API : trace_handle
[babeltrace.git] / lib / context.c
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 ctx->last_trace_handle_id = 0;
39
40 return ctx;
41
42 error:
43 return NULL;
44 }
45
46 int bt_context_destroy(struct bt_context *ctx)
47 {
48 if (ctx) {
49 if (ctx->refcount >= 1)
50 goto ctx_used;
51
52 free(ctx);
53 }
54 return 0;
55
56 ctx_used:
57 return -1;
58 }
59
60 int bt_context_get(struct bt_context *ctx)
61 {
62 if (!ctx)
63 return -1;
64 ctx->refcount++;
65 return 0;
66 }
67
68 int bt_context_put(struct bt_context *ctx)
69 {
70 if (!ctx)
71 return -1;
72
73 ctx->refcount--;
74 if (ctx->refcount == 0)
75 return bt_context_destroy(ctx);
76 return 0;
77 }
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