ref: 71292834bbafcf6bc409cfd7691f9e6650df025b dir: purgatorio/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; }