Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 106 insertions, 0 deletions

diff --git a/base/process.h b/base/process.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_PROCESS_H__
+#define BASE_PROCESS_H__
+
+#include <windows.h>
+#include "base/basictypes.h"
+
+// ProcessHandle is a platform specific type which represents the underlying OS
+// handle to a process.
+#ifdef WIN32
+typedef HANDLE ProcessHandle;
+#else
+typedef int ProcessHandle;
+#endif
+
+// A Process
+// TODO(mbelshe): Replace existing code which uses the ProcessHandle w/ the
+//                Process object where relevant.
+class Process {
+ public:
+  Process() : process_(0), last_working_set_size_(0) {}
+  explicit Process(ProcessHandle handle) :
+    process_(handle), last_working_set_size_(0) {}
+
+  // A handle to the current process.
+  static Process Current();
+
+  // Get/Set the handle for this process.
+  ProcessHandle handle() { return process_; }
+  void set_handle(ProcessHandle handle) { process_ = handle; }
+
+  // Get the PID for this process.
+  int32 pid() const;
+
+  // Is the this process the current process.
+  bool is_current() const;
+
+  // Close the Process Handle.
+  void Close() {
+    CloseHandle(process_);
+    process_ = 0;
+  }
+
+  // A process is backgrounded when it's priority is lower than normal.
+  // Return true if this process is backgrounded, false otherwise.
+  bool IsProcessBackgrounded();
+
+  // Set a prcess as backgrounded.  If value is true, the priority
+  // of the process will be lowered.  If value is false, the priority
+  // of the process will be made "normal" - equivalent to default
+  // process priority.
+  // Returns true if the priority was changed, false otherwise.
+  bool SetProcessBackgrounded(bool value);
+
+  // Reduces the working set of memory used by the process.
+  // The algorithm used by this function is intentionally vague.  Repeated calls
+  // to this function consider the process' previous required Working Set sizes
+  // to determine a reasonable reduction.  This helps give memory back to the OS
+  // in increments without over releasing memory.
+  // When the WorkingSet is reduced, it is permanent, until the caller calls
+  // UnReduceWorkingSet.
+  // Returns true if successful, false otherwise.
+  bool ReduceWorkingSet();
+
+  // Undoes the effects of prior calls to ReduceWorkingSet().
+  // Returns true if successful, false otherwise.
+  bool UnReduceWorkingSet();
+
+  // Releases as much of the working set back to the OS as possible.
+  // Returns true if successful, false otherwise.
+  bool EmptyWorkingSet();
+
+ private:
+  ProcessHandle process_;
+  size_t last_working_set_size_;
+};
+
+#endif  // BASE_PROCESS_H__