1 /* 2 * Copyright (C) 2019 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /** 39 * @title Linked Queue 40 * 41 */ 42 43 #ifndef BTSTACK_LINKED_QUEUE_H 44 #define BTSTACK_LINKED_QUEUE_H 45 46 #include "btstack_bool.h" 47 #include "btstack_linked_list.h" 48 49 #if defined __cplusplus 50 extern "C" { 51 #endif 52 53 /* API_START */ 54 55 typedef struct { 56 btstack_linked_item_t * head; 57 btstack_linked_item_t * tail; 58 } btstack_linked_queue_t; 59 60 /** 61 * @brief Tests if queue is empty 62 * @return true if emtpy 63 */ 64 bool btstack_linked_queue_empty(btstack_linked_queue_t * queue); 65 66 /** 67 * @brief Append item to queue 68 * @param queue 69 * @param item 70 */ 71 void btstack_linked_queue_enqueue(btstack_linked_queue_t * queue, btstack_linked_item_t * item); 72 73 /** 74 * @brief Pop next item from queue 75 * @param queue 76 * @return item or NULL if queue empty 77 */ 78 btstack_linked_item_t * btstack_linked_queue_dequeue(btstack_linked_queue_t * queue); 79 80 /** 81 * @brief Get first item from queue 82 * @param queue 83 * @return item or NULL if queue empty 84 */ 85 btstack_linked_item_t * btstack_linked_queue_first(btstack_linked_queue_t * queue); 86 87 /* API_END */ 88 89 #if defined __cplusplus 90 } 91 #endif 92 93 #endif // BTSTACK_LINKED_QUEUE_H 94