/*
* Arguments: ..., function, [arguments (any) ...]
* Returns: [results (any) ...]
*/
static int
levq_sync_call (lua_State *L, struct event_queue *evq,
struct evq_sync_op *op,
const int is_sched_add, const int fn_idx)
{
op->L = L;
op->fn_idx = fn_idx;
op->status = 0;
op->is_sched_add = is_sched_add;
op->next = evq->sync_op;
evq->sync_op = op;
evq_signal(evq, EVQ_SIGEVQ);
if (is_sched_add) {
lua_pushlightuserdata(L, op); /* sync_op_ludata */
return 1;
} else {
struct sys_thread *td = sys_thread_get();
const int old_top = fn_idx - 1;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
op->td = td;
sys_thread_suspend(td, TIMEOUT_INFINITE); /* wait result */
if (op->status) lua_error(L);
return lua_gettop(L) - old_top;
}
}
/*
* Arguments: function, [arguments (any) ...]
* Returns: [thread_udata]
*/
static int
thread_run (lua_State *L)
{
struct sys_thread *td, *vmtd = sys_thread_get();
if (!vmtd) luaL_argerror(L, 0, "Threading not initialized");
luaL_checktype(L, 1, LUA_TFUNCTION);
td = sys_thread_new(L, vmtd, NULL, 1);
if (!td) goto err;
lua_insert(L, 1); /* thread_udata */
/* function and arguments */
{
const int n = lua_gettop(L) - 1;
luaL_checkstack(td->L, n, NULL);
lua_xmove(L, td->L, n);
}
if (!sys_thread_create(td, 0)) {
return 1;
}
sys_thread_del(td);
err:
return sys_seterror(L, 0);
}
/*
* Arguments: [stack_size (number)]
* Returns: [boolean]
*/
static int
thread_init (lua_State *L)
{
const size_t stack_size = (size_t) luaL_optinteger(L, 1, THREAD_STACK_SIZE);
struct sys_thread *td;
/* TLS Index */
if (g_TLSIndex == INVALID_TLS_INDEX) {
#ifndef _WIN32
const int res = pthread_key_create(&g_TLSIndex, NULL);
if (res) {
errno = res;
goto err;
}
#else
if ((g_TLSIndex = TlsAlloc()) == INVALID_TLS_INDEX)
goto err;
#endif
}
/* VM Mutex */
td = sys_thread_get();
if (!td) {
td = thread_newvm(L, NULL, 0);
if (!td) goto err;
sys_thread_set(td);
sys_vm2_enter(td);
}
td->vmtd->stack_size = stack_size;
lua_pushboolean(L, 1);
return 1;
err:
return sys_seterror(L, 0);
}
/*
* Arguments: dpool_udata, data_items (any) ...
*/
static int
dpool_put (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
struct data_pool *dp = checkudata(L, 1, DPOOL_TYPENAME);
int nput = lua_gettop(L) - 1;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
if (!nput) luaL_argerror(L, 2, "data expected");
lua_getfenv(L, 1); /* storage */
lua_insert(L, 1);
if (dp->n >= dp->max) {
if (dp->flags & DPOOL_PUTONFULL) {
lua_rawgetp(L, 1, (void *) DPOOL_PUTONFULL);
lua_insert(L, 2);
lua_call(L, 1 + nput, LUA_MULTRET);
nput = lua_gettop(L) - 1;
if (!nput) return 0;
} else {
do {
const int res = thread_event_wait(&dp->tev, td,
TIMEOUT_INFINITE);
sys_thread_check(td);
if (res) return sys_seterror(L, 0);
} while (dp->n >= dp->max);
}
}
/* Try directly move data between threads */
if (dp->nwaits && !dp->td) {
dp->td = td;
dp->nput = nput;
thread_event_signal(&dp->tev);
sys_thread_switch(0);
dp->td = NULL;
if (!dp->nput) return 0; /* moved to thread */
dp->nput = 0;
}
/* Keep data in the storage */
{
int top = dp->top;
lua_pushinteger(L, nput);
do {
lua_rawseti(L, 1, ++top);
} while (nput--);
dp->top = top;
if (!dp->n++) {
thread_event_signal(&dp->tev);
}
}
return 0;
}
int
sys_eintr (void)
{
#ifndef _WIN32
if (SYS_ERRNO == EINTR) {
struct sys_thread *td = sys_thread_get();
return !(td && td->flags);
}
#endif
return 0;
}
/*
* Returns: thread_udata, is_main (boolean)
*/
static int
thread_self (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
if (!td) luaL_argerror(L, 0, "Threading not initialized");
lua_rawgetp(L, LUA_REGISTRYINDEX, THREAD_KEY_ADDRESS);
lua_rawgetp(L, -1, td);
lua_pushboolean(L, thread_isvm(td));
return 2;
}
static int
thread_switch_wrap (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
(void) L;
if (td) {
sys_thread_switch(td);
sys_thread_check(td, L);
}
return 0;
}
int
sys_thread_suspend (struct sys_thread *td, const msec_t timeout)
{
int res;
lua_assert(td && td == sys_thread_get());
td->suspended = 1;
do {
res = thread_cond_wait_vm(&td->cond, td, timeout);
} while (td->suspended && !res);
return res;
}
void
sys_vm_leave (lua_State *L)
{
(void) L;
if (g_TLSIndex != INVALID_TLS_INDEX) {
struct sys_thread *td = sys_thread_get();
if (td) {
sys_vm2_preleave(td);
thread_critsect_leave(td->vmcsp);
}
}
}
void
sys_vm_enter (lua_State *L)
{
if (g_TLSIndex != INVALID_TLS_INDEX) {
struct sys_thread *td = sys_thread_get();
if (td) {
thread_critsect_enter(td->vmcsp);
sys_vm2_postenter(td);
if (td->flags) sys_thread_check(td, L);
}
}
}
/*
* Arguments: [timeout (milliseconds)]
* Returns: [boolean]
*/
static int
thread_suspend_wrap (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
const msec_t timeout = lua_isnoneornil(L, 1)
? TIMEOUT_INFINITE : (msec_t) lua_tointeger(L, 1);
const int res = sys_thread_suspend(td, timeout);
if (res >= 0) {
if (res == 1) {
lua_pushboolean(L, 0);
return 1; /* timed out */
}
lua_pushboolean(L, 1);
return 1;
}
return sys_seterror(L, 0);
}
/*
* Arguments: thread_udata,
* [success/failure (boolean) | status (number)]
*/
static int
thread_set_terminate (lua_State *L)
{
struct sys_thread *td = checkudata(L, 1, THREAD_TYPENAME);
const lua_Integer status = !lua_isboolean(L, 2) ? lua_tointeger(L, 2)
: (lua_toboolean(L, 2) ? EXIT_SUCCESS : EXIT_FAILURE);
td = thread_unfake(td);
td->exit_status = status;
td->flags = SYS_THREAD_TERMINATE;
if (td == sys_thread_get())
thread_exit(td);
else
(void) thread_cancel_syncio(td->tid);
return 0;
}
/*
* Arguments: thread_udata, [recover/interrupt (boolean)]
*/
static int
thread_set_interrupt (lua_State *L)
{
struct sys_thread *td = checkudata(L, 1, THREAD_TYPENAME);
const int recover = lua_toboolean(L, 2);
td = thread_unfake(td);
if (recover) {
td->flags &= ~SYS_THREAD_INTERRUPT;
return 0;
}
td->flags = SYS_THREAD_INTERRUPT;
if (td == sys_thread_get())
sys_thread_check(td, L);
else
(void) thread_cancel_syncio(td->tid);
return 0;
}
/*
* Arguments: ecb_udata, [membuf_udata, count (number)]
* Returns: [string | count (number)]
*/
static int
ecb_read (lua_State *L)
{
LPEXTENSION_CONTROL_BLOCK ecb = lua_unboxpointer(L, 1, ECB_TYPENAME);
size_t n = !lua_isnumber(L, -1) ? ~((size_t) 0)
: (size_t) lua_tointeger(L, -1);
const size_t len = n; /* how much total to read */
size_t rlen; /* how much to read */
int nr; /* number of bytes actually read */
struct sys_thread *td = sys_thread_get();
struct sys_buffer sb;
char buf[SYS_BUFSIZE];
int res = 0;
sys_buffer_write_init(L, 2, &sb, buf, sizeof(buf));
do {
rlen = (n <= sb.size) ? n : sb.size;
if (td) sys_vm2_leave(td);
{
DWORD l;
nr = ecb->ReadClient(ecb->ConnID, sb.ptr.w, &l) ? (int) l : -1;
}
if (td) sys_vm2_enter(td);
if (nr == -1) break;
n -= nr; /* still have to read `n' bytes */
} while ((n != 0L && nr == (int) rlen) /* until end of count or eof */
&& sys_buffer_write_next(L, &sb, buf, 0));
if (nr <= 0 && len == n) {
res = -1;
} else {
if (!sys_buffer_write_done(L, &sb, buf, nr))
lua_pushinteger(L, len - n);
}
if (td) sys_thread_check(td);
if (!res) return 1;
return sys_seterror(L, 0);
}
/*
* Arguments: dpool_udata, [timeout (milliseconds)]
* Returns: data_items (any) ...
*/
static int
dpool_get (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
struct data_pool *dp = checkudata(L, 1, DPOOL_TYPENAME);
const msec_t timeout = lua_isnoneornil(L, 2)
? TIMEOUT_INFINITE : (msec_t) lua_tointeger(L, 2);
int nput;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
lua_settop(L, 1);
lua_getfenv(L, 1); /* storage */
lua_insert(L, 1);
if ((dp->flags & DPOOL_GETONEMPTY) && !dp->n) {
lua_rawgetp(L, 1, (void *) DPOOL_GETONEMPTY);
lua_insert(L, 2);
lua_call(L, 1, LUA_MULTRET);
nput = lua_gettop(L) - 1;
if (nput) return nput;
}
for (; ; ) {
/* get from storage */
if (dp->n) {
const int idx = dp->idx + 1;
int i;
lua_rawgeti(L, 1, idx);
nput = lua_tointeger(L, -1);
lua_pushnil(L);
lua_rawseti(L, 1, idx);
dp->idx = idx + nput;
for (i = dp->idx; i > idx; --i) {
lua_rawgeti(L, 1, i);
lua_pushnil(L);
lua_rawseti(L, 1, i);
}
if (dp->idx == dp->top)
dp->idx = dp->top = 0;
if (dp->n-- == dp->max) {
thread_event_signal(&dp->tev);
}
return nput;
}
/* wait signal */
{
int res;
dp->nwaits++;
res = thread_event_wait(&dp->tev, td, timeout);
dp->nwaits--;
sys_thread_check(td);
if (res) {
if (res == 1) {
lua_pushboolean(L, 0);
return 1; /* timed out */
}
return sys_seterror(L, 0);
}
}
/* get directly from another thread */
nput = dp->nput;
if (nput) {
dp->nput = 0;
luaL_checkstack(L, nput, NULL);
lua_xmove(dp->td->L, L, nput);
return nput;
}
}
}
/*
* Arguments: pipe_udata, message_items (any) ...
* Returns: [pipe_udata | timedout (false)]
*/
static int
pipe_put (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
struct pipe_ref *pr = checkudata(L, 1, PIPE_TYPENAME);
struct pipe *pp = pr->pipe;
thread_critsect_t *csp = pipe_critsect_ptr(pp);
struct message msg;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
pipe_msg_build(L, &msg, 2); /* construct the message */
/* write message to buffer */
thread_critsect_enter(csp);
for (; ; ) {
struct pipe_buf *pb = pp->wbuf;
struct pipe_buf buf = *pb;
const int wrapped = (buf.end < buf.begin);
const unsigned int len = (wrapped ? buf.begin : buf.len) - buf.end;
if (msg.size > len) {
if (!wrapped && buf.begin > msg.size) {
/* wrap the buffer */
struct message *mp = pipe_buf_ptr(pb, buf.end);
mp->size = 0; /* sentinel tag */
buf.end = 0;
} else if (pb != buf.next_buf
&& !buf.next_buf->begin && !buf.next_buf->end) {
/* use next free buffer */
pb = pp->wbuf = buf.next_buf;
buf = *pb;
} else {
const unsigned int buf_size = pp->buf_size;
struct pipe_buf *wpb = (2 * buf_size <= pp->buf_max_size)
? malloc(buf_size) : NULL;
if (wpb) {
/* allocate new buffer */
buf.begin = buf.end = 0;
buf.len = buf_size - PIPE_BUF_EXTRASIZE;
/* buf->next_buf is already correct */
pb->next_buf = wpb;
pp->buf_size = buf_size * 2;
pp->wbuf = wpb;
pb = wpb;
} else {
/* wait `get' signal */
int res;
pp->signal_on_get++;
res = pipe_cond_wait(&pp->get_cond, csp, td, pr->put_timeout);
if (--pp->signal_on_get) {
(void) thread_cond_signal(&pp->get_cond);
}
if (!res) continue;
thread_critsect_leave(csp);
sys_thread_check(td);
if (res == 1) {
lua_pushboolean(L, 0);
return 1; /* timed out */
}
return sys_seterror(L, 0);
}
}
}
memcpy(pipe_buf_ptr(pb, buf.end), &msg, msg.size);
buf.end += msg.size;
*pb = buf;
pp->nmsg++;
break;
}
if (pp->signal_on_put) {
(void) thread_cond_signal(&pp->put_cond);
}
thread_critsect_leave(csp);
lua_settop(L, 1);
return 1;
}
/*
* Arguments: pipe_udata, [timeout (milliseconds)]
* Returns: [pipe_udata | timedout (false), message_items (any) ...]
*/
static int
pipe_get (lua_State *L)
{
struct sys_thread *td = sys_thread_get();
struct pipe *pp = lua_unboxpointer(L, 1, PIPE_TYPENAME);
const msec_t timeout = lua_isnoneornil(L, 2)
? TIMEOUT_INFINITE : (msec_t) lua_tointeger(L, 2);
thread_critsect_t *csp = pipe_critsect_ptr(pp);
struct message msg;
if (!td) luaL_argerror(L, 0, "Threading not initialized");
/* read message from buffer */
thread_critsect_enter(csp);
for (; ; ) {
if (pp->nmsg) {
struct pipe_buf *pb = pp->rbuf;
struct pipe_buf buf = *pb;
struct message *mp = pipe_buf_ptr(pb, buf.begin);
if (!mp->size) { /* buffer is wrapped */
mp = pipe_buf_ptr(pb, 0);
buf.begin = 0;
}
memcpy(&msg, mp, mp->size);
buf.begin += mp->size;
if (buf.begin == buf.end) {
buf.begin = buf.end = 0;
if (pp->nmsg > 1)
pp->rbuf = buf.next_buf;
} else if (buf.begin == buf.len) {
buf.begin = 0;
}
*pb = buf;
if (--pp->nmsg && pp->signal_on_put) {
(void) thread_cond_signal(&pp->put_cond);
}
} else {
/* wait `put' signal */
int res;
pp->signal_on_put++;
res = pipe_cond_wait(&pp->put_cond, csp, td, timeout);
pp->signal_on_put--;
if (!res) continue;
thread_critsect_leave(csp);
sys_thread_check(td);
if (res == 1) {
lua_pushboolean(L, 0);
return 1; /* timed out */
}
return sys_seterror(L, 0);
}
break;
}
if (pp->signal_on_get) {
(void) thread_cond_signal(&pp->get_cond);
}
thread_critsect_leave(csp);
lua_settop(L, 1);
return 1 + pipe_msg_parse(L, &msg); /* deconstruct the message */
}
/*
* Arguments: options (table: {1..n: library names, "cpu": number}),
* filename (string) | function_dump (string),
* [arguments (string | number | boolean | ludata | share_object) ...]
* Returns: [thread_udata]
*/
static int
thread_runvm (lua_State *L)
{
const char *path = luaL_checkstring(L, 2);
struct sys_thread *vmtd = sys_thread_get();
struct sys_thread *td, *faketd;
lua_State *NL;
unsigned int loadlibs = ~0U; /* load all standard libraries */
int is_affin = 0, cpu = 0;
if (!vmtd) luaL_argerror(L, 0, "Threading not initialized");
/* options */
if (lua_istable(L, 1)) {
unsigned int libs = 0;
int i;
for (i = 1; ; ++i) {
const char *s;
lua_rawgeti(L, 1, i);
s = lua_tostring(L, -1);
if (!s || !*s) {
if (s) loadlibs = 0; /* don't load any libraries */
lua_pop(L, 1);
break;
}
libs |= 1 << luaL_checkoption(L, -1, NULL, stdlib_names);
lua_pop(L, 1);
}
if (libs) loadlibs = libs;
/* CPU affinity */
lua_getfield(L, 1, "cpu");
if (lua_type(L, -1) == LUA_TNUMBER) {
cpu = (int) lua_tointeger(L, -1);
is_affin = 1;
}
lua_pop(L, 1);
}
td = thread_newvm(NULL, vmtd, loadlibs);
if (!td) goto err;
faketd = sys_thread_new(L, vmtd, td, 1);
if (!faketd) goto err;
lua_replace(L, 1); /* fake thread_udata */
if (is_affin)
td->vmtd->cpu = cpu;
NL = td->L;
/* function */
if (path[0] == LUA_SIGNATURE[0]
? luaL_loadbuffer(NL, path, lua_rawlen(L, ARG_LAST), "thread")
: luaL_loadfile(NL, path)) {
lua_pushstring(L, lua_tostring(NL, -1)); /* error message */
lua_close(NL);
lua_error(L);
}
/* arguments */
{
int i, top = lua_gettop(L);
luaL_checkstack(NL, top + LUA_MINSTACK, "too many arguments");
for (i = ARG_LAST + 1; i <= top; ++i) {
switch (lua_type(L, i)) {
case LUA_TSTRING:
{
size_t len;
const char *s = lua_tolstring(L, i, &len);
lua_pushlstring(NL, s, len);
}
break;
case LUA_TNUMBER:
lua_pushnumber(NL, lua_tonumber(L, i));
break;
case LUA_TBOOLEAN:
lua_pushboolean(NL, lua_toboolean(L, i));
break;
case LUA_TLIGHTUSERDATA:
lua_pushlightuserdata(NL, lua_touserdata(L, i));
break;
case LUA_TUSERDATA:
if (!luaL_getmetafield(L, i, THREAD_XDUP_TAG))
luaL_argerror(L, i, "shareable object expected");
lua_pushvalue(L, i);
lua_pushlightuserdata(L, NL);
lua_call(L, 2, 0);
break;
case LUA_TNIL:
lua_pushnil(NL);
break;
default:
luaL_argerror(L, i, "primitive type expected");
}
}
}
if (!sys_thread_create(td, is_affin)) {
faketd->tid = td->tid;
lua_settop(L, 1);
return 1;
}
lua_close(NL);
err:
return sys_seterror(L, 0);
}
