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 #define LOG_TAG "misc" 18 19 // 20 // Miscellaneous utility functions. 21 // 22 #include <utils/misc.h> 23 #include <utils/Log.h> 24 25 #include <sys/stat.h> 26 #include <string.h> 27 #include <errno.h> 28 #include <stdio.h> 29 30 #if defined(HAVE_PTHREADS) 31 # include <pthread.h> 32 #endif 33 34 #include <utils/Vector.h> 35 36 using namespace android; 37 38 namespace android { 39 40 struct sysprop_change_callback_info { 41 sysprop_change_callback callback; 42 int priority; 43 }; 44 45 #if defined(HAVE_PTHREADS) 46 static pthread_mutex_t gSyspropMutex = PTHREAD_MUTEX_INITIALIZER; 47 static Vector<sysprop_change_callback_info>* gSyspropList = NULL; 48 #endif 49 add_sysprop_change_callback(sysprop_change_callback cb,int priority)50void add_sysprop_change_callback(sysprop_change_callback cb, int priority) { 51 #if defined(HAVE_PTHREADS) 52 pthread_mutex_lock(&gSyspropMutex); 53 if (gSyspropList == NULL) { 54 gSyspropList = new Vector<sysprop_change_callback_info>(); 55 } 56 sysprop_change_callback_info info; 57 info.callback = cb; 58 info.priority = priority; 59 bool added = false; 60 for (size_t i=0; i<gSyspropList->size(); i++) { 61 if (priority >= gSyspropList->itemAt(i).priority) { 62 gSyspropList->insertAt(info, i); 63 added = true; 64 break; 65 } 66 } 67 if (!added) { 68 gSyspropList->add(info); 69 } 70 pthread_mutex_unlock(&gSyspropMutex); 71 #endif 72 } 73 report_sysprop_change()74void report_sysprop_change() { 75 #if defined(HAVE_PTHREADS) 76 pthread_mutex_lock(&gSyspropMutex); 77 Vector<sysprop_change_callback_info> listeners; 78 if (gSyspropList != NULL) { 79 listeners = *gSyspropList; 80 } 81 pthread_mutex_unlock(&gSyspropMutex); 82 83 //ALOGI("Reporting sysprop change to %d listeners", listeners.size()); 84 for (size_t i=0; i<listeners.size(); i++) { 85 listeners[i].callback(); 86 } 87 #endif 88 } 89 90 }; // namespace android 91