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59e57035 MD |
1 | /* |
2 | * SPDX-License-Identifier: LGPL-2.1-only | |
3 | * | |
4 | * Copyright (C) 2021 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | */ | |
6 | ||
7 | #include <pthread.h> | |
8 | #include <errno.h> | |
9 | #include <error.h> | |
10 | #include <urcu/tls-compat.h> | |
11 | #include <lttng/ust-cancelstate.h> | |
12 | ||
13 | #include "common/logging.h" | |
14 | ||
15 | struct ust_cancelstate { | |
16 | int nesting; | |
17 | int oldstate; /* oldstate for outermost nesting */ | |
18 | }; | |
19 | ||
20 | static DEFINE_URCU_TLS(struct ust_cancelstate, thread_state); | |
21 | ||
22 | int lttng_ust_cancelstate_disable_push(void) | |
23 | { | |
24 | struct ust_cancelstate *state = &URCU_TLS(thread_state); | |
25 | int ret, oldstate; | |
26 | ||
27 | if (state->nesting++) | |
28 | goto end; | |
29 | ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate); | |
30 | if (ret) { | |
31 | ERR("pthread_setcancelstate: %s", strerror(ret)); | |
32 | return -1; | |
33 | } | |
34 | state->oldstate = oldstate; | |
35 | end: | |
36 | return 0; | |
37 | } | |
38 | ||
39 | int lttng_ust_cancelstate_disable_pop(void) | |
40 | { | |
41 | struct ust_cancelstate *state = &URCU_TLS(thread_state); | |
42 | int ret, oldstate; | |
43 | ||
44 | if (!state->nesting) | |
45 | return -1; | |
46 | if (--state->nesting) | |
47 | goto end; | |
48 | ret = pthread_setcancelstate(state->oldstate, &oldstate); | |
49 | if (ret) { | |
50 | ERR("pthread_setcancelstate: %s", strerror(ret)); | |
51 | return -1; | |
52 | } | |
53 | if (oldstate != PTHREAD_CANCEL_DISABLE) { | |
54 | ERR("pthread_setcancelstate: unexpected oldstate"); | |
55 | return -1; | |
56 | } | |
57 | end: | |
58 | return 0; | |
59 | } | |
60 | ||
61 |