dalvik/vm/os/os.h

   1 /*
   2  * Copyright (C) 2011 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 struct Thread;
  18
  19 /*
  20  * Raises the scheduling priority of the current thread.  Returns the
  21  * original priority if successful, or INT_MAX on failure.
  22  * Use os_lowerThreadPriority to undo.
  23  *
  24  * TODO: does the GC really need this?
  25  */
  26 int os_raiseThreadPriority();
  27
  28 /*
  29  * Sets the current thread scheduling priority. Used to undo the effects
  30  * of an earlier call to os_raiseThreadPriority.
  31  *
  32  * TODO: does the GC really need this?
  33  */
  34 void os_lowerThreadPriority(int oldThreadPriority);
  35
  36 /*
  37  * Changes the priority of a system thread to match that of the Thread object.
  38  *
  39  * We map a priority value from 1-10 to Linux "nice" values, where lower
  40  * numbers indicate higher priority.
  41  */
  42 void os_changeThreadPriority(Thread* thread, int newPriority);
  43
  44 /*
  45  * Returns the thread priority for the current thread by querying the system.
  46  * This is useful when attaching a thread through JNI.
  47  *
  48  * Returns a value from 1 to 10 (compatible with java.lang.Thread values).
  49  */
  50 int os_getThreadPriorityFromSystem();