[svn] * Proper SVN structureinit

--HG--
branch : trunk

1 files changed, 130 insertions, 0 deletions

diff --git a/dep/src/zthread/win9x/AtomicFastLock.h b/dep/src/zthread/win9x/AtomicFastLock.h
new file mode 100644
index 00000000000..5b50a9c7337
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+++ b/dep/src/zthread/win9x/AtomicFastLock.h
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+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTFASTLOCK_H__
+#define __ZTFASTLOCK_H__
+
+#include "zthread/NonCopyable.h"
+#include <windows.h>
+#include <assert.h>
+
+namespace ZThread {
+
+
+/**
+ * @class FastLock
+ *
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T23:31:51-0400>
+ * @version 2.2.0
+ *
+ * This uses a custom spin lock based on the older swap & compare approach
+ * using the XCHG instruction. You should only use this is you *absolutely* need
+ * to use an older system, like Windows 95. If you can, use the Win32 version.
+ *
+ * Because Windows 95 and earlier can run on processors prior to the 486, they
+ * don't all support the CMPXCHG function, and so Windows 95 an earlier dont support
+ * InterlockedCompareExchange.
+ *
+ * This is asm inlined for microsoft visual c, it needs to be changed in order to
+ * compile with gcc, or another win32 compiler - but more likely than not you'll
+ * be using the Win32 version on those compilers and this won't be a problem.
+ */ 
+class FastLock : private NonCopyable {
+
+// Add def for mingw32 or other non-ms compiler to align on 32-bit boundary
+#pragma pack(push, 4)
+  unsigned char volatile _lock;
+#pragma pack(pop)
+  
+  public:
+  
+  /**
+   * Create a new FastLock
+   */
+  inline FastLock() : _lock(0) { }
+
+  
+  inline ~FastLock() {
+    assert(_lock == 0);
+  }
+
+  inline void acquire() {
+
+    DWORD dw = (DWORD)&_lock;
+
+    _asm { // swap & compare
+    spin_lock:
+
+      mov  al, 1
+      mov  esi, dw
+      xchg [esi], al       
+      and  al,al
+      jz   spin_locked
+    }
+
+    ::Sleep(0);
+
+    _asm {
+      jmp spin_lock
+    spin_locked:
+    }
+
+  }
+
+  inline void release() {
+
+    DWORD dw = (DWORD)&_lock;
+
+    _asm { 
+      mov  al, 0
+      mov  esi, dw
+      xchg [esi], al       
+    }
+
+
+  }
+    
+ inline bool tryAcquire(unsigned long timeout=0) {
+
+    volatile DWORD dw = (DWORD)&_lock;
+    volatile DWORD result;
+
+    _asm {
+
+      mov  al, 1
+      mov  esi, dw
+      xchg [esi], al       
+      and  al,al
+      mov  esi, result
+      xchg [esi], al       
+    }
+
+    return result == 0;
+
+ }
+  
+}; /* Fast Lock */
+
+} // namespace ZThread
+
+#endif