/*
* Call a function ('func_name') in the keeper state, and pass on the returned
* values to 'L'.
*
* 'linda': deep Linda pointer (used only as a unique table key, first parameter)
* 'starting_index': first of the rest of parameters (none if 0)
*
* Returns: number of return values (pushed to 'L') or -1 in case of error
*/
int keeper_call( lua_State *K, keeper_api_t _func, lua_State *L, void *linda, uint_t starting_index)
{
int const args = starting_index ? (lua_gettop( L) - starting_index + 1) : 0;
int const Ktos = lua_gettop( K);
int retvals = -1;
STACK_GROW( K, 2);
PUSH_KEEPER_FUNC( K, _func);
lua_pushlightuserdata( K, linda);
if( (args == 0) || luaG_inter_copy( L, K, args, eLM_ToKeeper) == 0) // L->K
{
lua_call( K, 1 + args, LUA_MULTRET);
retvals = lua_gettop( K) - Ktos;
// note that this can raise a luaL_error while the keeper state (and its mutex) is acquired
// this may interrupt a lane, causing the destruction of the underlying OS thread
// after this, another lane making use of this keeper can get an error code from the mutex-locking function
// when attempting to grab the mutex again (WINVER <= 0x400 does this, but locks just fine, I don't know about pthread)
if( (retvals > 0) && luaG_inter_move( K, L, retvals, eLM_FromKeeper) != 0) // K->L
{
retvals = -1;
}
}
// whatever happens, restore the stack to where it was at the origin
lua_settop( K, Ktos);
return retvals;
}
/*
* Call a function ('func_name') in the keeper state, and pass on the returned
* values to 'L'.
*
* 'linda': deep Linda pointer (used only as a unique table key, first parameter)
* 'starting_index': first of the rest of parameters (none if 0)
*
* Returns: number of return values (pushed to 'L') or -1 in case of error
*/
int keeper_call( lua_State *K, keeper_api_t _func, lua_State *L, void *linda, uint_t starting_index)
{
int const args = starting_index ? (lua_gettop( L) - starting_index + 1) : 0;
int const Ktos = lua_gettop( K);
int retvals = -1;
STACK_GROW( K, 2);
PUSH_KEEPER_FUNC( K, _func);
lua_pushlightuserdata( K, linda);
if( (args == 0) || luaG_inter_copy( L, K, args) == 0) // L->K
{
lua_call( K, 1 + args, LUA_MULTRET);
retvals = lua_gettop( K) - Ktos;
if( (retvals > 0) && luaG_inter_move( K, L, retvals) != 0) // K->L
{
retvals = -1;
}
}
// whatever happens, restore the stack to where it was at the origin
lua_settop( K, Ktos);
return retvals;
}
