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More work on thread scheduling and tracebacks

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This commit is contained in:
Josh Yelon
2021-02-20 19:17:20 -05:00
parent 36ff4eacae
commit 5f783e643b
7 changed files with 44 additions and 30 deletions
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1
luprex/core/cpp/sched.hpp
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@@ -11,6 +11,7 @@ private:
int64_t clock_;
int64_t thread_id_;
int64_t place_id_;
int func_args_;
public:
int64_t clock() const { return clock_; }

26
luprex/core/cpp/traceback.cpp
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@@ -5,7 +5,9 @@
// Call this with the error message on top of the stack.
static void traceback_general(lua_State *L, lua_State *L1, int baselevel) {
// The error message is replaced with a traceback.
//
int traceback_coroutine(lua_State *L) {
int top = lua_gettop(L);
// Convert message to a string
@@ -23,22 +25,24 @@ static void traceback_general(lua_State *L, lua_State *L1, int baselevel) {
// Append the traceback.
lua_Debug ar;
int level = baselevel;
int firstpart = 1;
while (lua_getstack(L1, level++, &ar)) {
for (int level = 0; lua_getstack(L, level, &ar); level++) {
if (level > TRACEBACK_LEVELS1 && firstpart) {
/* no more than `LEVELS2' more levels? */
if (!lua_getstack(L1, level + TRACEBACK_LEVELS2, &ar))
if (!lua_getstack(L, level + TRACEBACK_LEVELS2, &ar))
level--; /* keep going */
else {
lua_pushliteral(L, "\n\t..."); /* too many levels */
while (lua_getstack(L1, level + TRACEBACK_LEVELS2, &ar)) /* find last levels */
while (lua_getstack(L, level + TRACEBACK_LEVELS2, &ar)) /* find last levels */
level++;
}
firstpart = 0;
continue;
}
lua_getinfo(L1, "Snl", &ar);
lua_getinfo(L, "Snl", &ar);
if ((level == 0) && (*ar.what == 'C') && (std::string(ar.name) == "__newindex")) {
continue;
}
if ((ar.currentline > 0) || (*ar.namewhat != 0) || (*ar.what != 'C')) {
lua_pushliteral(L, "\n\t");
lua_pushfstring(L, "%s:", ar.short_src);
@@ -64,22 +68,14 @@ static void traceback_general(lua_State *L, lua_State *L1, int baselevel) {
if (1 + lua_gettop(L) - top > 1) {
lua_concat(L, 1 + lua_gettop(L) - top);
}
}
int traceback_handler(lua_State *L) {
traceback_general(L, L, 1);
return 1;
}
void traceback_coroutine(lua_State *L, lua_State *CO) {
lua_xmove(CO, L, 1);
traceback_general(L, CO, 0);
}
int traceback_pcall(lua_State *L, int narg, int nret) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback_handler); /* push traceback function */
lua_pushcfunction(L, traceback_coroutine); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
status = lua_pcall(L, narg, nret, base);
lua_remove(L, base); /* remove traceback function */

6
luprex/core/cpp/traceback.hpp
View File

@@ -15,10 +15,10 @@
// traceback_coroutine
//
// Given a coroutine which contains an error message, pop the error
// message from the coroutine, and push a traceback onto L.
// Given a coroutine which contains an error message, replace
// the error message with a full traceback. Always returns 1.
//
void traceback_coroutine(lua_State *L, lua_State *CO);
int traceback_coroutine(lua_State *L);
// traceback_pcall
//

31
luprex/core/cpp/world.cpp
View File

@@ -118,7 +118,6 @@ Tangible *World::tangible_make(lua_State *L, int64_t id, bool pushdb) {
// Populate the database and metatable with initial stuff.
LS.rawset(database, "inventory", LuaNewTable);
LS.rawset(database, "id", id);
LS.rawset(metatab, "id", id);
LS.rawset(metatab, "threads", LuaNewTable);
// LS.rawset(metatab, "__metatable", LuaNil);
@@ -265,7 +264,6 @@ void World::invoke_plan(int64_t actor_id, int64_t place_id, const std::string &a
run_scheduled_threads(0);
}
void World::run_scheduled_threads(int64_t clk) {
lua_State *L = state();
LuaVar tangibles, place, mt, threads, thread;
@@ -293,23 +291,31 @@ void World::run_scheduled_threads(int64_t clk) {
// Resume the coroutine.
lua_State *CO = LS.ckthread(thread);
int status = lua_resume(CO, 3);
int top = lua_gettop(CO);
int status = lua_resume(CO, (top > 0) ? (top - 1) : 0);
// Three possible outcomes: finished, yielded, or errored.
if (status == LUA_YIELD) {
// When the wait statement yields, it yields the desired timestamp.
std::cerr << "Thread yield top = " << lua_gettop(CO) << std::endl;
// TODO: Insert the thread back into thread_sched_.
LS.rawset(threads, sched.thread_id(), LuaNil);
if ((lua_gettop(CO) != 1) || (!lua_isnumber(CO, 1))) {
std::cerr << "Thread yielded incorrectly. Killing it." << std::endl;
LS.rawset(threads, sched.thread_id(), LuaNil);
} else {
lua_Number delay = lua_tonumber(CO, 1);
lua_settop(CO, 0);
std::cerr << "Thread wait = " << delay << std::endl;
thread_sched_.add(sched.clock() + int64_t(delay), sched.thread_id(), sched.place_id());
std::cerr << "Added to schedule." << std::endl;
}
} else if (status == 0) {
// Successfully ran to completion. Remove from thread table.
std::cerr << "Thread ran to completion." << std::endl;
LS.rawset(threads, sched.thread_id(), LuaNil);
} else {
// Transfer the error message from CO to L, and add a traceback.
// Generated an error. Add a traceback, print, and kill the coroutine.
traceback_coroutine(CO);
std::cerr << lua_tostring(CO, -1);
LS.rawset(threads, sched.thread_id(), LuaNil);
traceback_coroutine(L, CO);
std::cerr << lua_tostring(L, -1);
}
}
LS.result();
@@ -330,3 +336,10 @@ LuaDefine(tangible_make, "c") {
World::fetch(L)->tangible_make(L, 0, true);
return 1;
}
LuaDefine(world_wait, "f") {
if (lua_type(L, -1) != LUA_TNUMBER) {
luaL_error(L, "Argument to wait must be a number.");
}
return lua_yield(L, 1);
}

2
luprex/core/cpp/world.hpp
View File

@@ -61,7 +61,7 @@ public:
PlaneMap plane_map_;
std::unordered_map<int64_t, Tangible> tangibles_;
// Thread schedule: should include every thread, except
// Thread schedule: must include every thread, except
// for the one currently-executing thread.
//
Schedule thread_sched_;

4
luprex/core/lua/player.lua
View File

@@ -17,8 +17,12 @@ end
function player.action.east(actor, place, gui)
print("Moving east")
t = nil
t[3] = 4
end
function player.action.west(actor, place, gui)
print("Moving west")
wait(0)
print("Moving west again")
end