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eloop: allow edge-triggered operation

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A new EV_ET flag allows ev_fd sources to operate in edge-triggered instead
of level-triggered mode. See epoll(7) for more information.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2012-11-28 17:46:18 +01:00
parent e8c439c805
commit ae97bbf7e3
2 changed files with 8 additions and 1 deletions
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6
src/eloop.c
View File

@ -1144,6 +1144,8 @@ static int fd_epoll_add(struct ev_fd *fd)
ep.events |= EPOLLIN;
if (fd->mask & EV_WRITEABLE)
ep.events |= EPOLLOUT;
if (fd->mask & EV_ET)
ep.events |= EPOLLET;
ep.data.ptr = fd;
ret = epoll_ctl(fd->loop->efd, EPOLL_CTL_ADD, fd->fd, &ep);
@ -1182,6 +1184,8 @@ static int fd_epoll_update(struct ev_fd *fd)
ep.events |= EPOLLIN;
if (fd->mask & EV_WRITEABLE)
ep.events |= EPOLLOUT;
if (fd->mask & EV_ET)
ep.events |= EPOLLET;
ep.data.ptr = fd;
ret = epoll_ctl(fd->loop->efd, EPOLL_CTL_MOD, fd->fd, &ep);
@ -1297,7 +1301,7 @@ int ev_fd_update(struct ev_fd *fd, int mask)
if (!fd)
return -EINVAL;
if (fd->mask == mask)
if (fd->mask == mask && !(mask & EV_ET))
return 0;
omask = fd->mask;

3
src/eloop.h
View File

@ -129,17 +129,20 @@ typedef void (*ev_idle_cb) (struct ev_eloop *eloop, void *unused, void *data);
* @EV_WRITEABLE: file-desciprotr is writeable
* @EV_HUP: Hang-up on file-descriptor
* @EV_ERR: I/O error on file-descriptor
* @EV_ET: Edge-triggered mode
*
* These flags are used for events on file-descriptors. You can combine them
* with binary-operators like @EV_READABLE | @EV_WRITEABLE.
* @EV_HUP and @EV_ERR are always raised for file-descriptors, even if not
* requested explicitly.
* @EV_ET enables edge-triggered mode for the operation
*/
enum ev_eloop_flags {
EV_READABLE = 0x01,
EV_WRITEABLE = 0x02,
EV_HUP = 0x04,
EV_ERR = 0x08,
EV_ET = 0x10,
};
int ev_eloop_new(struct ev_eloop **out, ev_log_t log);