X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmisc.h;h=a2307fe779ad7fda3463031fe6bdbbb3223735f3;hp=24d41d1a0e7a5e2ada7d6c5da492e10ff68d86b9;hb=b96dd754ede60b8463606cf38eac3eab400a123d;hpb=92e759a676b5f2886160fc8f43744f137a0a19b1

diff --git a/src/misc.h b/src/misc.h
index 24d41d1a..a2307fe7 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -1,7 +1,8 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,59 +18,83 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#if !defined(MISC_H_INCLUDED)
+#ifndef MISC_H_INCLUDED
 #define MISC_H_INCLUDED
 
-#include <fstream>
+#include <cassert>
+#include <chrono>
+#include <ostream>
 #include <string>
 #include <vector>
 
 #include "types.h"
 
-extern const std::string engine_info(bool to_uci = false);
-extern int cpu_count();
-extern void timed_wait(WaitCondition&, Lock&, int);
-extern void prefetch(char* addr);
-extern void start_logger(bool b);
+const std::string engine_info(bool to_uci = false);
+void prefetch(void* addr);
+void start_logger(const std::string& fname);
 
-extern void dbg_hit_on(bool b);
-extern void dbg_hit_on_c(bool c, bool b);
-extern void dbg_mean_of(int v);
-extern void dbg_print();
+void dbg_hit_on(bool b);
+void dbg_hit_on(bool c, bool b);
+void dbg_mean_of(int v);
+void dbg_print();
 
+typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds
 
-struct Log : public std::ofstream {
-  Log(const std::string& f = "log.txt") : std::ofstream(f.c_str(), std::ios::out | std::ios::app) {}
- ~Log() { if (is_open()) close(); }
+inline TimePoint now() {
+  return std::chrono::duration_cast<std::chrono::milliseconds>
+        (std::chrono::steady_clock::now().time_since_epoch()).count();
+}
+
+template<class Entry, int Size>
+struct HashTable {
+  Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
+
+private:
+  std::vector<Entry> table = std::vector<Entry>(Size);
 };
 
 
-struct Time {
-  void restart() { system_time(&t); }
-  int64_t msec() const { return time_to_msec(t); }
-  int elapsed() const { return int(current_time().msec() - time_to_msec(t)); }
+enum SyncCout { IO_LOCK, IO_UNLOCK };
+std::ostream& operator<<(std::ostream&, SyncCout);
 
-  static Time current_time() { Time t; t.restart(); return t; }
+#define sync_cout std::cout << IO_LOCK
+#define sync_endl std::endl << IO_UNLOCK
 
-private:
-  sys_time_t t;
-};
 
+/// xorshift64star Pseudo-Random Number Generator
+/// This class is based on original code written and dedicated
+/// to the public domain by Sebastiano Vigna (2014).
+/// It has the following characteristics:
+///
+///  -  Outputs 64-bit numbers
+///  -  Passes Dieharder and SmallCrush test batteries
+///  -  Does not require warm-up, no zeroland to escape
+///  -  Internal state is a single 64-bit integer
+///  -  Period is 2^64 - 1
+///  -  Speed: 1.60 ns/call (Core i7 @3.40GHz)
+///
+/// For further analysis see
+///   <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
 
-template<class Entry, int Size>
-struct HashTable {
-  HashTable() : e(Size, Entry()) { memset(&e[0], 0, sizeof(Entry) * Size); }
-  Entry* operator[](Key k) { return &e[(uint32_t)k & (Size - 1)]; }
+class PRNG {
 
-private:
-  std::vector<Entry> e;
-};
+  uint64_t s;
 
+  uint64_t rand64() {
 
-enum SyncCout { io_lock, io_unlock };
-std::ostream& operator<<(std::ostream&, SyncCout);
+    s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
+    return s * 2685821657736338717LL;
+  }
+
+public:
+  PRNG(uint64_t seed) : s(seed) { assert(seed); }
 
-#define sync_cout std::cout << io_lock
-#define sync_endl std::endl << io_unlock
+  template<typename T> T rand() { return T(rand64()); }
+
+  /// Special generator used to fast init magic numbers.
+  /// Output values only have 1/8th of their bits set on average.
+  template<typename T> T sparse_rand()
+  { return T(rand64() & rand64() & rand64()); }
+};
 
-#endif // !defined(MISC_H_INCLUDED)
+#endif // #ifndef MISC_H_INCLUDED