Synchronise windows logging in ethminer.

libethash-cl/ethash_cl_miner.cpp

@@ -32,6 +32,8 @@
 #include <vector>
 #include <random>
 #include <random>
+#include <atomic>
+#include <sstream>
 #include <libethash/util.h>
 #include <libethash/ethash.h>
 #include <libethash/internal.h>
@@ -56,7 +58,22 @@ unsigned const ethash_cl_miner::c_defaultGlobalWorkSizeMultiplier = 4096; // * C
 unsigned const ethash_cl_miner::c_defaultMSPerBatch = 0;
 
 // TODO: If at any point we can use libdevcore in here then we should switch to using a LogChannel
+#if defined(_WIN32)
+extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char* lpOutputString);
+static std::atomic_flag s_logSpin = ATOMIC_FLAG_INIT;
+#define ETHCL_LOG(_contents) \
+	do \
+	{ \
+		std::stringstream ss; \
+		ss << _contents; \
+		while (s_logSpin.test_and_set(std::memory_order_acquire)) {} \
+		OutputDebugStringA(ss.str().c_str()); \
+		cerr << ss.str() << endl << flush; \
+		s_logSpin.clear(std::memory_order_release); \
+	} while (false)
+#else
 #define ETHCL_LOG(_contents) cout << "[OPENCL]:" << _contents << endl
+#endif
 // Types of OpenCL devices we are interested in
 #define ETHCL_QUERIED_DEVICE_TYPES (CL_DEVICE_TYPE_GPU | CL_DEVICE_TYPE_ACCELERATOR)