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This commit is contained in:
Robert Morris 2019-07-10 14:54:34 -04:00
parent e6addf25bb
commit 4bc900e78b
3 changed files with 4 additions and 6 deletions
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4
kernel/proc.c
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@ -64,8 +64,10 @@ allocpid() {
int pid; int pid;
acquire(&pid_lock); acquire(&pid_lock);
pid = nextpid++; pid = nextpid;
nextpid = nextpid + 1;
release(&pid_lock); release(&pid_lock);
return pid; return pid;
} }

4
kernel/spinlock.c
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@ -18,8 +18,6 @@ initlock(struct spinlock *lk, char *name)
// Acquire the lock. // Acquire the lock.
// Loops (spins) until the lock is acquired. // Loops (spins) until the lock is acquired.
// Holding a lock for a long time may cause
// other CPUs to waste time spinning to acquire it.
void void
acquire(struct spinlock *lk) acquire(struct spinlock *lk)
{ {
@ -81,7 +79,7 @@ holding(struct spinlock *lk)
} }
// push_off/pop_off are like intr_off()/intr_on() except that they are matched: // push_off/pop_off are like intr_off()/intr_on() except that they are matched:
// it takes two pop_off to undo two push_off. Also, if interrupts // it takes two pop_off()s to undo two push_off()s. Also, if interrupts
// are initially off, then push_off, pop_off leaves them off. // are initially off, then push_off, pop_off leaves them off.
void void

2
kernel/spinlock.h
View file

@ -5,7 +5,5 @@ struct spinlock {
// For debugging: // For debugging:
char *name; // Name of lock. char *name; // Name of lock.
struct cpu *cpu; // The cpu holding the lock. struct cpu *cpu; // The cpu holding the lock.
struct cpu *last_release;
uint64 last_pc;
}; };