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misc.cpp
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misc.cpp
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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iomanip>
#include <iostream>
#include <sstream>
#include "misc.h"
#include "thread.h"
#if defined(__hpux)
# include <sys/pstat.h>
#endif
using namespace std;
/// Version number. If Version is left empty, then Tag plus current
/// date, in the format DD-MM-YY, are used as a version number.
static const string Version = "";
static const string Tag = "";
/// engine_info() returns the full name of the current Stockfish version. This
/// will be either "Stockfish <Tag> DD-MM-YY" (where DD-MM-YY is the date when
/// the program was compiled) or "Stockfish <Version>", depending on whether
/// Version is empty.
const string engine_info(bool to_uci) {
const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
const string cpu64(Is64Bit ? " 64bit" : "");
const string popcnt(HasPopCnt ? " SSE4.2" : "");
string month, day, year;
stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
s << "Stockfish " << Version;
if (Version.empty())
{
date >> month >> day >> year;
s << Tag << string(Tag.empty() ? "" : " ") << setfill('0') << setw(2) << day
<< "-" << setw(2) << (1 + months.find(month) / 4) << "-" << year.substr(2);
}
s << cpu64 << popcnt << (to_uci ? "\nid author ": " by ")
<< "Tord Romstad, Marco Costalba and Joona Kiiski";
return s.str();
}
/// Convert system time to milliseconds. That's all we need.
Time::point Time::now() {
sys_time_t t; system_time(&t); return time_to_msec(t);
}
/// Debug functions used mainly to collect run-time statistics
static uint64_t hits[2], means[2];
void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
void dbg_mean_of(int v) { means[0]++; means[1] += v; }
void dbg_print() {
if (hits[0])
cerr << "Total " << hits[0] << " Hits " << hits[1]
<< " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
if (means[0])
cerr << "Total " << means[0] << " Mean "
<< (float)means[1] / means[0] << endl;
}
/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
/// can toggle the logging of std::cout and std:cin at runtime while preserving
/// usual i/o functionality and without changing a single line of code!
/// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
struct Tie: public streambuf { // MSVC requires splitted streambuf for cin and cout
Tie(streambuf* b, ofstream* f) : buf(b), file(f) {}
int sync() { return file->rdbuf()->pubsync(), buf->pubsync(); }
int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
int underflow() { return buf->sgetc(); }
int uflow() { return log(buf->sbumpc(), ">> "); }
streambuf* buf;
ofstream* file;
int log(int c, const char* prefix) {
static int last = '\n';
if (last == '\n')
file->rdbuf()->sputn(prefix, 3);
return last = file->rdbuf()->sputc((char)c);
}
};
class Logger {
Logger() : in(cin.rdbuf(), &file), out(cout.rdbuf(), &file) {}
~Logger() { start(false); }
ofstream file;
Tie in, out;
public:
static void start(bool b) {
static Logger l;
if (b && !l.file.is_open())
{
l.file.open("io_log.txt", ifstream::out | ifstream::app);
cin.rdbuf(&l.in);
cout.rdbuf(&l.out);
}
else if (!b && l.file.is_open())
{
cout.rdbuf(l.out.buf);
cin.rdbuf(l.in.buf);
l.file.close();
}
}
};
/// Used to serialize access to std::cout to avoid multiple threads to write at
/// the same time.
std::ostream& operator<<(std::ostream& os, SyncCout sc) {
static Mutex m;
if (sc == io_lock)
m.lock();
if (sc == io_unlock)
m.unlock();
return os;
}
/// Trampoline helper to avoid moving Logger to misc.h
void start_logger(bool b) { Logger::start(b); }
/// cpu_count() tries to detect the number of CPU cores
int cpu_count() {
#if defined(_WIN32)
SYSTEM_INFO s;
GetSystemInfo(&s);
return s.dwNumberOfProcessors;
#else
# if defined(_SC_NPROCESSORS_ONLN)
return sysconf(_SC_NPROCESSORS_ONLN);
# elif defined(__hpux)
struct pst_dynamic psd;
if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
return 1;
return psd.psd_proc_cnt;
# else
return 1;
# endif
#endif
}
/// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
/// conversion from milliseconds to struct timespec, as used by pthreads.
void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
#if defined(_WIN32)
int tm = msec;
#else
timespec ts, *tm = &ts;
uint64_t ms = Time::now() + msec;
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000LL;
#endif
cond_timedwait(sleepCond, sleepLock, tm);
}
/// prefetch() preloads the given address in L1/L2 cache. This is a non
/// blocking function and do not stalls the CPU waiting for data to be
/// loaded from memory, that can be quite slow.
#if defined(NO_PREFETCH)
void prefetch(char*) {}
#else
void prefetch(char* addr) {
# if defined(__INTEL_COMPILER)
// This hack prevents prefetches to be optimized away by
// Intel compiler. Both MSVC and gcc seems not affected.
__asm__ ("");
# endif
# if defined(__INTEL_COMPILER) || defined(_MSC_VER)
_mm_prefetch(addr, _MM_HINT_T0);
# else
__builtin_prefetch(addr);
# endif
}
#endif