ref: df03eca7e7cbfadf1cf8c8c5a94390eaa5013a8b dir: /lib9/lock-Nt-386.c/
#include "lib9.h" int _tas(int *la) { int v; _asm { mov eax, la mov ebx, 1 xchg ebx, [eax] mov v, ebx } return v; }