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Dropping the POSIX thread-local variables in favor of much easier-to-use C11 thread-local variables

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This commit is contained in:
Maria Matejka 2021-06-18 18:10:42 +02:00
parent b5061659d3
commit feb17ced23
3 changed files with 29 additions and 72 deletions
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47
lib/timer.c
View File

@ -43,38 +43,23 @@ struct timeloop main_timeloop;
#include <pthread.h>
/* Data accessed and modified from proto/bfd/io.c */
pthread_key_t current_time_key;
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);
}
_Thread_local struct timeloop *local_timeloop;
void wakeup_kick_current(void);
btime
current_time(void)
{
return timeloop_current()->last_time;
return local_timeloop->last_time;
}
btime
current_real_time(void)
{
struct timeloop *loop = timeloop_current();
if (!local_timeloop->real_time)
times_update_real_time(local_timeloop);
if (!loop->real_time)
times_update_real_time(loop);
return loop->real_time;
return local_timeloop->real_time;
}
@ -128,30 +113,29 @@ 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
}
@ -168,11 +152,10 @@ 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;
@ -230,7 +213,7 @@ void
timer_init(void)
{
timers_init(&main_timeloop, &root_pool);
timeloop_init_current();
local_timeloop = &main_timeloop;
}

1
lib/timer.h
View File

@ -42,6 +42,7 @@ 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);

53
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);
}
@ -195,15 +179,13 @@ events_fire(struct birdloop *loop)
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);
@ -392,11 +370,6 @@ 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;