[svn] * Proper SVN structureinit

--HG--
branch : trunk

1 files changed, 117 insertions, 0 deletions

diff --git a/dep/src/zthread/linux/AtomicFastLock.h b/dep/src/zthread/linux/AtomicFastLock.h
new file mode 100644
index 00000000000..b9aa1babcd6
--- /dev/null
+++ b/dep/src/zthread/linux/AtomicFastLock.h
@@ -0,0 +1,117 @@
+/*
+ * 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 "../ThreadOps.h"
+#include <assert.h>
+#include <asm/atomic.h>
+
+#if !defined(NDEBUG)
+#  include <pthread.h>
+#endif
+
+namespace ZThread {
+
+/**
+ * @class FastLock
+ *
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T23:27:03-0400>
+ * @version 2.2.0
+ *
+ * This implementation of a FastLock uses the atomic operations that
+ * linux provides with its kernel sources. This demonstrates how to implement
+ * a spinlock with a decrement and test primative.
+ */ 
+class FastLock : private NonCopyable {
+  
+  atomic_t _value;
+  
+#if !defined(NDEBUG)
+  pthread_t _owner;
+#endif
+
+public:
+  
+  inline FastLock() {
+  
+    atomic_t tmp =  ATOMIC_INIT(1);
+    _value = tmp;
+
+  }
+  
+  inline ~FastLock() {
+
+    assert(atomic_read(&_value) == 1);
+    assert(_owner == 0);
+
+  }
+  
+  inline void acquire() {
+
+    while(!atomic_dec_and_test(&_value)) {
+
+      atomic_inc(&_value);
+      ThreadOps::yield();
+
+    }
+        
+#if !defined(NDEBUG)
+    _owner = pthread_self();
+#endif
+  }
+
+  inline void release() {
+    
+#if !defined(NDEBUG)
+    assert(pthread_equal(_owner, pthread_self()) != 0);
+#endif
+
+    atomic_inc(&_value);
+    _owner = 0;
+
+  }
+  
+  inline bool tryAcquire(unsigned long timeout=0) {
+    
+    bool wasLocked = atomic_dec_and_test(&_value);
+    if(!wasLocked)
+      atomic_inc(&_value);
+
+#if !defined(NDEBUG)
+    if(wasLocked)
+      _owner = pthread_self();
+#endif
+
+    return wasLocked;
+    
+  }
+  
+}; /* FastLock */
+
+
+} // namespace ZThread
+
+#endif