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 40 /* initWithDriver() can be used to configure libbinder to use 41 * a different binder driver dev node. It must be called *before* 42 * any call to ProcessState::self(). The default is /dev/vndbinder 43 * for processes built with the VNDK and /dev/binder for those 44 * which are not. 45 */ 46 static sp<ProcessState> initWithDriver(const char *driver); 47 48 sp<IBinder> getContextObject(const sp<IBinder>& caller); 49 50 void startThreadPool(); 51 52 typedef bool (*context_check_func)(const String16& name, 53 const sp<IBinder>& caller, 54 void* userData); 55 56 bool becomeContextManager( 57 context_check_func checkFunc, 58 void* userData); 59 60 sp<IBinder> getStrongProxyForHandle(int32_t handle); 61 void expungeHandle(int32_t handle, IBinder* binder); 62 63 void spawnPooledThread(bool isMain); 64 65 status_t setThreadPoolMaxThreadCount(size_t maxThreads); 66 void giveThreadPoolName(); 67 68 String8 getDriverName(); 69 70 ssize_t getKernelReferences(size_t count, uintptr_t* buf); 71 72 // Only usable by the context manager. 73 // This refcount includes: 74 // 1. Strong references to the node by this and other processes 75 // 2. Temporary strong references held by the kernel during a 76 // transaction on the node. 77 // It does NOT include local strong references to the node 78 ssize_t getStrongRefCountForNodeByHandle(int32_t handle); 79 80 enum class CallRestriction { 81 // all calls okay 82 NONE, 83 // log when calls are blocking 84 ERROR_IF_NOT_ONEWAY, 85 // abort process on blocking calls 86 FATAL_IF_NOT_ONEWAY, 87 }; 88 // Sets calling restrictions for all transactions in this process. This must be called 89 // before any threads are spawned. 90 void setCallRestriction(CallRestriction restriction); 91 92 private: 93 friend class IPCThreadState; 94 95 explicit ProcessState(const char* driver); 96 ~ProcessState(); 97 98 ProcessState(const ProcessState& o); 99 ProcessState& operator=(const ProcessState& o); 100 String8 makeBinderThreadName(); 101 102 struct handle_entry { 103 IBinder* binder; 104 RefBase::weakref_type* refs; 105 }; 106 107 handle_entry* lookupHandleLocked(int32_t handle); 108 109 String8 mDriverName; 110 int mDriverFD; 111 void* mVMStart; 112 113 // Protects thread count variable below. 114 pthread_mutex_t mThreadCountLock; 115 pthread_cond_t mThreadCountDecrement; 116 // Number of binder threads current executing a command. 117 size_t mExecutingThreadsCount; 118 // Maximum number for binder threads allowed for this process. 119 size_t mMaxThreads; 120 // Time when thread pool was emptied 121 int64_t mStarvationStartTimeMs; 122 123 mutable Mutex mLock; // protects everything below. 124 125 Vector<handle_entry>mHandleToObject; 126 127 context_check_func mBinderContextCheckFunc; 128 void* mBinderContextUserData; 129 130 String8 mRootDir; 131 bool mThreadPoolStarted; 132 volatile int32_t mThreadPoolSeq; 133 134 CallRestriction mCallRestriction; 135 }; 136 137 } // namespace android 138 139 // --------------------------------------------------------------------------- 140 141 #endif // ANDROID_PROCESS_STATE_H 142