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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.
*/
extern "C" {
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
int luaopen_marshal(lua_State *L);
}
#include <stdio.h>
#include "l_async_events.h"
#include "log.h"
#include "filesys.h"
#include "porting.h"
#include "common/c_internal.h"
/******************************************************************************/
AsyncEngine::AsyncEngine() :
m_initDone(false),
m_JobIdCounter(0)
{
}
/******************************************************************************/
AsyncEngine::~AsyncEngine()
{
/** request all threads to stop **/
for (std::vector<AsyncWorkerThread*>::iterator i= m_WorkerThreads.begin();
i != m_WorkerThreads.end();i++) {
(*i)->Stop();
}
/** wakeup all threads **/
for (std::vector<AsyncWorkerThread*>::iterator i= m_WorkerThreads.begin();
i != m_WorkerThreads.end();i++) {
m_JobQueueCounter.Post();
}
/** wait for threads to finish **/
for (std::vector<AsyncWorkerThread*>::iterator i= m_WorkerThreads.begin();
i != m_WorkerThreads.end();i++) {
(*i)->Wait();
}
/** force kill all threads **/
for (std::vector<AsyncWorkerThread*>::iterator i= m_WorkerThreads.begin();
i != m_WorkerThreads.end();i++) {
(*i)->Kill();
delete *i;
}
m_JobQueueMutex.Lock();
m_JobQueue.clear();
m_JobQueueMutex.Unlock();
m_WorkerThreads.clear();
}
/******************************************************************************/
bool AsyncEngine::registerFunction(const char* name, lua_CFunction fct) {
if (m_initDone) return false;
m_FunctionList[name] = fct;
return true;
}
/******************************************************************************/
void AsyncEngine::Initialize(unsigned int numengines) {
m_initDone = true;
for (unsigned int i=0; i < numengines; i ++) {
AsyncWorkerThread* toadd = new AsyncWorkerThread(this,i);
m_WorkerThreads.push_back(toadd);
toadd->Start();
}
}
/******************************************************************************/
unsigned int AsyncEngine::doAsyncJob(std::string fct, std::string params) {
m_JobQueueMutex.Lock();
LuaJobInfo toadd;
toadd.JobId = m_JobIdCounter++;
toadd.serializedFunction = fct;
toadd.serializedParams = params;
m_JobQueue.push_back(toadd);
m_JobQueueCounter.Post();
m_JobQueueMutex.Unlock();
return toadd.JobId;
}
/******************************************************************************/
LuaJobInfo AsyncEngine::getJob() {
m_JobQueueCounter.Wait();
m_JobQueueMutex.Lock();
LuaJobInfo retval;
retval.valid = false;
if (m_JobQueue.size() != 0) {
retval = m_JobQueue.front();
retval.valid = true;
m_JobQueue.erase((m_JobQueue.begin()));
}
m_JobQueueMutex.Unlock();
return retval;
}
/******************************************************************************/
void AsyncEngine::putJobResult(LuaJobInfo result) {
m_ResultQueueMutex.Lock();
m_ResultQueue.push_back(result);
m_ResultQueueMutex.Unlock();
}
/******************************************************************************/
void AsyncEngine::Step(lua_State *L) {
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L);
lua_getglobal(L, "engine");
m_ResultQueueMutex.Lock();
while(!m_ResultQueue.empty()) {
LuaJobInfo jobdone = m_ResultQueue.front();
m_ResultQueue.erase(m_ResultQueue.begin());
lua_getfield(L, -1, "async_event_handler");
if(lua_isnil(L, -1))
assert("Someone managed to destroy a async callback in engine!" == 0);
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushinteger(L, jobdone.JobId);
lua_pushlstring(L, jobdone.serializedResult.c_str(),
jobdone.serializedResult.length());
if(lua_pcall(L, 2, 0, errorhandler)) {
script_error(L);
}
}
m_ResultQueueMutex.Unlock();
lua_pop(L, 2); // Pop engine and error handler
}
/******************************************************************************/
void AsyncEngine::PushFinishedJobs(lua_State* L) {
//Result Table
m_ResultQueueMutex.Lock();
unsigned int index=1;
lua_newtable(L);
int top = lua_gettop(L);
while(!m_ResultQueue.empty()) {
LuaJobInfo jobdone = m_ResultQueue.front();
m_ResultQueue.erase(m_ResultQueue.begin());
lua_pushnumber(L,index);
lua_newtable(L);
int top_lvl2 = lua_gettop(L);
lua_pushstring(L,"jobid");
lua_pushnumber(L,jobdone.JobId);
lua_settable(L, top_lvl2);
lua_pushstring(L,"retval");
lua_pushstring(L, jobdone.serializedResult.c_str());
lua_settable(L, top_lvl2);
lua_settable(L, top);
index++;
}
m_ResultQueueMutex.Unlock();
}
/******************************************************************************/
void AsyncEngine::PrepareEnvironment(lua_State* L, int top) {
for(std::map<std::string,lua_CFunction>::iterator i = m_FunctionList.begin();
i != m_FunctionList.end(); i++) {
lua_pushstring(L,i->first.c_str());
lua_pushcfunction(L,i->second);
lua_settable(L, top);
}
}
/******************************************************************************/
int async_worker_ErrorHandler(lua_State *L) {
lua_getfield(L, LUA_GLOBALSINDEX, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1);
lua_pushinteger(L, 2);
lua_call(L, 2, 1);
return 1;
}
/******************************************************************************/
AsyncWorkerThread::AsyncWorkerThread(AsyncEngine* jobdispatcher,
unsigned int numthreadnumber) :
m_JobDispatcher(jobdispatcher),
m_luaerrorhandler(-1),
m_threadnum(numthreadnumber)
{
// create luastack
m_LuaStack = luaL_newstate();
// load basic lua modules
luaL_openlibs(m_LuaStack);
// load serialization functions
luaopen_marshal(m_LuaStack);
}
/******************************************************************************/
AsyncWorkerThread::~AsyncWorkerThread() {
assert(IsRunning() == false);
lua_close(m_LuaStack);
}
/******************************************************************************/
void* AsyncWorkerThread::worker_thread_main() {
//register thread for error logging
char number[21];
snprintf(number,sizeof(number),"%d",m_threadnum);
log_register_thread(std::string("AsyncWorkerThread_") + number);
porting::setThreadName(
std::string(std::string("AsyncWorkTh_") + number).c_str());
/** prepare job lua environment **/
lua_newtable(m_LuaStack);
lua_setglobal(m_LuaStack, "engine");
lua_getglobal(m_LuaStack, "engine");
int top = lua_gettop(m_LuaStack);
lua_pushstring(m_LuaStack, DIR_DELIM);
lua_setglobal(m_LuaStack, "DIR_DELIM");
lua_pushstring(m_LuaStack,
std::string(porting::path_share + DIR_DELIM + "builtin").c_str());
lua_setglobal(m_LuaStack, "SCRIPTDIR");
m_JobDispatcher->PrepareEnvironment(m_LuaStack,top);
std::string asyncscript =
porting::path_share + DIR_DELIM + "builtin"
+ DIR_DELIM + "async_env.lua";
lua_pushcfunction(m_LuaStack, async_worker_ErrorHandler);
m_luaerrorhandler = lua_gettop(m_LuaStack);
if(!runScript(asyncscript)) {
infostream
<< "AsyncWorkderThread::worker_thread_main execution of async base environment failed!"
<< std::endl;
assert("no future with broken builtin async environment scripts" == 0);
}
/** main loop **/
while(!StopRequested()) {
//wait for job
LuaJobInfo toprocess = m_JobDispatcher->getJob();
if (toprocess.valid == false) { continue; }
if (StopRequested()) { continue; }
//first push error handler
lua_pushcfunction(m_LuaStack, script_error_handler);
int errorhandler = lua_gettop(m_LuaStack);
lua_getglobal(m_LuaStack, "engine");
if(lua_isnil(m_LuaStack, -1))
assert("unable to find engine within async environment" == 0);
lua_getfield(m_LuaStack, -1, "job_processor");
if(lua_isnil(m_LuaStack, -1))
assert("Someone managed to destroy a async worker engine!" == 0);
luaL_checktype(m_LuaStack, -1, LUA_TFUNCTION);
//call it
lua_pushlstring(m_LuaStack,
toprocess.serializedFunction.c_str(),
toprocess.serializedFunction.length());
lua_pushlstring(m_LuaStack,
toprocess.serializedParams.c_str(),
toprocess.serializedParams.length());
if (StopRequested()) { continue; }
if(lua_pcall(m_LuaStack, 2, 2, errorhandler)) {
script_error(m_LuaStack);
toprocess.serializedResult = "ERROR";
} else {
//fetch result
const char *retval = lua_tostring(m_LuaStack, -2);
unsigned int lenght = lua_tointeger(m_LuaStack,-1);
toprocess.serializedResult = std::string(retval,lenght);
}
if (StopRequested()) { continue; }
//put job result
m_JobDispatcher->putJobResult(toprocess);
}
log_deregister_thread();
return 0;
}
/******************************************************************************/
bool AsyncWorkerThread::runScript(std::string script) {
int ret = luaL_loadfile(m_LuaStack, script.c_str()) ||
lua_pcall(m_LuaStack, 0, 0, m_luaerrorhandler);
if(ret){
errorstream<<"==== ERROR FROM LUA WHILE INITIALIZING ASYNC ENVIRONMENT ====="<<std::endl;
errorstream<<"Failed to load and run script from "<<std::endl;
errorstream<<script<<":"<<std::endl;
errorstream<<std::endl;
errorstream<<lua_tostring(m_LuaStack, -1)<<std::endl;
errorstream<<std::endl;
errorstream<<"=================== END OF ERROR FROM LUA ===================="<<std::endl;
lua_pop(m_LuaStack, 1); // Pop error message from stack
lua_pop(m_LuaStack, 1); // Pop the error handler from stack
return false;
}
return true;
}
/******************************************************************************/
void* AsyncWorkerThread::worker_thread_wrapper(void* thread) {
return ((AsyncWorkerThread*) thread)->worker_thread_main();
}
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