99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include "peer.h"
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#include "rand.h"
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#include "wakeup.h"
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struct wakeup_entry {
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int fd;
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uint64_t absolute_time_ms;
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struct peer *peer;
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struct wakeup_entry *next;
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};
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struct wakeup_entry *head = NULL;
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static uint64_t wakeup_get_time_ms() {
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struct timespec tp;
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assert(!clock_gettime(CLOCK_MONOTONIC_COARSE, &tp));
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#define MS_PER_S 1000
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#define NS_PER_MS 1000000
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return (tp.tv_sec * MS_PER_S) + (tp.tv_nsec / NS_PER_MS);
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}
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void wakeup_init() {
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}
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void wakeup_cleanup() {
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while (head) {
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struct wakeup_entry *next = head->next;
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free(head);
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head = next;
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}
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}
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int wakeup_get_delay() {
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if (!head) {
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return -1;
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}
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int delay = head->absolute_time_ms - wakeup_get_time_ms();
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return delay < 0 ? 0 : delay;
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}
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void wakeup_dispatch() {
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uint64_t now = wakeup_get_time_ms();
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while (head && head->absolute_time_ms <= now) {
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struct peer *peer = head->peer;
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struct wakeup_entry *next = head->next;
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free(head);
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head = next;
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peer->event_handler(peer);
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}
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}
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void wakeup_add(struct peer *peer, uint32_t delay_ms) {
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struct wakeup_entry *entry = malloc(sizeof(*entry));
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entry->absolute_time_ms = wakeup_get_time_ms() + delay_ms;
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entry->peer = peer;
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struct wakeup_entry *prev = NULL, *iter = head;
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while (iter) {
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if (iter->absolute_time_ms > entry->absolute_time_ms) {
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break;
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}
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prev = iter;
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iter = iter->next;
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}
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if (prev) {
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entry->next = prev->next;
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prev->next = entry;
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} else {
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entry->next = head;
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head = entry;
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}
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}
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#define RETRY_MIN_MS 2000
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#define RETRY_MAX_MS 60000
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uint32_t wakeup_get_retry_delay_ms(uint32_t attempt) {
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uint32_t max_delay = RETRY_MIN_MS * (1 << attempt);
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max_delay = max_delay > RETRY_MAX_MS ? RETRY_MAX_MS : max_delay;
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uint32_t jitter;
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rand_fill(&jitter, sizeof(jitter));
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return jitter % max_delay;
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}
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