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      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 
     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