1 #ifndef JEMALLOC_INTERNAL_QR_H 2 #define JEMALLOC_INTERNAL_QR_H 3 4 /* Ring definitions. */ 5 #define qr(a_type) \ 6 struct { \ 7 a_type *qre_next; \ 8 a_type *qre_prev; \ 9 } 10 11 /* Ring functions. */ 12 #define qr_new(a_qr, a_field) do { \ 13 (a_qr)->a_field.qre_next = (a_qr); \ 14 (a_qr)->a_field.qre_prev = (a_qr); \ 15 } while (0) 16 17 #define qr_next(a_qr, a_field) ((a_qr)->a_field.qre_next) 18 19 #define qr_prev(a_qr, a_field) ((a_qr)->a_field.qre_prev) 20 21 #define qr_before_insert(a_qrelm, a_qr, a_field) do { \ 22 (a_qr)->a_field.qre_prev = (a_qrelm)->a_field.qre_prev; \ 23 (a_qr)->a_field.qre_next = (a_qrelm); \ 24 (a_qr)->a_field.qre_prev->a_field.qre_next = (a_qr); \ 25 (a_qrelm)->a_field.qre_prev = (a_qr); \ 26 } while (0) 27 28 #define qr_after_insert(a_qrelm, a_qr, a_field) do { \ 29 (a_qr)->a_field.qre_next = (a_qrelm)->a_field.qre_next; \ 30 (a_qr)->a_field.qre_prev = (a_qrelm); \ 31 (a_qr)->a_field.qre_next->a_field.qre_prev = (a_qr); \ 32 (a_qrelm)->a_field.qre_next = (a_qr); \ 33 } while (0) 34 35 #define qr_meld(a_qr_a, a_qr_b, a_type, a_field) do { \ 36 a_type *t; \ 37 (a_qr_a)->a_field.qre_prev->a_field.qre_next = (a_qr_b); \ 38 (a_qr_b)->a_field.qre_prev->a_field.qre_next = (a_qr_a); \ 39 t = (a_qr_a)->a_field.qre_prev; \ 40 (a_qr_a)->a_field.qre_prev = (a_qr_b)->a_field.qre_prev; \ 41 (a_qr_b)->a_field.qre_prev = t; \ 42 } while (0) 43 44 /* 45 * qr_meld() and qr_split() are functionally equivalent, so there's no need to 46 * have two copies of the code. 47 */ 48 #define qr_split(a_qr_a, a_qr_b, a_type, a_field) \ 49 qr_meld((a_qr_a), (a_qr_b), a_type, a_field) 50 51 #define qr_remove(a_qr, a_field) do { \ 52 (a_qr)->a_field.qre_prev->a_field.qre_next \ 53 = (a_qr)->a_field.qre_next; \ 54 (a_qr)->a_field.qre_next->a_field.qre_prev \ 55 = (a_qr)->a_field.qre_prev; \ 56 (a_qr)->a_field.qre_next = (a_qr); \ 57 (a_qr)->a_field.qre_prev = (a_qr); \ 58 } while (0) 59 60 #define qr_foreach(var, a_qr, a_field) \ 61 for ((var) = (a_qr); \ 62 (var) != NULL; \ 63 (var) = (((var)->a_field.qre_next != (a_qr)) \ 64 ? (var)->a_field.qre_next : NULL)) 65 66 #define qr_reverse_foreach(var, a_qr, a_field) \ 67 for ((var) = ((a_qr) != NULL) ? qr_prev(a_qr, a_field) : NULL; \ 68 (var) != NULL; \ 69 (var) = (((var) != (a_qr)) \ 70 ? (var)->a_field.qre_prev : NULL)) 71 72 #endif /* JEMALLOC_INTERNAL_QR_H */ 73
