Remove timerfd from loop implementation

timerfd doesn't work on the BSDs, so this replaces it with a timespec
for the expiry and uses a poll timeout to check the timers when needed.
This commit is contained in:
Ryan Dwyer 2018-10-14 12:28:38 +10:00
parent f98f351a52
commit 6921fdc6d6
7 changed files with 128 additions and 65 deletions

View File

@ -1,18 +1,24 @@
#include <limits.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <poll.h>
#include <sys/timerfd.h>
#include <time.h>
#include <unistd.h>
#include "list.h"
#include "log.h"
#include "loop.h"
struct loop_event {
struct loop_fd_event {
void (*callback)(int fd, short mask, void *data);
void *data;
bool is_timer;
};
struct loop_timer {
void (*callback)(void *data);
void *data;
struct timespec expiry;
};
struct loop {
@ -20,7 +26,8 @@ struct loop {
int fd_length;
int fd_capacity;
list_t *events; // struct loop_event
list_t *fd_events; // struct loop_fd_event
list_t *timers; // struct loop_timer
};
struct loop *loop_create(void) {
@ -31,86 +38,136 @@ struct loop *loop_create(void) {
}
loop->fd_capacity = 10;
loop->fds = malloc(sizeof(struct pollfd) * loop->fd_capacity);
loop->events = create_list();
loop->fd_events = create_list();
loop->timers = create_list();
return loop;
}
void loop_destroy(struct loop *loop) {
list_foreach(loop->events, free);
list_free(loop->events);
list_foreach(loop->fd_events, free);
list_foreach(loop->timers, free);
list_free(loop->fd_events);
list_free(loop->timers);
free(loop);
}
void loop_poll(struct loop *loop) {
poll(loop->fds, loop->fd_length, -1);
// Calculate next timer in ms
int ms = INT_MAX;
if (loop->timers->length) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
for (int i = 0; i < loop->timers->length; ++i) {
struct loop_timer *timer = loop->timers->items[i];
int timer_ms = (timer->expiry.tv_sec - now.tv_sec) * 1000;
timer_ms += (timer->expiry.tv_nsec - now.tv_nsec) / 1000000;
if (timer_ms < ms) {
ms = timer_ms;
}
}
}
poll(loop->fds, loop->fd_length, ms);
// Dispatch fds
for (int i = 0; i < loop->fd_length; ++i) {
struct pollfd pfd = loop->fds[i];
struct loop_event *event = loop->events->items[i];
struct loop_fd_event *event = loop->fd_events->items[i];
// Always send these events
unsigned events = pfd.events | POLLHUP | POLLERR;
if (pfd.revents & events) {
event->callback(pfd.fd, pfd.revents, event->data);
}
}
if (event->is_timer) {
loop_remove_event(loop, event);
// Dispatch timers
if (loop->timers->length) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
for (int i = 0; i < loop->timers->length; ++i) {
struct loop_timer *timer = loop->timers->items[i];
bool expired = timer->expiry.tv_sec < now.tv_sec ||
(timer->expiry.tv_sec == now.tv_sec &&
timer->expiry.tv_nsec < now.tv_nsec);
if (expired) {
timer->callback(timer->data);
loop_remove_timer(loop, timer);
--i;
}
}
}
}
struct loop_event *loop_add_fd(struct loop *loop, int fd, short mask,
void loop_add_fd(struct loop *loop, int fd, short mask,
void (*callback)(int fd, short mask, void *data), void *data) {
struct loop_fd_event *event = calloc(1, sizeof(struct loop_fd_event));
if (!event) {
wlr_log(WLR_ERROR, "Unable to allocate memory for event");
return;
}
event->callback = callback;
event->data = data;
list_add(loop->fd_events, event);
struct pollfd pfd = {fd, mask, 0};
if (loop->fd_length == loop->fd_capacity) {
loop->fd_capacity += 10;
loop->fds = realloc(loop->fds, sizeof(struct pollfd) * loop->fd_capacity);
loop->fds = realloc(loop->fds,
sizeof(struct pollfd) * loop->fd_capacity);
}
loop->fds[loop->fd_length++] = pfd;
struct loop_event *event = calloc(1, sizeof(struct loop_event));
event->callback = callback;
event->data = data;
list_add(loop->events, event);
return event;
}
struct loop_event *loop_add_timer(struct loop *loop, int ms,
void (*callback)(int fd, short mask, void *data), void *data) {
int fd = timerfd_create(CLOCK_MONOTONIC, 0);
struct itimerspec its;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0;
its.it_value.tv_sec = ms / 1000;
its.it_value.tv_nsec = (ms % 1000) * 1000000;
timerfd_settime(fd, 0, &its, NULL);
struct loop_timer *loop_add_timer(struct loop *loop, int ms,
void (*callback)(void *data), void *data) {
struct loop_timer *timer = calloc(1, sizeof(struct loop_timer));
if (!timer) {
wlr_log(WLR_ERROR, "Unable to allocate memory for timer");
return NULL;
}
timer->callback = callback;
timer->data = data;
struct loop_event *event = loop_add_fd(loop, fd, POLLIN, callback, data);
event->is_timer = true;
clock_gettime(CLOCK_MONOTONIC, &timer->expiry);
timer->expiry.tv_sec += ms / 1000;
return event;
long int nsec = (ms % 1000) * 1000000;
if (timer->expiry.tv_nsec + nsec >= 1000000000) {
timer->expiry.tv_sec++;
nsec -= 1000000000;
}
timer->expiry.tv_nsec += nsec;
list_add(loop->timers, timer);
return timer;
}
bool loop_remove_event(struct loop *loop, struct loop_event *event) {
for (int i = 0; i < loop->events->length; ++i) {
if (loop->events->items[i] == event) {
list_del(loop->events, i);
if (event->is_timer) {
close(loop->fds[i].fd);
}
bool loop_remove_fd(struct loop *loop, int fd) {
for (int i = 0; i < loop->fd_length; ++i) {
if (loop->fds[i].fd == fd) {
free(loop->fd_events->items[i]);
list_del(loop->fd_events, i);
loop->fd_length--;
memmove(&loop->fds[i], &loop->fds[i + 1], sizeof(void*) * (loop->fd_length - i));
memmove(&loop->fds[i], &loop->fds[i + 1],
sizeof(void*) * (loop->fd_length - i));
free(event);
return true;
}
}
return false;
}
bool loop_remove_timer(struct loop *loop, struct loop_timer *timer) {
for (int i = 0; i < loop->timers->length; ++i) {
if (loop->timers->items[i] == timer) {
list_del(loop->timers, i);
free(timer);
return true;
}
}

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@ -5,12 +5,12 @@
/**
* This is an event loop system designed for sway clients, not sway itself.
*
* It uses pollfds to block on multiple file descriptors at once, and provides
* an easy way to set timers. Typically the Wayland display's fd will be one of
* the fds in the loop.
* The loop consists of file descriptors and timers. Typically the Wayland
* display's file descriptor will be one of the fds in the loop.
*/
struct loop;
struct loop_timer;
/**
* Create an event loop.
@ -28,20 +28,27 @@ void loop_destroy(struct loop *loop);
void loop_poll(struct loop *loop);
/**
* Add an fd to the loop.
* Add a file descriptor to the loop.
*/
struct loop_event *loop_add_fd(struct loop *loop, int fd, short mask,
void loop_add_fd(struct loop *loop, int fd, short mask,
void (*func)(int fd, short mask, void *data), void *data);
/**
* Add a timer to the loop.
*
* When the timer expires, the timer will be removed from the loop and freed.
*/
struct loop_event *loop_add_timer(struct loop *loop, int ms,
void (*callback)(int fd, short mask, void *data), void *data);
struct loop_timer *loop_add_timer(struct loop *loop, int ms,
void (*callback)(void *data), void *data);
/**
* Remove an event from the loop.
* Remove a file descriptor from the loop.
*/
bool loop_remove_event(struct loop *loop, struct loop_event *event);
bool loop_remove_fd(struct loop *loop, int fd);
/**
* Remove a timer from the loop.
*/
bool loop_remove_timer(struct loop *loop, struct loop_timer *timer);
#endif

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@ -69,7 +69,6 @@ struct swaybar {
struct status_line *status;
struct loop *eventloop;
struct loop_event *status_event;
int ipc_event_socketfd;
int ipc_socketfd;

View File

@ -55,9 +55,9 @@ struct swaylock_password {
struct swaylock_state {
struct loop *eventloop;
struct loop_event *clear_indicator_timer; // clears the indicator
struct loop_event *clear_password_timer; // clears the password buffer
struct loop_event *verify_password_timer;
struct loop_timer *clear_indicator_timer; // clears the indicator
struct loop_timer *clear_password_timer; // clears the password buffer
struct loop_timer *verify_password_timer;
struct wl_display *display;
struct wl_compositor *compositor;
struct zwlr_layer_shell_v1 *layer_shell;

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@ -647,7 +647,7 @@ static void status_in(int fd, short mask, void *data) {
if (mask & (POLLHUP | POLLERR)) {
status_error(bar->status, "[error reading from status command]");
set_bar_dirty(bar);
loop_remove_event(bar->eventloop, bar->status_event);
loop_remove_fd(bar->eventloop, fd);
} else if (status_handle_readable(bar->status)) {
set_bar_dirty(bar);
}
@ -658,8 +658,8 @@ void bar_run(struct swaybar *bar) {
display_in, bar);
loop_add_fd(bar->eventloop, bar->ipc_event_socketfd, POLLIN, ipc_in, bar);
if (bar->status) {
bar->status_event = loop_add_fd(
bar->eventloop, bar->status->read_fd, POLLIN, status_in, bar);
loop_add_fd(bar->eventloop, bar->status->read_fd, POLLIN,
status_in, bar);
}
while (1) {
wl_display_flush(bar->display);

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@ -16,7 +16,7 @@
static void status_line_close_fds(struct status_line *status) {
if (status->read_fd != -1) {
loop_remove_event(status->bar->eventloop, status->bar->status_event);
loop_remove_fd(status->bar->eventloop, status->read_fd);
close(status->read_fd);
status->read_fd = -1;
}

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@ -40,7 +40,7 @@ static void append_ch(struct swaylock_password *pw, uint32_t codepoint) {
pw->len += utf8_size;
}
static void clear_indicator(int fd, short mask, void *data) {
static void clear_indicator(void *data) {
struct swaylock_state *state = data;
state->clear_indicator_timer = NULL;
state->auth_state = AUTH_STATE_IDLE;
@ -49,13 +49,13 @@ static void clear_indicator(int fd, short mask, void *data) {
static void schedule_indicator_clear(struct swaylock_state *state) {
if (state->clear_indicator_timer) {
loop_remove_event(state->eventloop, state->clear_indicator_timer);
loop_remove_timer(state->eventloop, state->clear_indicator_timer);
}
state->clear_indicator_timer = loop_add_timer(
state->eventloop, 3000, clear_indicator, state);
}
static void clear_password(int fd, short mask, void *data) {
static void clear_password(void *data) {
struct swaylock_state *state = data;
state->clear_password_timer = NULL;
state->auth_state = AUTH_STATE_CLEAR;
@ -66,13 +66,13 @@ static void clear_password(int fd, short mask, void *data) {
static void schedule_password_clear(struct swaylock_state *state) {
if (state->clear_password_timer) {
loop_remove_event(state->eventloop, state->clear_password_timer);
loop_remove_timer(state->eventloop, state->clear_password_timer);
}
state->clear_password_timer = loop_add_timer(
state->eventloop, 10000, clear_password, state);
}
static void handle_preverify_timeout(int fd, short mask, void *data) {
static void handle_preverify_timeout(void *data) {
struct swaylock_state *state = data;
state->verify_password_timer = NULL;
}