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#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "elasticarray.h"
#include "events.h"
#include "warnp.h"
#include "tsnetwork.h"
#include "tsnetwork_internal.h"
/* Sleepers. */
struct sleeper {
network_callback * callback;
void * cookie;
void * event_cookie;
};
ELASTICARRAY_DECL(SLEEPERS, sleepers, struct sleeper *);
static SLEEPERS sleepers = NULL;
/* Callback from network_sleep when timer expires. */
static int
callback_timer(void * cookie)
{
struct sleeper * sp = cookie;
/* This callback is no longer pending. */
sp->event_cookie = NULL;
/* Do callback. */
return ((sp->callback)(sp->cookie, NETWORK_STATUS_TIMEOUT));
}
/**
* network_sleep(timeo, callback, cookie):
* Register a callback to be performed by network_select once the specified
* timeout has expired. Return a handle which can be passed to
* network_desleep().
*/
int
network_sleep(struct timeval * timeo,
network_callback * callback, void * cookie)
{
struct sleeper s;
struct sleeper * sp = NULL; /* Silence bogus compiler warnings. */
size_t h;
/* Initialize array if required. */
if (sleepers == NULL) {
if ((sleepers = sleepers_init(0)) == NULL)
goto err0;
}
/* Construct sleeper record. */
s.callback = callback;
s.cookie = cookie;
s.event_cookie = NULL;
/* Search for empty space. */
for (h = 0; h < sleepers_getsize(sleepers); h++) {
sp = *sleepers_get(sleepers, h);
if (sp->event_cookie == NULL) {
/* Use this one. */
memcpy(sp, &s, sizeof(struct sleeper));
break;
}
}
/* If we didn't find an empty space, add a new sleeper. */
if (h == sleepers_getsize(sleepers)) {
/* Don't have too many sleepers... */
if (h == 1024) {
warn0("Too many sleepers");
goto err0;
}
/* Allocate a record. */
if ((sp = malloc(sizeof(struct sleeper))) == NULL)
goto err0;
/* Copy data in. */
memcpy(sp, &s, sizeof(struct sleeper));
/* Append the record. */
if (sleepers_append(sleepers, &sp, 1))
goto err1;
} else {
/*-
* If (h != sleepers_getsize()), then sp was set in the
* earlier 'for' loop, but compilers don't realize it.
*/
assert(sp != NULL);
}
/* Register the timer event. */
if ((sp->event_cookie =
events_timer_register(callback_timer, sp, timeo)) == NULL)
goto err0;
/* Success! */
return ((int)h);
err1:
free(sp);
err0:
/* Failure! */
return (-1);
}
/**
* network_desleep(handle):
* Deregister the callback associated with the provided handle. The
* callback will be called with a status of NETWORK_STATUS_CANCEL.
*/
int
network_desleep(int handle)
{
struct sleeper * sp;
/* Sanity-check the handle. */
if ((handle >= (int)sleepers_getsize(sleepers)) || (handle < 0)) {
warn0("Invalid sleeper handle: %d", handle);
goto err0;
}
/* Grab the relevant sleeper record. */
sp = *sleepers_get(sleepers, (size_t)handle);
/* If there is no timer, return silently. */
if (sp->event_cookie == NULL)
return (0);
/* Cancel the timer. */
events_timer_cancel(sp->event_cookie);
sp->event_cookie = NULL;
/* Invoke the callback. */
return ((sp->callback)(sp->cookie, NETWORK_STATUS_CANCEL));
err0:
/* Failure! */
return (-1);
}
/**
* network_sleep_fini(void):
* Free resources allocated.
*/
void
network_sleep_fini(void)
{
struct sleeper * sp;
size_t i;
/* Nothing to do if we're uninitialized. */
if (sleepers == NULL)
return;
/* Free records. */
for (i = 0; i < sleepers_getsize(sleepers); i++) {
sp = *sleepers_get(sleepers, i);
/* If this sleep is no longer in progress, free the record. */
if (sp->event_cookie == NULL)
free(sp);
}
/* Free the sleepers array. */
sleepers_free(sleepers);
}
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