67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
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/* libs/cutils/iosched_policy.c
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**
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef HAVE_SCHED_H
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#include <cutils/iosched_policy.h>
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extern int ioprio_set(int which, int who, int ioprio);
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enum {
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WHO_PROCESS = 1,
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WHO_PGRP,
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WHO_USER,
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};
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#define CLASS_SHIFT 13
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#define IOPRIO_NORM 4
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int android_set_ioprio(int pid, IoSchedClass clazz, int ioprio) {
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#ifdef HAVE_ANDROID_OS
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if (ioprio_set(WHO_PROCESS, pid, ioprio | (clazz << CLASS_SHIFT))) {
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return -1;
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}
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#endif
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return 0;
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}
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int android_get_ioprio(int pid, IoSchedClass *clazz, int *ioprio) {
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#ifdef HAVE_ANDROID_OS
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int rc;
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if ((rc = ioprio_get(WHO_PROCESS, pid)) < 0) {
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return -1;
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}
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*clazz = (rc >> CLASS_SHIFT);
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*ioprio = (rc & 0xff);
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#else
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*clazz = IoSchedClass_NONE;
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*ioprio = 0;
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#endif
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return 0;
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}
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#endif /* HAVE_SCHED_H */
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