minetest/src/script/cpp_api/s_async.cpp

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/*
Minetest
Copyright (C) 2013 sapier, <sapier AT gmx DOT net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
extern "C" {
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
}
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#include "server.h"
#include "s_async.h"
#include "log.h"
#include "filesys.h"
#include "porting.h"
#include "common/c_internal.h"
/******************************************************************************/
AsyncEngine::AsyncEngine() :
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initDone(false),
jobIdCounter(0)
{
}
/******************************************************************************/
AsyncEngine::~AsyncEngine()
{
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// Request all threads to stop
for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
it != workerThreads.end(); it++) {
(*it)->Stop();
}
// Wake up all threads
for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
it != workerThreads.end(); it++) {
jobQueueCounter.Post();
}
// Wait for threads to finish
for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
it != workerThreads.end(); it++) {
(*it)->Wait();
}
// Force kill all threads
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for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
it != workerThreads.end(); it++) {
(*it)->Kill();
delete *it;
}
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jobQueueMutex.Lock();
jobQueue.clear();
jobQueueMutex.Unlock();
workerThreads.clear();
}
/******************************************************************************/
bool AsyncEngine::registerFunction(const char* name, lua_CFunction func)
{
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if (initDone) {
return false;
}
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functionList[name] = func;
return true;
}
/******************************************************************************/
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void AsyncEngine::initialize(unsigned int numEngines)
{
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initDone = true;
for (unsigned int i = 0; i < numEngines; i++) {
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AsyncWorkerThread *toAdd = new AsyncWorkerThread(this, i);
workerThreads.push_back(toAdd);
toAdd->Start();
}
}
/******************************************************************************/
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unsigned int AsyncEngine::queueAsyncJob(std::string func, std::string params)
{
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jobQueueMutex.Lock();
LuaJobInfo toAdd;
toAdd.id = jobIdCounter++;
toAdd.serializedFunction = func;
toAdd.serializedParams = params;
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jobQueue.push_back(toAdd);
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jobQueueCounter.Post();
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jobQueueMutex.Unlock();
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return toAdd.id;
}
/******************************************************************************/
LuaJobInfo AsyncEngine::getJob()
{
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jobQueueCounter.Wait();
jobQueueMutex.Lock();
LuaJobInfo retval;
retval.valid = false;
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if (!jobQueue.empty()) {
retval = jobQueue.front();
jobQueue.pop_front();
retval.valid = true;
}
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jobQueueMutex.Unlock();
return retval;
}
/******************************************************************************/
void AsyncEngine::putJobResult(LuaJobInfo result)
{
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resultQueueMutex.Lock();
resultQueue.push_back(result);
resultQueueMutex.Unlock();
}
/******************************************************************************/
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void AsyncEngine::step(lua_State *L, int errorhandler)
{
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lua_getglobal(L, "core");
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resultQueueMutex.Lock();
while (!resultQueue.empty()) {
LuaJobInfo jobDone = resultQueue.front();
resultQueue.pop_front();
lua_getfield(L, -1, "async_event_handler");
if (lua_isnil(L, -1)) {
FATAL_ERROR("Async event handler does not exist!");
}
luaL_checktype(L, -1, LUA_TFUNCTION);
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lua_pushinteger(L, jobDone.id);
lua_pushlstring(L, jobDone.serializedResult.data(),
jobDone.serializedResult.size());
if (lua_pcall(L, 2, 0, errorhandler)) {
script_error(L);
}
}
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resultQueueMutex.Unlock();
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lua_pop(L, 1); // Pop core
}
/******************************************************************************/
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void AsyncEngine::pushFinishedJobs(lua_State* L) {
// Result Table
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resultQueueMutex.Lock();
unsigned int index = 1;
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lua_createtable(L, resultQueue.size(), 0);
int top = lua_gettop(L);
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while (!resultQueue.empty()) {
LuaJobInfo jobDone = resultQueue.front();
resultQueue.pop_front();
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lua_createtable(L, 0, 2); // Pre-allocate space for two map fields
int top_lvl2 = lua_gettop(L);
lua_pushstring(L, "jobid");
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lua_pushnumber(L, jobDone.id);
lua_settable(L, top_lvl2);
lua_pushstring(L, "retval");
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lua_pushlstring(L, jobDone.serializedResult.data(),
jobDone.serializedResult.size());
lua_settable(L, top_lvl2);
lua_rawseti(L, top, index++);
}
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resultQueueMutex.Unlock();
}
/******************************************************************************/
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void AsyncEngine::prepareEnvironment(lua_State* L, int top)
{
for (std::map<std::string, lua_CFunction>::iterator it = functionList.begin();
it != functionList.end(); it++) {
lua_pushstring(L, it->first.c_str());
lua_pushcfunction(L, it->second);
lua_settable(L, top);
}
}
/******************************************************************************/
AsyncWorkerThread::AsyncWorkerThread(AsyncEngine* jobDispatcher,
unsigned int threadNum) :
ScriptApiBase(),
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jobDispatcher(jobDispatcher),
threadnum(threadNum)
{
lua_State *L = getStack();
// Prepare job lua environment
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lua_getglobal(L, "core");
int top = lua_gettop(L);
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// Push builtin initialization type
lua_pushstring(L, "async");
lua_setglobal(L, "INIT");
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jobDispatcher->prepareEnvironment(L, top);
}
/******************************************************************************/
AsyncWorkerThread::~AsyncWorkerThread()
{
sanity_check(IsRunning() == false);
}
/******************************************************************************/
void* AsyncWorkerThread::Thread()
{
ThreadStarted();
// Register thread for error logging
char number[21];
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snprintf(number, sizeof(number), "%u", threadnum);
log_register_thread(std::string("AsyncWorkerThread_") + number);
porting::setThreadName((std::string("AsyncWorkTh_") + number).c_str());
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lua_State *L = getStack();
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std::string script = getServer()->getBuiltinLuaPath() + DIR_DELIM + "init.lua";
if (!loadScript(script)) {
errorstream
<< "AsyncWorkderThread execution of async base environment failed!"
<< std::endl;
abort();
}
lua_getglobal(L, "core");
if (lua_isnil(L, -1)) {
errorstream << "Unable to find core within async environment!";
abort();
}
// Main loop
while (!StopRequested()) {
// Wait for job
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LuaJobInfo toProcess = jobDispatcher->getJob();
if (toProcess.valid == false || StopRequested()) {
continue;
}
lua_getfield(L, -1, "job_processor");
if (lua_isnil(L, -1)) {
errorstream << "Unable to get async job processor!" << std::endl;
abort();
}
luaL_checktype(L, -1, LUA_TFUNCTION);
// Call it
lua_pushlstring(L,
toProcess.serializedFunction.data(),
toProcess.serializedFunction.size());
lua_pushlstring(L,
toProcess.serializedParams.data(),
toProcess.serializedParams.size());
if (lua_pcall(L, 2, 1, m_errorhandler)) {
scriptError();
toProcess.serializedResult = "";
} else {
// Fetch result
size_t length;
const char *retval = lua_tolstring(L, -1, &length);
toProcess.serializedResult = std::string(retval, length);
}
lua_pop(L, 1); // Pop retval
// Put job result
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jobDispatcher->putJobResult(toProcess);
}
lua_pop(L, 1); // Pop core
log_deregister_thread();
return 0;
}