2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
28 # include <sys/pstat.h>
33 /// Version number. If Version is left empty, then Tag plus current
34 /// date, in the format DD-MM-YY, are used as a version number.
36 static const string Version = "";
37 static const string Tag = "";
40 /// engine_info() returns the full name of the current Stockfish version. This
41 /// will be either "Stockfish <Tag> DD-MM-YY" (where DD-MM-YY is the date when
42 /// the program was compiled) or "Stockfish <Version>", depending on whether
45 const string engine_info(bool to_uci) {
47 const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
48 string month, day, year;
49 stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
51 s << "Stockfish " << Version;
55 date >> month >> day >> year;
57 s << Tag << string(Tag.empty() ? "" : " ") << setfill('0') << setw(2) << day
58 << setw(2) << (1 + months.find(month) / 4) << year.substr(2);
61 s << (Is64Bit ? " 64" : "")
62 << (HasPopCnt ? " SSE4.2" : "")
63 << (to_uci ? "\nid author ": " by ")
64 << "Tord Romstad, Marco Costalba and Joona Kiiski";
70 /// Convert system time to milliseconds. That's all we need.
72 Time::point Time::now() {
73 sys_time_t t; system_time(&t); return time_to_msec(t);
77 /// Debug functions used mainly to collect run-time statistics
79 static uint64_t hits[2], means[2];
81 void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
82 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
83 void dbg_mean_of(int v) { means[0]++; means[1] += v; }
88 cerr << "Total " << hits[0] << " Hits " << hits[1]
89 << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
92 cerr << "Total " << means[0] << " Mean "
93 << (float)means[1] / means[0] << endl;
97 /// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
98 /// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
99 /// can toggle the logging of std::cout and std:cin at runtime while preserving
100 /// usual i/o functionality and without changing a single line of code!
101 /// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
103 struct Tie: public streambuf { // MSVC requires splitted streambuf for cin and cout
105 Tie(streambuf* b, ofstream* f) : buf(b), file(f) {}
107 int sync() { return file->rdbuf()->pubsync(), buf->pubsync(); }
108 int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
109 int underflow() { return buf->sgetc(); }
110 int uflow() { return log(buf->sbumpc(), ">> "); }
115 int log(int c, const char* prefix) {
117 static int last = '\n';
120 file->rdbuf()->sputn(prefix, 3);
122 return last = file->rdbuf()->sputc((char)c);
128 Logger() : in(cin.rdbuf(), &file), out(cout.rdbuf(), &file) {}
129 ~Logger() { start(false); }
135 static void start(bool b) {
139 if (b && !l.file.is_open())
141 l.file.open("io_log.txt", ifstream::out | ifstream::app);
145 else if (!b && l.file.is_open())
147 cout.rdbuf(l.out.buf);
155 /// Used to serialize access to std::cout to avoid multiple threads to write at
158 std::ostream& operator<<(std::ostream& os, SyncCout sc) {
172 /// Trampoline helper to avoid moving Logger to misc.h
173 void start_logger(bool b) { Logger::start(b); }
176 /// cpu_count() tries to detect the number of CPU cores
183 return s.dwNumberOfProcessors;
186 # if defined(_SC_NPROCESSORS_ONLN)
187 return sysconf(_SC_NPROCESSORS_ONLN);
188 # elif defined(__hpux)
189 struct pst_dynamic psd;
190 if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
192 return psd.psd_proc_cnt;
201 /// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
202 /// conversion from milliseconds to struct timespec, as used by pthreads.
204 void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
209 timespec ts, *tm = &ts;
210 uint64_t ms = Time::now() + msec;
212 ts.tv_sec = ms / 1000;
213 ts.tv_nsec = (ms % 1000) * 1000000LL;
216 cond_timedwait(sleepCond, sleepLock, tm);
220 /// prefetch() preloads the given address in L1/L2 cache. This is a non
221 /// blocking function and do not stalls the CPU waiting for data to be
222 /// loaded from memory, that can be quite slow.
223 #if defined(NO_PREFETCH)
225 void prefetch(char*) {}
229 void prefetch(char* addr) {
231 # if defined(__INTEL_COMPILER)
232 // This hack prevents prefetches to be optimized away by
233 // Intel compiler. Both MSVC and gcc seems not affected.
237 # if defined(__INTEL_COMPILER) || defined(_MSC_VER)
238 _mm_prefetch(addr, _MM_HINT_T0);
240 __builtin_prefetch(addr);