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spin-wait based kernel timer (for futex() timeout) implementation

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Balazs Gerofi bgerofi@riken.jp
2012-11-28 15:22:53 +09:00
parent b59e36e1a5
commit 092069fd80
6 changed files with 121 additions and 19 deletions
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20
kernel/process.c
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@@ -58,6 +58,9 @@ struct process *create_process(unsigned long user_pc)
init_process_vm(proc->vm);
aal_mc_spinlock_init(&proc->spin_sleep_lock);
proc->spin_sleep = 0;
return proc;
}
@@ -434,10 +437,12 @@ void sched_init(void)
cpu_local_var(runq_len) = 0;
aal_mc_spinlock_init(&cpu_local_var(runq_lock));
#ifdef TIMER_CPU_ID
if (aal_mc_get_processor_id() == TIMER_CPU_ID) {
init_timers();
wake_timers_loop();
}
#endif
}
void schedule(void)
@@ -514,8 +519,23 @@ void schedule(void)
int sched_wakeup_process(struct process *proc, int valid_states)
{
int status;
int spin_slept = 0;
unsigned long irqstate;
struct cpu_local_var *v = get_cpu_local_var(proc->cpu_id);
irqstate = aal_mc_spinlock_lock(&(proc->spin_sleep_lock));
if (proc->spin_sleep) {
dkprintf("sched_wakeup_process() spin wakeup: cpu_id: %d\n",
proc->cpu_id);
spin_slept = 1;
proc->spin_sleep = 0;
status = 0;
}
aal_mc_spinlock_unlock(&(proc->spin_sleep_lock), irqstate);
if (spin_slept)
return status;
irqstate = aal_mc_spinlock_lock(&(v->runq_lock));