examples/: Adapt to new exception propagation

rt/examples/fork_exceptions.cpp

@@ -18,51 +18,46 @@ Task<void> hello(int id) {
   co_return;
 }
 
-Task<void> fail() {
+Task<void> fail(int delay) {
+  volatile int n = fibo(delay);
+  (void) n;
   throw std::exception();
   co_return;
 }
 
-Join<void> fail_join() {
-  co_await fork(fail());
+Join<void> fail_join(int delay = 0) {
+  co_await fork(fail(delay));
 }
 
 Join<void> join_sync(int max) {
   for (int id = 0; id < max; id++) {
     co_await fork(hello(id));
   }
-  try {
   co_await fork(fail_join());
   LOG("    ... fork(fail_join()) did not throw (stolen continuation)");
-  } catch(std::exception &) {
-    LOG("    ... fork(fail_join()) did throw, rethrowing");
-    throw;
-  }
   LOG("    ... sync()");
-  try
-  {
   co_await Sync();
   LOG("    ... ERROR sync() did not throw");
-  } catch(std::exception &) {
-    LOG("    ... OK sync() did throw, rethrowing");
-    throw;
-  }
 }
 
 Join<void> join_no_sync(int max) {
   for (int id = 0; id < max; id++) {
     co_await fork(hello(id));
   }
-  try {
   co_await fork(fail_join());
   LOG("    ... fork(fail_join()) did not throw (stolen continuation)");
-  } catch(std::exception &) {
-    LOG("    ... fork(fail_join()) did throw, rethrowing");
-    throw;
-  }
   LOG("    ... join_no_sync(%d) is exiting normally", max);
 }
 
+Join<void> join_infinite_fork_loop() {
+  co_await fork(fail_join(25));
+  LOG("    ... fork(fail_join()) did not throw (stolen continuation)");
+  LOG("    ... now looping forever");
+  for (int id = 0; ; id++) {
+    co_await fork(hello(id));
+  }
+}
+
 Root root_sync(int max) {
   try {
     LOG(">>> join_sync(%d)", max);
@@ -83,11 +78,21 @@ Root root_no_sync(int max) {
   }
 }
 
+Root root_infinite_fork_loop() {
+  try {
+    LOG(">>> join_infinite_fork_loop()");
+    co_await join_infinite_fork_loop();
+  } catch(std::exception &) {
+    LOG("OK join_infinite_fork_loop() did throw eventually\n");
+  }
+}
+
 int main() {
   root_sync(0).call();
   root_sync(20).call();
   root_no_sync(0).call();
   root_no_sync(20).call();
+  root_infinite_fork_loop().call();
   puts("done");
   return 0;
 }