382,7 +383,7 @@ static int trx_usrp_write(openair0_device *device,
      last_packet_state  = true;
     }
 
-  if(write_tread == 0){
+  if(usrp_tx_thread == 0){
 #if defined(__x86_64) || defined(__i386__)
   #ifdef __AVX2__
       nsamps2 = (nsamps+7)>>3;
@@ -586,7 +587,7 @@ void *trx_usrp_write_thread(void * arg){
   return NULL;
 }
 
-int trx_write_init(openair0_device *device){
+int trx_usrp_write_init(openair0_device *device){
 
   uhd::set_thread_priority_safe(1.0);
   openair0_thread_t *write_thread = &device->write_thread;
@@ -932,7 +933,7 @@ extern "C" {
     device->trx_stop_func  = trx_usrp_stop;
     device->trx_set_freq_func = trx_usrp_set_freq;
     device->trx_set_gains_func   = trx_usrp_set_gains;
-    device->trx_write_init = trx_write_init;
+    device->trx_write_init = trx_usrp_write_init;
 
 
     // hotfix! to be checked later

targets/ARCH/tcp_bridge/tcp_bridge.c

@@ -243,6 +243,11 @@ ts += nsamps;
   return nsamps;
 }
 
+int tcp_bridge_write_init(openair0_device *device)
+{
+    return 0;
+}
+
 __attribute__((__visibility__("default")))
 int device_init(openair0_device* device, openair0_config_t *openair0_cfg)
 {
@@ -267,6 +272,7 @@ int device_init(openair0_device* device, openair0_config_t *openair0_cfg)
   device->trx_set_gains_func = tcp_bridge_set_gains;
   device->trx_write_func   = tcp_bridge_write;
   device->trx_read_func    = tcp_bridge_read;
+  device->trx_write_init   = tcp_bridge_write_init;
 
   device->priv = tcp_bridge;