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kernel/mem_slab: Spinlockify

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Use a subsystem lock instead of a per-slab lock for now

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-07-25 11:04:06 -07:00 • committed by Anas Nashif
commit c0bdcbaaf8
1 changed files with 8 additions and 6 deletions
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14
kernel/mem_slab.c
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@ -17,6 +17,8 @@
extern struct k_mem_slab _k_mem_slab_list_start[];
extern struct k_mem_slab _k_mem_slab_list_end[];
static struct k_spinlock lock;
#ifdef CONFIG_OBJECT_TRACING
struct k_mem_slab *_trace_list_k_mem_slab;
#endif /* CONFIG_OBJECT_TRACING */
@ -90,7 +92,7 @@ void k_mem_slab_init(struct k_mem_slab *slab, void *buffer,
int k_mem_slab_alloc(struct k_mem_slab *slab, void **mem, s32_t timeout)
{
unsigned int key = irq_lock();
k_spinlock_key_t key = k_spin_lock(&lock);
int result;
/* block size must be word aligned */
@ -109,31 +111,31 @@ int k_mem_slab_alloc(struct k_mem_slab *slab, void **mem, s32_t timeout)
result = -ENOMEM;
} else {
/* wait for a free block or timeout */
result = _pend_curr_irqlock(key, &slab->wait_q, timeout);
result = _pend_curr(&lock, key, &slab->wait_q, timeout);
if (result == 0) {
*mem = _current->base.swap_data;
}
return result;
}
irq_unlock(key);
k_spin_unlock(&lock, key);
return result;
}
void k_mem_slab_free(struct k_mem_slab *slab, void **mem)
{
int key = irq_lock();
k_spinlock_key_t key = k_spin_lock(&lock);
struct k_thread *pending_thread = _unpend_first_thread(&slab->wait_q);
if (pending_thread != NULL) {
_set_thread_return_value_with_data(pending_thread, 0, *mem);
_ready_thread(pending_thread);
_reschedule_irqlock(key);
_reschedule(&lock, key);
} else {
**(char ***)mem = slab->free_list;
slab->free_list = *(char **)mem;
slab->num_used--;
irq_unlock(key);
k_spin_unlock(&lock, key);
}
}