1 /*
2 * Copyright (C) 2012 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 #define LOG_TAG "SchedulingPolicyService"
18 //#define LOG_NDEBUG 0
19
20 #include <binder/IServiceManager.h>
21 #include <utils/Mutex.h>
22 #include "ISchedulingPolicyService.h"
23 #include "SchedulingPolicyService.h"
24
25 namespace android {
26
27 static sp<ISchedulingPolicyService> sSchedulingPolicyService;
28 static const String16 _scheduling_policy("scheduling_policy");
29 static Mutex sMutex;
30
requestPriority(pid_t pid,pid_t tid,int32_t prio,bool asynchronous)31 int requestPriority(pid_t pid, pid_t tid, int32_t prio, bool asynchronous)
32 {
33 // FIXME merge duplicated code related to service lookup, caching, and error recovery
34 int ret;
35 for (;;) {
36 sMutex.lock();
37 sp<ISchedulingPolicyService> sps = sSchedulingPolicyService;
38 sMutex.unlock();
39 if (sps == 0) {
40 sp<IBinder> binder = defaultServiceManager()->checkService(_scheduling_policy);
41 if (binder == 0) {
42 sleep(1);
43 continue;
44 }
45 sps = interface_cast<ISchedulingPolicyService>(binder);
46 sMutex.lock();
47 sSchedulingPolicyService = sps;
48 sMutex.unlock();
49 }
50 ret = sps->requestPriority(pid, tid, prio, asynchronous);
51 if (ret != DEAD_OBJECT) {
52 break;
53 }
54 ALOGW("SchedulingPolicyService died");
55 sMutex.lock();
56 sSchedulingPolicyService.clear();
57 sMutex.unlock();
58 }
59 return ret;
60 }
61
62 } // namespace android
63