mirror of https://github.com/minetest/minetest.git
265 lines
6.8 KiB
C++
265 lines
6.8 KiB
C++
/*
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Minetest
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Copyright (C) 2013 sapier, <sapier AT gmx DOT net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <cstdio>
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#include <cstdlib>
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extern "C" {
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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}
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#include "server.h"
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#include "s_async.h"
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#include "log.h"
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#include "filesys.h"
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#include "porting.h"
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#include "common/c_internal.h"
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#include "lua_api/l_base.h"
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/******************************************************************************/
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AsyncEngine::~AsyncEngine()
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{
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// Request all threads to stop
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for (AsyncWorkerThread *workerThread : workerThreads) {
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workerThread->stop();
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}
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// Wake up all threads
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for (auto it : workerThreads) {
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(void)it;
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jobQueueCounter.post();
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}
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// Wait for threads to finish
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for (AsyncWorkerThread *workerThread : workerThreads) {
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workerThread->wait();
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}
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// Force kill all threads
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for (AsyncWorkerThread *workerThread : workerThreads) {
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delete workerThread;
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}
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jobQueueMutex.lock();
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jobQueue.clear();
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jobQueueMutex.unlock();
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workerThreads.clear();
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}
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/******************************************************************************/
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void AsyncEngine::registerStateInitializer(StateInitializer func)
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{
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FATAL_ERROR_IF(initDone, "Initializer may not be registered after init");
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stateInitializers.push_back(func);
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}
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/******************************************************************************/
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void AsyncEngine::initialize(unsigned int numEngines)
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{
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initDone = true;
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for (unsigned int i = 0; i < numEngines; i++) {
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AsyncWorkerThread *toAdd = new AsyncWorkerThread(this,
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std::string("AsyncWorker-") + itos(i));
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workerThreads.push_back(toAdd);
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toAdd->start();
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}
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}
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/******************************************************************************/
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u32 AsyncEngine::queueAsyncJob(std::string &&func, std::string &¶ms,
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const std::string &mod_origin)
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{
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jobQueueMutex.lock();
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u32 jobId = jobIdCounter++;
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jobQueue.emplace_back();
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auto &to_add = jobQueue.back();
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to_add.id = jobId;
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to_add.function = std::move(func);
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to_add.params = std::move(params);
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to_add.mod_origin = mod_origin;
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jobQueueCounter.post();
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jobQueueMutex.unlock();
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return jobId;
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}
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/******************************************************************************/
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bool AsyncEngine::getJob(LuaJobInfo *job)
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{
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jobQueueCounter.wait();
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jobQueueMutex.lock();
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bool retval = false;
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if (!jobQueue.empty()) {
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*job = std::move(jobQueue.front());
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jobQueue.pop_front();
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retval = true;
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}
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jobQueueMutex.unlock();
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return retval;
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}
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/******************************************************************************/
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void AsyncEngine::putJobResult(LuaJobInfo &&result)
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{
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resultQueueMutex.lock();
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resultQueue.emplace_back(std::move(result));
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resultQueueMutex.unlock();
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}
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/******************************************************************************/
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void AsyncEngine::step(lua_State *L)
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{
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int error_handler = PUSH_ERROR_HANDLER(L);
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lua_getglobal(L, "core");
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ScriptApiBase *script = ModApiBase::getScriptApiBase(L);
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MutexAutoLock autolock(resultQueueMutex);
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while (!resultQueue.empty()) {
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LuaJobInfo j = std::move(resultQueue.front());
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resultQueue.pop_front();
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lua_getfield(L, -1, "async_event_handler");
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if (lua_isnil(L, -1))
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FATAL_ERROR("Async event handler does not exist!");
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luaL_checktype(L, -1, LUA_TFUNCTION);
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lua_pushinteger(L, j.id);
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lua_pushlstring(L, j.result.data(), j.result.size());
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// Call handler
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const char *origin = j.mod_origin.empty() ? nullptr : j.mod_origin.c_str();
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script->setOriginDirect(origin);
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int result = lua_pcall(L, 2, 0, error_handler);
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if (result)
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script_error(L, result, origin, "<async>");
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}
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lua_pop(L, 2); // Pop core and error handler
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}
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/******************************************************************************/
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void AsyncEngine::prepareEnvironment(lua_State* L, int top)
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{
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for (StateInitializer &stateInitializer : stateInitializers) {
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stateInitializer(L, top);
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}
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}
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/******************************************************************************/
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AsyncWorkerThread::AsyncWorkerThread(AsyncEngine* jobDispatcher,
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const std::string &name) :
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ScriptApiBase(ScriptingType::Async),
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Thread(name),
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jobDispatcher(jobDispatcher)
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{
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lua_State *L = getStack();
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// Prepare job lua environment
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lua_getglobal(L, "core");
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int top = lua_gettop(L);
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// Push builtin initialization type
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lua_pushstring(L, "async");
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lua_setglobal(L, "INIT");
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jobDispatcher->prepareEnvironment(L, top);
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}
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/******************************************************************************/
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AsyncWorkerThread::~AsyncWorkerThread()
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{
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sanity_check(!isRunning());
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}
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/******************************************************************************/
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void* AsyncWorkerThread::run()
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{
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lua_State *L = getStack();
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try {
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loadMod(getServer()->getBuiltinLuaPath() + DIR_DELIM + "init.lua",
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BUILTIN_MOD_NAME);
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} catch (const ModError &e) {
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errorstream << "Execution of async base environment failed: "
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<< e.what() << std::endl;
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FATAL_ERROR("Execution of async base environment failed");
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}
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int error_handler = PUSH_ERROR_HANDLER(L);
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lua_getglobal(L, "core");
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if (lua_isnil(L, -1)) {
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FATAL_ERROR("Unable to find core within async environment!");
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}
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// Main loop
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LuaJobInfo j;
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while (!stopRequested()) {
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// Wait for job
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if (!jobDispatcher->getJob(&j) || stopRequested())
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continue;
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lua_getfield(L, -1, "job_processor");
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if (lua_isnil(L, -1))
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FATAL_ERROR("Unable to get async job processor!");
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luaL_checktype(L, -1, LUA_TFUNCTION);
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if (luaL_loadbuffer(L, j.function.data(), j.function.size(), "=(async)")) {
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errorstream << "ASYNC WORKER: Unable to deserialize function" << std::endl;
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lua_pushnil(L);
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}
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lua_pushlstring(L, j.params.data(), j.params.size());
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// Call it
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setOriginDirect(j.mod_origin.empty() ? nullptr : j.mod_origin.c_str());
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int result = lua_pcall(L, 2, 1, error_handler);
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if (result) {
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try {
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scriptError(result, "<async>");
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} catch (const ModError &e) {
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errorstream << e.what() << std::endl;
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}
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} else {
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// Fetch result
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size_t length;
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const char *retval = lua_tolstring(L, -1, &length);
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j.result.assign(retval, length);
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}
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lua_pop(L, 1); // Pop retval
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// Put job result
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if (!j.result.empty())
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jobDispatcher->putJobResult(std::move(j));
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}
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lua_pop(L, 2); // Pop core and error handler
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return 0;
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}
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