| 55,6 → 55,8 |
|---|
| * taken before the newly selected |
| * tread is passed control. |
| * |
| * THREAD->lock is locked on entry |
| * |
| */ |
| void before_thread_runs(void) |
| { |
| 69,7 → 71,7 |
|---|
| if (THREAD->fpu_context_exists) |
| fpu_context_restore(&(THREAD->saved_fpu_context)); |
| else { |
| fpu_init(); |
| fpu_init(&(THREAD->saved_fpu_context)); |
| THREAD->fpu_context_exists=1; |
| } |
| #endif |
| 79,19 → 81,29 |
|---|
| void scheduler_fpu_lazy_request(void) |
| { |
| fpu_enable(); |
| spinlock_lock(&CPU->lock); |
| |
| /* Save old context */ |
| if (CPU->fpu_owner != NULL) { |
| spinlock_lock(&CPU->fpu_owner->lock); |
| fpu_context_save(&CPU->fpu_owner->saved_fpu_context); |
| /* don't prevent migration */ |
| CPU->fpu_owner->fpu_context_engaged=0; |
| spinlock_unlock(&CPU->fpu_owner->lock); |
| } |
| |
| spinlock_lock(&THREAD->lock); |
| if (THREAD->fpu_context_exists) |
| fpu_context_restore(&THREAD->saved_fpu_context); |
| else { |
| fpu_init(); |
| fpu_init(&(THREAD->saved_fpu_context)); |
| THREAD->fpu_context_exists=1; |
| } |
| CPU->fpu_owner=THREAD; |
| THREAD->fpu_context_engaged = 1; |
| |
| spinlock_unlock(&THREAD->lock); |
| spinlock_unlock(&CPU->lock); |
| } |
| #endif |
| |