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