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#include "thread.h"
#include "lua5.4/lauxlib.h"
#include "lua5.4/lua.h"
#include "stdint.h"
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include "types/str.h"
#include "util.h"
#include "types/larray.h"
struct thread_info {
str* function;
lua_State* L;
int return_count, done;
pthread_t tid;
pthread_mutex_t lock;
};
#include "io.h"
//give the current thread priority to locking thread_lock_lock (fixes race conds)
pthread_mutex_t thread_priority_lock = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t thread_lock_lock = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;
larray_t* thread_locks = NULL;
void lib_thread_clean(){
if(thread_locks == NULL) return;
for(int i = 0; i != thread_locks->size; i++){
if(thread_locks->arr[i].used){
//pthread_mutex_destroy(thread_locks->arr[i].value);
free(thread_locks->arr[i].value);
}
}
larray_clear(thread_locks);
}
int l_tlock(lua_State* L){
int idx = luaL_checkinteger(L, 1);
pthread_mutex_lock(&thread_lock_lock);
//pthread_mutex_lock(&thread_priority_lock);
//pthread_mutex_unlock(&thread_priority_lock);
pthread_mutex_t mutex;
if(thread_locks == NULL) thread_locks = larray_init();
int i = 0;
if((i = larray_geti(thread_locks, idx)) == -1){
pthread_mutex_init(&mutex, NULL);
pthread_mutex_lock(&mutex);
pthread_mutex_t* mp = malloc(sizeof * mp);
*mp = mutex;
int id = larray_set(&thread_locks, idx, (void*)mp);
} else {
pthread_mutex_t *m = (pthread_mutex_t*)thread_locks->arr[i].value;
pthread_mutex_lock(&thread_priority_lock);
pthread_mutex_unlock(&thread_lock_lock);
pthread_mutex_lock(m);
pthread_mutex_lock(&thread_lock_lock);
pthread_mutex_unlock(&thread_priority_lock);
thread_locks->arr[i].value = (void*)m;
}
pthread_mutex_unlock(&thread_lock_lock);
return 0;
}
int l_tunlock(lua_State* L){
int idx = luaL_checkinteger(L, 1);
pthread_mutex_lock(&thread_lock_lock);
int i = 0;
if(thread_locks != NULL && (i = larray_geti(thread_locks, idx)) != -1){
pthread_mutex_t *m = (pthread_mutex_t*)thread_locks->arr[i].value;
pthread_mutex_unlock(m);
thread_locks->arr[i].value = (void*)m;
}
pthread_mutex_unlock(&thread_lock_lock);
return 0;
}
int l_res(lua_State* L){
int return_count = lua_gettop(L) - 1;
lua_pushstring(L, "_");
lua_gettable(L, 1);
struct thread_info* info = lua_touserdata(L, -1);
info->return_count = return_count;
for(int i = info->return_count - 1; i != -1; i--){
int ot = lua_gettop(L);
lua_pushvalue(L, 2 + i);
i_dcopy(L, info->L, NULL);
lua_settop(L, ot);
}
pthread_mutex_unlock(&info->lock);
pthread_exit(NULL);
p_error("thread did not exit");
return 1;
}
void* handle_thread(void* _args){
struct thread_info* args = (struct thread_info*)_args;
lua_State* L = args->L;
lua_gc(L, LUA_GCSTOP);
lua_newtable(L);
int res_idx = lua_gettop(L);
luaI_tsetlud(L, res_idx, "_", args);
lua_newtable(L);
int meta_idx = lua_gettop(L);
luaI_tsetcf(L, meta_idx, "__call", l_res);
lua_pushvalue(L, meta_idx);
lua_setmetatable(L, res_idx);
luaL_loadbuffer(L, args->function->c, args->function->len, "thread");
str_free(args->function);
lua_pushvalue(L, res_idx);
lua_call(L, 1, 0);
pthread_mutex_unlock(&args->lock);
return NULL;
}
int l_await(lua_State* L){
lua_pushstring(L, "_");
lua_gettable(L, 1);
struct thread_info* info = lua_touserdata(L, -1);
if(info->L == NULL) p_fatal("thread has already been cleaned");
if(!info->done) pthread_mutex_lock(&info->lock);
info->done = 1;
for(int i = 0; i != info->return_count; i++){
int ot = lua_gettop(info->L);
lua_pushvalue(info->L, ot - info->return_count + i);
i_dcopy(info->L, L, NULL);
lua_settop(info->L, ot);
}
return info->return_count;
}
int l_clean(lua_State* L){
lua_pushstring(L, "_");
lua_gettable(L, 1);
struct thread_info* info = lua_touserdata(L, -1);
if(info != NULL && info->L != NULL){
lua_gc(info->L, LUA_GCRESTART);
lua_gc(info->L, LUA_GCCOLLECT);
lua_close(info->L);
info->L = NULL;
pthread_mutex_destroy(&info->lock);
free(info);
luaI_tsetlud(L, 1, "_", NULL);
}
return 0;
}
int l_async(lua_State* oL){
lua_State* L = luaL_newstate();
luaL_openlibs(L);
lua_getglobal(oL, "_G");
i_dcopy(oL, L, NULL);
lua_set_global_table(L);
struct thread_info* args = calloc(1, sizeof * args);
args->L = L;
args->lock = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock(&args->lock);
args->return_count = 0;
args->function = str_init("");
lua_pushvalue(oL, 1);
lua_dump(oL, writer, (void*)args->function, 0);
pthread_create(&args->tid, NULL, handle_thread, (void*)args);
pthread_detach(args->tid);
lua_newtable(oL);
int res_idx = lua_gettop(oL);
luaI_tsetcf(oL, res_idx, "await", l_await);
luaI_tsetcf(oL, res_idx, "clean", l_clean);
luaI_tsetlud(oL, res_idx, "_", args);
lua_newtable(oL);
int meta_idx = lua_gettop(oL);
luaI_tsetcf(oL, meta_idx, "__gc", l_clean);
lua_pushvalue(oL, meta_idx);
lua_setmetatable(oL, res_idx);
lua_pushvalue(oL, res_idx);
return 1;
}
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