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rsc 2006-09-08 15:18:58 +00:00
parent 5788b3604a
commit ba969aa6a8
1 changed files with 2 additions and 2 deletions
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spinlock.c
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@ -53,7 +53,7 @@ acquire(struct spinlock *lock)
// Serialize instructions: now that lock is acquired, make sure // Serialize instructions: now that lock is acquired, make sure
// we wait for all pending writes from other processors. // we wait for all pending writes from other processors.
cpuid(0, 0, 0, 0, 0); // memory barrier (see Ch 7 of IA-32 manual, vol 3) cpuid(0, 0, 0, 0, 0); // memory barrier (see Ch 7, IA-32 manual vol 3)
// Record info about lock acquisition for debugging. // Record info about lock acquisition for debugging.
// The +10 is only so that we can tell the difference // The +10 is only so that we can tell the difference
@ -75,7 +75,7 @@ release(struct spinlock *lock)
// Serialize instructions: before unlocking the lock, make sure // Serialize instructions: before unlocking the lock, make sure
// to flush any pending memory writes from this processor. // to flush any pending memory writes from this processor.
cpuid(0, 0, 0, 0, 0); // memory barrier (see Ch 7 of IA-32 manual, vol 3) cpuid(0, 0, 0, 0, 0); // memory barrier (see Ch 7, IA-32 manual vol 3)
lock->locked = 0; lock->locked = 0;
if(--cpus[cpu()].nlock == 0) if(--cpus[cpu()].nlock == 0)