1 files changed, 197 insertions, 0 deletions
diff --git a/dep/src/zthread/win32/ThreadOps.cxx b/dep/src/zthread/win32/ThreadOps.cxx
new file mode 100644
index 00000000000..6e8fb8d3b71
--- /dev/null
+++ b/dep/src/zthread/win32/ThreadOps.cxx
@@ -0,0 +1,197 @@
+/*
+ * 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.
+ *
+ */
+
+#include "ThreadOps.h"
+#include "zthread/Runnable.h"
+#include <process.h>
+
+namespace ZThread {
+
+const ThreadOps ThreadOps::INVALID(0); 
+
+/**
+ * Detect OS at runtime and attempt to locate the SwitchToThread
+ * function, which will assist in making the spin lock implementation
+ * which use ThreadOps::yield() a bit fairer.
+ */
+class YieldOps {
+
+  typedef BOOL (*Yield)(void);
+  Yield _fnYield;
+
+public:
+
+  YieldOps() : _fnYield(NULL) {
+
+    OSVERSIONINFO v;
+    v.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+
+    if(::GetVersionEx(&v) && (v.dwPlatformId == VER_PLATFORM_WIN32_NT)) {
+    
+       // Uses GetModuleHandle() so the reference count on the dll is
+       // not affected. There is a warning about race conditions involving
+       // this function being called as FreeLibrary() completes; however 
+       // nearly all win32 applications load this particular and will keep it
+       // in memory until the process exits.
+       HINSTANCE hInst = ::GetModuleHandle("Kernel32.dll");
+       if(hInst != NULL)
+         _fnYield = (Yield)::GetProcAddress(hInst, "SwitchToThread");
+
+       // REMIND: possibly need to use _T() macro for these strings
+    }
+
+  }
+
+  bool operator()() {
+  
+    // Attempt to yield using the best function available
+    if(!_fnYield || !_fnYield()) 
+      ::Sleep(0);  
+
+    return true;
+
+  }
+
+};
+
+bool ThreadOps::join(ThreadOps* ops) {
+
+  assert(ops);
+  assert(ops->_tid != 0);
+  assert(ops->_hThread != NULL);
+  
+  if(::WaitForSingleObjectEx(ops->_hThread, INFINITE, FALSE) != WAIT_OBJECT_0) 
+    return false;
+
+  ::CloseHandle(ops->_hThread);
+  ops->_hThread = NULL;
+
+  return true;
+
+}
+
+bool ThreadOps::yield() {
+
+  static YieldOps yielder;
+
+  yielder();
+
+  return true;
+
+}
+
+bool ThreadOps::setPriority(ThreadOps* impl, Priority p) {
+
+  assert(impl);
+ 
+#if !defined(ZTHREAD_DISABLE_PRIORITY)
+
+  bool result;
+  
+  // Convert
+  int n;
+  switch(p) {
+  case Low:
+    n = THREAD_PRIORITY_BELOW_NORMAL;
+    break;
+  case High:
+    n = THREAD_PRIORITY_ABOVE_NORMAL;
+    break;
+  case Medium:
+  default:
+    n = THREAD_PRIORITY_NORMAL;
+  }
+
+  
+  result = (::SetThreadPriority(impl->_hThread, n) != THREAD_PRIORITY_ERROR_RETURN);
+  return result;
+
+#else
+
+  return true;
+
+#endif
+
+}
+
+bool ThreadOps::getPriority(ThreadOps* impl, Priority& p) {
+
+  assert(impl);
+  bool result = true;
+  
+#if !defined(ZTHREAD_DISABLE_PRIORITY)
+
+  // Convert to one of the PRIORITY values
+  switch(::GetThreadPriority(impl->_hThread)) {
+    case THREAD_PRIORITY_ERROR_RETURN:
+      result = false;
+    case THREAD_PRIORITY_BELOW_NORMAL:
+      p = Low;
+      break;
+    case THREAD_PRIORITY_ABOVE_NORMAL:
+      p = High;
+      break;
+    case THREAD_PRIORITY_NORMAL:
+    default:
+      p = Medium;
+  }
+  
+#endif
+
+  return result;
+
+}
+
+
+bool ThreadOps::spawn(Runnable* task) {
+
+// Start the thread.
+#if defined(HAVE_BEGINTHREADEX)
+  _hThread = (HANDLE)::_beginthreadex(0, 0, &_dispatch, task, 0, (unsigned int*)&_tid);
+#else
+  _hThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)&_dispatch, task, 0, (DWORD*)&_tid);
+#endif
+
+  return _hThread != NULL;
+
+}
+
+unsigned int __stdcall ThreadOps::_dispatch(void *arg) {
+
+  Runnable* task = reinterpret_cast<Runnable*>(arg);
+  assert(task);
+
+  // Run the task from the correct context
+  task->run();
+
+  // Exit the thread
+#if defined(HAVE_BEGINTHREADEX)
+  ::_endthreadex(0);
+#else
+  ExitThread(0);
+#endif
+
+  return 0;
+  
+}
+
+}