/* * POSIX.1 Signals test program * * Written by J. Vidal * Copyright (C) Dec, 2002 OCERA Consortium. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2. * * Testing signal handlers preemption. * */#include <rtl.h>#include <pthread.h>#define SIGUSR1 RTL_SIGUSR1#define NTASKS 2static pthread_t thread[NTASKS];#define ITERS 100static int count=0;static void signal_handler(int signal){  int i,j,k,m=0;  rtl_printf("Signal handler called for signal %d, just wasting time\n",signal);  for (i=0;i<10;i++){    rtl_printf(" Signal handler computing m:%d\n",m);    for (j=0;j<ITERS;j++)      for (k=0;k<ITERS;k++)	m=i+k-j;      }  rtl_printf("Signal handler %d. Just before ending\n",signal);}static void *hight_prio_routine(void *arg){  struct sched_param p;  p.sched_priority=100;  pthread_setschedparam (pthread_self(), SCHED_FIFO, &p);  pthread_make_periodic_np(pthread_self(), gethrtime(), 100*1000LL);  pthread_kill(thread[0],SIGUSR1);  while (count++<ITERS){    rtl_printf("Interrumping signal handler execution -- iter: %d\n",count);    pthread_wait_np();  }   return 0;}static void *start_routine(void *arg){  struct sched_param p;  int param,err;  struct sigaction sa;  rtl_sigset_t mask;  param=(unsigned) arg;  p . sched_priority = param;  pthread_setschedparam (pthread_self(), SCHED_FIFO, &p);    sa.sa_handler=signal_handler;  sa.sa_mask=0;  sa.sa_flags=0;    if ((err=sigaction(SIGUSR1,&sa,NULL))<0 ){    rtl_printf("sigaction(SIGUSR1,&sa,NULL) FAILING, err:%d.\n",err);    pthread_exit(NULL);  }    rtl_sigfillset(&mask);  rtl_sigdelset(&mask,SIGUSR1);  sigsuspend(&mask);  rtl_printf("TEST SUCCED !!!!!!!!\n");  count=ITERS+1;  rtl_printf("terminating hight priority routine \n");  return 0;}int init_module(void) {  int i;  for (i=0;i<NTASKS-1;i++)    pthread_create (&thread[i], NULL, start_routine, (int *) i);  // This thread will interrupt lower priority thread signal handler execution.  pthread_create(&thread[NTASKS-1],NULL,hight_prio_routine,(void *)NULL);    return 0;}void cleanup_module(void) {  int i;  for (i=0;i<NTASKS;i++)    pthread_delete_np (thread[i]);}