tor-browser

The Tor Browser
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AndroidProcessPriority.cpp (2322B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
      6 
      7 #include "Hal.h"
      8 
      9 #include "mozilla/java/GeckoProcessManagerWrappers.h"
     10 #include "mozilla/java/GeckoProcessTypeWrappers.h"
     11 #include "mozilla/java/ServiceAllocatorWrappers.h"
     12 
     13 using namespace mozilla::hal;
     14 
     15 /**
     16 * Bucket the Gecko HAL process priority level into one of the three Android
     17 * priority levels.
     18 */
     19 static mozilla::java::ServiceAllocator::PriorityLevel::LocalRef
     20 ToJavaPriorityLevel(const ProcessPriority aPriority) {
     21  if (aPriority >= PROCESS_PRIORITY_FOREGROUND) {
     22    return mozilla::java::ServiceAllocator::PriorityLevel::FOREGROUND();
     23  } else if (aPriority <= PROCESS_PRIORITY_PREALLOC &&
     24             aPriority >= PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) {
     25    return mozilla::java::ServiceAllocator::PriorityLevel::BACKGROUND();
     26  }
     27 
     28  return mozilla::java::ServiceAllocator::PriorityLevel::IDLE();
     29 }
     30 
     31 namespace mozilla {
     32 namespace hal_impl {
     33 
     34 void SetProcessPriority(int aPid, ProcessPriority aPriority) {
     35  if (aPriority == PROCESS_PRIORITY_PARENT_PROCESS) {
     36    // This is the parent process itself, which we do not control.
     37    return;
     38  }
     39 
     40  const int32_t intPriority = static_cast<int32_t>(aPriority);
     41  if (intPriority < 0 || intPriority >= NUM_PROCESS_PRIORITY) {
     42    return;
     43  }
     44 
     45  auto contentProcType = java::GeckoProcessType::CONTENT();
     46  auto selector =
     47      java::GeckoProcessManager::Selector::New(contentProcType, aPid);
     48  auto priorityLevel = ToJavaPriorityLevel(aPriority);
     49 
     50  // To Android, a lower-valued integer is a higher relative priority.
     51  // We take the integer value of the enum and subtract it from the value
     52  // of the highest Gecko priority level to obtain a 0-based indicator of
     53  // the relative priority within the Java PriorityLevel.
     54  const int32_t relativeImportance =
     55      (static_cast<int32_t>(NUM_PROCESS_PRIORITY) - 1) - intPriority;
     56 
     57  java::GeckoProcessManager::SetProcessPriority(selector, priorityLevel,
     58                                                relativeImportance);
     59 }
     60 
     61 }  // namespace hal_impl
     62 }  // namespace mozilla