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fdm: add support for hooks

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Hooks are functions executed just before going into a poll(). Or just
after executing all FD handlers, if you like.
This commit is contained in:
Daniel Eklöf 2020-01-04 19:48:15 +01:00
parent 14d897ac75
commit a3c18e72f5
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GPG key ID: 5BBD4992C116573F
2 changed files with 53 additions and 0 deletions
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49
fdm.c
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@ -21,11 +21,17 @@ struct handler {
bool deleted;
};
struct hook {
fdm_hook_t callback;
void *callback_data;
};
struct fdm {
int epoll_fd;
bool is_polling;
tll(struct handler *) fds;
tll(struct handler *) deferred_delete;
tll(struct hook) hooks;
};
struct fdm *
@ -43,6 +49,7 @@ fdm_init(void)
.is_polling = false,
.fds = tll_init(),
.deferred_delete = tll_init(),
.hooks = tll_init(),
};
return fdm;
}
@ -56,11 +63,16 @@ fdm_destroy(struct fdm *fdm)
if (tll_length(fdm->fds) > 0)
LOG_WARN("FD list not empty");
if (tll_length(fdm->hooks) > 0)
LOG_WARN("hook list not empty");
assert(tll_length(fdm->fds) == 0);
assert(tll_length(fdm->deferred_delete) == 0);
assert(tll_length(fdm->hooks) == 0);
tll_free(fdm->fds);
tll_free(fdm->deferred_delete);
tll_free(fdm->hooks);
close(fdm->epoll_fd);
free(fdm);
}
@ -195,6 +207,37 @@ fdm_event_del(struct fdm *fdm, int fd, int events)
return false;
}
bool
fdm_hook_add(struct fdm *fdm, fdm_hook_t hook, void *data)
{
#if defined(_DEBUG)
tll_foreach(fdm->hooks, it) {
if (it->item.callback == hook) {
LOG_ERR("hook=%p already registered", hook);
return false;
}
}
#endif
tll_push_back(fdm->hooks, ((struct hook){hook, data}));
return true;
}
bool
fdm_hook_del(struct fdm *fdm, fdm_hook_t hook)
{
tll_foreach(fdm->hooks, it) {
if (it->item.callback != hook)
continue;
tll_remove(fdm->hooks, it);
return true;
}
LOG_WARN("hook=%p not registered, hook", hook);
return false;
}
bool
fdm_poll(struct fdm *fdm)
{
@ -204,6 +247,12 @@ fdm_poll(struct fdm *fdm)
return false;
}
tll_foreach(fdm->hooks, it) {
LOG_DBG("executing hook %p(fdm=%p, data=%p)",
it->item.callback, fdm, it->item.callback_data);
it->item.callback(fdm, it->item.callback_data);
}
struct epoll_event events[tll_length(fdm->fds)];
int r = epoll_wait(fdm->epoll_fd, events, tll_length(fdm->fds), -1);