/*
* Copyright (c) 2010-2016 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @brief fixed-size stack object
*/
#include <kernel.h>
#include <kernel_structs.h>
#include <debug/object_tracing_common.h>
#include <toolchain.h>
#include <linker/sections.h>
#include <ksched.h>
#include <wait_q.h>
#include <sys/check.h>
#include <init.h>
#include <syscall_handler.h>
#include <kernel_internal.h>
#ifdef CONFIG_OBJECT_TRACING
struct k_stack *_trace_list_k_stack;
/*
* Complete initialization of statically defined stacks.
*/
static int init_stack_module(struct device *dev)
{
ARG_UNUSED(dev);
Z_STRUCT_SECTION_FOREACH(k_stack, stack) {
SYS_TRACING_OBJ_INIT(k_stack, stack);
}
return 0;
}
SYS_INIT(init_stack_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
#endif /* CONFIG_OBJECT_TRACING */
void k_stack_init(struct k_stack *stack, stack_data_t *buffer,
u32_t num_entries)
{
z_waitq_init(&stack->wait_q);
stack->lock = (struct k_spinlock) {};
stack->next = stack->base = buffer;
stack->top = stack->base + num_entries;
SYS_TRACING_OBJ_INIT(k_stack, stack);
z_object_init(stack);
}
s32_t z_impl_k_stack_alloc_init(struct k_stack *stack, u32_t num_entries)
{
void *buffer;
s32_t ret;
buffer = z_thread_malloc(num_entries * sizeof(stack_data_t));
if (buffer != NULL) {
k_stack_init(stack, buffer, num_entries);
stack->flags = K_STACK_FLAG_ALLOC;
ret = (s32_t)0;
} else {
ret = -ENOMEM;
}
return ret;
}
#ifdef CONFIG_USERSPACE
static inline s32_t z_vrfy_k_stack_alloc_init(struct k_stack *stack,
u32_t num_entries)
{
Z_OOPS(Z_SYSCALL_OBJ_NEVER_INIT(stack, K_OBJ_STACK));
Z_OOPS(Z_SYSCALL_VERIFY(num_entries > 0));
return z_impl_k_stack_alloc_init(stack, num_entries);
}
#include <syscalls/k_stack_alloc_init_mrsh.c>
#endif
int k_stack_cleanup(struct k_stack *stack)
{
CHECKIF(z_waitq_head(&stack->wait_q) != NULL) {
return -EAGAIN;
}
if ((stack->flags & K_STACK_FLAG_ALLOC) != (u8_t)0) {
k_free(stack->base);
stack->base = NULL;
stack->flags &= ~K_STACK_FLAG_ALLOC;
}
return 0;
}
int z_impl_k_stack_push(struct k_stack *stack, stack_data_t data)
{
struct k_thread *first_pending_thread;
k_spinlock_key_t key;
CHECKIF(stack->next == stack->top) {
return -ENOMEM;
}
key = k_spin_lock(&stack->lock);
first_pending_thread = z_unpend_first_thread(&stack->wait_q);
if (first_pending_thread != NULL) {
z_ready_thread(first_pending_thread);
z_thread_return_value_set_with_data(first_pending_thread,
0, (void *)data);
z_reschedule(&stack->lock, key);
} else {
*(stack->next) = data;
stack->next++;
k_spin_unlock(&stack->lock, key);
}
return 0;
}
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_stack_push(struct k_stack *stack, stack_data_t data)
{
Z_OOPS(Z_SYSCALL_OBJ(stack, K_OBJ_STACK));
return z_impl_k_stack_push(stack, data);
}
#include <syscalls/k_stack_push_mrsh.c>
#endif
int z_impl_k_stack_pop(struct k_stack *stack, stack_data_t *data, s32_t timeout)
{
k_spinlock_key_t key;
int result;
key = k_spin_lock(&stack->lock);
if (likely(stack->next > stack->base)) {
stack->next--;
*data = *(stack->next);
k_spin_unlock(&stack->lock, key);
return 0;
}
if (timeout == K_NO_WAIT) {
k_spin_unlock(&stack->lock, key);
return -EBUSY;
}
result = z_pend_curr(&stack->lock, key, &stack->wait_q, timeout);
if (result == -EAGAIN) {
return -EAGAIN;
}
*data = (stack_data_t)_current->base.swap_data;
return 0;
}
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_stack_pop(struct k_stack *stack,
stack_data_t *data, s32_t timeout)
{
Z_OOPS(Z_SYSCALL_OBJ(stack, K_OBJ_STACK));
Z_OOPS(Z_SYSCALL_MEMORY_WRITE(data, sizeof(stack_data_t)));
return z_impl_k_stack_pop(stack, data, timeout);
}
#include <syscalls/k_stack_pop_mrsh.c>
#endif