| 646 | |
| 647 | |
| 648 | LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs) { |
| 649 | int status; |
| 650 | unsigned short oldnny = L->nny; /* save "number of non-yieldable" calls */ |
| 651 | lua_lock(L); |
| 652 | if (L->status == LUA_OK) { /* may be starting a coroutine */ |
| 653 | if (L->ci != &L->base_ci) /* not in base level? */ |
| 654 | return resume_error(L, "cannot resume non-suspended coroutine", nargs); |
| 655 | } |
| 656 | else if (L->status != LUA_YIELD) |
| 657 | return resume_error(L, "cannot resume dead coroutine", nargs); |
| 658 | L->nCcalls = (from) ? from->nCcalls + 1 : 1; |
| 659 | if (L->nCcalls >= LUAI_MAXCCALLS) |
| 660 | return resume_error(L, "C stack overflow", nargs); |
| 661 | luai_userstateresume(L, nargs); |
| 662 | L->nny = 0; /* allow yields */ |
| 663 | api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs); |
| 664 | status = luaD_rawrunprotected(L, resume, &nargs); |
| 665 | if (status == -1) /* error calling 'lua_resume'? */ |
| 666 | status = LUA_ERRRUN; |
| 667 | else { /* continue running after recoverable errors */ |
| 668 | while (errorstatus(status) && recover(L, status)) { |
| 669 | /* unroll continuation */ |
| 670 | status = luaD_rawrunprotected(L, unroll, &status); |
| 671 | } |
| 672 | if (errorstatus(status)) { /* unrecoverable error? */ |
| 673 | L->status = cast_byte(status); /* mark thread as 'dead' */ |
| 674 | seterrorobj(L, status, L->top); /* push error message */ |
| 675 | L->ci->top = L->top; |
| 676 | } |
| 677 | else lua_assert(status == L->status); /* normal end or yield */ |
| 678 | } |
| 679 | L->nny = oldnny; /* restore 'nny' */ |
| 680 | L->nCcalls--; |
| 681 | lua_assert(L->nCcalls == ((from) ? from->nCcalls : 0)); |
| 682 | lua_unlock(L); |
| 683 | return status; |
| 684 | } |
| 685 | |
| 686 | |
| 687 | LUA_API int lua_isyieldable (lua_State *L) { |
no test coverage detected