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51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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Copyright (c) 2020 Sogou, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author: Xie Han (xiehan@sogou-inc.com)
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*/
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#ifndef _MSGQUEUE_H_
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#define _MSGQUEUE_H_
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#include <stddef.h>
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typedef struct __msgqueue msgqueue_t;
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* A simple implementation of message queue. The max pending messages may
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* reach two times 'maxlen' when the queue is in blocking mode, and infinite
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* in nonblocking mode. 'linkoff' is the offset from the head of each message,
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* where spaces of one pointer size should be available for internal usage.
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* 'linkoff' can be positive or negative or zero. */
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msgqueue_t *msgqueue_create(size_t maxlen, int linkoff);
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void *msgqueue_get(msgqueue_t *queue);
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void msgqueue_put(void *msg, msgqueue_t *queue);
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void msgqueue_put_head(void *msg, msgqueue_t *queue);
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void msgqueue_set_nonblock(msgqueue_t *queue);
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void msgqueue_set_block(msgqueue_t *queue);
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void msgqueue_destroy(msgqueue_t *queue);
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#ifdef __cplusplus
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}
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#endif
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#endif
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