| /* |
| * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Eric Wild |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero 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 Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <stdatomic.h> |
| #include <stdbool.h> |
| #include <stdlib.h> |
| |
| struct spsc { |
| atomic_uint readptr; |
| atomic_uint writeptr; |
| |
| int efd_r, efd_w; /* eventfds used to block/notify readers/writers */ |
| |
| int count; |
| int size_per_buf; |
| |
| void *buf; /* buffer size count*size_per_buf */ |
| uintptr_t data[0]; /* count sized array of pointers to size_per_buf chunks in buf array*/ |
| }; |
| |
| struct qchan { |
| struct spsc *a; |
| struct spsc *b; |
| }; |
| |
| bool spsc_push(struct spsc *q, void *elem); |
| bool spsc_pop(struct spsc *q, void *elem); |
| ssize_t spsc_prep_pop(struct spsc *q); |
| int spsc_get_a_rdfd(struct qchan *q); |
| |
| struct qchan spsc_chan_init(void *talloc_ctx, unsigned int count, unsigned int size_per_buf); |
| struct qchan spsc_chan_init_ex(void *talloc_ctx, unsigned int count, unsigned int size_per_buf, bool blockr_a, |
| bool blockw_a, bool blockr_b, bool blockw_b); |
| void spsc_chan_close(struct qchan *q); |