content/public/browser/zygote_host_linux.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_
   6 #define CONTENT_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_
   7
   8 #include <unistd.h>
   9
  10 #include "base/process.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace content {
  14
  15 // http://code.google.com/p/chromium/wiki/LinuxZygote
  16
  17 // The zygote host is the interface, in the browser process, to the zygote
  18 // process.
  19 class ZygoteHost {
  20  public:
  21   // Returns the singleton instance.
  22   CONTENT_EXPORT static ZygoteHost* GetInstance();
  23
  24   virtual ~ZygoteHost() {}
  25
  26   // Returns the pid of the Zygote process.
  27   virtual pid_t GetPid() const = 0;
  28
  29   // Returns the pid of the Sandbox Helper process.
  30   virtual pid_t GetSandboxHelperPid() const = 0;
  31
  32   // Returns an int which is a bitmask of kSandboxLinux* values. Only valid
  33   // after the first render has been forked.
  34   virtual int GetSandboxStatus() const = 0;
  35
  36   // Adjust the OOM score of the given renderer's PID.  The allowed
  37   // range for the score is [0, 1000], where higher values are more
  38   // likely to be killed by the OOM killer.
  39   virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
  40                                       int score) = 0;
  41
  42   // Adjust the point at which the low memory notifier in the kernel tells
  43   // us that we're low on memory.  When there is less than |margin_mb| left,
  44   // then the notifier will notify us.  Set |margin_mb| to -1 to turn off
  45   // low memory notification altogether.
  46   virtual void AdjustLowMemoryMargin(int64 margin_mb) = 0;
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_