102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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* Copyright (c) 2019 Intel corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <kernel_structs.h>
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#include <spinlock.h>
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#include <kswap.h>
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#include <syscall_handler.h>
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#include <init.h>
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#include <ksched.h>
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static struct z_futex_data *k_futex_find_data(struct k_futex *futex)
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{
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struct _k_object *obj;
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obj = z_object_find(futex);
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if (obj == NULL || obj->type != K_OBJ_FUTEX) {
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return NULL;
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}
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return (struct z_futex_data *)obj->data;
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}
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int z_impl_k_futex_wake(struct k_futex *futex, bool wake_all)
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{
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k_spinlock_key_t key;
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unsigned int woken = 0;
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struct k_thread *thread;
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struct z_futex_data *futex_data;
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futex_data = k_futex_find_data(futex);
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if (futex_data == NULL) {
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return -EINVAL;
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}
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key = k_spin_lock(&futex_data->lock);
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do {
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thread = z_unpend_first_thread(&futex_data->wait_q);
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if (thread) {
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z_ready_thread(thread);
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z_arch_thread_return_value_set(thread, 0);
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woken++;
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}
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} while (thread && wake_all);
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z_reschedule(&futex_data->lock, key);
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return woken;
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}
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static inline int z_vrfy_k_futex_wake(struct k_futex *futex, bool wake_all)
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{
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if (Z_SYSCALL_MEMORY_WRITE(futex, sizeof(struct k_futex)) != 0) {
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return -EACCES;
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}
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return z_impl_k_futex_wake(futex, wake_all);
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}
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#include <syscalls/k_futex_wake_mrsh.c>
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int z_impl_k_futex_wait(struct k_futex *futex, int expected, s32_t timeout)
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{
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int ret;
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k_spinlock_key_t key;
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struct z_futex_data *futex_data;
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futex_data = k_futex_find_data(futex);
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if (futex_data == NULL) {
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return -EINVAL;
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}
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key = k_spin_lock(&futex_data->lock);
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if (atomic_get(&futex->val) != (atomic_val_t)expected) {
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k_spin_unlock(&futex_data->lock, key);
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return -EAGAIN;
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}
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ret = z_pend_curr(&futex_data->lock,
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key, &futex_data->wait_q, timeout);
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if (ret == -EAGAIN) {
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ret = -ETIMEDOUT;
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}
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return ret;
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}
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static inline int z_vrfy_k_futex_wait(struct k_futex *futex, int expected,
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s32_t timeout)
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{
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if (Z_SYSCALL_MEMORY_WRITE(futex, sizeof(struct k_futex)) != 0) {
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return -EACCES;
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}
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return z_impl_k_futex_wait(futex, expected, timeout);
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}
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#include <syscalls/k_futex_wait_mrsh.c>
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