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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     static  sp<ProcessState>    selfOrNull();
     39     /* initWithDriver() can be used to configure libbinder to use
     40      * a different binder driver dev node. It must be called *before*
     41      * any call to ProcessState::self(). /dev/binder remains the default.
     42      */
     43     static  sp<ProcessState>    initWithDriver(const char *driver);
     44 
     45             void                setContextObject(const sp<IBinder>& object);
     46             sp<IBinder>         getContextObject(const sp<IBinder>& caller);
     47 
     48             void                setContextObject(const sp<IBinder>& object,
     49                                                  const String16& name);
     50             sp<IBinder>         getContextObject(const String16& name,
     51                                                  const sp<IBinder>& caller);
     52 
     53             void                startThreadPool();
     54 
     55     typedef bool (*context_check_func)(const String16& name,
     56                                        const sp<IBinder>& caller,
     57                                        void* userData);
     58 
     59             bool                isContextManager(void) const;
     60             bool                becomeContextManager(
     61                                     context_check_func checkFunc,
     62                                     void* userData);
     63 
     64             sp<IBinder>         getStrongProxyForHandle(int32_t handle);
     65             wp<IBinder>         getWeakProxyForHandle(int32_t handle);
     66             void                expungeHandle(int32_t handle, IBinder* binder);
     67 
     68             void                spawnPooledThread(bool isMain);
     69 
     70             status_t            setThreadPoolMaxThreadCount(size_t maxThreads);
     71             void                giveThreadPoolName();
     72 
     73             String8             getDriverName();
     74 
     75             ssize_t             getKernelReferences(size_t count, uintptr_t* buf);
     76 
     77 private:
     78     friend class IPCThreadState;
     79 
     80                                 ProcessState(const char* driver);
     81                                 ~ProcessState();
     82 
     83                                 ProcessState(const ProcessState& o);
     84             ProcessState&       operator=(const ProcessState& o);
     85             String8             makeBinderThreadName();
     86 
     87             struct handle_entry {
     88                 IBinder* binder;
     89                 RefBase::weakref_type* refs;
     90             };
     91 
     92             handle_entry*       lookupHandleLocked(int32_t handle);
     93 
     94             String8             mDriverName;
     95             int                 mDriverFD;
     96             void*               mVMStart;
     97 
     98             // Protects thread count variable below.
     99             pthread_mutex_t     mThreadCountLock;
    100             pthread_cond_t      mThreadCountDecrement;
    101             // Number of binder threads current executing a command.
    102             size_t              mExecutingThreadsCount;
    103             // Maximum number for binder threads allowed for this process.
    104             size_t              mMaxThreads;
    105             // Time when thread pool was emptied
    106             int64_t             mStarvationStartTimeMs;
    107 
    108     mutable Mutex               mLock;  // protects everything below.
    109 
    110             Vector<handle_entry>mHandleToObject;
    111 
    112             bool                mManagesContexts;
    113             context_check_func  mBinderContextCheckFunc;
    114             void*               mBinderContextUserData;
    115 
    116             KeyedVector<String16, sp<IBinder> >
    117                                 mContexts;
    118 
    119 
    120             String8             mRootDir;
    121             bool                mThreadPoolStarted;
    122     volatile int32_t            mThreadPoolSeq;
    123 };
    124 
    125 }; // namespace android
    126 
    127 // ---------------------------------------------------------------------------
    128 
    129 #endif // ANDROID_PROCESS_STATE_H
    130