84   for (auto& entry : stack_traces) {  in ctor()  local
85     entry.backtrace.reserve(kStackDepth);  in ctor()
124     if (FdEntry* entry = GetFdEntry(event->fd); entry) {  in fd_hook()  local
125       std::lock_guard<std::mutex> lock(entry->mutex);  in fd_hook()
126       entry->backtrace.clear();  in fd_hook()
130         entry->backtrace = std::move(data.frames);  in fd_hook()
134     if (FdEntry* entry = GetFdEntry(event->fd); entry) {  in fd_hook()  local
135       std::lock_guard<std::mutex> lock(entry->mutex);  in fd_hook()
136       entry->backtrace.clear();  in fd_hook()
147     FdEntry* entry = GetFdEntry(fd);  in fdtrack_iterate()  local
148     if (!entry) {  in fdtrack_iterate()
152     if (!entry->mutex.try_lock()) {  in fdtrack_iterate()
157     if (entry->backtrace.empty()) {  in fdtrack_iterate()
158       entry->mutex.unlock();  in fdtrack_iterate()
160     } else if (entry->backtrace.size() < 2) {  in fdtrack_iterate()
162                             entry->backtrace.size());  in fdtrack_iterate()
164       entry->mutex.unlock();  in fdtrack_iterate()
168     for (size_t i = 0; i < entry->backtrace.size(); ++i) {  in fdtrack_iterate()
169       function_names[i] = entry->backtrace[i].function_name.c_str();  in fdtrack_iterate()
170       function_offsets[i] = entry->backtrace[i].function_offset;  in fdtrack_iterate()
174         callback(fd, function_names, function_offsets, entry->backtrace.size(), arg);  in fdtrack_iterate()
176     entry->mutex.unlock();  in fdtrack_iterate()