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wifi-tally_Oostendam/nodemcu-firmware/app/lua53/lnodemcu.c

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Initial commit
2021-09-27 19:52:27 +00:00
#define lnodemcu_c
#define LUA_CORE
#include "lua.h"
#include <string.h>
#include <stdlib.h>
#include "lobject.h"
#include "lstate.h"
#include "lapi.h"
#include "lauxlib.h"
#include "lfunc.h"
#include "lgc.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lnodemcu.h"
#include "lundump.h"
#include "lzio.h"
#ifdef LUA_USE_ESP
#include "platform.h"
#include "user_interface.h"
#include "vfs.h"
#endif
/*
** This is a mixed bag of NodeMCU additions broken into the following sections:
** * POSIX vs VFS file API abstraction
** * Emulate Platform_XXX() API
** * ESP and HOST lua_debugbreak() test stubs
** * NodeMCU lua.h LUA_API extensions
** * NodeMCU lauxlib.h LUALIB_API extensions
** * NodeMCU bootstrap to set up and to reimage LFS resources
**
** Just search down for //== or ==// to flip through the sections.
*/
#define byte_addr(p) cast(char *,p)
#define byteptr(p) cast(lu_byte *, p)
#define byteoffset(p,q) ((int) cast(ptrdiff_t, (byteptr(p) - byteptr(q))))
#define wordptr(p) cast(lu_int32 *, p)
#define wordoffset(p,q) (wordptr(p) - wordptr(q))
//====================== Wrap POSIX and VFS file API =========================//
#ifdef LUA_USE_ESP
int luaopen_file(lua_State *L);
# define l_file(f) int f
# define l_open(f) vfs_open(f, "r")
# define l_close(f) vfs_close(f)
# define l_feof(f) vfs_eof(f)
# define l_read(f,b) vfs_read(f, b, sizeof (b))
# define l_rewind(f) vfs_lseek(f, 0, VFS_SEEK_SET)
#else
# define l_file(f) FILE *f
# define l_open(n) fopen(n,"rb")
# define l_close(f) fclose(f)
# define l_feof(f) feof(f)
# define l_read(f,b) fread(b, 1, sizeof (b), f)
# define l_rewind(f) rewind(f)
#endif
#ifdef LUA_USE_ESP
extern void dbg_printf(const char *fmt, ...); // DEBUG
#undef printf
#define printf(...) dbg_printf(__VA_ARGS__) // DEBUG
#define FLASH_PAGE_SIZE INTERNAL_FLASH_SECTOR_SIZE
/* Erasing the LFS invalidates ESP instruction cache, so doing a block 64Kb */
/* read is the simplest way to flush the icache, restoring cache coherency */
#define flush_icache(F) \
UNUSED(memcmp(F->addr, F->addr+(0x8000/sizeof(*F->addr)), 0x8000));
#define unlockFlashWrite()
#define lockFlashWrite()
#else // LUA_USE_HOST
//==== Emulate Platform_XXX() API within host luac.cross -e environement =====//
#include<stdio.h> // DEBUG
/*
** The ESP implementation use a platform_XXX() API to provide a level of
** H/W abstraction. The following functions and macros emulate a subset
** of this API for the host environment. LFSregion is the true address in
** the luac process address space of the mapped LFS region. All actual
** erasing and writing is done relative to this address.
**
** In normal LFS emulation the LFSaddr is also set to this LFSregion address
** so that any subsequent execution using LFS refers to the correct memory
** address.
**
** The second LFS mode is used to create absolute LFS images for directly
** downloading to the ESP or including in a firmware image, and in this case
** LFSaddr refers to the actual ESP mapped address of the ESP LFS region.
** This is a 32-bit address typically in the address range 0x40210000-0x402FFFFF
** (and with the high 32bits set to 0 in the case of 64-bit execution). Such
** images are solely intended for ESP execution and any attempt to execute
** them in a host execution environment will result in an address exception.
*/
#define PLATFORM_RCR_FLASHLFS 4
#define LFS_SIZE 0x40000
#define FLASH_PAGE_SIZE 0x1000
#define FLASH_BASE 0x90000 /* Some 'Random' but typical value */
#define IROM0_SEG 0x40210000ul
void *LFSregion = NULL;
static void *LFSaddr = NULL;
static size_t LFSbase = FLASH_BASE;
extern char *LFSimageName;
#ifdef __unix__
/* On POSIX systems we can toggle the "Flash" write attribute */
#include <sys/mman.h>
#define aligned_malloc(a,n) posix_memalign(&a, FLASH_PAGE_SIZE, (n))
#define unlockFlashWrite() mprotect(LFSaddr, LFS_SIZE, PROT_READ| PROT_WRITE)
#define lockFlashWrite() mprotect(LFSaddr, LFS_SIZE, PROT_READ)
#else
#define aligned_malloc(a,n) ((a = malloc(n)) == NULL)
#define unlockFlashWrite()
#define lockFlashWrite()
#endif
#define platform_rcr_write(id,rec,l) (128)
#define platform_flash_phys2mapped(n) \
((ptrdiff_t)(((size_t)LFSaddr) - LFSbase) + (n))
#define platform_flash_mapped2phys(n) \
((size_t)(n) - ((size_t)LFSaddr) + LFSbase)
#define platform_flash_get_sector_of_address(n) ((n)>>12)
#define platform_rcr_delete(id) LFSimageName = NULL
#define platform_rcr_read(id,s) \
(*s = LFSimageName, (LFSimageName) ? strlen(LFSimageName) : ~0);
void luaN_setabsolute(lu_int32 addr) {
LFSaddr = cast(void *, cast(size_t, addr));
LFSbase = addr - IROM0_SEG;
}
static lu_int32 platform_flash_get_partition (lu_int32 part_id, lu_int32 *addr) {
lua_assert(part_id == NODEMCU_LFS0_PARTITION);
if (!LFSregion) {
if(aligned_malloc(LFSregion, LFS_SIZE))
return 0;
memset(LFSregion, ~0, LFS_SIZE);
lockFlashWrite();
}
if(LFSaddr == NULL)
LFSaddr = LFSregion;
*addr = LFSbase;
return LFS_SIZE;
}
static void platform_flash_erase_sector(lu_int32 i) {
lua_assert (i >= LFSbase/FLASH_PAGE_SIZE &&
i < (LFSbase+LFS_SIZE)/FLASH_PAGE_SIZE);
unlockFlashWrite();
memset(byteptr(LFSregion) + (i*FLASH_PAGE_SIZE - LFSbase), ~(0), FLASH_PAGE_SIZE);
lockFlashWrite();
}
static void platform_s_flash_write(const void *from, lu_int32 to, lu_int32 len) {
lua_assert(to >= LFSbase && to + len < LFSbase + LFS_SIZE); /* DEBUG */
unlockFlashWrite();
memcpy(byteptr(LFSregion) + (to-LFSbase), from, len);
lockFlashWrite();
}
#define flush_icache(F) /* not needed */
#endif
//============= ESP and HOST lua_debugbreak() test stubs =====================//
#ifdef DEVELOPMENT_USE_GDB
/*
* lua_debugbreak is a stub used by lua_assert() if DEVELOPMENT_USE_GDB is
* defined. On the ESP, instead of crashing out with an assert error, this hook
* starts the GDB remote stub if not already running and then issues a break.
* The rationale here is that when testing the developer might be using screen /
* PuTTY to work interactively with the Lua Interpreter via UART0. However if
* an assert triggers, then there is the option to exit the interactive session
* and start the Xtensa remote GDB which will then sync up with the remote GDB
* client to allow forensics of the error. On the host it is an stub which can
* be set as a breakpoint in the gdb debugger.
*/
extern void gdbstub_init(void);
extern void gdbstub_redirect_output(int);
LUALIB_API void lua_debugbreak(void) {
#ifdef LUA_USE_HOST
/* allows debug backtrace analysis of assert fails */
lua_writestring(" lua_debugbreak ", sizeof(" lua_debugbreak ")-1);
#else
static int repeat_entry = 0;
if (repeat_entry == 0) {
dbg_printf("Start up the gdb stub if not already started\n");
gdbstub_init();
gdbstub_redirect_output(1);
repeat_entry = 1;
}
asm("break 0,0" ::);
#endif
}
#endif
//===================== NodeMCU lua.h API extensions =========================//
LUA_API int lua_freeheap (void) {
#ifdef LUA_USE_HOST
return MAX_INT;
#else
return (int) platform_freeheap();
#endif
}
LUA_API int lua_pushstringsarray(lua_State *L, int opt) {
stringtable *strt = NULL;
int i, j = 1;
lua_lock(L);
if (opt == 0)
strt = &G(L)->strt;
#ifdef LUA_USE_ESP
else if (opt == 1 && G(L)->ROstrt.hash)
strt = &G(L)->ROstrt;
#endif
if (strt == NULL) {
setnilvalue(L->top);
api_incr_top(L);
lua_unlock(L);
return 0;
}
Table *t = luaH_new(L);
sethvalue(L, L->top, t);
api_incr_top(L);
luaH_resize(L, t, strt->nuse, 0);
luaC_checkGC(L);
lua_unlock(L);
/* loop around all strt hash entries */
for (i = 0, j = 1; i < strt->size; i++) {
TString *e;
/* loop around all TStings in this entry's chain */
for(e = strt->hash[i]; e; e = e->u.hnext) {
TValue s;
setsvalue(L, &s, e);
luaH_setint(L, hvalue(L->top-1), j++, &s);
}
}
return 1;
}
LUA_API void lua_createrotable (lua_State *L, ROTable *t,
const ROTable_entry *e, ROTable *mt) {
int i, j;
lu_byte flags = ~0;
const char *plast = (char *)"_";
for (i = 0; e[i].key; i++) {
if (e[i].key[0] == '_' && strcmp(e[i].key,plast)) {
plast = e[i].key;
lua_pushstring(L,e[i].key);
for (j=0; j<TM_EQ; j++){
if(tsvalue(L->top-1)==G(L)->tmname[i]) {
flags |= cast_byte(1u<<i);
break;
}
}
lua_pop(L,1);
}
}
t->next = (GCObject *)1;
t->tt = LUA_TTBLROF;
t->marked = LROT_MARKED;
t->flags = flags;
t->lsizenode = i;
t->metatable = cast(Table *, mt);
t->entry = cast(ROTable_entry *, e);
}
LUA_API void lua_getlfsconfig (lua_State *L, int *config) {
global_State *g = G(L);
LFSHeader *l = g->l_LFS;
if (!config)
return;
config[0] = (int) (size_t) l; /* LFS region mapped address */
config[1] = platform_flash_mapped2phys(config[0]); /* ditto phys address */
config[2] = g->LFSsize; /* LFS region actual size */
if (g->ROstrt.hash) {
config[3] = l->flash_size; /* LFS region used */
config[4] = l->timestamp; /* LFS region timestamp */
} else {
config[3] = config[4] = 0;
}
}
LUA_API int (lua_pushlfsindex) (lua_State *L) {
lua_lock(L);
setobj2n(L, L->top, &G(L)->LFStable);
api_incr_top(L);
lua_unlock(L);
return ttnov(L->top-1);
}
/*
* In Lua 5.3 luac.cross generates a top level Proto for each source file with
* one upvalue that must be the set to the _ENV variable when its closure is
* created, and as such this parallels some ldo.c processing.
*/
LUA_API int (lua_pushlfsfunc) (lua_State *L) {
lua_lock(L);
const TValue *t = &G(L)->LFStable;
if (ttisstring(L->top-1) && ttistable(t)) {
const TValue *v = luaH_getstr (hvalue(t), tsvalue(L->top-1));
if (ttislightuserdata(v)) {
Proto *f = pvalue(v); /* The pvalue is a Proto * for the Lua function */
LClosure *cl = luaF_newLclosure(L, f->sizeupvalues);
setclLvalue(L, L->top-1, cl);
luaF_initupvals(L, cl);
cl->p = f;
if (cl->nupvalues >= 1) { /* does it have an upvalue? */
UpVal *uv1 = cl->upvals[0];
TValue *val = uv1->v;
/* set 1st upvalue as global env table from registry */
setobj(L, val, luaH_getint(hvalue(&G(L)->l_registry), LUA_RIDX_GLOBALS));
luaC_upvalbarrier(L, uv1);
}
return 1;
}
}
setnilvalue(L->top-1);
lua_unlock(L);
return 0;
}
//================ NodeMCU lauxlib.h LUALIB_API extensions ===================//
/*
* Return an array of functions in LFS
*/
LUALIB_API int (luaL_pushlfsmodules) (lua_State *L) {
int i = 1;
if (lua_pushlfsindex(L) == LUA_TNIL)
return 0; /* return nil if LFS not loaded */
lua_newtable(L); /* create dest table and move above LFS index ROTable */
lua_insert(L, -2);
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
lua_pop(L, 1); /* dump the value (ptr to the Proto) */
lua_pushvalue(L, -1); /* dup key (module name) */
lua_rawseti(L, -4, i++);
}
lua_pop(L, 1); /* dump the LFS index ROTable */
return 1;
}
LUALIB_API int (luaL_pushlfsdts) (lua_State *L) {
int config[5];
lua_getlfsconfig(L, config);
lua_pushinteger(L, config[4]);
return 1;
}
//======== NodeMCU bootstrap to set up and to reimage LFS resources ==========//
/*
** This processing uses 2 init hooks during the Lua startup. The first is
** called early in the Lua state setup to initialize the LFS if present. The
** second is only used to rebuild the LFS region; this requires the Lua
** environment to be in place, so this second hook is immediately before
** processing LUA_INIT.
**
** An application library initiates an LFS rebuild by writing a FLASHLFS
** message to the Reboot Config Record area (RCR), and then restarting the
** processor. This RCR record is read during startup by the 2nd hook. The
** content is the name of the Lua LFS image file to be loaded. If present then
** the LFS reload process is initiated instead of LUA_INIT. This uses lundump
** functions to load the components directly into the LFS region.
**
** FlashState used to share context with the low level lua_load write routines
** is passed as a ZIO data field. Note this is only within the phase
** processing and not across phases.
*/
typedef struct LFSflashState {
lua_State *L;
LFSHeader hdr;
l_file(f);
const char *LFSfileName;
lu_int32 *addr;
lu_int32 oNdx; /* in size_t units */
lu_int32 oChunkNdx; /* in size_t units */
lu_int32 *oBuff; /* FLASH_PAGE_SIZE bytes */
lu_byte *inBuff; /* FLASH_PAGE_SIZE bytes */
lu_int32 inNdx; /* in bytes */
lu_int32 addrPhys;
lu_int32 size;
lu_int32 allocmask;
stringtable ROstrt;
GCObject *pLTShead;
} LFSflashState;
#define WORDSIZE sizeof(lu_int32)
#define OSIZE (FLASH_PAGE_SIZE/WORDSIZE)
#define ISIZE (FLASH_PAGE_SIZE)
#ifdef LUA_USE_ESP
#define ALIGN(F,n) (n + WORDSIZE - 1) / WORDSIZE;
#else
#define ALIGN(F,n) ((n + F->allocmask) & ~(F->allocmask)) / WORDSIZE;
#endif
/* This conforms to the ZIO lua_Reader spec, hence the L parameter */
static const char *readF (lua_State *L, void *ud, size_t *size) {
UNUSED(L);
LFSflashState *F = cast(LFSflashState *, ud);
if (F->inNdx > 0) {
*size = F->inNdx;
F->inNdx = 0;
} else {
if (l_feof(F->f)) return NULL;
*size = l_read(F->f, F->inBuff) ; /* read block */
}
return cast(const char *,F->inBuff);
}
static void eraseLFS(LFSflashState *F) {
lu_int32 i;
printf("\nErasing LFS from flash addr 0x%06x", F->addrPhys);
unlockFlashWrite();
for (i = 0; i < F->size; i += FLASH_PAGE_SIZE) {
size_t *f = cast(size_t *, F->addr + i/sizeof(*f));
lu_int32 s = platform_flash_get_sector_of_address(F->addrPhys + i);
/* it is far faster not erasing if you don't need to */
#ifdef LUA_USE_ESP
if (*f == ~0 && !memcmp(f, f + 1, FLASH_PAGE_SIZE - sizeof(*f)))
continue;
#endif
platform_flash_erase_sector(s);
printf(".");
}
printf(" to 0x%06x\n", F->addrPhys + F->size-1);
flush_icache(F);
lockFlashWrite();
}
LUAI_FUNC void luaN_setFlash(void *F, unsigned int o) {
luaN_flushFlash(F); /* flush the pending write buffer */
lua_assert((o & (WORDSIZE-1))==0);
cast(LFSflashState *,F)->oChunkNdx = o/WORDSIZE;
}
LUAI_FUNC void luaN_flushFlash(void *vF) {
LFSflashState *F = cast(LFSflashState *, vF);
lu_int32 start = F->addrPhys + F->oChunkNdx*WORDSIZE;
lu_int32 size = F->oNdx * WORDSIZE;
lua_assert(start + size < F->addrPhys + F->size); /* is write in bounds? */
//printf("Flush Buf: %6x (%u)\n", F->oNdx, size); //DEBUG
platform_s_flash_write(F->oBuff, start, size);
F->oChunkNdx += F->oNdx;
F->oNdx = 0;
}
LUAI_FUNC void *luaN_writeFlash(void *vF, const void *rec, size_t n) {
LFSflashState *F = cast(LFSflashState *, vF);
lu_byte *p = byteptr(F->addr + F->oChunkNdx + F->oNdx);
//int i; printf("writing %4u bytes:", (lu_int32) n); for (i=0;i<n;i++){printf(" %02x", byteptr(rec)[i]);} printf("\n");
if (n==0)
return p;
while (1) {
int nw = ALIGN(F, n);
if (F->oNdx + nw > OSIZE) {
/* record overflows the buffer so fill buffer, flush and repeat */
int rem = OSIZE - F->oNdx;
if (rem)
memcpy(F->oBuff+F->oNdx, rec, rem * WORDSIZE);
rec = cast(void *, cast(lu_int32 *, rec) + rem);
n -= rem * WORDSIZE;
F->oNdx = OSIZE;
luaN_flushFlash(F);
} else {
/* append remaining record to buffer */
F->oBuff[F->oNdx+nw-1] = 0; /* ensure any trailing odd byte are 0 */
memcpy(F->oBuff+F->oNdx, rec, n);
F->oNdx += nw;
break;
}
}
//int i; for (i=0;i<(rem * WORDSIZE); i++) {printf("%c%02x",i?' ':'.',*((lu_byte*)rec+i));}
//for (i=0;i<n; i++) printf("%c%02x",i?' ':'.',*((lu_byte*)rec+i));
//printf("\n");
return p;
}
/*
** Hook used in Lua Startup to carry out the optional LFS startup processes.
*/
LUAI_FUNC int luaN_init (lua_State *L) {
static LFSflashState *F = NULL;
int n;
static LFSHeader *fh;
/*
* The first entry is called from lstate.c:f_luaopen() before modules
* are initialised. This is detected because F is NULL on first entry.
*/
if (F == NULL) {
size_t Fsize = sizeof(LFSflashState) + OSIZE*WORDSIZE + ISIZE;
/* outlining the buffers just makes debugging easier. Sorry */
F = calloc(Fsize, 1);
F->oBuff = wordptr(F + 1);
F->inBuff = byteptr(F->oBuff + OSIZE);
n = platform_rcr_read(PLATFORM_RCR_FLASHLFS, cast(void**, &F->LFSfileName));
F->size = platform_flash_get_partition (NODEMCU_LFS0_PARTITION, &F->addrPhys);
if (F->size) {
F->addr = cast(lu_int32 *, platform_flash_phys2mapped(F->addrPhys));
fh = cast(LFSHeader *, F->addr);
if (n < 0) {
global_State *g = G(L);
g->LFSsize = F->size;
g->l_LFS = fh;
/* Set up LFS hooks on normal Entry */
if (fh->flash_sig == FLASH_SIG) {
g->seed = fh->seed;
g->ROstrt.hash = cast(TString **, F->addr + fh->oROhash);
g->ROstrt.nuse = fh->nROuse ;
g->ROstrt.size = fh->nROsize;
sethvalue(L, &g->LFStable, cast(Table *, F->addr + fh->protoROTable));
lua_writestringerror("LFS image %s\n", "loaded");
} else if ((fh->flash_sig != 0 && fh->flash_sig != ~0)) {
lua_writestringerror("LFS image %s\n", "corrupted.");
eraseLFS(F);
}
}
}
return 0;
} else { /* hook 2 called from protected pmain, so can throw errors. */
int status = 0;
if (F->LFSfileName) { /* hook == 2 LFS image load */
ZIO z;
/*
* To avoid reboot loops, the load is only attempted once, so we
* always deleted the RCR record if we enter this path. Also note
* that this load process can throw errors and if so these are
* caught by the parent function in lua.c
*/
#ifdef DEVELOPMENT_USE_GDB
/* For GDB builds, prefixing the filename with ! forces a break in the hook */
if (F->LFSfileName[0] == '!') {
lua_debugbreak();
F->LFSfileName++;
}
#endif
platform_rcr_delete(PLATFORM_RCR_FLASHLFS);
#ifdef LUA_USE_ESP
luaopen_file(L);
#endif
if (!(F->f = l_open(F->LFSfileName))) {
free(F);
return luaL_error(L, "cannot open %s", F->LFSfileName);
}
eraseLFS(F);
luaZ_init(L, &z, readF, F);
lua_lock(L);
#ifdef LUA_USE_HOST
F->allocmask = (LFSaddr == LFSregion) ? sizeof(size_t) - 1 :
sizeof(lu_int32) - 1;
status = luaU_undumpLFS(L, &z, LFSaddr != LFSregion);
#else
status = luaU_undumpLFS(L, &z, 0);
#endif
lua_unlock(L);
l_close(F->f);
free(F);
F = NULL;
if (status == LUA_OK)
lua_pushstring(L, "!LFSrestart!"); /* Signal a restart */
lua_error(L); /* throw error / restart request */
} else { /* hook == 2, Normal startup */
free(F);
F = NULL;
}
return status;
}
}
// =============================================================================
#define getfield(L,t,f) \
lua_getglobal(L, #t); luaL_getmetafield( L, 1, #f ); lua_remove(L, -2);
LUALIB_API void luaL_lfsreload (lua_State *L) {
#ifdef LUA_USE_ESP
int n = 0;
size_t l;
int off = 0;
const char *img = lua_tolstring(L, 1, &l);
#ifdef DEVELOPMENT_USE_GDB
if (*img == '!') /* For GDB builds, any leading ! is ignored for checking */
off = 1; /* existence. This forces a debug break in the init hook */
#endif
lua_settop(L, 1);
lua_getglobal(L, "file");
if (lua_isnil(L, 2)) {
lua_pushstring(L, "No file system mounted");
return;
}
lua_getfield(L, 2, "exists");
lua_pushstring(L, img + off);
lua_call(L, 1, 1);
if (G(L)->LFSsize == 0 || lua_toboolean(L, -1) == 0) {
lua_pushstring(L, "No LFS partition allocated");
return;
}
n = platform_rcr_write(PLATFORM_RCR_FLASHLFS, img, l+1);/* incl trailing \0 */
if (n>0) {
system_restart();
luaL_error(L, "system restarting");
}
#endif
}
#ifdef LUA_USE_ESP
extern void lua_main(void);
/*
** Task callback handler. Uses luaN_call to do a protected call with full traceback
*/
static void do_task (platform_task_param_t task_fn_ref, uint8_t prio) {
lua_State* L = lua_getstate();
if(task_fn_ref == (platform_task_param_t)~0 && prio == LUA_TASK_HIGH) {
lua_main(); /* Undocumented hook for lua_main() restart */
return;
}
if (prio < LUA_TASK_LOW|| prio > LUA_TASK_HIGH)
luaL_error(L, "invalid posk task");
/* Pop the CB func from the Reg */
lua_rawgeti(L, LUA_REGISTRYINDEX, (int) task_fn_ref);
luaL_checktype(L, -1, LUA_TFUNCTION);
luaL_unref(L, LUA_REGISTRYINDEX, (int) task_fn_ref);
lua_pushinteger(L, prio);
luaL_pcallx(L, 1, 0);
}
/*
** Schedule a Lua function for task execution
*/
LUALIB_API int luaL_posttask ( lua_State* L, int prio ) { // [-1, +0, -]
static platform_task_handle_t task_handle = 0;
if (!task_handle)
task_handle = platform_task_get_id(do_task);
if (L == NULL && prio == LUA_TASK_HIGH+1) { /* Undocumented hook for lua_main */
platform_post(LUA_TASK_HIGH, task_handle, (platform_task_param_t)~0);
return -1;
}
if (lua_isfunction(L, -1) && prio >= LUA_TASK_LOW && prio <= LUA_TASK_HIGH) {
int task_fn_ref = luaL_ref(L, LUA_REGISTRYINDEX);
if(!platform_post(prio, task_handle, (platform_task_param_t)task_fn_ref)) {
luaL_unref(L, LUA_REGISTRYINDEX, task_fn_ref);
luaL_error(L, "Task queue overflow. Task not posted");
}
return task_fn_ref;
} else {
return luaL_error(L, "invalid posk task");
}
}
#else
/*
** Task execution isn't supported on HOST builds so returns a -1 status
*/
LUALIB_API int luaL_posttask( lua_State* L, int prio ) { // [-1, +0, -]
return -1;
}
#endif
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