text: /* Copyright 2018 Canaan Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #include <stdio.h>
  #include "bsp.h"
  #include <unistd.h>
  #include "sysctl.h"
  
  corelock_t lock;
  
  uint64_t get_time(void)
  {
      uint64_t v_cycle = read_cycle();
      return v_cycle * 1000000 / sysctl_clock_get_freq(SYSCTL_CLOCK_CPU);
  }
  
  int core1_function(void *ctx)
  {
      uint64_t core = current_coreid();
      printf("Core %ld Hello world\n", core);
      while(1)
      {
          uint64_t start = get_time();
          corelock_lock(&lock);
          printf("Core %ld Hello world\n", core);
          sleep(1);
          corelock_unlock(&lock);
          uint64_t stop = get_time();
          printf("Core %ld lock time is %ld us\n",core, stop - start);
          usleep(10);
      }
  }
  
  int main(void)
  {
      uint64_t core = current_coreid();
      printf("Core %ld Hello world\n", core);
      register_core1(core1_function, NULL);
      while(1)
      {
          corelock_lock(&lock);
          sleep(1);
          printf("1> Core %ld sleep 1\n", core);
          corelock_lock(&lock);
          sleep(2);
          printf("2> Core %ld sleep 2\n", core);
          printf("2> Core unlock\n");
          corelock_unlock(&lock);
          sleep(1);
          printf("1> Core unlock\n");
          corelock_unlock(&lock);
          usleep(10);
      }
  }
  