| 1 | #ifndef _TRACEFILE_ARRAY_H |
| 2 | #define _TRACEFILE_ARRAY_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License, version 2 only, as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 14 | * more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along with |
| 17 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | #include <limits.h> |
| 22 | #include <inttypes.h> |
| 23 | #include <pthread.h> |
| 24 | #include <stdbool.h> |
| 25 | |
| 26 | struct tracefile { |
| 27 | /* Per-tracefile head/tail seq. */ |
| 28 | uint64_t seq_head; /* Newest seqcount. Inclusive. */ |
| 29 | uint64_t seq_tail; /* Oldest seqcount. Inclusive. */ |
| 30 | }; |
| 31 | |
| 32 | /* |
| 33 | * Represents an array of trace files in a stream. |
| 34 | */ |
| 35 | struct tracefile_array { |
| 36 | struct tracefile *tf; |
| 37 | size_t count; |
| 38 | |
| 39 | /* Current head/tail files. */ |
| 40 | uint64_t file_head; |
| 41 | uint64_t file_tail; |
| 42 | |
| 43 | /* Overall head/tail seq for the entire array. Inclusive. */ |
| 44 | uint64_t seq_head; |
| 45 | uint64_t seq_tail; |
| 46 | }; |
| 47 | |
| 48 | struct tracefile_array *tracefile_array_create(size_t count); |
| 49 | void tracefile_array_destroy(struct tracefile_array *tfa); |
| 50 | |
| 51 | void tracefile_array_file_rotate(struct tracefile_array *tfa); |
| 52 | void tracefile_array_commit_seq(struct tracefile_array *tfa); |
| 53 | |
| 54 | uint64_t tracefile_array_get_file_index_head(struct tracefile_array *tfa); |
| 55 | /* May return -1ULL in the case where we have not received any indexes yet. */ |
| 56 | uint64_t tracefile_array_get_seq_head(struct tracefile_array *tfa); |
| 57 | |
| 58 | uint64_t tracefile_array_get_file_index_tail(struct tracefile_array *tfa); |
| 59 | /* May return -1ULL in the case where we have not received any indexes yet. */ |
| 60 | uint64_t tracefile_array_get_seq_tail(struct tracefile_array *tfa); |
| 61 | |
| 62 | bool tracefile_array_seq_in_file(struct tracefile_array *tfa, |
| 63 | uint64_t file_index, uint64_t seq); |
| 64 | |
| 65 | #endif /* _STREAM_H */ |