720 lines
12 KiB
C
720 lines
12 KiB
C
/*
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* BIRD -- I/O and event loop
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <pthread.h>
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#include <time.h>
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#include <sys/time.h>
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#include "nest/bird.h"
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#include "proto/bfd/io.h"
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#include "lib/buffer.h"
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#include "lib/heap.h"
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#include "lib/lists.h"
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#include "lib/resource.h"
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#include "lib/event.h"
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#include "lib/socket.h"
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struct birdloop
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{
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pool *pool;
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pthread_t thread;
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pthread_mutex_t mutex;
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btime last_time;
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btime real_time;
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u8 use_monotonic_clock;
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u8 poll_active;
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u8 wakeup_masked;
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int wakeup_fds[2];
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BUFFER(timer2 *) timers;
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list event_list;
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list sock_list;
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uint sock_num;
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BUFFER(sock *) poll_sk;
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BUFFER(struct pollfd) poll_fd;
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u8 poll_changed;
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u8 close_scheduled;
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};
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static pthread_key_t current_loop_key;
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static inline struct birdloop *
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birdloop_current(void)
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{
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return pthread_getspecific(current_loop_key);
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}
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static inline void
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birdloop_set_current(struct birdloop *loop)
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{
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pthread_setspecific(current_loop_key, loop);
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}
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static inline void
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birdloop_init_current(void)
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{
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pthread_key_create(¤t_loop_key, NULL);
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}
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static void times_update_alt(struct birdloop *loop);
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static void
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times_init(struct birdloop *loop)
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{
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struct timespec ts;
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int rv;
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rv = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (rv < 0)
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{
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// log(L_WARN "Monotonic clock is missing");
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loop->use_monotonic_clock = 0;
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loop->last_time = 0;
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loop->real_time = 0;
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times_update_alt(loop);
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return;
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}
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/*
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if ((ts.tv_sec < 0) || (((s64) ts.tv_sec) > ((s64) 1 << 40)))
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log(L_WARN "Monotonic clock is crazy");
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*/
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loop->use_monotonic_clock = 1;
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loop->last_time = (ts.tv_sec S) + (ts.tv_nsec / 1000);
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loop->real_time = 0;
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}
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static void
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times_update_pri(struct birdloop *loop)
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{
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struct timespec ts;
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int rv;
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rv = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (rv < 0)
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die("clock_gettime: %m");
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btime new_time = (ts.tv_sec S) + (ts.tv_nsec / 1000);
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/*
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if (new_time < loop->last_time)
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log(L_ERR "Monotonic clock is broken");
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*/
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loop->last_time = new_time;
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loop->real_time = 0;
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}
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static void
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times_update_alt(struct birdloop *loop)
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{
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struct timeval tv;
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int rv;
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rv = gettimeofday(&tv, NULL);
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if (rv < 0)
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die("gettimeofday: %m");
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btime new_time = (tv.tv_sec S) + tv.tv_usec;
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btime delta = new_time - loop->real_time;
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if ((delta < 0) || (delta > (60 S)))
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{
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/*
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if (loop->real_time)
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log(L_WARN "Time jump, delta %d us", (int) delta);
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*/
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delta = 100 MS;
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}
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loop->last_time += delta;
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loop->real_time = new_time;
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}
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static void
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times_update(struct birdloop *loop)
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{
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if (loop->use_monotonic_clock)
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times_update_pri(loop);
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else
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times_update_alt(loop);
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}
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btime
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current_time(void)
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{
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return birdloop_current()->last_time;
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}
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static void
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pipe_new(int *pfds)
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{
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int rv = pipe(pfds);
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if (rv < 0)
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die("pipe: %m");
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if (fcntl(pfds[0], F_SETFL, O_NONBLOCK) < 0)
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die("fcntl(O_NONBLOCK): %m");
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if (fcntl(pfds[1], F_SETFL, O_NONBLOCK) < 0)
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die("fcntl(O_NONBLOCK): %m");
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}
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void
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pipe_drain(int fd)
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{
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char buf[64];
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int rv;
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try:
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rv = read(fd, buf, 64);
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if (rv < 0)
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{
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if (errno == EINTR)
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goto try;
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if (errno == EAGAIN)
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return;
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die("wakeup read: %m");
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}
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if (rv == 64)
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goto try;
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}
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void
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pipe_kick(int fd)
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{
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u64 v = 1;
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int rv;
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try:
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rv = write(fd, &v, sizeof(u64));
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if (rv < 0)
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{
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if (errno == EINTR)
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goto try;
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if (errno == EAGAIN)
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return;
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die("wakeup write: %m");
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}
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}
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static inline void
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wakeup_init(struct birdloop *loop)
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{
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pipe_new(loop->wakeup_fds);
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}
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static inline void
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wakeup_drain(struct birdloop *loop)
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{
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pipe_drain(loop->wakeup_fds[0]);
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}
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static inline void
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wakeup_do_kick(struct birdloop *loop)
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{
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pipe_kick(loop->wakeup_fds[1]);
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}
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static inline void
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wakeup_kick(struct birdloop *loop)
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{
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if (!loop->wakeup_masked)
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wakeup_do_kick(loop);
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else
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loop->wakeup_masked = 2;
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}
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static inline uint
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events_waiting(struct birdloop *loop)
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{
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return !EMPTY_LIST(loop->event_list);
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}
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static inline void
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events_init(struct birdloop *loop)
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{
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init_list(&loop->event_list);
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}
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static void
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events_fire(struct birdloop *loop)
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{
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times_update(loop);
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ev_run_list(&loop->event_list);
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}
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void
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ev2_schedule(event *e)
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{
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struct birdloop *loop = birdloop_current();
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if (loop->poll_active && EMPTY_LIST(loop->event_list))
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wakeup_kick(loop);
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if (e->n.next)
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rem_node(&e->n);
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add_tail(&loop->event_list, &e->n);
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}
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#define TIMER_LESS(a,b) ((a)->expires < (b)->expires)
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#define TIMER_SWAP(heap,a,b,t) (t = heap[a], heap[a] = heap[b], heap[b] = t, \
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heap[a]->index = (a), heap[b]->index = (b))
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static inline uint timers_count(struct birdloop *loop)
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{ return loop->timers.used - 1; }
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static inline timer2 *timers_first(struct birdloop *loop)
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{ return (loop->timers.used > 1) ? loop->timers.data[1] : NULL; }
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static void
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tm2_free(resource *r)
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{
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timer2 *t = (timer2 *) r;
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tm2_stop(t);
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}
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static void
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tm2_dump(resource *r)
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{
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timer2 *t = (timer2 *) r;
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debug("(code %p, data %p, ", t->hook, t->data);
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if (t->randomize)
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debug("rand %d, ", t->randomize);
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if (t->recurrent)
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debug("recur %d, ", t->recurrent);
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if (t->expires)
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debug("expires in %d ms)\n", (t->expires - current_time()) TO_MS);
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else
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debug("inactive)\n");
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}
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static struct resclass tm2_class = {
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"Timer",
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sizeof(timer2),
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tm2_free,
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tm2_dump,
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NULL,
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NULL
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};
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timer2 *
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tm2_new(pool *p)
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{
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timer2 *t = ralloc(p, &tm2_class);
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t->index = -1;
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return t;
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}
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void
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tm2_set(timer2 *t, btime when)
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{
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struct birdloop *loop = birdloop_current();
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uint tc = timers_count(loop);
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if (!t->expires)
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{
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t->index = ++tc;
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t->expires = when;
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BUFFER_PUSH(loop->timers) = t;
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HEAP_INSERT(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP);
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}
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else if (t->expires < when)
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{
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t->expires = when;
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HEAP_INCREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
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}
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else if (t->expires > when)
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{
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t->expires = when;
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HEAP_DECREASE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
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}
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if (loop->poll_active && (t->index == 1))
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wakeup_kick(loop);
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}
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void
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tm2_start(timer2 *t, btime after)
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{
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tm2_set(t, current_time() + MAX(after, 0));
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}
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void
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tm2_stop(timer2 *t)
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{
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if (!t->expires)
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return;
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struct birdloop *loop = birdloop_current();
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uint tc = timers_count(loop);
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HEAP_DELETE(loop->timers.data, tc, timer2 *, TIMER_LESS, TIMER_SWAP, t->index);
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BUFFER_POP(loop->timers);
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t->index = -1;
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t->expires = 0;
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}
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static void
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timers_init(struct birdloop *loop)
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{
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BUFFER_INIT(loop->timers, loop->pool, 4);
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BUFFER_PUSH(loop->timers) = NULL;
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}
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static void
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timers_fire(struct birdloop *loop)
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{
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btime base_time;
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timer2 *t;
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times_update(loop);
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base_time = loop->last_time;
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while (t = timers_first(loop))
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{
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if (t->expires > base_time)
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return;
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if (t->recurrent)
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{
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btime when = t->expires + t->recurrent;
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if (when <= loop->last_time)
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when = loop->last_time + t->recurrent;
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if (t->randomize)
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when += random() % (t->randomize + 1);
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tm2_set(t, when);
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}
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else
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tm2_stop(t);
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t->hook(t);
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}
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}
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static void
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sockets_init(struct birdloop *loop)
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{
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init_list(&loop->sock_list);
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loop->sock_num = 0;
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BUFFER_INIT(loop->poll_sk, loop->pool, 4);
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BUFFER_INIT(loop->poll_fd, loop->pool, 4);
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loop->poll_changed = 1; /* add wakeup fd */
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}
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static void
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sockets_add(struct birdloop *loop, sock *s)
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{
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add_tail(&loop->sock_list, &s->n);
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loop->sock_num++;
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s->index = -1;
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loop->poll_changed = 1;
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if (loop->poll_active)
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wakeup_kick(loop);
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}
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void
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sk_start(sock *s)
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{
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struct birdloop *loop = birdloop_current();
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sockets_add(loop, s);
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}
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static void
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sockets_remove(struct birdloop *loop, sock *s)
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{
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rem_node(&s->n);
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loop->sock_num--;
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if (s->index >= 0)
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loop->poll_sk.data[s->index] = NULL;
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s->index = -1;
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loop->poll_changed = 1;
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/* Wakeup moved to sk_stop() */
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}
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void
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sk_stop(sock *s)
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{
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struct birdloop *loop = birdloop_current();
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sockets_remove(loop, s);
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if (loop->poll_active)
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{
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loop->close_scheduled = 1;
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wakeup_kick(loop);
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}
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else
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close(s->fd);
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s->fd = -1;
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}
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static inline uint sk_want_events(sock *s)
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{ return (s->rx_hook ? POLLIN : 0) | ((s->ttx != s->tpos) ? POLLOUT : 0); }
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static void
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sockets_update(struct birdloop *loop, sock *s)
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{
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if (s->index >= 0)
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loop->poll_fd.data[s->index].events = sk_want_events(s);
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}
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static void
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sockets_prepare(struct birdloop *loop)
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{
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BUFFER_SET(loop->poll_sk, loop->sock_num + 1);
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BUFFER_SET(loop->poll_fd, loop->sock_num + 1);
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struct pollfd *pfd = loop->poll_fd.data;
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sock **psk = loop->poll_sk.data;
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int i = 0;
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node *n;
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WALK_LIST(n, loop->sock_list)
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{
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sock *s = SKIP_BACK(sock, n, n);
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ASSERT(i < loop->sock_num);
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s->index = i;
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*psk = s;
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pfd->fd = s->fd;
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pfd->events = sk_want_events(s);
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pfd->revents = 0;
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pfd++;
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psk++;
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i++;
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}
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ASSERT(i == loop->sock_num);
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/* Add internal wakeup fd */
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*psk = NULL;
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pfd->fd = loop->wakeup_fds[0];
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pfd->events = POLLIN;
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pfd->revents = 0;
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loop->poll_changed = 0;
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}
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static void
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sockets_close_fds(struct birdloop *loop)
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{
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struct pollfd *pfd = loop->poll_fd.data;
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sock **psk = loop->poll_sk.data;
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int poll_num = loop->poll_fd.used - 1;
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int i;
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for (i = 0; i < poll_num; i++)
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if (psk[i] == NULL)
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close(pfd[i].fd);
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loop->close_scheduled = 0;
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}
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int sk_read(sock *s);
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int sk_write(sock *s);
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static void
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sockets_fire(struct birdloop *loop)
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{
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struct pollfd *pfd = loop->poll_fd.data;
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sock **psk = loop->poll_sk.data;
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int poll_num = loop->poll_fd.used - 1;
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times_update(loop);
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/* Last fd is internal wakeup fd */
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if (pfd[loop->sock_num].revents & POLLIN)
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wakeup_drain(loop);
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int i;
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for (i = 0; i < poll_num; pfd++, psk++, i++)
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{
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int e = 1;
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if (! pfd->revents)
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continue;
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if (pfd->revents & POLLNVAL)
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die("poll: invalid fd %d", pfd->fd);
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if (pfd->revents & POLLIN)
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while (e && *psk && (*psk)->rx_hook)
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e = sk_read(*psk);
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e = 1;
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if (pfd->revents & POLLOUT)
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while (e && *psk)
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e = sk_write(*psk);
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}
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}
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static void * birdloop_main(void *arg);
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struct birdloop *
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birdloop_new(pool *p)
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{
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/* FIXME: this init should be elsewhere and thread-safe */
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static int init = 0;
|
|
if (!init)
|
|
{ birdloop_init_current(); init = 1; }
|
|
|
|
struct birdloop *loop = mb_allocz(p, sizeof(struct birdloop));
|
|
loop->pool = p;
|
|
pthread_mutex_init(&loop->mutex, NULL);
|
|
|
|
times_init(loop);
|
|
wakeup_init(loop);
|
|
|
|
events_init(loop);
|
|
timers_init(loop);
|
|
sockets_init(loop);
|
|
|
|
|
|
int rv = pthread_create(&loop->thread, NULL, birdloop_main, loop);
|
|
if (rv < 0)
|
|
die("pthread_create(): %m");
|
|
|
|
return loop;
|
|
}
|
|
|
|
void
|
|
birdloop_enter(struct birdloop *loop)
|
|
{
|
|
/* TODO: these functions could save and restore old context */
|
|
pthread_mutex_lock(&loop->mutex);
|
|
birdloop_set_current(loop);
|
|
}
|
|
|
|
void
|
|
birdloop_leave(struct birdloop *loop)
|
|
{
|
|
/* TODO: these functions could save and restore old context */
|
|
birdloop_set_current(NULL);
|
|
pthread_mutex_unlock(&loop->mutex);
|
|
}
|
|
|
|
void
|
|
birdloop_mask_wakeups(struct birdloop *loop)
|
|
{
|
|
pthread_mutex_lock(&loop->mutex);
|
|
loop->wakeup_masked = 1;
|
|
pthread_mutex_unlock(&loop->mutex);
|
|
}
|
|
|
|
void
|
|
birdloop_unmask_wakeups(struct birdloop *loop)
|
|
{
|
|
pthread_mutex_lock(&loop->mutex);
|
|
if (loop->wakeup_masked == 2)
|
|
wakeup_do_kick(loop);
|
|
loop->wakeup_masked = 0;
|
|
pthread_mutex_unlock(&loop->mutex);
|
|
}
|
|
|
|
static void *
|
|
birdloop_main(void *arg)
|
|
{
|
|
struct birdloop *loop = arg;
|
|
timer2 *t;
|
|
int rv, timeout;
|
|
|
|
birdloop_set_current(loop);
|
|
|
|
pthread_mutex_lock(&loop->mutex);
|
|
while (1)
|
|
{
|
|
events_fire(loop);
|
|
timers_fire(loop);
|
|
|
|
times_update(loop);
|
|
if (events_waiting(loop))
|
|
timeout = 0;
|
|
else if (t = timers_first(loop))
|
|
timeout = (tm2_remains(t) TO_MS) + 1;
|
|
else
|
|
timeout = -1;
|
|
|
|
if (loop->poll_changed)
|
|
sockets_prepare(loop);
|
|
|
|
loop->poll_active = 1;
|
|
pthread_mutex_unlock(&loop->mutex);
|
|
|
|
try:
|
|
rv = poll(loop->poll_fd.data, loop->poll_fd.used, timeout);
|
|
if (rv < 0)
|
|
{
|
|
if (errno == EINTR || errno == EAGAIN)
|
|
goto try;
|
|
die("poll: %m");
|
|
}
|
|
|
|
pthread_mutex_lock(&loop->mutex);
|
|
loop->poll_active = 0;
|
|
|
|
if (loop->close_scheduled)
|
|
sockets_close_fds(loop);
|
|
|
|
if (rv)
|
|
sockets_fire(loop);
|
|
|
|
timers_fire(loop);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|