Initial import of Glaurung 2.1

2025-12-23 10:36:26 +08:00 · 2008-09-01 07:59:13 +02:00
commit bb751d6c89
64 changed files with 18948 additions and 0 deletions
--- a/src/lock.h
+++ b/src/lock.h
@@ -0,0 +1,101 @@
+/*
+  Glaurung, a UCI chess playing engine.
+  Copyright (C) 2004-2008 Tord Romstad
+
+  Glaurung 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.
+  
+  Glaurung 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/>.
+*/
+
+
+#if !defined(LOCK_H_INCLUDED)
+#define LOCK_H_INCLUDED
+
+
+// x86 assembly language locks or OS spin locks may perform faster than
+// mutex locks on some platforms.  On my machine, mutexes seem to be the
+// best.
+
+//#define ASM_LOCK
+//#define OS_SPIN_LOCK
+
+
+#if defined(ASM_LOCK)
+
+
+typedef volatile int Lock;
+
+static inline void LockX86(Lock *lock) {
+  int dummy;
+  asm __volatile__("1:          movl    $1, %0" "\n\t"
+      "            xchgl   (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
+      "            jz      3f" "\n\t" "2:          pause" "\n\t"
+      "            movl    (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
+      "            jnz     2b" "\n\t" "            jmp     1b" "\n\t" "3:"
+      "\n\t":"=&q"(dummy)
+      :"q"(lock)
+      :"cc");
+}
+
+static inline void UnlockX86(Lock *lock) {
+  int dummy;
+  asm __volatile__("movl    $0, (%1)":"=&q"(dummy)
+      :"q"(lock));
+}
+
+#  define lock_init(x, y) (*(x) = 0)
+#  define lock_grab(x) LockX86(x)
+#  define lock_release(x) UnlockX86(x)
+#  define lock_destroy(x)
+
+
+#elif defined(OS_SPIN_LOCK)
+
+
+#  include <libkern/OSAtomic.h>
+
+typedef OSSpinLock Lock;
+
+#  define lock_init(x, y) (*(x) = 0)
+#  define lock_grab(x) OSSpinLockLock(x)
+#  define lock_release(x) OSSpinLockUnlock(x)
+#  define lock_destroy(x)
+
+
+#elif !defined(_MSC_VER)
+
+#  include <pthread.h>
+
+typedef pthread_mutex_t Lock;
+
+#  define lock_init(x, y) pthread_mutex_init(x, y)
+#  define lock_grab(x) pthread_mutex_lock(x)
+#  define lock_release(x) pthread_mutex_unlock(x)
+#  define lock_destroy(x) pthread_mutex_destroy(x)
+
+
+#else
+
+
+#  include <windows.h>
+
+typedef CRITICAL_SECTION Lock;
+#  define lock_init(x, y) InitializeCriticalSection(x)
+#  define lock_grab(x) EnterCriticalSection(x)
+#  define lock_release(x) LeaveCriticalSection(x)
+#  define lock_destroy(x) DeleteCriticalSection(x)
+
+
+#endif
+
+
+#endif // !defined(LOCK_H_INCLUDED)