53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
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* (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Eric Wild
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdatomic.h>
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#include <stdbool.h>
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#include <stdlib.h>
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struct spsc {
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atomic_uint readptr;
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atomic_uint writeptr;
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int efd_r, efd_w; /* eventfds used to block/notify readers/writers */
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int count;
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int size_per_buf;
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void *buf; /* buffer size count*size_per_buf */
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uintptr_t data[0]; /* count sized array of pointers to size_per_buf chunks in buf array*/
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};
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struct qchan {
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struct spsc *a;
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struct spsc *b;
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};
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bool spsc_push(struct spsc *q, void *elem);
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bool spsc_pop(struct spsc *q, void *elem);
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ssize_t spsc_prep_pop(struct spsc *q);
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int spsc_get_a_rdfd(struct qchan *q);
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struct qchan spsc_chan_init(void *talloc_ctx, unsigned int count, unsigned int size_per_buf);
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struct qchan spsc_chan_init_ex(void *talloc_ctx, unsigned int count, unsigned int size_per_buf, bool blockr_a,
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bool blockw_a, bool blockr_b, bool blockw_b);
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void spsc_chan_close(struct qchan *q);
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