fortuna: improve PRNG initialization mutex logic

fortuna.h

@@ -30,10 +30,12 @@ public:
 	auto random_data(unsigned int) -> void;
 
 	auto set_reseed_ctr_to_null() -> void {
+		std::lock_guard<std::mutex> lg(mtx);
 		Fortuna::R.null_da_ctr();
 	}
 
 	auto incr_reseed_ctr() -> void {
+		std::lock_guard<std::mutex> lg(mtx);
 		++Fortuna::R.reseed_ctr;
 	}
 
@@ -44,21 +46,32 @@ public:
 	auto initialize_prng() -> void {
 		// TODO(me): handle the reseeds here as per Cryptography Engineering,
 		// p. 153
-		std::lock_guard<std::mutex> lg(mtx);
 		set_reseed_ctr_to_null();
+		std::unique_lock<std::mutex> p_ul(print_mtx);
 		try {
+			std::unique_lock<std::mutex> ul(mtx);
 			R.initialize_pools();
+			ul.unlock();
 			fmt::print("pools initialized\n");
+			p_ul.unlock();
+			ul.lock();
 			accumulator.set_gen(R.Gen);
+			ul.unlock();
 			// FIXME: bogus first reseed here, P_0 definitely hasn't collected
 			// enough entropy by now
 			incr_reseed_ctr();
+			p_ul.lock();
 			fmt::print("first reseed\n");
+			p_ul.unlock();
+			ul.lock();
 			R.Gen.reseed("fortuna");
+			ul.unlock();
 		}
 		catch (std::exception& e) {
+			p_ul.try_lock();
 			fmt::print("{}\n", e.what());
 		}
+		p_ul.try_lock();
 		fmt::print("PRNG initialized\n");
 	}