1 /************************************************************************** 2 * 3 * Copyright 2009 Jakob Bornecrantz 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 **************************************************************************/ 25 26 #ifndef U_FIFO_H 27 #define U_FIFO_H 28 29 #include "util/u_memory.h" 30 31 struct util_fifo 32 { 33 size_t head; 34 size_t tail; 35 size_t num; 36 size_t size; 37 }; 38 39 static inline struct util_fifo * 40 u_fifo_create(size_t size) 41 { 42 struct util_fifo *fifo; 43 fifo = MALLOC(sizeof(*fifo) + size * sizeof(void*)); 44 45 fifo->head = 0; 46 fifo->tail = 0; 47 fifo->num = 0; 48 fifo->size = size; 49 50 return fifo; 51 } 52 53 static inline boolean 54 u_fifo_add(struct util_fifo *fifo, void *ptr) 55 { 56 void **array = (void**)&fifo[1]; 57 if (fifo->num >= fifo->size) 58 return FALSE; 59 60 if (++fifo->head >= fifo->size) 61 fifo->head = 0; 62 63 array[fifo->head] = ptr; 64 65 ++fifo->num; 66 67 return TRUE; 68 } 69 70 static inline boolean 71 u_fifo_pop(struct util_fifo *fifo, void **ptr) 72 { 73 void **array = (void**)&fifo[1]; 74 75 if (!fifo->num) 76 return FALSE; 77 78 if (++fifo->tail >= fifo->size) 79 fifo->tail = 0; 80 81 *ptr = array[fifo->tail]; 82 83 ++fifo->num; 84 85 return TRUE; 86 } 87 88 static inline void 89 u_fifo_destroy(struct util_fifo *fifo) 90 { 91 FREE(fifo); 92 } 93 94 #endif 95
