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/* Thread management routine header.
* Copyright (C) 1998 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ZEBRA_THREAD_H
#define _ZEBRA_THREAD_H
#include <zebra.h>
#include "monotime.h"
#include <pthread.h>
struct rusage_t
{
struct rusage cpu;
struct timeval real;
};
#define RUSAGE_T struct rusage_t
#define GETRUSAGE(X) thread_getrusage(X)
/* Linked list of thread. */
struct thread_list
{
struct thread *head;
struct thread *tail;
int count;
};
struct pqueue;
/*
* Abstract it so we can use different methodologies to
* select on data.
*/
typedef fd_set thread_fd_set;
#if defined(HAVE_POLL_CALL)
#include <poll.h>
struct fd_handler
{
/* number of pfd stored in pfds */
nfds_t pfdcount;
/* number of pfd stored in pfds + number of snmp pfd */
nfds_t pfdcountsnmp;
/* number of pfd that fit in the allocated space of pfds */
nfds_t pfdsize;
struct pollfd *pfds;
};
#else
struct fd_handler
{
fd_set readfd;
fd_set writefd;
fd_set exceptfd;
};
#endif
/* Master of the theads. */
struct thread_master
{
struct thread **read;
struct thread **write;
struct pqueue *timer;
struct thread_list event;
struct thread_list ready;
struct thread_list unuse;
struct pqueue *background;
int fd_limit;
struct fd_handler handler;
unsigned long alloc;
long selectpoll_timeout;
bool spin;
bool handle_signals;
pthread_mutex_t mtx;
};
typedef unsigned char thread_type;
/* Thread itself. */
struct thread
{
thread_type type; /* thread type */
thread_type add_type; /* thread type */
struct thread *next; /* next pointer of the thread */
struct thread *prev; /* previous pointer of the thread */
struct thread **ref; /* external reference (if given) */
struct thread_master *master; /* pointer to the struct thread_master */
int (*func) (struct thread *); /* event function */
void *arg; /* event argument */
union {
int val; /* second argument of the event. */
int fd; /* file descriptor in case of r/w */
struct timeval sands; /* rest of time sands value. */
} u;
int index; /* queue position for timers */
struct timeval real;
struct cpu_thread_history *hist; /* cache pointer to cpu_history */
unsigned long yield; /* yield time in microseconds */
const char *funcname; /* name of thread function */
const char *schedfrom; /* source file thread was scheduled from */
int schedfrom_line; /* line number of source file */
pthread_mutex_t mtx; /* mutex for thread.c functions */
};
struct cpu_thread_history
{
int (*func)(struct thread *);
unsigned int total_calls;
unsigned int total_active;
struct time_stats
{
unsigned long total, max;
} real;
struct time_stats cpu;
thread_type types;
const char *funcname;
};
/* Struct timeval's tv_usec one second value. */
#define TIMER_SECOND_MICRO 1000000L
/* Thread types. */
#define THREAD_READ 0
#define THREAD_WRITE 1
#define THREAD_TIMER 2
#define THREAD_EVENT 3
#define THREAD_READY 4
#define THREAD_BACKGROUND 5
#define THREAD_UNUSED 6
#define THREAD_EXECUTE 7
/* Thread yield time. */
#define THREAD_YIELD_TIME_SLOT 10 * 1000L /* 10ms */
/* Macros. */
#define THREAD_ARG(X) ((X)->arg)
#define THREAD_FD(X) ((X)->u.fd)
#define THREAD_VAL(X) ((X)->u.val)
#define THREAD_OFF(thread) \
do { \
if (thread) \
{ \
thread_cancel (thread); \
thread = NULL; \
} \
} while (0)
#define THREAD_READ_OFF(thread) THREAD_OFF(thread)
#define THREAD_WRITE_OFF(thread) THREAD_OFF(thread)
#define THREAD_TIMER_OFF(thread) THREAD_OFF(thread)
#define debugargdef const char *funcname, const char *schedfrom, int fromln
#define thread_add_read(m,f,a,v,t) funcname_thread_add_read_write(THREAD_READ,m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_add_write(m,f,a,v,t) funcname_thread_add_read_write(THREAD_WRITE,m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_add_timer(m,f,a,v,t) funcname_thread_add_timer(m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_add_timer_msec(m,f,a,v,t) funcname_thread_add_timer_msec(m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_add_timer_tv(m,f,a,v,t) funcname_thread_add_timer_tv(m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_add_event(m,f,a,v,t) funcname_thread_add_event(m,f,a,v,t,#f,__FILE__,__LINE__)
#define thread_execute(m,f,a,v) funcname_thread_execute(m,f,a,v,#f,__FILE__,__LINE__)
/* The 4th arg to thread_add_background is the # of milliseconds to delay. */
#define thread_add_background(m,f,a,v,t) funcname_thread_add_background(m,f,a,v,t,#f,__FILE__,__LINE__)
/* Prototypes. */
extern struct thread_master *thread_master_create (void);
extern void thread_master_free (struct thread_master *);
extern void thread_master_free_unused(struct thread_master *);
extern void funcname_thread_add_read_write (int dir, struct thread_master *,
int (*)(struct thread *), void *, int, struct thread **, debugargdef);
extern void funcname_thread_add_timer (struct thread_master *,
int (*)(struct thread *), void *, long, struct thread **, debugargdef);
extern void funcname_thread_add_timer_msec (struct thread_master *,
int (*)(struct thread *), void *, long, struct thread **, debugargdef);
extern void funcname_thread_add_timer_tv (struct thread_master *,
int (*)(struct thread *), void *, struct timeval *, struct thread **, debugargdef);
extern void funcname_thread_add_event (struct thread_master *,
int (*)(struct thread *), void *, int, struct thread **, debugargdef);
extern void funcname_thread_add_background (struct thread_master *,
int (*)(struct thread *), void *, long, struct thread **, debugargdef);
extern void funcname_thread_execute (struct thread_master *,
int (*)(struct thread *), void *, int, debugargdef);
#undef debugargdef
extern void thread_cancel (struct thread *);
extern unsigned int thread_cancel_event (struct thread_master *, void *);
extern struct thread *thread_fetch (struct thread_master *, struct thread *);
extern void thread_call (struct thread *);
extern unsigned long thread_timer_remain_second (struct thread *);
extern struct timeval thread_timer_remain(struct thread*);
extern int thread_should_yield (struct thread *);
/* set yield time for thread */
extern void thread_set_yield_time (struct thread *, unsigned long);
/* Internal libfrr exports */
extern void thread_getrusage (RUSAGE_T *);
extern void thread_cmd_init (void);
/* Returns elapsed real (wall clock) time. */
extern unsigned long thread_consumed_time(RUSAGE_T *after, RUSAGE_T *before,
unsigned long *cpu_time_elapsed);
/* only for use in logging functions! */
extern struct thread *thread_current;
#endif /* _ZEBRA_THREAD_H */
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