90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file @brief task_offload_to_fiber() function for legacy applications
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*
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* For the legacy applications that need task_offload_to_fiber() function,
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* the moduel implements it by means of using work queue
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*/
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#include <kernel.h>
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#include <kernel_structs.h>
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#include <ksched.h>
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#include <init.h>
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struct offload_work {
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struct k_work work_item;
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int (*offload_func)();
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void *offload_args;
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struct k_thread *thread;
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};
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static struct k_work_q offload_work_q;
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/*
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* Internal handler of the offload requests
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*/
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static void offload_handler(struct k_work *work)
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{
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struct offload_work *offload =
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CONTAINER_OF(work, struct offload_work, work_item);
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int result = (offload->offload_func)(offload->offload_args);
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unsigned int key = irq_lock();
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offload->thread->base.swap_data = (void *)result;
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irq_unlock(key);
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}
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int task_offload_to_fiber(int (*func)(), void *argp)
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{
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/*
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* Create work in stack. Task is scheduled out and does not
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* return until the work is consumed and complete, so the
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* work item will exists until then.
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*/
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struct offload_work offload = {
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.offload_func = func,
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.offload_args = argp
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};
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__ASSERT(_is_preempt(_current), "Fiber is trying to offload work");
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k_work_init(&offload.work_item, offload_handler);
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offload.thread = _current;
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k_work_submit_to_queue(&offload_work_q, &offload.work_item);
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return (int)_current->base.swap_data;
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}
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static char __stack offload_work_q_stack[CONFIG_OFFLOAD_WORKQUEUE_STACK_SIZE];
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static int k_offload_work_q_init(struct device *dev)
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{
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ARG_UNUSED(dev);
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k_work_q_start(&offload_work_q,
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offload_work_q_stack,
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sizeof(offload_work_q_stack),
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CONFIG_OFFLOAD_WORKQUEUE_PRIORITY);
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return 0;
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}
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SYS_INIT(k_offload_work_q_init, POST_KERNEL,
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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