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/*
Unix SMB/CIFS implementation.
Implement a barrier
Copyright (C) Volker Lendecke 2012
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "tevent_barrier.h"
#include "lib/util/tevent_unix.h"
struct tevent_barrier_waiter {
struct tevent_immediate *im;
struct tevent_context *ev;
struct tevent_req *req;
};
struct tevent_barrier {
unsigned count;
struct tevent_barrier_waiter *waiters;
void (*trigger_cb)(void *private_data);
void *private_data;
};
static int tevent_barrier_destructor(struct tevent_barrier *b);
static void tevent_barrier_release(struct tevent_barrier *b);
static void tevent_barrier_release_one(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data);
static void tevent_barrier_release_trigger(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data);
struct tevent_barrier *tevent_barrier_init(
TALLOC_CTX *mem_ctx, unsigned count,
void (*trigger_cb)(void *private_data), void *private_data)
{
struct tevent_barrier *b;
unsigned i;
if (count == 0) {
return NULL;
}
b = talloc(mem_ctx, struct tevent_barrier);
if (b == NULL) {
return NULL;
}
b->count = 0;
b->trigger_cb = trigger_cb;
b->private_data = private_data;
b->waiters = talloc_array(b, struct tevent_barrier_waiter, count);
if (b->waiters == NULL) {
goto fail;
}
for (i=0; i<count; i++) {
struct tevent_barrier_waiter *w = &b->waiters[i];
w->im = tevent_create_immediate(b->waiters);
if (w->im == NULL) {
goto fail;
}
w->req = NULL;
}
talloc_set_destructor(b, tevent_barrier_destructor);
return b;
fail:
TALLOC_FREE(b);
return NULL;
}
static int tevent_barrier_destructor(struct tevent_barrier *b)
{
tevent_barrier_release(b);
return 0;
}
struct tevent_barrier_wait_state {
struct tevent_barrier *b;
int index;
};
static void tevent_barrier_release(struct tevent_barrier *b)
{
unsigned i;
for (i=0; i<b->count; i++) {
struct tevent_barrier_waiter *w = &b->waiters[i];
struct tevent_barrier_wait_state *state;
if (w->req == NULL) {
continue;
}
tevent_schedule_immediate(
w->im, w->ev, tevent_barrier_release_one, w->req);
state = tevent_req_data(
w->req, struct tevent_barrier_wait_state);
talloc_set_destructor(state, NULL);
w->req = NULL;
w->ev = NULL;
}
b->count = 0;
if (b->trigger_cb != NULL) {
b->trigger_cb(b->private_data);
}
}
static void tevent_barrier_release_one(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
tevent_req_done(req);
}
static int tevent_barrier_wait_state_destructor(
struct tevent_barrier_wait_state *s);
struct tevent_req *tevent_barrier_wait_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tevent_barrier *b)
{
struct tevent_req *req;
struct tevent_barrier_wait_state *state;
struct tevent_barrier_waiter *w;
struct tevent_immediate *im;
req = tevent_req_create(mem_ctx, &state,
struct tevent_barrier_wait_state);
if (req == NULL) {
return NULL;
}
state->b = b;
state->index = b->count;
w = &b->waiters[b->count];
w->ev = ev;
w->req = req;
b->count += 1;
talloc_set_destructor(state, tevent_barrier_wait_state_destructor);
if (b->count < talloc_array_length(b->waiters)) {
return req;
}
im = tevent_create_immediate(req);
if (tevent_req_nomem(im, req)) {
return tevent_req_post(req, ev);
}
tevent_schedule_immediate(im, ev, tevent_barrier_release_trigger, b);
return req;
}
static int tevent_barrier_wait_state_destructor(
struct tevent_barrier_wait_state *s)
{
struct tevent_barrier *b = s->b;
b->waiters[s->index].req = b->waiters[b->count-1].req;
b->count -= 1;
return 0;
}
static void tevent_barrier_release_trigger(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data)
{
struct tevent_barrier *b = talloc_get_type_abort(
private_data, struct tevent_barrier);
tevent_barrier_release(b);
}
int tevent_barrier_wait_recv(struct tevent_req *req)
{
int err;
if (tevent_req_is_unix_error(req, &err)) {
return err;
}
return 0;
}
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