Clear SIGRESUME (SIGUSR1) when exiting xPortStartScheduler

Author: johnboiles

portable/ThirdParty/GCC/Posix/port.c

@@ -202,6 +202,33 @@ void vPortStartFirstTask( void )
 }
 /*-----------------------------------------------------------*/
 
+/*
+ * Clear a signal that is pending for the calling thread.
+ */
+void prvClearPendingSignal( int sig )
+{
+    sigset_t set, oldset;
+
+    /* Block the signal */
+    sigemptyset( &set );
+    sigaddset( &set, sig );
+    pthread_sigmask( SIG_BLOCK, &set, &oldset );
+
+    /* Check if signal is pending */
+    sigpending( &set );
+
+    if( sigismember( &set, sig ) )
+    {
+        int signum;
+        /* Wait for and remove signal */
+        sigwait( &set, &signum );
+    }
+
+    /* Restore the original signal mask */
+    pthread_sigmask( SIG_SETMASK, &oldset, NULL );
+}
+/*-----------------------------------------------------------*/
+
 /*
  * See header file for description.
  */
@@ -250,6 +277,9 @@ BaseType_t xPortStartScheduler( void )
         hSigSetupThread = PTHREAD_ONCE_INIT;
     #endif /* __APPLE__*/
 
+    // Clear SIG_RESUME (SIGUSR1), because it might have fired again while we were shutting things down.
+    prvClearPendingSignal( SIG_RESUME );
+
     /* Restore original signal mask. */
     ( void ) pthread_sigmask( SIG_SETMASK, &xSchedulerOriginalSignalMask, NULL );