/* * POSIX.4 Timers * * Written by J. Vidal, F. Vazquez * 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 version 2. * */#include <rtl_sched.h>#include <linux/slab.h>#include <linux/time.h>#include <linux/signal.h>#ifdef CONFIG_OC_PTIMERS typedef struct rtl_sigevent{  int sigev_notify; /* notification mechanism */  int sigev_signo; /* signal number */}rtl_sigevent_t;struct rtl_itimerspec{  hrtime_t it_value;  hrtime_t it_interval;};/* POSIX.4 Timers struct definition*/ struct rtl_timer_struct {  int id;  clockid_t clock_id;  struct rtl_itimerspec expires;  pthread_t owner;   struct rtl_timer_struct *next;  rtl_sigevent_t signal;  int magic;};typedef struct rtl_timer_struct *timer_t;#define RTL_TIMER_MAGIC 0x19061977/* POSIX.4 Timers API.*/ /*  timer_create & timer_delete must be called from   init_module & clean_module respectivelly. *//* One-Shot and Repeating Timers */ int timer_create(clockid_t clock_id, const struct sigevent *signal_specification, timer_t *timer_id);int timer_delete(timer_t timer_id);int timer_settime(timer_t timer_id, int flags, const struct itimerspec *new_setting, struct itimerspec *old_setting);int timer_gettime(timer_t timer_id, struct itimerspec *ts_set);int timer_getoverrun(timer_t timer_id);/* Some usefull functions & macros */#define TIMER_ARMED(t)  ((t->expires.it_value)? 1 : 0)#define DISARME_TIMER(t) do {\    t->expires.it_value=0;\    t->expires.it_interval=0;\} while (0)#define PERIODIC_TIMER(t) ((t->expires.it_interval)? 1 : 0)  /*      CLOCK_REALTIME & CLOCK_RTL_SCHED are the same since rtlinux version 3.1      In mode ONESHOT, CLOCK_REALTIME & CLOCK_MONOTONIC are the same.     In periodic mode, CLOCK_MONOTONIC becomes local to the CPU.   */extern inline int timer_expiration(timer_t t,hrtime_t rtl_sched_clock_time, int mode){  hrtime_t now=rtl_sched_clock_time;  if (TIMER_ARMED(t)) {    if (t->clock_id == CLOCK_MONOTONIC && mode == RTL_CLOCK_MODE_PERIODIC){      now=clock_gethrtime(CLOCK_MONOTONIC);    }    return (now>=t->expires.it_value) ? 1 : 0;  }    return 0;  }#define CHECK_VALID_TIMER(timer) ((timer)->magic != RTL_TIMER_MAGIC)? 0:1// It is supposed to be a valid signal, so timer_create checks it.#define signal_generation(th,sig) do { if (sig) rtl_sigaddset(&th->pending,sig); } while(0)   /* notification mechanisms */extern inline void expiration_notification(timer_t t)   {  switch  (t->signal.sigev_notify){  case SIGEV_SIGNAL:     signal_generation(t->owner,t->signal.sigev_signo);     break;  default:    return ;  }} extern inline void UPDATE_TIMER(timer_t t){  /* Repeating timer ?*/  if (PERIODIC_TIMER(t)){    t->expires.it_value+=t->expires.it_interval;  } else {     /* One-shot timer */    DISARME_TIMER(t);  }}#define UPDATE_TIMER_IN_DEBUG_MODE(t) do {\  if (PERIODIC_TIMER(t)){\    t->expires.it_value+=t->expires.it_interval;\    rt_print_timer_request(events,t,FIFO);\  } else { DISARME_TIMER(t);}\} while(0)extern struct rtl_timer_struct *timer_list_start;extern spinlock_t rtl_timer_list_lock;#define get_timer_list_start() timer_list_start#define get_ptr_to_timer_list_start() &timer_list_start#endif