Commit | Line | Data |
---|---|---|
6242251b | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2012 Christian Babeux <christian.babeux@efficios.com> |
6242251b | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
6242251b | 5 | * |
6242251b CB |
6 | */ |
7 | ||
8 | #ifdef NTESTPOINT | |
9 | ||
10 | #define testpoint(name) | |
11 | #define TESTPOINT_DECL(name) | |
12 | ||
13 | #else /* NTESTPOINT */ | |
14 | ||
15 | #include <urcu.h> /* for caa_likely/unlikely */ | |
16 | ||
17 | extern int lttng_testpoint_activated; | |
18 | ||
19 | void *lttng_testpoint_lookup(const char *name); | |
20 | ||
21 | /* | |
22 | * Testpoint is only active if the global lttng_testpoint_activated flag is | |
23 | * set. | |
6993eeb3 | 24 | * Return a non-zero error code to indicate failure. |
6242251b | 25 | */ |
28f23191 JG |
26 | #define testpoint(name) \ |
27 | ((caa_unlikely(lttng_testpoint_activated)) ? __testpoint_##name##_wrapper() : 0) | |
6242251b CB |
28 | |
29 | /* | |
30 | * One wrapper per testpoint is generated. This is to keep track of the symbol | |
31 | * lookup status and the corresponding function pointer, if any. | |
32 | */ | |
28f23191 JG |
33 | #define _TESTPOINT_DECL(_name) \ |
34 | static inline int __testpoint_##_name##_wrapper(void) \ | |
35 | { \ | |
36 | int ret = 0; \ | |
37 | static int (*tp)(void); \ | |
38 | static int found; \ | |
39 | const char *tp_name = "__testpoint_" #_name; \ | |
40 | \ | |
41 | if (tp) { \ | |
42 | ret = tp(); \ | |
43 | } else { \ | |
44 | if (!found) { \ | |
45 | tp = (int (*)(void)) lttng_testpoint_lookup(tp_name); \ | |
46 | if (tp) { \ | |
47 | found = 1; \ | |
48 | ret = tp(); \ | |
49 | } else { \ | |
50 | found = -1; \ | |
51 | } \ | |
52 | } \ | |
53 | } \ | |
54 | return ret; \ | |
6242251b CB |
55 | } |
56 | ||
57 | /* Testpoint declaration */ | |
28f23191 | 58 | #define TESTPOINT_DECL(name) _TESTPOINT_DECL(name) |
6242251b CB |
59 | |
60 | #endif /* NTESTPOINT */ |