| 1 | /* |
| 2 | * context.c |
| 3 | * |
| 4 | * Babeltrace Library |
| 5 | * |
| 6 | * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation |
| 7 | * |
| 8 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 9 | * Julien Desfossez <julien.desfossez@efficios.com> |
| 10 | * |
| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 12 | * of this software and associated documentation files (the "Software"), to deal |
| 13 | * in the Software without restriction, including without limitation the rights |
| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 15 | * copies of the Software, and to permit persons to whom the Software is |
| 16 | * furnished to do so, subject to the following conditions: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | */ |
| 21 | |
| 22 | #include <babeltrace/babeltrace.h> |
| 23 | #include <babeltrace/context.h> |
| 24 | #include <stdlib.h> |
| 25 | |
| 26 | struct bt_context *bt_context_create(struct trace_collection *tc) |
| 27 | { |
| 28 | struct bt_context *ctx; |
| 29 | |
| 30 | ctx = calloc(1, sizeof(struct bt_context)); |
| 31 | if (ctx == NULL) { |
| 32 | perror("allocating context"); |
| 33 | goto error; |
| 34 | } |
| 35 | |
| 36 | ctx->tc = tc; |
| 37 | ctx->refcount = 1; |
| 38 | |
| 39 | return ctx; |
| 40 | |
| 41 | error: |
| 42 | return NULL; |
| 43 | } |
| 44 | |
| 45 | int bt_context_destroy(struct bt_context *ctx) |
| 46 | { |
| 47 | if (ctx) { |
| 48 | if (ctx->refcount >= 1) |
| 49 | goto ctx_used; |
| 50 | |
| 51 | free(ctx); |
| 52 | } |
| 53 | return 0; |
| 54 | |
| 55 | ctx_used: |
| 56 | return -1; |
| 57 | } |
| 58 | |
| 59 | int bt_context_get(struct bt_context *ctx) |
| 60 | { |
| 61 | if (!ctx) |
| 62 | return -1; |
| 63 | ctx->refcount++; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | int bt_context_put(struct bt_context *ctx) |
| 68 | { |
| 69 | if (!ctx) |
| 70 | return -1; |
| 71 | |
| 72 | ctx->refcount--; |
| 73 | if (ctx->refcount == 0) |
| 74 | return bt_context_destroy(ctx); |
| 75 | return 0; |
| 76 | } |