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Merge commit 'a4451535' into thread-next

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This commit is contained in:
Maria Matejka 2022-07-18 11:11:46 +02:00
commit 4b6f5ee870
15 changed files with 427 additions and 212 deletions
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14
aclocal.m4 vendored
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@ -1,5 +1,6 @@
dnl ** Additional Autoconf tests for BIRD configure script
dnl ** (c) 1999 Martin Mares <mj@ucw.cz>
dnl ** (c) 2021 Maria Matejka <mq@jmq.cz>
AC_DEFUN([BIRD_CHECK_POINTER_ALIGNMENT],
[
@ -35,14 +36,23 @@ AC_DEFUN([BIRD_CHECK_THREAD_LOCAL],
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[
_Thread_local static int x = 42;
static _Thread_local int x = 42;
],
[]
)
],
[bird_cv_thread_local=yes],
[AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[
static __thread int x = 42;
],
[]
)
],
[bird_cv_thread_local=__thread],
[bird_cv_thread_local=no]
)
)])
)
])

46
configure.ac
View File

@ -36,12 +36,6 @@ AC_ARG_ENABLE([memcheck],
[enable_memcheck=yes]
)
AC_ARG_ENABLE([pthreads],
[AS_HELP_STRING([--enable-pthreads], [enable POSIX threads support @<:@try@:>@])],
[],
[enable_pthreads=try]
)
AC_ARG_ENABLE([libssh],
[AS_HELP_STRING([--enable-libssh], [enable LibSSH support in RPKI @<:@try@:>@])],
[],
@ -125,25 +119,19 @@ if test -z "$GCC" ; then
fi
BIRD_CHECK_THREAD_LOCAL
if test "$bird_cv_thread_local" = yes ; then
AC_DEFINE([HAVE_THREAD_LOCAL], [1], [Define to 1 if _Thread_local is available])
if test "$bird_cv_thread_local" = no ; then
AC_MSG_ERROR([This program requires thread local storage.])
elif test "$bird_cv_thread_local" != yes ; then
AC_DEFINE_UNQUOTED([_Thread_local], [$bird_cv_thread_local], [Legacy _Thread_local])
fi
if test "$enable_pthreads" != no ; then
BIRD_CHECK_PTHREADS
BIRD_CHECK_PTHREADS
if test "$bird_cv_lib_pthreads" = yes ; then
AC_DEFINE([USE_PTHREADS], [1], [Define to 1 if pthreads are enabled])
CFLAGS="$CFLAGS -pthread"
LDFLAGS="$LDFLAGS -pthread"
proto_bfd=bfd
elif test "$enable_pthreads" = yes ; then
AC_MSG_ERROR([POSIX threads not available.])
fi
if test "$enable_pthreads" = try ; then
enable_pthreads="$bird_cv_lib_pthreads"
fi
if test "$bird_cv_lib_pthreads" = yes ; then
CFLAGS="$CFLAGS -pthread"
LDFLAGS="$LDFLAGS -pthread"
else
AC_MSG_ERROR([POSIX threads not available.])
fi
# This is assumed to be necessary for proper BIRD build
@ -304,8 +292,7 @@ if test "$enable_mpls_kernel" != no ; then
fi
fi
all_protocols="$proto_bfd babel bgp mrt ospf perf pipe radv rip rpki static"
all_protocols="bfd babel bgp mrt ospf perf pipe radv rip rpki static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'`
if test "$with_protocols" = all ; then
@ -351,9 +338,15 @@ case $sysdesc in
esac
AC_CHECK_HEADERS_ONCE([alloca.h syslog.h])
AC_CHECK_HEADER([sys/mman.h], [AC_DEFINE([HAVE_MMAP], [1], [Define to 1 if mmap() is available.])])
AC_CHECK_HEADER([sys/mman.h], [AC_DEFINE([HAVE_MMAP], [1], [Define to 1 if mmap() is available.])], have_mman=no)
AC_CHECK_FUNC([aligned_alloc], [AC_DEFINE([HAVE_ALIGNED_ALLOC], [1], [Define to 1 if aligned_alloc() is available.])], have_aligned_alloc=no)
AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [], [#include <sys/socket.h>])
if test "$have_aligned_alloc" = "no" && test "$have_mman" = "no" ; then
AC_MSG_ERROR([No means of aligned alloc found. Need mmap() or aligned_alloc().])
fi
AC_C_BIGENDIAN(
[AC_DEFINE([CPU_BIG_ENDIAN], [1], [Define to 1 if cpu is big endian])],
[AC_DEFINE([CPU_LITTLE_ENDIAN], [1], [Define to 1 if cpu is little endian])],
@ -409,7 +402,7 @@ if test "$enable_debug" = yes ; then
fi
fi
if test "enable_debug_expensive" = yes ; then
if test "$enable_debug_expensive" = yes ; then
AC_DEFINE([ENABLE_EXPENSIVE_CHECKS], [1], [Define to 1 if you want to run expensive consistency checks.])
fi
fi
@ -474,7 +467,6 @@ AC_MSG_RESULT([ Object directory: $objdir])
AC_MSG_RESULT([ Iproute2 directory: $iproutedir])
AC_MSG_RESULT([ System configuration: $sysdesc])
AC_MSG_RESULT([ Debugging: $enable_debug])
AC_MSG_RESULT([ POSIX threads: $enable_pthreads])
AC_MSG_RESULT([ Routing protocols: $protocols])
AC_MSG_RESULT([ LibSSH support in RPKI: $enable_libssh])
AC_MSG_RESULT([ Kernel MPLS support: $enable_mpls_kernel])

4
lib/birdlib.h
View File

@ -93,10 +93,6 @@ static inline int u64_cmp(u64 i1, u64 i2)
#define STATIC_ASSERT(EXP) _Static_assert(EXP, #EXP)
#define STATIC_ASSERT_MSG(EXP,MSG) _Static_assert(EXP, MSG)
#ifndef HAVE_THREAD_LOCAL
#define _Thread_local
#endif
/* Microsecond time */
typedef s64 btime;

26
lib/coro.h Normal file
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@ -0,0 +1,26 @@
/*
* BIRD Coroutines
*
* (c) 2017 Martin Mares <mj@ucw.cz>
* (c) 2020 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_CORO_H_
#define _BIRD_CORO_H_
#include "lib/resource.h"
/* A completely opaque coroutine handle. */
struct coroutine;
/* Coroutines are independent threads bound to pools.
* You request a coroutine by calling coro_run().
* It is forbidden to free a running coroutine from outside.
* The running coroutine must free itself by rfree() before returning.
*/
struct coroutine *coro_run(pool *, void (*entry)(void *), void *data);
#endif

2
lib/lists.c
View File

@ -26,7 +26,7 @@
#define _BIRD_LISTS_C_
#include "nest/bird.h"
#include "lib/birdlib.h"
#include "lib/lists.h"
LIST_INLINE int

44
lib/locking.h Normal file
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@ -0,0 +1,44 @@
/*
* BIRD Library -- Locking
*
* (c) 2020--2021 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_LOCKING_H_
#define _BIRD_LOCKING_H_
struct domain_generic;
/* Here define the global lock order; first to last. */
struct lock_order {
struct domain_generic *the_bird;
};
extern _Thread_local struct lock_order locking_stack;
extern _Thread_local struct domain_generic **last_locked;
#define DOMAIN(type) struct domain__##type
#define DEFINE_DOMAIN(type) DOMAIN(type) { struct domain_generic *type; }
#define DOMAIN_NEW(type, name) (DOMAIN(type)) { .type = domain_new(name, OFFSETOF(struct lock_order, type)) }
struct domain_generic *domain_new(const char *name, uint order);
#define DOMAIN_NULL(type) (DOMAIN(type)) {}
#define LOCK_DOMAIN(type, d) do_lock(((d).type), &(locking_stack.type))
#define UNLOCK_DOMAIN(type, d) do_unlock(((d).type), &(locking_stack.type))
/* Internal for locking */
void do_lock(struct domain_generic *dg, struct domain_generic **lsp);
void do_unlock(struct domain_generic *dg, struct domain_generic **lsp);
/* Use with care. To be removed in near future. */
DEFINE_DOMAIN(the_bird);
extern DOMAIN(the_bird) the_bird_domain;
#define the_bird_lock() LOCK_DOMAIN(the_bird, the_bird_domain)
#define the_bird_unlock() UNLOCK_DOMAIN(the_bird, the_bird_domain)
#endif

76
lib/timer.c
View File

@ -32,6 +32,7 @@
#include "nest/bird.h"
#include "lib/coro.h"
#include "lib/heap.h"
#include "lib/resource.h"
#include "lib/timer.h"
@ -40,53 +41,16 @@
struct timeloop main_timeloop;
#ifdef USE_PTHREADS
#include <pthread.h>
/* Data accessed and modified from proto/bfd/io.c */
pthread_key_t current_time_key;
_Thread_local struct timeloop *local_timeloop;
static inline struct timeloop *
timeloop_current(void)
{
return pthread_getspecific(current_time_key);
}
static inline void
timeloop_init_current(void)
{
pthread_key_create(&current_time_key, NULL);
pthread_setspecific(current_time_key, &main_timeloop);
}
_Atomic btime last_time;
_Atomic btime real_time;
void wakeup_kick_current(void);
#else
/* Just use main timelooop */
static inline struct timeloop * timeloop_current(void) { return &main_timeloop; }
static inline void timeloop_init_current(void) { }
#endif
btime
current_time(void)
{
return timeloop_current()->last_time;
}
btime
current_real_time(void)
{
struct timeloop *loop = timeloop_current();
if (!loop->real_time)
times_update_real_time(loop);
return loop->real_time;
}
#define TIMER_LESS(a,b) ((a)->expires < (b)->expires)
#define TIMER_SWAP(heap,a,b,t) (t = heap[a], heap[a] = heap[b], heap[b] = t, \
@ -138,30 +102,29 @@ tm_new(pool *p)
void
tm_set(timer *t, btime when)
{
struct timeloop *loop = timeloop_current();
uint tc = timers_count(loop);
uint tc = timers_count(local_timeloop);
if (!t->expires)
{
t->index = ++tc;
t->expires = when;
BUFFER_PUSH(loop->timers) = t;
HEAP_INSERT(loop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP);
BUFFER_PUSH(local_timeloop->timers) = t;
HEAP_INSERT(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP);
}
else if (t->expires < when)
{
t->expires = when;
HEAP_INCREASE(loop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
HEAP_INCREASE(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
}
else if (t->expires > when)
{
t->expires = when;
HEAP_DECREASE(loop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
HEAP_DECREASE(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
}
#ifdef CONFIG_BFD
/* Hack to notify BFD loops */
if ((loop != &main_timeloop) && (t->index == 1))
if ((local_timeloop != &main_timeloop) && (t->index == 1))
wakeup_kick_current();
#endif
}
@ -178,11 +141,10 @@ tm_stop(timer *t)
if (!t->expires)
return;
struct timeloop *loop = timeloop_current();
uint tc = timers_count(loop);
uint tc = timers_count(local_timeloop);
HEAP_DELETE(loop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(loop->timers);
HEAP_DELETE(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(local_timeloop->timers);
t->index = -1;
t->expires = 0;
@ -191,8 +153,6 @@ tm_stop(timer *t)
void
timers_init(struct timeloop *loop, pool *p)
{
times_init(loop);
BUFFER_INIT(loop->timers, p, 4);
BUFFER_PUSH(loop->timers) = NULL;
}
@ -205,8 +165,8 @@ timers_fire(struct timeloop *loop)
btime base_time;
timer *t;
times_update(loop);
base_time = loop->last_time;
times_update();
base_time = current_time();
while (t = timers_first(loop))
{
@ -217,8 +177,8 @@ timers_fire(struct timeloop *loop)
{
btime when = t->expires + t->recurrent;
if (when <= loop->last_time)
when = loop->last_time + t->recurrent;
if (when <= base_time)
when = base_time + t->recurrent;
if (t->randomize)
when += random() % (t->randomize + 1);
@ -241,7 +201,7 @@ void
timer_init(void)
{
timers_init(&main_timeloop, &root_pool);
timeloop_init_current();
local_timeloop = &main_timeloop;
}

15
lib/timer.h
View File

@ -14,6 +14,10 @@
#include "lib/buffer.h"
#include "lib/resource.h"
#include <stdatomic.h>
extern _Atomic btime last_time;
extern _Atomic btime real_time;
typedef struct timer
{
@ -31,8 +35,6 @@ typedef struct timer
struct timeloop
{
BUFFER_(timer *) timers;
btime last_time;
btime real_time;
};
static inline uint timers_count(struct timeloop *loop)
@ -42,9 +44,10 @@ static inline timer *timers_first(struct timeloop *loop)
{ return (loop->timers.used > 1) ? loop->timers.data[1] : NULL; }
extern struct timeloop main_timeloop;
extern _Thread_local struct timeloop *local_timeloop;
btime current_time(void);
btime current_real_time(void);
#define current_time() atomic_load_explicit(&last_time, memory_order_acquire)
#define current_real_time() atomic_load_explicit(&real_time, memory_order_acquire)
//#define now (current_time() TO_S)
//#define now_real (current_real_time() TO_S)
@ -94,9 +97,7 @@ tm_start_max(timer *t, btime after)
}
/* In sysdep code */
void times_init(struct timeloop *loop);
void times_update(struct timeloop *loop);
void times_update_real_time(struct timeloop *loop);
void times_update(void);
/* For I/O loop */
void timers_init(struct timeloop *loop, pool *p);

61
proto/bfd/io.c
View File

@ -52,29 +52,15 @@ struct birdloop
* Current thread context
*/
static pthread_key_t current_loop_key;
extern pthread_key_t current_time_key;
static inline struct birdloop *
birdloop_current(void)
{
return pthread_getspecific(current_loop_key);
}
static _Thread_local struct birdloop *birdloop_current;
static inline void
birdloop_set_current(struct birdloop *loop)
{
pthread_setspecific(current_loop_key, loop);
pthread_setspecific(current_time_key, loop ? &loop->time : &main_timeloop);
birdloop_current = loop;
local_timeloop = loop ? &loop->time : &main_timeloop;
}
static inline void
birdloop_init_current(void)
{
pthread_key_create(&current_loop_key, NULL);
}
/*
* Wakeup code for birdloop
*/
@ -162,10 +148,8 @@ wakeup_kick(struct birdloop *loop)
void
wakeup_kick_current(void)
{
struct birdloop *loop = birdloop_current();
if (loop && loop->poll_active)
wakeup_kick(loop);
if (birdloop_current && birdloop_current->poll_active)
wakeup_kick(birdloop_current);
}
@ -188,22 +172,20 @@ events_init(struct birdloop *loop)
static void
events_fire(struct birdloop *loop)
{
times_update(&loop->time);
times_update();
ev_run_list(&loop->event_list);
}
void
ev2_schedule(event *e)
{
struct birdloop *loop = birdloop_current();
if (loop->poll_active && EMPTY_LIST(loop->event_list))
wakeup_kick(loop);
if (birdloop_current->poll_active && EMPTY_LIST(birdloop_current->event_list))
wakeup_kick(birdloop_current);
if (e->n.next)
rem_node(&e->n);
add_tail(&loop->event_list, &e->n);
add_tail(&birdloop_current->event_list, &e->n);
}
@ -238,9 +220,7 @@ sockets_add(struct birdloop *loop, sock *s)
void
sk_start(sock *s)
{
struct birdloop *loop = birdloop_current();
sockets_add(loop, s);
sockets_add(birdloop_current, s);
}
static void
@ -261,14 +241,12 @@ sockets_remove(struct birdloop *loop, sock *s)
void
sk_stop(sock *s)
{
struct birdloop *loop = birdloop_current();
sockets_remove(birdloop_current, s);
sockets_remove(loop, s);
if (loop->poll_active)
if (birdloop_current->poll_active)
{
loop->close_scheduled = 1;
wakeup_kick(loop);
birdloop_current->close_scheduled = 1;
wakeup_kick(birdloop_current);
}
else
close(s->fd);
@ -354,7 +332,7 @@ sockets_fire(struct birdloop *loop)
sock **psk = loop->poll_sk.data;
int poll_num = loop->poll_fd.used - 1;
times_update(&loop->time);
times_update();
/* Last fd is internal wakeup fd */
if (pfd[poll_num].revents & POLLIN)
@ -387,16 +365,11 @@ sockets_fire(struct birdloop *loop)
* Birdloop
*/
static void * birdloop_main(void *arg);
static void *birdloop_main(void *arg);
struct birdloop *
birdloop_new(void)
{
/* FIXME: this init should be elsewhere and thread-safe */
static int init = 0;
if (!init)
{ birdloop_init_current(); init = 1; }
pool *p = rp_new(NULL, "Birdloop root");
struct birdloop *loop = mb_allocz(p, sizeof(struct birdloop));
loop->pool = p;
@ -490,7 +463,7 @@ birdloop_main(void *arg)
events_fire(loop);
timers_fire(&loop->time);
times_update(&loop->time);
times_update();
if (events_waiting(loop))
timeout = 0;
else if (t = timers_first(&loop->time))

2
sysdep/unix/Makefile
View File

@ -1,4 +1,4 @@
src := alloc.c io.c krt.c log.c main.c random.c
src := alloc.c io.c krt.c log.c main.c random.c coroutine.c
obj := $(src-o-files)
$(all-daemon)
$(cf-local)

179
sysdep/unix/coroutine.c Normal file
View File

@ -0,0 +1,179 @@
/*
* BIRD Coroutines
*
* (c) 2017 Martin Mares <mj@ucw.cz>
* (c) 2020 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#undef LOCAL_DEBUG
#undef DEBUG_LOCKING
#include "lib/birdlib.h"
#include "lib/locking.h"
#include "lib/coro.h"
#include "lib/resource.h"
#include "lib/timer.h"
/* Using a rather big stack for coroutines to allow for stack-local allocations.
* In real world, the kernel doesn't alloc this memory until it is used.
* */
#define CORO_STACK_SIZE 1048576
/*
* Implementation of coroutines based on POSIX threads
*/
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdatomic.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* Locking subsystem
*/
_Thread_local struct lock_order locking_stack = {};
_Thread_local struct domain_generic **last_locked = NULL;
#define ASSERT_NO_LOCK ASSERT_DIE(last_locked == NULL)
struct domain_generic {
pthread_mutex_t mutex;
uint order;
struct domain_generic **prev;
struct lock_order *locked_by;
const char *name;
};
#define DOMAIN_INIT(_name, _order) { .mutex = PTHREAD_MUTEX_INITIALIZER, .name = _name, .order = _order }
static struct domain_generic the_bird_domain_gen = DOMAIN_INIT("The BIRD", OFFSETOF(struct lock_order, the_bird));
DOMAIN(the_bird) the_bird_domain = { .the_bird = &the_bird_domain_gen };
struct domain_generic *
domain_new(const char *name, uint order)
{
ASSERT_DIE(order < sizeof(struct lock_order));
struct domain_generic *dg = xmalloc(sizeof(struct domain_generic));
*dg = (struct domain_generic) DOMAIN_INIT(name, order);
return dg;
}
void
domain_free(struct domain_generic *dg)
{
pthread_mutex_destroy(&dg->mutex);
xfree(dg);
}
void do_lock(struct domain_generic *dg, struct domain_generic **lsp)
{
if ((char *) lsp - (char *) &locking_stack != dg->order)
bug("Trying to lock on bad position: order=%u, lsp=%p, base=%p", dg->order, lsp, &locking_stack);
if (lsp <= last_locked)
bug("Trying to lock in a bad order");
if (*lsp)
bug("Inconsistent locking stack state on lock");
pthread_mutex_lock(&dg->mutex);
if (dg->prev || dg->locked_by)
bug("Previous unlock not finished correctly");
dg->prev = last_locked;
*lsp = dg;
last_locked = lsp;
dg->locked_by = &locking_stack;
}
void do_unlock(struct domain_generic *dg, struct domain_generic **lsp)
{
if ((char *) lsp - (char *) &locking_stack != dg->order)
bug("Trying to unlock on bad position: order=%u, lsp=%p, base=%p", dg->order, lsp, &locking_stack);
if (dg->locked_by != &locking_stack)
bug("Inconsistent domain state on unlock");
if ((last_locked != lsp) || (*lsp != dg))
bug("Inconsistent locking stack state on unlock");
dg->locked_by = NULL;
last_locked = dg->prev;
*lsp = NULL;
dg->prev = NULL;
pthread_mutex_unlock(&dg->mutex);
}
/* Coroutines */
struct coroutine {
resource r;
pthread_t id;
pthread_attr_t attr;
void (*entry)(void *);
void *data;
};
static _Thread_local _Bool coro_cleaned_up = 0;
static void coro_free(resource *r)
{
struct coroutine *c = (void *) r;
ASSERT_DIE(pthread_equal(pthread_self(), c->id));
pthread_attr_destroy(&c->attr);
coro_cleaned_up = 1;
}
static struct resclass coro_class = {
.name = "Coroutine",
.size = sizeof(struct coroutine),
.free = coro_free,
};
static void *coro_entry(void *p)
{
struct coroutine *c = p;
ASSERT_DIE(c->entry);
c->entry(c->data);
ASSERT_DIE(coro_cleaned_up);
return NULL;
}
struct coroutine *coro_run(pool *p, void (*entry)(void *), void *data)
{
ASSERT_DIE(entry);
ASSERT_DIE(p);
struct coroutine *c = ralloc(p, &coro_class);
c->entry = entry;
c->data = data;
int e = 0;
if (e = pthread_attr_init(&c->attr))
die("pthread_attr_init() failed: %M", e);
if (e = pthread_attr_setstacksize(&c->attr, CORO_STACK_SIZE))
die("pthread_attr_setstacksize(%u) failed: %M", CORO_STACK_SIZE, e);
if (e = pthread_attr_setdetachstate(&c->attr, PTHREAD_CREATE_DETACHED))
die("pthread_attr_setdetachstate(PTHREAD_CREATE_DETACHED) failed: %M", e);
if (e = pthread_create(&c->id, &c->attr, coro_entry, c))
die("pthread_create() failed: %M", e);
return c;
}

120
sysdep/unix/io.c
View File

@ -36,6 +36,7 @@
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/event.h"
#include "lib/locking.h"
#include "lib/timer.h"
#include "lib/string.h"
#include "nest/iface.h"
@ -122,55 +123,50 @@ rf_fileno(struct rfile *f)
btime boot_time;
void
times_init(struct timeloop *loop)
times_update(void)
{
struct timespec ts;
int rv;
btime old_time = current_time();
btime old_real_time = current_real_time();
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv < 0)
die("Monotonic clock is missing");
if ((ts.tv_sec < 0) || (((u64) ts.tv_sec) > ((u64) 1 << 40)))
log(L_WARN "Monotonic clock is crazy");
loop->last_time = ts.tv_sec S + ts.tv_nsec NS;
loop->real_time = 0;
}
void
times_update(struct timeloop *loop)
{
struct timespec ts;
int rv;
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv < 0)
die("clock_gettime: %m");
btime new_time = ts.tv_sec S + ts.tv_nsec NS;
if (new_time < loop->last_time)
if (new_time < old_time)
log(L_ERR "Monotonic clock is broken");
loop->last_time = new_time;
loop->real_time = 0;
}
void
times_update_real_time(struct timeloop *loop)
{
struct timespec ts;
int rv;
rv = clock_gettime(CLOCK_REALTIME, &ts);
if (rv < 0)
die("clock_gettime: %m");
loop->real_time = ts.tv_sec S + ts.tv_nsec NS;
}
btime new_real_time = ts.tv_sec S + ts.tv_nsec NS;
if (!atomic_compare_exchange_strong_explicit(
&last_time,
&old_time,
new_time,
memory_order_acq_rel,
memory_order_relaxed))
DBG("Time update collision: last_time");
if (!atomic_compare_exchange_strong_explicit(
&real_time,
&old_real_time,
new_real_time,
memory_order_acq_rel,
memory_order_relaxed))
DBG("Time update collision: real_time");
}
/**
* DOC: Sockets
@ -2037,30 +2033,17 @@ struct event_log_entry
static struct event_log_entry event_log[EVENT_LOG_LENGTH];
static struct event_log_entry *event_open;
static int event_log_pos, event_log_num, watchdog_active;
static btime last_time;
static btime last_io_time;
static btime loop_time;
static void
io_update_time(void)
{
struct timespec ts;
int rv;
/*
* This is third time-tracking procedure (after update_times() above and
* times_update() in BFD), dedicated to internal event log and latency
* tracking. Hopefully, we consolidate these sometimes.
*/
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv < 0)
die("clock_gettime: %m");
last_time = ts.tv_sec S + ts.tv_nsec NS;
last_io_time = current_time();
if (event_open)
{
event_open->duration = last_time - event_open->timestamp;
event_open->duration = last_io_time - event_open->timestamp;
if (event_open->duration > config->latency_limit)
log(L_WARN "Event 0x%p 0x%p took %u.%03u ms",
@ -2089,7 +2072,7 @@ io_log_event(void *hook, void *data)
en->hook = hook;
en->data = data;
en->timestamp = last_time;
en->timestamp = last_io_time;
en->duration = 0;
event_log_num++;
@ -2117,14 +2100,14 @@ io_log_dump(void)
struct event_log_entry *en = event_log + (event_log_pos + i) % EVENT_LOG_LENGTH;
if (en->hook)
log(L_DEBUG " Event 0x%p 0x%p at %8d for %d ms", en->hook, en->data,
(int) ((last_time - en->timestamp) TO_MS), (int) (en->duration TO_MS));
(int) ((last_io_time - en->timestamp) TO_MS), (int) (en->duration TO_MS));
}
}
void
watchdog_sigalrm(int sig UNUSED)
{
/* Update last_time and duration, but skip latency check */
/* Update last_io_time and duration, but skip latency check */
config->latency_limit = 0xffffffff;
io_update_time();
@ -2137,7 +2120,7 @@ watchdog_start1(void)
{
io_update_time();
loop_time = last_time;
loop_time = last_io_time;
}
static inline void
@ -2145,7 +2128,7 @@ watchdog_start(void)
{
io_update_time();
loop_time = last_time;
loop_time = last_io_time;
event_log_num = 0;
if (config->watchdog_timeout)
@ -2166,7 +2149,7 @@ watchdog_stop(void)
watchdog_active = 0;
}
btime duration = last_time - loop_time;
btime duration = last_io_time - loop_time;
if (duration > config->watchdog_warning)
log(L_WARN "I/O loop cycle took %u.%03u ms for %d events",
(uint) (duration TO_MS), (uint) (duration % 1000), event_log_num);
@ -2196,6 +2179,15 @@ static int short_loops = 0;
#define SHORT_LOOP_MAX 10
#define WORK_EVENTS_MAX 10
static int poll_reload_pipe[2];
void
io_loop_reload(void)
{
char b;
write(poll_reload_pipe[1], &b, 1);
}
void
io_loop(void)
{
@ -2207,10 +2199,13 @@ io_loop(void)
int fdmax = 256;
struct pollfd *pfd = xmalloc(fdmax * sizeof(struct pollfd));
if (pipe(poll_reload_pipe) < 0)
die("pipe(poll_reload_pipe) failed: %m");
watchdog_start1();
for(;;)
{
times_update(&main_timeloop);
times_update();
events = ev_run_list(&global_event_list);
events = ev_run_list_limited(&global_work_list, WORK_EVENTS_MAX) || events;
timers_fire(&main_timeloop);
@ -2220,12 +2215,17 @@ io_loop(void)
poll_tout = (events ? 0 : 3000); /* Time in milliseconds */
if (t = timers_first(&main_timeloop))
{
times_update(&main_timeloop);
times_update();
timeout = (tm_remains(t) TO_MS) + 1;
poll_tout = MIN(poll_tout, timeout);
}
nfds = 0;
/* A hack to reload main io_loop() when something has changed asynchronously. */
pfd[0].fd = poll_reload_pipe[0];
pfd[0].events = POLLIN;
nfds = 1;
WALK_LIST(n, sock_list)
{
pfd[nfds] = (struct pollfd) { .fd = -1 }; /* everything other set to 0 by this */
@ -2284,7 +2284,9 @@ io_loop(void)
/* And finally enter poll() to find active sockets */
watchdog_stop();
the_bird_unlock();
pout = poll(pfd, nfds, poll_tout);
the_bird_lock();
watchdog_start();
if (pout < 0)
@ -2295,7 +2297,15 @@ io_loop(void)
}
if (pout)
{
times_update(&main_timeloop);
if (pfd[0].revents & POLLIN)
{
/* IO loop reload requested */
char b;
read(poll_reload_pipe[0], &b, 1);
continue;
}
times_update();
/* guaranteed to be non-empty */
current_sock = SKIP_BACK(sock, n, HEAD(sock_list));

45
sysdep/unix/log.c
View File

@ -15,6 +15,7 @@
* user's manual.
*/
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
@ -35,8 +36,10 @@ static FILE *dbgf;
static list *current_log_list;
static char *current_syslog_name; /* NULL -> syslog closed */
static _Atomic uint max_coro_id = ATOMIC_VAR_INIT(1);
static _Thread_local uint this_coro_id;
#ifdef USE_PTHREADS
#define THIS_CORO_ID (this_coro_id ?: (this_coro_id = atomic_fetch_add_explicit(&max_coro_id, 1, memory_order_acq_rel)))
#include <pthread.h>
@ -48,15 +51,6 @@ static pthread_t main_thread;
void main_thread_init(void) { main_thread = pthread_self(); }
static int main_thread_self(void) { return pthread_equal(pthread_self(), main_thread); }
#else
static inline void log_lock(void) { }
static inline void log_unlock(void) { }
void main_thread_init(void) { }
static int main_thread_self(void) { return 1; }
#endif
#ifdef HAVE_SYSLOG_H
#include <sys/syslog.h>
@ -189,7 +183,7 @@ log_commit(int class, buffer *buf)
l->pos += msg_len;
}
fprintf(l->fh, "%s <%s> ", tbuf, class_names[class]);
fprintf(l->fh, "%s [%04x] <%s> ", tbuf, THIS_CORO_ID, class_names[class]);
}
fputs(buf->start, l->fh);
fputc('\n', l->fh);
@ -299,6 +293,8 @@ die(const char *msg, ...)
exit(1);
}
static struct timespec dbg_time_start;
/**
* debug - write to debug output
* @msg: a printf-like message
@ -311,12 +307,33 @@ debug(const char *msg, ...)
{
#define MAX_DEBUG_BUFSIZE 16384
va_list args;
char buf[MAX_DEBUG_BUFSIZE];
char buf[MAX_DEBUG_BUFSIZE], *pos = buf;
int max = MAX_DEBUG_BUFSIZE;
va_start(args, msg);
if (dbgf)
{
if (bvsnprintf(buf, MAX_DEBUG_BUFSIZE, msg, args) < 0)
struct timespec dbg_time;
clock_gettime(CLOCK_MONOTONIC, &dbg_time);
uint nsec;
uint sec;
if (dbg_time.tv_nsec > dbg_time_start.tv_nsec)
{
nsec = dbg_time.tv_nsec - dbg_time_start.tv_nsec;
sec = dbg_time.tv_sec - dbg_time_start.tv_sec;
}
else
{
nsec = 1000000000 + dbg_time.tv_nsec - dbg_time_start.tv_nsec;
sec = dbg_time.tv_sec - dbg_time_start.tv_sec - 1;
}
int n = bsnprintf(pos, max, "%u.%09u: [%04x] ", sec, nsec, THIS_CORO_ID);
pos += n;
max -= n;
if (bvsnprintf(pos, max, msg, args) < 0)
bug("Extremely long debug output, split it.");
fputs(buf, dbgf);
@ -422,6 +439,8 @@ done:
void
log_init_debug(char *f)
{
clock_gettime(CLOCK_MONOTONIC, &dbg_time_start);
if (dbgf && dbgf != stderr)
fclose(dbgf);
if (!f)

4
sysdep/unix/main.c
View File

@ -28,6 +28,7 @@
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/event.h"
#include "lib/locking.h"
#include "lib/timer.h"
#include "lib/string.h"
#include "nest/rt.h"
@ -873,6 +874,7 @@ main(int argc, char **argv)
dmalloc_debug(0x2f03d00);
#endif
times_update();
parse_args(argc, argv);
log_switch(1, NULL, NULL);
@ -927,6 +929,8 @@ main(int argc, char **argv)
dup2(0, 2);
}
the_bird_lock();
main_thread_init();
write_pid_file();

1
sysdep/unix/unix.h
View File

@ -106,6 +106,7 @@ extern volatile sig_atomic_t async_shutdown_flag;
void io_init(void);
void io_loop(void);
void io_loop_reload(void);
void io_log_dump(void);
int sk_open_unix(struct birdsock *s, char *name);
struct rfile *rf_open(struct pool *, const char *name, const char *mode);