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