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diff --git a/lib/thread.h b/lib/thread.h
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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 <pthread.h>
+#include <poll.h>
+#include "monotime.h"
+#include "frratomic.h"
+#include "typesafe.h"
+#include "xref.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern bool cputime_enabled;
+extern unsigned long cputime_threshold;
+/* capturing wallclock time is always enabled since it is fast (reading
+ * hardware TSC w/o syscalls)
+ */
+extern unsigned long walltime_threshold;
+
+struct rusage_t {
+#ifdef HAVE_CLOCK_THREAD_CPUTIME_ID
+ struct timespec cpu;
+#else
+ struct rusage cpu;
+#endif
+ struct timeval real;
+};
+#define RUSAGE_T struct rusage_t
+
+#define GETRUSAGE(X) thread_getrusage(X)
+
+PREDECL_LIST(thread_list);
+PREDECL_HEAP(thread_timer_list);
+
+struct fd_handler {
+ /* number of pfd that fit in the allocated space of pfds. This is a
+ * constant and is the same for both pfds and copy.
+ */
+ nfds_t pfdsize;
+
+ /* file descriptors to monitor for i/o */
+ struct pollfd *pfds;
+ /* number of pollfds stored in pfds */
+ nfds_t pfdcount;
+
+ /* chunk used for temp copy of pollfds */
+ struct pollfd *copy;
+ /* number of pollfds stored in copy */
+ nfds_t copycount;
+};
+
+struct xref_threadsched {
+ struct xref xref;
+
+ const char *funcname;
+ const char *dest;
+ uint32_t thread_type;
+};
+
+/* Master of the theads. */
+struct thread_master {
+ char *name;
+
+ struct thread **read;
+ struct thread **write;
+ struct thread_timer_list_head timer;
+ struct thread_list_head event, ready, unuse;
+ struct list *cancel_req;
+ bool canceled;
+ pthread_cond_t cancel_cond;
+ struct hash *cpu_record;
+ int io_pipe[2];
+ int fd_limit;
+ struct fd_handler handler;
+ unsigned long alloc;
+ long selectpoll_timeout;
+ bool spin;
+ bool handle_signals;
+ pthread_mutex_t mtx;
+ pthread_t owner;
+
+ bool ready_run_loop;
+ RUSAGE_T last_getrusage;
+};
+
+/* Thread itself. */
+struct thread {
+ uint8_t type; /* thread type */
+ uint8_t add_type; /* thread type */
+ struct thread_list_item threaditem;
+ struct thread_timer_list_item timeritem;
+ struct thread **ref; /* external reference (if given) */
+ struct thread_master *master; /* pointer to the struct thread_master */
+ void (*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;
+ struct timeval real;
+ struct cpu_thread_history *hist; /* cache pointer to cpu_history */
+ unsigned long yield; /* yield time in microseconds */
+ const struct xref_threadsched *xref; /* origin location */
+ pthread_mutex_t mtx; /* mutex for thread.c functions */
+ bool ignore_timer_late;
+};
+
+#ifdef _FRR_ATTRIBUTE_PRINTFRR
+#pragma FRR printfrr_ext "%pTH" (struct thread *)
+#endif
+
+struct cpu_thread_history {
+ void (*func)(struct thread *);
+ atomic_size_t total_cpu_warn;
+ atomic_size_t total_wall_warn;
+ atomic_size_t total_starv_warn;
+ atomic_size_t total_calls;
+ atomic_size_t total_active;
+ struct time_stats {
+ atomic_size_t total, max;
+ } real;
+ struct time_stats cpu;
+ atomic_uint_fast32_t 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_UNUSED 5
+#define THREAD_EXECUTE 6
+
+/* Thread yield time. */
+#define THREAD_YIELD_TIME_SLOT 10 * 1000L /* 10ms */
+
+#define THREAD_TIMER_STRLEN 12
+
+/* Macros. */
+#define THREAD_ARG(X) ((X)->arg)
+#define THREAD_FD(X) ((X)->u.fd)
+#define THREAD_VAL(X) ((X)->u.val)
+
+/*
+ * Please consider this macro deprecated, and do not use it in new code.
+ */
+#define THREAD_OFF(thread) \
+ do { \
+ if ((thread)) \
+ thread_cancel(&(thread)); \
+ } while (0)
+
+/*
+ * Macro wrappers to generate xrefs for all thread add calls. Includes
+ * file/line/function info for debugging/tracing.
+ */
+#include "lib/xref.h"
+
+#define _xref_t_a(addfn, type, m, f, a, v, t) \
+ ({ \
+ static const struct xref_threadsched _xref \
+ __attribute__((used)) = { \
+ .xref = XREF_INIT(XREFT_THREADSCHED, NULL, __func__), \
+ .funcname = #f, \
+ .dest = #t, \
+ .thread_type = THREAD_ ## type, \
+ }; \
+ XREF_LINK(_xref.xref); \
+ _thread_add_ ## addfn(&_xref, m, f, a, v, t); \
+ }) \
+ /* end */
+
+#define thread_add_read(m,f,a,v,t) _xref_t_a(read_write, READ, m,f,a,v,t)
+#define thread_add_write(m,f,a,v,t) _xref_t_a(read_write, WRITE, m,f,a,v,t)
+#define thread_add_timer(m,f,a,v,t) _xref_t_a(timer, TIMER, m,f,a,v,t)
+#define thread_add_timer_msec(m,f,a,v,t) _xref_t_a(timer_msec, TIMER, m,f,a,v,t)
+#define thread_add_timer_tv(m,f,a,v,t) _xref_t_a(timer_tv, TIMER, m,f,a,v,t)
+#define thread_add_event(m,f,a,v,t) _xref_t_a(event, EVENT, m,f,a,v,t)
+
+#define thread_execute(m,f,a,v) \
+ ({ \
+ static const struct xref_threadsched _xref \
+ __attribute__((used)) = { \
+ .xref = XREF_INIT(XREFT_THREADSCHED, NULL, __func__), \
+ .funcname = #f, \
+ .dest = NULL, \
+ .thread_type = THREAD_EXECUTE, \
+ }; \
+ XREF_LINK(_xref.xref); \
+ _thread_execute(&_xref, m, f, a, v); \
+ }) /* end */
+
+/* Prototypes. */
+extern struct thread_master *thread_master_create(const char *);
+void thread_master_set_name(struct thread_master *master, const char *name);
+extern void thread_master_free(struct thread_master *);
+extern void thread_master_free_unused(struct thread_master *);
+
+extern void _thread_add_read_write(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg,
+ int fd, struct thread **tref);
+
+extern void _thread_add_timer(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg, long t,
+ struct thread **tref);
+
+extern void _thread_add_timer_msec(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg,
+ long t, struct thread **tref);
+
+extern void _thread_add_timer_tv(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg,
+ struct timeval *tv, struct thread **tref);
+
+extern void _thread_add_event(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg, int val,
+ struct thread **tref);
+
+extern void _thread_execute(const struct xref_threadsched *xref,
+ struct thread_master *master,
+ void (*fn)(struct thread *), void *arg, int val);
+
+extern void thread_cancel(struct thread **event);
+extern void thread_cancel_async(struct thread_master *, struct thread **,
+ void *);
+/* Cancel ready tasks with an arg matching 'arg' */
+extern void thread_cancel_event_ready(struct thread_master *m, void *arg);
+/* Cancel all tasks with an arg matching 'arg', including timers and io */
+extern void thread_cancel_event(struct thread_master *m, void *arg);
+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 unsigned long thread_timer_remain_msec(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 pthread_key_t thread_current;
+extern char *thread_timer_to_hhmmss(char *buf, int buf_size,
+ struct thread *t_timer);
+
+static inline bool thread_is_scheduled(struct thread *thread)
+{
+ if (thread)
+ return true;
+
+ return false;
+}
+
+/* Debug signal mask */
+void debug_signals(const sigset_t *sigs);
+
+static inline void thread_ignore_late_timer(struct thread *thread)
+{
+ thread->ignore_timer_late = true;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ZEBRA_THREAD_H */
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