do not exit immediately in case of busy thread

5ms by default, easy to change (change the 10 in the loops)

if the behavior is worse than before, do git revert [commit ID]

openair1/SCHED/phy_procedures_lte_eNb.c

@@ -2577,6 +2577,17 @@ void phy_procedures_eNB_common_RX(PHY_VARS_eNB *eNB,const uint8_t abstraction_fl
     // check if we have to detect PRACH first
     if ((eNB->node_function != NGFI_RRU_IF5) && 
         (is_prach_subframe(fp,proc->frame_rx,proc->subframe_rx)>0)) { // any other node must call prach procedure
+      /* accept some delay in processing - up to 5ms */
+      int i;
+      for (i = 0; i < 10 && proc->instance_cnt_prach == 0; i++) {
+        LOG_W(PHY,"[eNB] Frame %d Subframe %d, eNB PRACH thread busy (IC %d)!!\n", proc->frame_rx,proc->subframe_rx,proc->instance_cnt_prach);
+        usleep(500);
+      }
+      if (proc->instance_cnt_prach == 0) {
+        exit_fun( "PRACH thread busy" );
+        return;
+      }
+
       // wake up thread for PRACH RX
       if (pthread_mutex_lock(&proc->mutex_prach) != 0) {
         LOG_E( PHY, "[eNB] ERROR pthread_mutex_lock for eNB PRACH thread %d (IC %d)\n", proc->instance_cnt_prach );
@@ -2584,25 +2595,19 @@ void phy_procedures_eNB_common_RX(PHY_VARS_eNB *eNB,const uint8_t abstraction_fl
         return;
       }
       
-      int cnt_prach = ++proc->instance_cnt_prach;
+      ++proc->instance_cnt_prach;
       // set timing for prach thread
       proc->frame_prach = proc->frame_rx;
       proc->subframe_prach = proc->subframe_rx;
       
-      pthread_mutex_unlock( &proc->mutex_prach );
-      
-      if (cnt_prach == 0) {
-        // the thread was presumably waiting where it should and can now be woken up
+      // the thread can now be woken up
       if (pthread_cond_signal(&proc->cond_prach) != 0) {
         LOG_E( PHY, "[eNB] ERROR pthread_cond_signal for eNB PRACH thread %d\n", proc->thread_index);
         exit_fun( "ERROR pthread_cond_signal" );
         return;
       }
-      } else {
-        LOG_W( PHY,"[eNB] Frame %d Subframe %d, eNB PRACH thread busy (IC %d)!!\n", proc->frame_rx,proc->subframe_rx,cnt_prach);
-        exit_fun( "PRACH thread busy" );
-        return;
-      }
+
+      pthread_mutex_unlock( &proc->mutex_prach );
     }
     
   } else { // grab transport channel information from network interface

targets/RT/USER/lte-enb.c

@@ -1242,6 +1242,16 @@ static void* eNB_thread_FH( void* param ) {
     // choose even or odd thread for RXn-TXnp4 processing 
     eNB_rxtx_proc_t *proc_rxtx = &proc->proc_rxtx[proc->subframe_rx&1];
 
+    /* accept some delay in processing - up to 5ms */
+    for (i = 0; i < 10 && proc_rxtx->instance_cnt_rxtx == 0; i++) {
+      LOG_W( PHY,"[eNB] Frame %d, eNB RXn-TXnp4 thread busy!! (cnt_rxtx %i)\n", proc_rxtx->frame_tx, proc_rxtx->instance_cnt_rxtx);
+      usleep(500);
+    }
+    if (proc_rxtx->instance_cnt_rxtx == 0) {
+      exit_fun( "TX thread busy" );
+      break;
+    }
+
     // wake up TX for subframe n+4
     // lock the TX mutex and make sure the thread is ready
     if (pthread_mutex_timedlock(&proc_rxtx->mutex_rxtx,&wait) != 0) {
@@ -1249,7 +1259,8 @@ static void* eNB_thread_FH( void* param ) {
       exit_fun( "error locking mutex_rxtx" );
       break;
     }
-    int cnt_rxtx = ++proc_rxtx->instance_cnt_rxtx;
+
+    ++proc_rxtx->instance_cnt_rxtx;
     
     // We have just received and processed the common part of a subframe, say n. 
     // TS_rx is the last received timestamp (start of 1st slot), TS_tx is the desired 
@@ -1263,20 +1274,14 @@ static void* eNB_thread_FH( void* param ) {
     proc_rxtx->frame_tx     = (proc_rxtx->subframe_rx > 5) ? (proc_rxtx->frame_rx+1)&1023 : proc_rxtx->frame_rx;
     proc_rxtx->subframe_tx  = (proc_rxtx->subframe_rx + 4)%10;
    
-    pthread_mutex_unlock( &proc_rxtx->mutex_rxtx );
-   
-    if (cnt_rxtx == 0) {
-      // the thread was presumably waiting where it should and can now be woken up
+    // the thread can now be woken up
     if (pthread_cond_signal(&proc_rxtx->cond_rxtx) != 0) {
       LOG_E( PHY, "[eNB] ERROR pthread_cond_signal for eNB RXn-TXnp4 thread\n");
       exit_fun( "ERROR pthread_cond_signal" );
       break;
     }
-    } else {
-      LOG_W( PHY,"[eNB] Frame %d, eNB RXn-TXnp4 thread busy!! (cnt_rxtx %i)\n", proc_rxtx->frame_tx, cnt_rxtx );
-      exit_fun( "TX thread busy" );
-      break;
-    }          
+
+    pthread_mutex_unlock( &proc_rxtx->mutex_rxtx );
 
     stop_meas( &softmodem_stats_rxtx_sf );
 #ifdef DEADLINE_SCHEDULER