lib/thread.h

   1 /* Thread management routine header.
   2  * Copyright (C) 1998 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _ZEBRA_THREAD_H
  22 #define _ZEBRA_THREAD_H
  23
  24 #include <zebra.h>
  25 #include <pthread.h>
  26 #include <poll.h>
  27 #include "monotime.h"
  28
  29 struct rusage_t {
  30         struct rusage cpu;
  31         struct timeval real;
  32 };
  33 #define RUSAGE_T        struct rusage_t
  34
  35 #define GETRUSAGE(X) thread_getrusage(X)
  36
  37 /* Linked list of thread. */
  38 struct thread_list {
  39         struct thread *head;
  40         struct thread *tail;
  41         int count;
  42 };
  43
  44 struct pqueue;
  45
  46 struct fd_handler {
  47         /* number of pfd that fit in the allocated space of pfds. This is a
  48          * constant
  49          * and is the same for both pfds and copy. */
  50         nfds_t pfdsize;
  51
  52         /* file descriptors to monitor for i/o */
  53         struct pollfd *pfds;
  54         /* number of pollfds stored in pfds */
  55         nfds_t pfdcount;
  56
  57         /* chunk used for temp copy of pollfds */
  58         struct pollfd *copy;
  59         /* number of pollfds stored in copy */
  60         nfds_t copycount;
  61 };
  62
  63 struct cancel_req {
  64         struct thread *thread;
  65         void *eventobj;
  66         struct thread **threadref;
  67 };
  68
  69 /* Master of the theads. */
  70 struct thread_master {
  71         char *name;
  72
  73         int tick_since_io;
  74         struct thread **read;
  75         struct thread **write;
  76         struct pqueue *timer;
  77         struct thread_list event;
  78         struct thread_list ready;
  79         struct thread_list unuse;
  80         struct list *cancel_req;
  81         bool canceled;
  82         pthread_cond_t cancel_cond;
  83         struct hash *cpu_record;
  84         int io_pipe[2];
  85         int fd_limit;
  86         struct fd_handler handler;
  87         unsigned long alloc;
  88         long selectpoll_timeout;
  89         bool spin;
  90         bool handle_signals;
  91         pthread_mutex_t mtx;
  92         pthread_t owner;
  93 };
  94
  95 typedef unsigned char thread_type;
  96
  97 /* Thread itself. */
  98 struct thread {
  99         thread_type type;            /* thread type */
 100         thread_type add_type;    /* thread type */
 101         struct thread *next;      /* next pointer of the thread */
 102         struct thread *prev;      /* previous pointer of the thread */
 103         struct thread **ref;      /* external reference (if given) */
 104         struct thread_master *master; /* pointer to the struct thread_master */
 105         int (*func)(struct thread *); /* event function */
 106         void *arg;                    /* event argument */
 107         union {
 108                 int val;              /* second argument of the event. */
 109                 int fd;               /* file descriptor in case of r/w */
 110                 struct timeval sands; /* rest of time sands value. */
 111         } u;
 112         int index; /* queue position for timers */
 113         struct timeval real;
 114         struct cpu_thread_history *hist; /* cache pointer to cpu_history */
 115         unsigned long yield;             /* yield time in microseconds */
 116         const char *funcname;            /* name of thread function */
 117         const char *schedfrom; /* source file thread was scheduled from */
 118         int schedfrom_line;    /* line number of source file */
 119         pthread_mutex_t mtx;   /* mutex for thread.c functions */
 120 };
 121
 122 struct cpu_thread_history {
 123         int (*func)(struct thread *);
 124         unsigned int total_calls;
 125         unsigned int total_active;
 126         struct time_stats {
 127                 unsigned long total, max;
 128         } real;
 129         struct time_stats cpu;
 130         thread_type types;
 131         const char *funcname;
 132 };
 133
 134 /* Struct timeval's tv_usec one second value.  */
 135 #define TIMER_SECOND_MICRO 1000000L
 136
 137 /* Thread types. */
 138 #define THREAD_READ           0
 139 #define THREAD_WRITE          1
 140 #define THREAD_TIMER          2
 141 #define THREAD_EVENT          3
 142 #define THREAD_READY          4
 143 #define THREAD_UNUSED         5
 144 #define THREAD_EXECUTE        6
 145
 146 /* Thread yield time.  */
 147 #define THREAD_YIELD_TIME_SLOT     10 * 1000L /* 10ms */
 148
 149 /* Macros. */
 150 #define THREAD_ARG(X) ((X)->arg)
 151 #define THREAD_FD(X)  ((X)->u.fd)
 152 #define THREAD_VAL(X) ((X)->u.val)
 153
 154 #define THREAD_OFF(thread)                                                     \
 155         do {                                                                   \
 156                 if (thread) {                                                  \
 157                         thread_cancel(thread);                                 \
 158                         thread = NULL;                                         \
 159                 }                                                              \
 160         } while (0)
 161
 162 #define THREAD_READ_OFF(thread)  THREAD_OFF(thread)
 163 #define THREAD_WRITE_OFF(thread)  THREAD_OFF(thread)
 164 #define THREAD_TIMER_OFF(thread)  THREAD_OFF(thread)
 165
 166 #define debugargdef  const char *funcname, const char *schedfrom, int fromln
 167
 168 #define thread_add_read(m,f,a,v,t) funcname_thread_add_read_write(THREAD_READ,m,f,a,v,t,#f,__FILE__,__LINE__)
 169 #define thread_add_write(m,f,a,v,t) funcname_thread_add_read_write(THREAD_WRITE,m,f,a,v,t,#f,__FILE__,__LINE__)
 170 #define thread_add_timer(m,f,a,v,t) funcname_thread_add_timer(m,f,a,v,t,#f,__FILE__,__LINE__)
 171 #define thread_add_timer_msec(m,f,a,v,t) funcname_thread_add_timer_msec(m,f,a,v,t,#f,__FILE__,__LINE__)
 172 #define thread_add_timer_tv(m,f,a,v,t) funcname_thread_add_timer_tv(m,f,a,v,t,#f,__FILE__,__LINE__)
 173 #define thread_add_event(m,f,a,v,t) funcname_thread_add_event(m,f,a,v,t,#f,__FILE__,__LINE__)
 174 #define thread_execute(m,f,a,v) funcname_thread_execute(m,f,a,v,#f,__FILE__,__LINE__)
 175
 176 /* Prototypes. */
 177 extern struct thread_master *thread_master_create(const char *);
 178 extern void thread_master_free(struct thread_master *);
 179 extern void thread_master_free_unused(struct thread_master *);
 180
 181 extern struct thread *
 182 funcname_thread_add_read_write(int dir, struct thread_master *,
 183                                int (*)(struct thread *), void *, int,
 184                                struct thread **, debugargdef);
 185
 186 extern struct thread *funcname_thread_add_timer(struct thread_master *,
 187                                                 int (*)(struct thread *),
 188                                                 void *, long, struct thread **,
 189                                                 debugargdef);
 190
 191 extern struct thread *
 192 funcname_thread_add_timer_msec(struct thread_master *, int (*)(struct thread *),
 193                                void *, long, struct thread **, debugargdef);
 194
 195 extern struct thread *funcname_thread_add_timer_tv(struct thread_master *,
 196                                                    int (*)(struct thread *),
 197                                                    void *, struct timeval *,
 198                                                    struct thread **,
 199                                                    debugargdef);
 200
 201 extern struct thread *funcname_thread_add_event(struct thread_master *,
 202                                                 int (*)(struct thread *),
 203                                                 void *, int, struct thread **,
 204                                                 debugargdef);
 205
 206 extern void funcname_thread_execute(struct thread_master *,
 207                                     int (*)(struct thread *), void *, int,
 208                                     debugargdef);
 209 #undef debugargdef
 210
 211 extern void thread_cancel(struct thread *);
 212 extern void thread_cancel_async(struct thread_master *, struct thread **,
 213                                 void *);
 214 extern void thread_cancel_event(struct thread_master *, void *);
 215 extern struct thread *thread_fetch(struct thread_master *, struct thread *);
 216 extern void thread_call(struct thread *);
 217 extern unsigned long thread_timer_remain_second(struct thread *);
 218 extern struct timeval thread_timer_remain(struct thread *);
 219 extern int thread_should_yield(struct thread *);
 220 /* set yield time for thread */
 221 extern void thread_set_yield_time(struct thread *, unsigned long);
 222
 223 /* Internal libfrr exports */
 224 extern void thread_getrusage(RUSAGE_T *);
 225 extern void thread_cmd_init(void);
 226
 227 /* Returns elapsed real (wall clock) time. */
 228 extern unsigned long thread_consumed_time(RUSAGE_T *after, RUSAGE_T *before,
 229                                           unsigned long *cpu_time_elapsed);
 230
 231 /* only for use in logging functions! */
 232 extern pthread_key_t thread_current;
 233
 234 #endif /* _ZEBRA_THREAD_H */