split common code into a header (part 2/2)

cpp_thread_test/cpp_thread_safety_common.h

@@ -0,0 +1,43 @@
+inline void pauser(){
+    /// a portable way to pause a program
+    std::string dummy;
+    std::cout << "Press enter to continue...";
+    std::getline(std::cin, dummy);
+}
+
+void FillMatrices(std::vector<std::vector<double>>& matBlock, std::mt19937_64& PRNG, std::uniform_real_distribution<double>& rngdist, const blasint randomMatSize, const uint32_t numConcurrentThreads){
+	for(uint32_t i=0; i<3; i++){
+		for(uint32_t j=0; j<(randomMatSize*randomMatSize); j++){
+			matBlock[i][j] = rngdist(PRNG);
+		}
+	}
+	for(uint32_t i=3; i<(numConcurrentThreads*3); i+=3){
+			matBlock[i] = matBlock[0];
+			matBlock[i+1] = matBlock[1];
+			matBlock[i+2] = matBlock[2];
+	}
+}
+
+std::mt19937_64 InitPRNG(){
+	std::random_device rd;
+	std::mt19937_64 PRNG(rd()); //seed PRNG using /dev/urandom or similar OS provided RNG
+	std::uniform_real_distribution<double> rngdist{-1.0, 1.0};
+	//make sure the internal state of the PRNG is properly mixed by generating 10M random numbers
+	//PRNGs often have unreliable distribution uniformity and other statistical properties before their internal state is sufficiently mixed
+	for (uint32_t i=0;i<10000000;i++) rngdist(PRNG);
+	return PRNG;
+}
+
+void PrintMatrices(const std::vector<std::vector<double>>& matBlock, const blasint randomMatSize, const uint32_t numConcurrentThreads){
+	for (uint32_t i=0;i<numConcurrentThreads*3;i++){
+		std::cout<<i<<std::endl;
+		for (uint32_t j=0;j<randomMatSize;j++){
+			for (uint32_t k=0;k<randomMatSize;k++){
+				std::cout<<matBlock[i][j*randomMatSize + k]<<"  ";
+			}
+			std::cout<<std::endl;
+		}
+		std::cout<<std::endl;
+	}
+}
+