*/
int CPU_HAS_LOCK(struct sShortSpinlock *Lock)
{
- #if STACKED_LOCKS == 1
return Lock->Lock == GetCPUNum() + 1;
- #elif STACKED_LOCKS == 2
- return Lock->Lock == Proc_GetCurThread();
- #else
- return 0;
- #endif
}
/**
void SHORTLOCK(struct sShortSpinlock *Lock)
{
int v = 1;
- #if LOCK_DISABLE_INTS
int IF;
- #endif
- #if STACKED_LOCKS == 1
int cpu = GetCPUNum() + 1;
- #elif STACKED_LOCKS == 2
- void *thread = Proc_GetCurThread();
- #endif
- #if LOCK_DISABLE_INTS
// Save interrupt state
__ASM__ ("pushf;\n\tpop %0" : "=r"(IF));
IF &= 0x200; // AND out all but the interrupt flag
- #endif
-
- #if STACKED_LOCKS == 1
- if( Lock->Lock == cpu ) {
- Lock->Depth ++;
- return ;
- }
- #elif STACKED_LOCKS == 2
- if( Lock->Lock == thread ) {
- Lock->Depth ++;
- return ;
- }
- #endif
#if TRACE_LOCKS
if( Lock != &glDebug_Lock && Lock != &glThreadListLock )
}
#endif
+ __ASM__("cli");
+
// Wait for another CPU to release
while(v) {
- // 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
+ __ASM__("xchgl %%eax, (%%edi)":"=a"(v):"a"(cpu),"D"(&Lock->Lock));
}
- #if LOCK_DISABLE_INTS
- __ASM__("cli");
Lock->IF = IF;
- #endif
#if TRACE_LOCKS
if( Lock != &glDebug_Lock && Lock != &glThreadListLock )
*/
void SHORTREL(struct sShortSpinlock *Lock)
{
- #if STACKED_LOCKS
- if( Lock->Depth ) {
- Lock->Depth --;
- return ;
- }
- #endif
-
#if TRACE_LOCKS
if( Lock != &glDebug_Lock && Lock != &glThreadListLock )
{
}
#endif
- #if LOCK_DISABLE_INTS
// Lock->IF can change anytime once Lock->Lock is zeroed
if(Lock->IF) {
Lock->Lock = 0;
else {
Lock->Lock = 0;
}
- #else
- Lock->Lock = 0;
- #endif
}
// === DEBUG IO ===