Actually load the DAG.

alethzero/MainWin.cpp

@@ -1166,7 +1166,7 @@ void Main::on_turboMining_triggered()
 
 void Main::refreshBlockChain()
 {
-	if (!ui->blocks->isVisible())
+	if (!ui->blocks->isVisible() || !isVisible())
 		return;
 
 	DEV_TIMED_FUNCTION;

ethminer/MinerAux.h

@@ -419,7 +419,7 @@ private:
 					Json::Value v = rpc.eth_getWork();
 					h256 hh(v[0].asString());
 					h256 newSeedHash(v[1].asString());
-                    if (!(dag = EthashAux::full(newSeedHash, true)))
+					if (!(dag = EthashAux::full(newSeedHash, true, [&](unsigned _pc){ cout << "\rCreating DAG. " << _pc << "% done..." << flush; return 0; })))
 						BOOST_THROW_EXCEPTION(DAGCreationFailure());
 					if (hh != current.headerHash)
 					{

libethcore/EthashAux.cpp

@@ -167,7 +167,7 @@ EthashAux::FullType EthashAux::full(h256 const& _seedHash, bool _createIfMissing
 			return ret;
 		}
 
-	if (_createIfMissing || computeFull(_seedHash) == 100)
+	if (_createIfMissing || computeFull(_seedHash, false) == 100)
 	{
 		s_dagCallback = _f;
 		cnote << "Loading from libethash...";
@@ -183,7 +183,7 @@ EthashAux::FullType EthashAux::full(h256 const& _seedHash, bool _createIfMissing
 
 #define DEV_IF_THROWS(X) try { X; } catch (...)
 
-unsigned EthashAux::computeFull(h256 const& _seedHash)
+unsigned EthashAux::computeFull(h256 const& _seedHash, bool _createIfMissing)
 {
 	Guard l(get()->x_fulls);
 	uint64_t blockNumber;
@@ -199,7 +199,7 @@ unsigned EthashAux::computeFull(h256 const& _seedHash)
 		return 100;
 	}
 
-	if (!get()->m_fullGenerator || !get()->m_fullGenerator->joinable())
+	if (_createIfMissing && (!get()->m_fullGenerator || !get()->m_fullGenerator->joinable()))
 	{
 		get()->m_fullProgress = 0;
 		get()->m_generatingFullNumber = blockNumber / ETHASH_EPOCH_LENGTH * ETHASH_EPOCH_LENGTH;

libethcore/EthashAux.h

@@ -71,7 +71,7 @@ public:
 
 	static const uint64_t NotGenerating = (uint64_t)-1;
 	/// Kicks off generation of DAG for @a _seedHash and @returns false or @returns true if ready.
-	static unsigned computeFull(h256 const& _seedHash);
+	static unsigned computeFull(h256 const& _seedHash, bool _createIfMissing = true);
 	/// Information on the generation progress.
 	static std::pair<uint64_t, unsigned> fullGeneratingProgress() { return std::make_pair(get()->m_generatingFullNumber, get()->m_fullProgress); }
 	/// Kicks off generation of DAG for @a _blocknumber and blocks until ready; @returns result or empty pointer if not existing and _createIfMissing is false.