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Converting the former BFD loop to a universal IO loop and protocol loop.

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There is a simple universal IO loop, taking care of events, timers and
sockets. Primarily, one instance of a protocol should use exactly one IO
loop to do all its work, as is now done in BFD.

Contrary to previous versions, the loop is now launched and cleaned by
the nest/proto.c code, allowing for a protocol to just request its own
loop by setting the loop's lock order in config higher than the_bird.

It is not supported nor checked if any protocol changed the requested
lock order in reconfigure. No protocol should do it at all.
This commit is contained in:
Maria Matejka
2021-06-19 20:50:18 +02:00
parent c84ed60371
commit 94eb0858c2
32 changed files with 783 additions and 445 deletions
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53
lib/timer.c
View File

@@ -37,15 +37,8 @@
#include "lib/resource.h"
#include "lib/timer.h"
struct timeloop main_timeloop;
#include <pthread.h>
/* Data accessed and modified from proto/bfd/io.c */
_Thread_local struct timeloop *local_timeloop;
_Atomic btime last_time;
_Atomic btime real_time;
@@ -76,7 +69,7 @@ tm_dump(resource *r)
if (t->recurrent)
debug("recur %d, ", t->recurrent);
if (t->expires)
debug("expires in %d ms)\n", (t->expires - current_time()) TO_MS);
debug("in loop %p expires in %d ms)\n", t->loop, (t->expires - current_time()) TO_MS);
else
debug("inactive)\n");
}
@@ -99,8 +92,8 @@ tm_new(pool *p)
return t;
}
void
tm_set(timer *t, btime when)
static void
tm_set_in_tl(timer *t, btime when, struct timeloop *local_timeloop)
{
uint tc = timers_count(local_timeloop);
@@ -122,17 +115,17 @@ tm_set(timer *t, btime when)
HEAP_DECREASE(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
}
#ifdef CONFIG_BFD
/* Hack to notify BFD loops */
if ((local_timeloop != &main_timeloop) && (t->index == 1))
wakeup_kick_current();
#endif
t->loop = local_timeloop;
if ((t->index == 1) && (local_timeloop->coro != this_coro))
birdloop_ping(local_timeloop->loop);
}
void
tm_start(timer *t, btime after)
tm_set_in(timer *t, btime when, struct birdloop *loop)
{
tm_set(t, current_time() + MAX(after, 0));
ASSERT_DIE(birdloop_inside(loop));
tm_set_in_tl(t, when, birdloop_time_loop(loop));
}
void
@@ -141,18 +134,23 @@ tm_stop(timer *t)
if (!t->expires)
return;
uint tc = timers_count(local_timeloop);
TLOCK_TIMER_ASSERT(t->loop);
HEAP_DELETE(local_timeloop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(local_timeloop->timers);
uint tc = timers_count(t->loop);
HEAP_DELETE(t->loop->timers.data, tc, timer *, TIMER_LESS, TIMER_SWAP, t->index);
BUFFER_POP(t->loop->timers);
t->index = -1;
t->expires = 0;
t->loop = NULL;
}
void
timers_init(struct timeloop *loop, pool *p)
{
TLOCK_TIMER_ASSERT(loop);
BUFFER_INIT(loop->timers, p, 4);
BUFFER_PUSH(loop->timers) = NULL;
}
@@ -160,8 +158,10 @@ timers_init(struct timeloop *loop, pool *p)
void io_log_event(void *hook, void *data);
void
timers_fire(struct timeloop *loop)
timers_fire(struct timeloop *loop, int io_log)
{
TLOCK_TIMER_ASSERT(loop);
btime base_time;
timer *t;
@@ -183,26 +183,19 @@ timers_fire(struct timeloop *loop)
if (t->randomize)
when += random() % (t->randomize + 1);
tm_set(t, when);
tm_set_in_tl(t, when, loop);
}
else
tm_stop(t);
/* This is ugly hack, we want to log just timers executed from the main I/O loop */
if (loop == &main_timeloop)
if (io_log)
io_log_event(t->hook, t->data);
t->hook(t);
}
}
void
timer_init(void)
{
timers_init(&main_timeloop, &root_pool);
local_timeloop = &main_timeloop;
}
/**
* tm_parse_time - parse a date and time