hello linux delay thread

V203/hello/linux/alsasound.cpp

@@ -55,6 +55,7 @@ static constexpr int CC = MAXPWM / 2;
 static pthread_t rc;
 
 void * WriteHandler (void * data) {
+  usleep(10'000);
   printf ("Start thread\n");
   PwmClass * pA = (PwmClass *) data;
   Sample buf [BufLen];

V203/hello/linux/print.cpp

@@ -1,10 +1,12 @@
 #include <cstdio>
+#include <mutex>
 #include "utils.h"
+
 void print_morse_table (const TABLE<unsigned char, 64> & tab) {
   int n = 0;
   printf("static const unsigned char compressed_table [] = {");
   for (auto & e: tab) {
-    if ((n % 16) == 0) printf("\n");
+    if ((n % 16) == 0) printf("\n  ");
     printf("0x%02x,", e);
     n++;
   }