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      1 /*
      2  * Copyright (C) 2005 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 #ifndef ANDROID_HARDWARE_PROCESS_STATE_H
     18 #define ANDROID_HARDWARE_PROCESS_STATE_H
     19 
     20 #include <hwbinder/IBinder.h>
     21 #include <utils/KeyedVector.h>
     22 #include <utils/String8.h>
     23 #include <utils/String16.h>
     24 
     25 #include <utils/threads.h>
     26 
     27 #include <pthread.h>
     28 
     29 // ---------------------------------------------------------------------------
     30 namespace android {
     31 namespace hardware {
     32 
     33 class IPCThreadState;
     34 
     35 class ProcessState : public virtual RefBase
     36 {
     37 public:
     38     static  sp<ProcessState>    self();
     39 
     40             void                setContextObject(const sp<IBinder>& object);
     41             sp<IBinder>         getContextObject(const sp<IBinder>& caller);
     42 
     43             void                setContextObject(const sp<IBinder>& object,
     44                                                  const String16& name);
     45             sp<IBinder>         getContextObject(const String16& name,
     46                                                  const sp<IBinder>& caller);
     47 
     48             void                startThreadPool();
     49 
     50     typedef bool (*context_check_func)(const String16& name,
     51                                        const sp<IBinder>& caller,
     52                                        void* userData);
     53 
     54             bool                isContextManager(void) const;
     55             bool                becomeContextManager(
     56                                     context_check_func checkFunc,
     57                                     void* userData);
     58 
     59             sp<IBinder>         getStrongProxyForHandle(int32_t handle);
     60             wp<IBinder>         getWeakProxyForHandle(int32_t handle);
     61             void                expungeHandle(int32_t handle, IBinder* binder);
     62 
     63             void                spawnPooledThread(bool isMain);
     64 
     65             status_t            setThreadPoolConfiguration(size_t maxThreads, bool callerJoinsPool);
     66             void                giveThreadPoolName();
     67 
     68 private:
     69     friend class IPCThreadState;
     70 
     71                                 ProcessState();
     72                                 ~ProcessState();
     73 
     74                                 ProcessState(const ProcessState& o);
     75             ProcessState&       operator=(const ProcessState& o);
     76             String8             makeBinderThreadName();
     77 
     78             struct handle_entry {
     79                 IBinder* binder;
     80                 RefBase::weakref_type* refs;
     81             };
     82 
     83             handle_entry*       lookupHandleLocked(int32_t handle);
     84 
     85             int                 mDriverFD;
     86             void*               mVMStart;
     87 
     88             // Protects thread count variable below.
     89             pthread_mutex_t     mThreadCountLock;
     90             pthread_cond_t      mThreadCountDecrement;
     91             // Number of binder threads current executing a command.
     92             size_t              mExecutingThreadsCount;
     93             // Maximum number for binder threads allowed for this process.
     94             size_t              mMaxThreads;
     95             // Time when thread pool was emptied
     96             int64_t             mStarvationStartTimeMs;
     97 
     98     mutable Mutex               mLock;  // protects everything below.
     99 
    100             Vector<handle_entry>mHandleToObject;
    101 
    102             bool                mManagesContexts;
    103             context_check_func  mBinderContextCheckFunc;
    104             void*               mBinderContextUserData;
    105 
    106             KeyedVector<String16, sp<IBinder> >
    107                                 mContexts;
    108 
    109 
    110             String8             mRootDir;
    111             bool                mThreadPoolStarted;
    112             bool                mSpawnThreadOnStart;
    113     volatile int32_t            mThreadPoolSeq;
    114 };
    115 
    116 }; // namespace hardware
    117 }; // namespace android
    118 
    119 // ---------------------------------------------------------------------------
    120 
    121 #endif // ANDROID_HARDWARE_PROCESS_STATE_H
    122