Handout

kernel/utils/random.h

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+
+/*! \file
+ *  \brief Class \ref Random (PRNG based on Mersenne Twister)
+ */
+
+#pragma once
+
+#include "types.h"
+
+/*! Mersenne Twister (32 bit pseudorandom number generator)
+ *
+ * \see [Wikipedia](https://en.wikipedia.org/wiki/Mersenne_Twister)
+ */
+class Random {
+   private:
+	static const uint32_t N = 624;
+	static const uint32_t M = 397;
+	static const uint32_t R = 31;
+	static const uint32_t A = 0x9908B0DF;
+
+	// initialization multiplier
+	static const uint32_t F = 1812433253;
+
+	static const uint32_t U = 11;
+
+	static const uint32_t S = 7;
+	static const uint32_t B = 0x9D2C5680;
+
+	static const uint32_t T = 15;
+	static const uint32_t C = 0xEFC60000;
+
+	static const uint32_t L = 18;
+
+	static const uint32_t MASK_LOWER = (1UL << R) - 1;
+	static const uint32_t MASK_UPPER = (1UL << R);
+
+	uint32_t mt[N];
+	uint16_t index;
+
+   public:
+	/*! \brief Constructor
+	 *
+	 *  \param seed initial value (seed) for the pseudorandom number generator.
+	 */
+	explicit Random(uint32_t seed);
+
+	/*! \brief Get the next (pseudo)random number.
+	 *  \return some number
+	 */
+	uint32_t number();
+};