77 }
78 }
74 行调用 JavaVMExt 类的 LoadNativeLibrary()函数来加载.so 文件，
filename 是.so 文件的路径，detail 用于存储加载过程中的 log 信息。
LoadNativeLibrary()的关键代码如下：
bool JavaVMExt::LoadNativeLibrary(const std::string& path,
3226 Handle<mirror::ClassLoader> class_loader,
3227 std::string* detail) {
3228 detail->clear();
3229//首先检查是否加载过该.so，加载过就不需要重复加载
3234 SharedLibrary* library;
3235 Thread* self = Thread::Current();
3236 {
3238 MutexLock mu(self, libraries_lock);
3239 library = libraries->Get(path);
3240 }
3241 if (library != nullptr) {
3242 if (library->GetClassLoader() != class_loader.Get()) {
3246 StringAppendF(detail, "Shared library \"%s\" already opened by "
3247 "ClassLoader %p; can't open in ClassLoader %p",
3248 path.c_str(), library->GetClassLoader(), class_loader.Get());
3249 LOG(WARNING) << detail;
3250 return false;
3251 }
3252 … …
3254 if (!library->CheckOnLoadResult()) {
3255 StringAppendF(detail, "JNI_OnLoad failed on a previous attempt "
3256 "to load \"%s\"", path.c_str());
3257 return false;
3258 }
3259 return true;
3260 }
3261//之前没有加载过
3275 self->TransitionFromRunnableToSuspended(kWaitingForJniOnLoad);
3276 const char* path_str = path.empty() ? nullptr : path.c_str();
3277 void* handle = dlopen(path_str, RTLD_LAZY); //用 dlopen 加载.so 文件
3279 … …
3285 self->TransitionFromSuspendedToRunnable();
3286 … …
3297 bool created_library = false;
3298 {
3299 MutexLock mu(self, libraries_lock);
