Optimize undefended minor check.

[stockfish] / src / misc.cpp

diff --git a/src/misc.cpp b/src/misc.cpp
index 99deedcc6a66f5e8d99086fa2baa2c4ccf59a2a9..8bc413f47be9657217ce0151a0604702f3b100c0 100644 (file)
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -105,6 +105,68 @@ void dbg_print() {
 }
 
 
+/// 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
+
+class Logger {
+
+  Logger() : in(cin.rdbuf(), file), out(cout.rdbuf(), file) {}
+  ~Logger() { start(false); }
+
+  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(), ">> "); }
+
+    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);
+    }
+
+    streambuf* buf;
+    ofstream& file;
+  };
+
+  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();
+    }
+  }
+};
+
+
+/// 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() {
@@ -138,19 +200,11 @@ void timed_wait(WaitCondition& sleepCond, Lock& sleepLock, int msec) {
 #if defined(_WIN32) || defined(_WIN64)
   int tm = msec;
 #else
-  struct timeval t;
-  struct timespec abstime, *tm = &abstime;
-
-  gettimeofday(&t, NULL);
-
-  abstime.tv_sec = t.tv_sec + (msec / 1000);
-  abstime.tv_nsec = (t.tv_usec + (msec % 1000) * 1000) * 1000;
+  timespec ts, *tm = &ts;
+  uint64_t ms = Time::current_time().msec() + msec;
 
-  if (abstime.tv_nsec > 1000000000LL)
-  {
-      abstime.tv_sec += 1;
-      abstime.tv_nsec -= 1000000000LL;
-  }
+  ts.tv_sec = ms / 1000;
+  ts.tv_nsec = (ms % 1000) * 1000000LL;
 #endif
 
   cond_timedwait(sleepCond, sleepLock, tm);