Remove WorkThread::Result.

WorkThread::StartThread is now a more typical main function.

src/command_line.cc

@@ -187,9 +187,9 @@ void RunQueryDbThread(const std::string& bin_name,
   SetCurrentThreadName("querydb");
   while (true) {
     bool did_work = QueryDbMainLoop(
-        config, &db, waiter, &project, &file_consumer_shared,
-        &import_manager, &timestamp_manager, &semantic_cache, &working_files,
-        &clang_complete, &include_complete, global_code_complete_cache.get(),
+        config, &db, waiter, &project, &file_consumer_shared, &import_manager,
+        &timestamp_manager, &semantic_cache, &working_files, &clang_complete,
+        &include_complete, global_code_complete_cache.get(),
         non_global_code_complete_cache.get(), signature_cache.get());
 
     // Cleanup and free any unused memory.
@@ -234,13 +234,14 @@ void LaunchStdinLoop(Config* config,
 
   WorkThread::StartThread("stdin", [request_times]() {
     auto* queue = QueueManager::instance();
+    while (true) {
       std::unique_ptr<BaseIpcMessage> message =
           MessageRegistry::instance()->ReadMessageFromStdin(
               g_log_stdin_stdout_to_stderr);
 
       // Message parsing can fail if we don't recognize the method.
       if (!message)
-      return WorkThread::Result::MoreWork;
+        continue;
 
       // Cache |method_id| so we can access it after moving |message|.
       IpcId method_id = message->method_id;
@@ -292,8 +293,7 @@ void LaunchStdinLoop(Config* config,
         }
 
         default: {
-        LOG_S(ERROR) << "Unhandled IPC message "
-                     << IpcIdToString(method_id);
+          LOG_S(ERROR) << "Unhandled IPC message " << IpcIdToString(method_id);
           exit(1);
         }
       }
@@ -301,9 +301,8 @@ void LaunchStdinLoop(Config* config,
       // If the message was to exit then querydb will take care of the actual
       // exit. Stop reading from stdin since it might be detached.
       if (method_id == IpcId::Exit)
-      return WorkThread::Result::ExitThread;
-
-    return WorkThread::Result::MoreWork;
+        break;
+    }
   });
 }
 
@@ -312,11 +311,11 @@ void LaunchStdoutThread(std::unordered_map<IpcId, Timer>* request_times,
   WorkThread::StartThread("stdout", [=]() {
     auto* queue = QueueManager::instance();
 
+    while (true) {
       std::vector<Stdout_Request> messages = queue->for_stdout.DequeueAll();
       if (messages.empty()) {
         waiter->Wait({&queue->for_stdout});
-      return queue->HasWork() ? WorkThread::Result::MoreWork
-                              : WorkThread::Result::NoWork;
+        continue;
       }
 
       for (auto& message : messages) {
@@ -338,8 +337,7 @@ void LaunchStdoutThread(std::unordered_map<IpcId, Timer>* request_times,
         std::cout << message.content;
         std::cout.flush();
       }
-
-    return WorkThread::Result::MoreWork;
+    }
   });
 }
 

src/entry_points.h

@@ -20,7 +20,7 @@ bool QueryDb_ImportMain(Config* config,
                         SemanticHighlightSymbolCache* semantic_cache,
                         WorkingFiles* working_files);
 
-WorkThread::Result IndexMain(Config* config,
+void IndexMain(Config* config,
                FileConsumer::SharedState* file_consumer_shared,
                TimestampManager* timestamp_manager,
                ImportManager* import_manager,

src/import_pipeline.cc

@@ -434,7 +434,7 @@ bool IndexMergeIndexUpdates() {
   }
 }
 
-WorkThread::Result IndexMain(Config* config,
+void IndexMain(Config* config,
                FileConsumer::SharedState* file_consumer_shared,
                TimestampManager* timestamp_manager,
                ImportManager* import_manager,
@@ -442,13 +442,14 @@ WorkThread::Result IndexMain(Config* config,
                Project* project,
                WorkingFiles* working_files,
                MultiQueueWaiter* waiter) {
+  // Build one index per-indexer, as building the index acquires a global lock.
+  ClangIndex index;
+
+  while (true) {
     status->num_active_threads++;
 
     EmitProgress(config);
 
-  // Build one index per-indexer, as building the index acquires a global lock.
-  ClangIndex index;
-
     // TODO: process all off IndexMain_DoIndex before calling
     // IndexMain_DoCreateIndexUpdate for better icache behavior. We need to have
     // some threads spinning on both though otherwise memory usage will get bad.
@@ -481,9 +482,7 @@ WorkThread::Result IndexMain(Config* config,
       waiter->Wait({&queue->index_request, &queue->on_id_mapped,
                     &queue->load_previous_index, &queue->on_indexed});
     }
-
-  return queue->HasWork() ? WorkThread::Result::MoreWork
-                          : WorkThread::Result::NoWork;
+  }
 }
 
 bool QueryDb_ImportMain(Config* config,

src/include_complete.cc

@@ -136,8 +136,6 @@ void IncludeComplete::Rescan() {
 
     timer.ResetAndPrint("[perf] Scanning for includes");
     is_scanning = false;
-
-    return WorkThread::Result::ExitThread;
   });
 }
 

src/messages/cquery_wait.cc

@@ -4,17 +4,14 @@
 #include <loguru.hpp>
 
 namespace {
-struct Ipc_CqueryWait
-    : public IpcMessage<Ipc_CqueryWait> {
+struct Ipc_CqueryWait : public IpcMessage<Ipc_CqueryWait> {
   static constexpr IpcId kIpcId = IpcId::CqueryWait;
 };
 MAKE_REFLECT_EMPTY_STRUCT(Ipc_CqueryWait);
 REGISTER_IPC_MESSAGE(Ipc_CqueryWait);
 
 struct CqueryWaitHandler : MessageHandler {
-  IpcId GetId() const override {
-    return IpcId::CqueryWait;
-  }
+  IpcId GetId() const override { return IpcId::CqueryWait; }
   void Run(std::unique_ptr<BaseIpcMessage> request) override {
     // TODO: use status message system here, then run querydb as normal? Maybe
     // this cannot be a normal message, ie, it needs to be re-entrant.

src/messages/initialize.cc

@@ -173,7 +173,7 @@ struct InitializeHandler : BaseMessageHandler<Ipc_InitializeRequest> {
       LOG_S(INFO) << "Starting " << config->indexerCount << " indexers";
       for (int i = 0; i < config->indexerCount; ++i) {
         WorkThread::StartThread("indexer" + std::to_string(i), [=]() {
-          return IndexMain(config, file_consumer_shared, timestamp_manager,
+          IndexMain(config, file_consumer_shared, timestamp_manager,
                     import_manager, import_pipeline_status, project,
                     working_files, waiter);
         });

src/work_thread.cc

@@ -4,15 +4,9 @@
 
 // static
 void WorkThread::StartThread(const std::string& thread_name,
-                             const std::function<Result()>& entry_point) {
+                             std::function<void()> entry_point) {
   new std::thread([thread_name, entry_point]() {
     SetCurrentThreadName(thread_name);
-
-    // Main loop.
-    while (true) {
-      Result result = entry_point();
-      if (result == Result::ExitThread)
-        break;
-    }
+    entry_point();
   });
 }

src/work_thread.h

@@ -9,13 +9,10 @@
 // Helper methods for starting threads that do some work. Enables test code to
 // wait for all work to complete.
 struct WorkThread {
-  // FIXME: remove result, have entry_point run a while(true) loop.
-  enum class Result { MoreWork, NoWork, ExitThread };
-
   // Launch a new thread. |entry_point| will be called continously. It should
   // return true if it there is still known work to be done.
   static void StartThread(const std::string& thread_name,
-                          const std::function<Result()>& entry_point);
+                          std::function<void()> entry_point);
 
   // Static-only class.
   WorkThread() = delete;