Add tool to test PBD::signal d'tor race-condition

tools/signal-test/makefile

@@ -0,0 +1,18 @@
+AD = ../..
+CXXFLAGS = -Wall -pthread -g
+CPPFLAGS = -I $(AD)/libs/pbd -I $(AD)/build/libs/pbd
+CPPFLAGS += `pkg-config --cflags glibmm-2.4`
+
+LDFLAGS = -L$(AD)/build/libs/pbd -Wl,-rpath=$(AD)/build/libs/pbd
+LDLIBS  = `pkg-config --libs glibmm-2.4` -lpbd
+
+signal-test: signal-test.cc
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) -o $@ signal-test.cc $(LDLIBS)
+
+clean:
+	rm -f signal-test
+
+test: signal-test
+	while test $$? = 0 ; do echo -n "."; ./signal-test; done
+
+.PHONY: clean test

tools/signal-test/signal-test.cc

@@ -0,0 +1,65 @@
+#include <cstdint>
+#include <cstdlib>
+#include <pthread.h>
+
+#include "pbd/pbd.h"
+#include "pbd/signals.h"
+
+class Tx {
+public:
+	PBD::Signal1<void, int> sig1;
+};
+
+class Rx {
+public:
+	Rx (Tx& sender) {
+		sender.sig1.connect_same_thread (_connection, boost::bind (&Rx::cb, this, _1));
+	}
+
+private:
+	void cb (int i) {
+		printf ("CB %d\n", i);
+	}
+
+	PBD::ScopedConnection _connection;
+};
+
+pthread_barrier_t barrier;
+
+static void* delete_t (void* arg) {
+	Tx* t = static_cast<Tx*> (arg);
+	pthread_barrier_wait (&barrier);
+	delete t;
+	//printf ("Deleted tx\n");
+	return 0;
+}
+
+static void* delete_r (void* arg) {
+	Rx* r = static_cast<Rx*> (arg);
+	pthread_barrier_wait (&barrier);
+	delete r;
+	//printf ("Deleted rx\n");
+	return 0;
+}
+
+int
+main (int argc, char** argv)
+{
+	PBD::init ();
+	Tx* t = new Tx ();
+	Rx* r = new Rx (*t);
+
+	//t->sig1 (11); /* EMIT SIGNAL */
+
+	pthread_barrier_init (&barrier, NULL, 2);
+	pthread_t dt, dr;
+	pthread_create (&dt, NULL, delete_t, (void*)t);
+	pthread_create (&dr, NULL, delete_r, (void*)r);
+
+	pthread_join (dt, NULL);
+	pthread_join (dr, NULL);
+
+	pthread_barrier_destroy (&barrier);
+	PBD::cleanup ();
+	return 0;
+}