process->exception = nullptr;
// Forcefully kill the actor if its host is turned off. Not an HostFailureException because you should not survive that
- if (process->host_->is_off())
- process->throw_exception(std::make_exception_ptr(simgrid::kernel::context::Context::StopRequest("Host failed")));
+ if (process->host_->is_off()) {
+ /* HORRIBLE HACK: Don't throw an StopRequest exception in Java, because it breaks sometimes.
+ *
+ * It seems to break for the actors started from the Java world, with new Process()
+ * while it works for the ones started from the C world, with the deployment file.
+ * When it happens, the simulation stops brutally with a message "untrapped exception StopRequest".
+ *
+ * From what I understand, it works for the native actors because they have a nice try/catch block around their main
+ * but I fail to have something like that for pure Java actors. That's probably a story of C->Java vs Java->C
+ * calling conventions. The right solution may be to have try/catch(StopRequest) blocks around each native call in
+ * JNI. ie, protect every Java->C++ call from C++ exceptions. But this sounds long and painful to do before we
+ * switch to an automatic generator such as SWIG. For now, we don't throw here that exception that we sometimes fail
+ * to catch.
+ *
+ * One of the unfortunate outcome is that the threads started from the deployment file are not stopped anymore.
+ * Or maybe this is the actors stopping gracefully as opposed to the killed ones? Or maybe this is absolutely all
+ * actors of the Java simulation? I'm not sure. Anyway. Because of them, the simulation hangs at the end, waiting
+ * for them to stop but they won't. The current answer to that is very brutal:
+ * we do a "exit(0)" to kill the JVM from the C code after the call to MSG_run(). Definitely unpleasant.
+ */
+
+ if (simgrid::kernel::context::factory_initializer == nullptr) // Only Java sets a factory_initializer, for now
+ process->throw_exception(std::make_exception_ptr(simgrid::kernel::context::Context::StopRequest("Host failed")));
+ }
/* destroy the blocking synchro if any */
if (process->waiting_synchro != nullptr) {
XBT_DEBUG("Process %s@%s is dead", self->get_cname(), self->host_->get_cname());
self->context_->stop();
+ xbt_backtrace_display_current();
xbt_die("I should be dead by now.");
}
