- // CMPXCHG:
- // If r/m32 == EAX, set ZF and set r/m32 = r32
- // Else, clear ZF and set EAX = r/m32
- #if STACKED_LOCKS == 1
- __ASM__("lock cmpxchgl %2, (%3)"
- : "=a"(v)
- : "a"(0), "r"(cpu), "r"(&Lock->Lock)
- );
- #elif STACKED_LOCKS == 2
- __ASM__("lock cmpxchgl %2, (%3)"
- : "=a"(v)
- : "a"(0), "r"(thread), "r"(&Lock->Lock)
- );
- #else
- __ASM__("xchgl %%eax, (%%edi)":"=a"(v):"a"(1),"D"(&Lock->Lock));
- #endif
-
- #if LOCK_DISABLE_INTS
- if( v ) __ASM__("sti"); // Re-enable interrupts
- #endif