xinyangli
2824efad33
NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/***************************************************************************************
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* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
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*
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* NEMU is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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*
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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*
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* See the Mulan PSL v2 for more details.
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***************************************************************************************/
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#include <common.h>
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#include <device/alarm.h>
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#include <sys/time.h>
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#include <signal.h>
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#define MAX_HANDLER 8
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static alarm_handler_t handler[MAX_HANDLER] = {};
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static int idx = 0;
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void add_alarm_handle(alarm_handler_t h) {
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assert(idx < MAX_HANDLER);
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handler[idx ++] = h;
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}
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static void alarm_sig_handler(int signum) {
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int i;
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for (i = 0; i < idx; i ++) {
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handler[i]();
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}
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}
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void init_alarm() {
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struct sigaction s;
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memset(&s, 0, sizeof(s));
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s.sa_handler = alarm_sig_handler;
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int ret = sigaction(SIGVTALRM, &s, NULL);
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Assert(ret == 0, "Can not set signal handler");
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struct itimerval it = {};
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it.it_value.tv_sec = 0;
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it.it_value.tv_usec = 1000000 / TIMER_HZ;
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it.it_interval = it.it_value;
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ret = setitimer(ITIMER_VIRTUAL, &it, NULL);
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Assert(ret == 0, "Can not set timer");
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}
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