M7350/bootable/bootloader/lk/kernel/dpc.c

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2024-09-09 08:52:07 +00:00
/*
* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <debug.h>
#include <list.h>
#include <malloc.h>
#include <err.h>
#include <kernel/dpc.h>
#include <kernel/thread.h>
#include <kernel/event.h>
struct dpc {
struct list_node node;
dpc_callback cb;
void *arg;
};
static struct list_node dpc_list = LIST_INITIAL_VALUE(dpc_list);
static event_t dpc_event;
static int dpc_thread_routine(void *arg);
void dpc_init(void)
{
event_init(&dpc_event, false, 0);
thread_resume(thread_create("dpc", &dpc_thread_routine, NULL, DPC_PRIORITY, DEFAULT_STACK_SIZE));
}
status_t dpc_queue(dpc_callback cb, void *arg, uint flags)
{
struct dpc *dpc;
dpc = malloc(sizeof(struct dpc));
dpc->cb = cb;
dpc->arg = arg;
enter_critical_section();
list_add_tail(&dpc_list, &dpc->node);
event_signal(&dpc_event, (flags & DPC_FLAG_NORESCHED) ? false : true);
exit_critical_section();
return NO_ERROR;
}
static int dpc_thread_routine(void *arg)
{
for (;;) {
event_wait(&dpc_event);
enter_critical_section();
struct dpc *dpc = list_remove_head_type(&dpc_list, struct dpc, node);
if (!dpc)
event_unsignal(&dpc_event);
exit_critical_section();
if (dpc) {
// dprintf("dpc calling %p, arg %p\n", dpc->cb, dpc->arg);
dpc->cb(dpc->arg);
free(dpc);
}
}
return 0;
}