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| 1 /* | |
| 2 * Copyright 2014 The Chromium Authors. All rights reserved. | |
| 3 * Use of this source code is governed by a BSD-style license that can be | |
| 4 * found in the LICENSE file. | |
| 5 */ | |
| 6 | |
| 7 // | |
| 8 // Post-message based test for simple rpc based access to name services. | |
| 9 // | |
| 10 | |
| 11 #include <string> | |
| 12 | |
| 13 #include <assert.h> | |
| 14 #include <stdio.h> | |
| 15 #include <stdlib.h> | |
| 16 #include <inttypes.h> | |
| 17 #include <sys/fcntl.h> | |
| 18 #include <string.h> | |
| 19 #include <unistd.h> | |
| 20 #include <pthread.h> | |
| 21 | |
| 22 #include "native_client/src/include/nacl_base.h" | |
| 23 #include "native_client/src/public/imc_syscalls.h" | |
| 24 #include "native_client/src/public/name_service.h" | |
| 25 #include "native_client/src/shared/platform/nacl_sync.h" | |
| 26 #include "native_client/src/shared/platform/nacl_sync_checked.h" | |
| 27 #include "native_client/src/shared/platform/nacl_sync_raii.h" | |
| 28 #include "native_client/src/shared/srpc/nacl_srpc.h" | |
| 29 | |
| 30 // TODO(bsy): move weak_ref module to the shared directory | |
| 31 #include "native_client/src/trusted/weak_ref/weak_ref.h" | |
| 32 | |
| 33 #include "ppapi/cpp/instance.h" | |
| 34 #include "ppapi/cpp/module.h" | |
| 35 #include "ppapi/cpp/var.h" | |
| 36 | |
| 37 #include "ppapi/native_client/src/trusted/weak_ref/call_on_main_thread.h" | |
| 38 #include "ppapi/native_client/src/untrusted/nacl_ppapi_util/nacl_ppapi_util.h" | |
| 39 #include "ppapi/native_client/src/untrusted/nacl_ppapi_util/string_buffer.h" | |
| 40 | |
| 41 class PostStringMessageWrapper | |
| 42 : public nacl_ppapi::EventThreadWorkStateWrapper<nacl_ppapi::VoidResult> { | |
| 43 public: | |
| 44 PostStringMessageWrapper(nacl_ppapi::EventThreadWorkState< | |
| 45 nacl_ppapi::VoidResult> | |
| 46 *state, | |
| 47 const std::string &msg) | |
| 48 : nacl_ppapi::EventThreadWorkStateWrapper<nacl_ppapi::VoidResult>( | |
| 49 state), | |
| 50 msg_(msg) {} | |
| 51 ~PostStringMessageWrapper(); | |
| 52 const std::string &msg() const { return msg_; } | |
| 53 private: | |
| 54 std::string msg_; | |
| 55 | |
| 56 DISALLOW_COPY_AND_ASSIGN(PostStringMessageWrapper); | |
| 57 }; | |
| 58 | |
| 59 // --------------------------------------------------------------------------- | |
| 60 | |
| 61 class MyInstance; | |
| 62 | |
| 63 struct WorkRequest { | |
| 64 explicit WorkRequest(const std::string &message) | |
| 65 : msg(message), | |
| 66 next(reinterpret_cast<WorkRequest *>(NULL)) {} | |
| 67 std::string msg; // copied from HandleMessage | |
| 68 WorkRequest *next; | |
| 69 private: | |
| 70 DISALLOW_COPY_AND_ASSIGN(WorkRequest); | |
| 71 }; | |
| 72 | |
| 73 // A Worker object is associated with a single worker thread and a | |
| 74 // plugin instance (which may be associated with multiple Worker | |
| 75 // objects/threads). It is created by a plugin instance (on the event | |
| 76 // handler thread) with a refcount of 2, with the expectation that one | |
| 77 // reference will be immediately handed off to its associated worker | |
| 78 // thread. When the plugin instance is about to be destroyed in the | |
| 79 // event handler thread, the event handler should invoke the | |
| 80 // ShouldExit member function, which automatically decrements the | |
| 81 // reference associated with the event handler thread (i.e., the event | |
| 82 // handler thread should no longer use the Worker*). | |
| 83 class Worker { | |
| 84 public: | |
| 85 explicit Worker(MyInstance *instance); | |
| 86 | |
| 87 // RunToCompletion should be invoked in the worker thread. It | |
| 88 // returns when the plugin instance went away, and will | |
| 89 // automatically unref the Worker object, so the worker thread | |
| 90 // should no longer use the Worker object pointer after invoking | |
| 91 // RunToCompletion(). | |
| 92 void RunToCompletion(); | |
| 93 | |
| 94 WorkRequest *Dequeue(); | |
| 95 void Enqueue(WorkRequest *req); | |
| 96 | |
| 97 void Initialize(nacl::StringBuffer *sb); | |
| 98 void ManifestListTest(nacl::StringBuffer *sb); | |
| 99 void ManifestOpenTest(nacl::StringBuffer *sb); | |
| 100 | |
| 101 // Called on the event thread as part of the instance shutdown. | |
| 102 // Automatically unreferences the Worker object, so the event thread | |
| 103 // should stop using the Worker pointer after invoking ShouldExit. | |
| 104 void ShouldExit(); | |
| 105 | |
| 106 void Unref(); // used only for error cleanup, e.g., when the worker | |
| 107 // thread did not launch. | |
| 108 | |
| 109 bool InitializeChannel(nacl::StringBuffer *sb); | |
| 110 | |
| 111 protected: | |
| 112 // Event thread operation(s): | |
| 113 // | |
| 114 // In order for a test method to send reply messages, it should use | |
| 115 // this PostStringMessage method, since (currently) the PostMessage | |
| 116 // interface is event thread-only and not thread-safe. Returns true | |
| 117 // if successful and the thread should continue to do work, false | |
| 118 // otherwise (anchor has been abandoned). | |
| 119 bool PostStringMessage(const std::string &msg); | |
| 120 // ... more Event thread operations here. | |
| 121 | |
| 122 private: | |
| 123 MyInstance *instance_; // cannot use directly from test worker thread! | |
| 124 nacl::WeakRefAnchor *anchor_; | |
| 125 // must copy out and Ref in ctor, since instance_ might go bad at any time. | |
| 126 | |
| 127 NaClMutex mu_; | |
| 128 NaClCondVar cv_; // queue not empty or should_exit_ | |
| 129 | |
| 130 int ref_count_; | |
| 131 WorkRequest *queue_head_; | |
| 132 WorkRequest **queue_insert_; | |
| 133 | |
| 134 bool should_exit_; | |
| 135 | |
| 136 ~Worker(); | |
| 137 | |
| 138 WorkRequest *Dequeue_mu(); | |
| 139 void Enqueue_mu(WorkRequest *req); | |
| 140 | |
| 141 struct DispatchTable { | |
| 142 char const *op_name; | |
| 143 void (Worker::*mfunc)(nacl::StringBuffer *sb); | |
| 144 }; | |
| 145 | |
| 146 bool ns_channel_initialized_; | |
| 147 NaClSrpcChannel ns_channel_; | |
| 148 | |
| 149 static DispatchTable const kDispatch[]; // null terminated | |
| 150 | |
| 151 DISALLOW_COPY_AND_ASSIGN(Worker); | |
| 152 }; | |
| 153 | |
| 154 // This object represents one time the page says <embed>. | |
| 155 class MyInstance : public nacl_ppapi::NaClPpapiPluginInstance { | |
| 156 public: | |
| 157 explicit MyInstance(PP_Instance instance); | |
| 158 virtual ~MyInstance(); | |
| 159 virtual void HandleMessage(const pp::Var& message_data); | |
| 160 | |
| 161 Worker *worker() { return worker_; } | |
| 162 | |
| 163 // used with plugin::WeakRefCompletionCallback | |
| 164 void PostStringMessage_EventThread(PostStringMessageWrapper *msg_wrapper, | |
| 165 int32_t err); | |
| 166 private: | |
| 167 Worker *worker_; | |
| 168 | |
| 169 DISALLOW_COPY_AND_ASSIGN(MyInstance); | |
| 170 }; | |
| 171 | |
| 172 // --------------------------------------------------------------------------- | |
| 173 | |
| 174 PostStringMessageWrapper::~PostStringMessageWrapper() {} | |
| 175 | |
| 176 // --------------------------------------------------------------------------- | |
| 177 | |
| 178 MyInstance::MyInstance(PP_Instance instance) | |
| 179 : nacl_ppapi::NaClPpapiPluginInstance(instance), | |
| 180 worker_(new Worker(this)) { | |
| 181 } | |
| 182 | |
| 183 MyInstance::~MyInstance() { | |
| 184 worker_->ShouldExit(); | |
| 185 } | |
| 186 | |
| 187 void MyInstance::PostStringMessage_EventThread( | |
| 188 PostStringMessageWrapper *msg_wrapper, | |
| 189 int32_t err) { | |
| 190 PostMessage(msg_wrapper->msg()); | |
| 191 msg_wrapper->SetResult(nacl_ppapi::g_void_result); | |
| 192 } | |
| 193 | |
| 194 // --------------------------------------------------------------------------- | |
| 195 | |
| 196 Worker::Worker(MyInstance *instance) | |
| 197 : instance_(instance), | |
| 198 anchor_(instance->anchor()->Ref()), | |
| 199 ref_count_(2), // one for the master and one for the dame... | |
| 200 queue_head_(NULL), | |
| 201 queue_insert_(&queue_head_), | |
| 202 should_exit_(false), | |
| 203 ns_channel_initialized_(false) { | |
| 204 NaClXMutexCtor(&mu_); | |
| 205 NaClXCondVarCtor(&cv_); | |
| 206 } | |
| 207 | |
| 208 void Worker::Unref() { | |
| 209 bool do_delete; | |
| 210 do { | |
| 211 nacl::MutexLocker take(&mu_); | |
| 212 do_delete = (--ref_count_ == 0); | |
| 213 } while (0); | |
| 214 // dropped lock before invoking dtor | |
| 215 if (do_delete) { | |
| 216 delete this; | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 Worker::~Worker() { | |
| 221 anchor_->Unref(); | |
| 222 | |
| 223 WorkRequest *req; | |
| 224 while ((req = Dequeue_mu()) != NULL) { | |
| 225 delete req; | |
| 226 } | |
| 227 | |
| 228 NaClMutexDtor(&mu_); | |
| 229 NaClCondVarDtor(&cv_); | |
| 230 } | |
| 231 | |
| 232 void Worker::ShouldExit() { | |
| 233 do { | |
| 234 nacl::MutexLocker take(&mu_); | |
| 235 should_exit_ = true; | |
| 236 NaClXCondVarBroadcast(&cv_); | |
| 237 } while (0); | |
| 238 Unref(); | |
| 239 } | |
| 240 | |
| 241 WorkRequest *Worker::Dequeue_mu() { | |
| 242 WorkRequest *head = queue_head_; | |
| 243 | |
| 244 if (head != NULL) { | |
| 245 queue_head_ = head->next; | |
| 246 if (queue_head_ == NULL) { | |
| 247 queue_insert_ = &queue_head_; | |
| 248 } | |
| 249 } | |
| 250 return head; | |
| 251 } | |
| 252 | |
| 253 void Worker::Enqueue_mu(WorkRequest *req) { | |
| 254 req->next = NULL; | |
| 255 *queue_insert_ = req; | |
| 256 queue_insert_ = &req->next; | |
| 257 } | |
| 258 | |
| 259 WorkRequest *Worker::Dequeue() { | |
| 260 nacl::MutexLocker take(&mu_); | |
| 261 return Dequeue_mu(); | |
| 262 } | |
| 263 | |
| 264 void Worker::Enqueue(WorkRequest *req) { | |
| 265 nacl::MutexLocker take(&mu_); | |
| 266 Enqueue_mu(req); | |
| 267 NaClXCondVarBroadcast(&cv_); | |
| 268 } | |
| 269 | |
| 270 Worker::DispatchTable const Worker::kDispatch[] = { | |
| 271 { "init", &Worker::Initialize }, | |
| 272 { "manifest_open", &Worker::ManifestOpenTest }, | |
| 273 { reinterpret_cast<char const *>(NULL), NULL } | |
| 274 }; | |
| 275 | |
| 276 bool Worker::PostStringMessage(const std::string &msg) { | |
| 277 nacl_ppapi::EventThreadWorkState<nacl_ppapi::VoidResult> state; | |
| 278 plugin::WeakRefCallOnMainThread(anchor_, | |
| 279 0 /* mS */, | |
| 280 instance_, | |
| 281 &MyInstance::PostStringMessage_EventThread, | |
| 282 new PostStringMessageWrapper(&state, msg)); | |
| 283 if (NULL == state.WaitForCompletion()) { | |
| 284 // anchor_ has been abandoned, so the plugin instance went away. | |
| 285 // we should drop our ref to the anchor, then shut down the worker | |
| 286 // thread. | |
| 287 nacl::MutexLocker take(&mu_); | |
| 288 should_exit_ = true; | |
| 289 // There's no need to condvar broadcast, since it is the worker | |
| 290 // thread that will look at the work queue and the should_exit_ to | |
| 291 // act on this. Unfortunately every worker thread must test the | |
| 292 // return value of PostStringMessage to determine if it should do | |
| 293 // early exit (if the worker needs to do multiple event-thread | |
| 294 // operations). | |
| 295 return false; | |
| 296 } | |
| 297 return true; | |
| 298 } | |
| 299 | |
| 300 void Worker::RunToCompletion() { | |
| 301 for (;;) { | |
| 302 WorkRequest *req; | |
| 303 do { | |
| 304 nacl::MutexLocker take(&mu_); | |
| 305 for (;;) { | |
| 306 if (should_exit_) { | |
| 307 // drop the lock and drop the reference count to this | |
| 308 goto break_x3; | |
| 309 } | |
| 310 fprintf(stderr, "RunToCompletion: Dequeuing...\n"); | |
| 311 if ((req = Dequeue_mu()) != NULL) { | |
| 312 fprintf(stderr, "RunToCompletion: found work %p\n", | |
| 313 reinterpret_cast<void *>(req)); | |
| 314 break; | |
| 315 } | |
| 316 fprintf(stderr, "RunToCompletion: waiting\n"); | |
| 317 NaClXCondVarWait(&cv_, &mu_); | |
| 318 fprintf(stderr, "RunToCompletion: woke up\n"); | |
| 319 } | |
| 320 } while (0); | |
| 321 | |
| 322 // Do the work, without holding the lock. The work function | |
| 323 // should reacquire mu_ as needed. | |
| 324 | |
| 325 nacl::StringBuffer sb; | |
| 326 | |
| 327 // scan dispatch table for op_name | |
| 328 fprintf(stderr, "RunToCompletion: scanning for %s\n", req->msg.c_str()); | |
| 329 for (size_t ix = 0; kDispatch[ix].op_name != NULL; ++ix) { | |
| 330 fprintf(stderr, | |
| 331 "RunToCompletion: comparing against %s\n", kDispatch[ix].op_name); | |
| 332 if (req->msg == kDispatch[ix].op_name) { | |
| 333 if (InitializeChannel(&sb)) { | |
| 334 fprintf(stderr, "RunToCompletion: invoking table entry %u\n", ix); | |
| 335 (this->*(kDispatch[ix].mfunc))(&sb); | |
| 336 } | |
| 337 break; | |
| 338 } | |
| 339 } | |
| 340 // always post a reply, even if it is the empty string | |
| 341 fprintf(stderr, | |
| 342 "RunToCompletion: posting reply %s\n", sb.ToString().c_str()); | |
| 343 if (!PostStringMessage(sb.ToString())) { | |
| 344 break; | |
| 345 } | |
| 346 } | |
| 347 break_x3: | |
| 348 fprintf(stderr, "RunToCompletion: exiting\n"); | |
| 349 Unref(); | |
| 350 } | |
| 351 | |
| 352 bool Worker::InitializeChannel(nacl::StringBuffer *sb) { | |
| 353 if (ns_channel_initialized_) { | |
| 354 return true; | |
| 355 } | |
| 356 int ns = -1; | |
| 357 nacl_nameservice(&ns); | |
| 358 printf("ns = %d\n", ns); | |
| 359 assert(-1 != ns); | |
| 360 int connected_socket = imc_connect(ns); | |
| 361 assert(-1 != connected_socket); | |
| 362 if (!NaClSrpcClientCtor(&ns_channel_, connected_socket)) { | |
| 363 sb->Printf("Srpc client channel ctor failed\n"); | |
| 364 close(ns); | |
| 365 return false; | |
| 366 } | |
| 367 sb->Printf("NaClSrpcClientCtor succeeded\n"); | |
| 368 close(ns); | |
| 369 ns_channel_initialized_ = true; | |
| 370 return true; | |
| 371 } | |
| 372 | |
| 373 void Worker::Initialize(nacl::StringBuffer *sb) { | |
| 374 // we just want the log output from the InitializeChannel | |
| 375 return; | |
| 376 } | |
| 377 | |
| 378 void Worker::ManifestOpenTest(nacl::StringBuffer *sb) { | |
| 379 int status = -1; | |
| 380 int manifest; | |
| 381 struct NaClSrpcChannel manifest_channel; | |
| 382 | |
| 383 // name service lookup for the manifest service descriptor | |
| 384 if (NACL_SRPC_RESULT_OK != | |
| 385 NaClSrpcInvokeBySignature(&ns_channel_, NACL_NAME_SERVICE_LOOKUP, | |
| 386 "ManifestNameService", O_RDWR, | |
| 387 &status, &manifest) || | |
| 388 NACL_NAME_SERVICE_SUCCESS != status) { | |
| 389 sb->Printf("nameservice lookup failed, status %d\n", status); | |
| 390 return; | |
| 391 } | |
| 392 sb->Printf("Got manifest descriptor %d\n", manifest); | |
| 393 if (-1 == manifest) { | |
| 394 return; | |
| 395 } | |
| 396 | |
| 397 // connect to manifest name server | |
| 398 int manifest_conn = imc_connect(manifest); | |
| 399 close(manifest); | |
| 400 sb->Printf("got manifest connection %d\n", manifest_conn); | |
| 401 if (-1 == manifest_conn) { | |
| 402 sb->Printf("could not connect\n"); | |
| 403 return; | |
| 404 } | |
| 405 | |
| 406 // build the SRPC connection (do service discovery) | |
| 407 if (!NaClSrpcClientCtor(&manifest_channel, manifest_conn)) { | |
| 408 sb->Printf("could not build srpc client\n"); | |
| 409 return; | |
| 410 } | |
| 411 | |
| 412 int desc; | |
| 413 | |
| 414 sb->Printf("Invoking name service lookup\n"); | |
| 415 if (NACL_SRPC_RESULT_OK != | |
| 416 NaClSrpcInvokeBySignature(&manifest_channel, | |
| 417 NACL_NAME_SERVICE_LOOKUP, | |
| 418 "files/test_file", O_RDONLY, | |
| 419 &status, &desc)) { | |
| 420 sb->Printf("manifest lookup RPC failed\n"); | |
| 421 NaClSrpcDtor(&manifest_channel); | |
| 422 return; | |
| 423 } | |
| 424 | |
| 425 sb->DiscardOutput(); | |
| 426 sb->Printf("File Contents:\n"); | |
| 427 | |
| 428 char buffer[4096]; | |
| 429 int len; | |
| 430 while ((len = read(desc, buffer, sizeof buffer - 1)) > 0) { | |
| 431 // Null terminate. | |
| 432 buffer[len] = '\0'; | |
| 433 sb->Printf("%s", buffer); | |
| 434 } | |
| 435 NaClSrpcDtor(&manifest_channel); | |
| 436 return; | |
| 437 } | |
| 438 | |
| 439 // HandleMessage gets invoked when postMessage is called on the DOM | |
| 440 // element associated with this plugin instance. In this case, if we | |
| 441 // are given a string, we'll post a message back to JavaScript with a | |
| 442 // reply -- essentially treating this as a string-based RPC. | |
| 443 void MyInstance::HandleMessage(const pp::Var& message) { | |
| 444 if (message.is_string()) { | |
| 445 fprintf(stderr, | |
| 446 "HandleMessage: enqueuing %s\n", message.AsString().c_str()); | |
| 447 fflush(NULL); | |
| 448 worker_->Enqueue(new WorkRequest(message.AsString())); | |
| 449 } else { | |
| 450 fprintf(stderr, "HandleMessage: message is not a string\n"); | |
| 451 fflush(NULL); | |
| 452 } | |
| 453 } | |
| 454 | |
| 455 void *worker_thread_start(void *arg) { | |
| 456 Worker *worker = reinterpret_cast<Worker *>(arg); | |
| 457 | |
| 458 fprintf(stderr, "Sleeping...\n"); fflush(stderr); | |
| 459 sleep(1); | |
| 460 fprintf(stderr, "worker_thread_start: worker %p\n", | |
| 461 reinterpret_cast<void *>(worker)); | |
| 462 fflush(NULL); | |
| 463 worker->RunToCompletion(); | |
| 464 worker = NULL; // RunToCompletion automatically Unrefs | |
| 465 return reinterpret_cast<void *>(NULL); | |
| 466 } | |
| 467 | |
| 468 // This object is the global object representing this plugin library as long | |
| 469 // as it is loaded. | |
| 470 class MyModule : public pp::Module { | |
| 471 public: | |
| 472 MyModule() : pp::Module() {} | |
| 473 virtual ~MyModule() {} | |
| 474 | |
| 475 // Override CreateInstance to create your customized Instance object. | |
| 476 virtual pp::Instance *CreateInstance(PP_Instance instance); | |
| 477 | |
| 478 DISALLOW_COPY_AND_ASSIGN(MyModule); | |
| 479 }; | |
| 480 | |
| 481 pp::Instance *MyModule::CreateInstance(PP_Instance pp_instance) { | |
| 482 MyInstance *instance = new MyInstance(pp_instance); | |
| 483 // spawn worker thread associated with this instance | |
| 484 pthread_t thread; | |
| 485 | |
| 486 fprintf(stderr, "CreateInstance invoked\n"); fflush(NULL); | |
| 487 if (0 != pthread_create(&thread, | |
| 488 reinterpret_cast<pthread_attr_t *>(NULL), | |
| 489 worker_thread_start, | |
| 490 reinterpret_cast<void *>(instance->worker()))) { | |
| 491 // Remove the reference the ownership of which should have been | |
| 492 // passed to the worker thread. | |
| 493 instance->worker()->Unref(); | |
| 494 delete instance; | |
| 495 instance = NULL; | |
| 496 fprintf(stderr, "pthread_create failed\n"); fflush(NULL); | |
| 497 } else { | |
| 498 fprintf(stderr, "CreateInstance: Worker thread started\n"); | |
| 499 fprintf(stderr, "CreateInstance: worker thread object %p\n", | |
| 500 reinterpret_cast<void *>(instance->worker())); | |
| 501 (void) pthread_detach(thread); | |
| 502 } | |
| 503 fprintf(stderr, "CreateInstance: returning instance %p\n", | |
| 504 reinterpret_cast<void *>(instance)); | |
| 505 | |
| 506 return instance; | |
| 507 } | |
| 508 | |
| 509 namespace pp { | |
| 510 | |
| 511 // Factory function for your specialization of the Module object. | |
| 512 Module* CreateModule() { | |
| 513 fprintf(stderr, "CreateModule invoked\n"); fflush(NULL); | |
| 514 return new MyModule(); | |
| 515 } | |
| 516 | |
| 517 } // namespace pp | |
| OLD | NEW |
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Chromium Code Reviews
Issue 418423002:
Pepper: Stop using SRPC for irt_open_resource(). (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src