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595c1577 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> | |
7beb5ba1 | 9 | #include <string.h> |
595c1577 MD |
10 | #include <urcu/tls-compat.h> |
11 | #include <lttng/ust-cancelstate.h> | |
12 | #include <usterr-signal-safe.h> | |
13 | ||
14 | struct ust_cancelstate { | |
15 | int nesting; | |
16 | int oldstate; /* oldstate for outermost nesting */ | |
17 | }; | |
18 | ||
19 | static DEFINE_URCU_TLS(struct ust_cancelstate, thread_state); | |
20 | ||
21 | int lttng_ust_cancelstate_disable_push(void) | |
22 | { | |
23 | struct ust_cancelstate *state = &URCU_TLS(thread_state); | |
24 | int ret, oldstate; | |
25 | ||
26 | if (state->nesting++) | |
27 | goto end; | |
28 | ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate); | |
29 | if (ret) { | |
30 | ERR("pthread_setcancelstate: %s", strerror(ret)); | |
31 | return -1; | |
32 | } | |
33 | state->oldstate = oldstate; | |
34 | end: | |
35 | return 0; | |
36 | } | |
37 | ||
38 | int lttng_ust_cancelstate_disable_pop(void) | |
39 | { | |
40 | struct ust_cancelstate *state = &URCU_TLS(thread_state); | |
41 | int ret, oldstate; | |
42 | ||
43 | if (!state->nesting) | |
44 | return -1; | |
45 | if (--state->nesting) | |
46 | goto end; | |
47 | ret = pthread_setcancelstate(state->oldstate, &oldstate); | |
48 | if (ret) { | |
49 | ERR("pthread_setcancelstate: %s", strerror(ret)); | |
50 | return -1; | |
51 | } | |
52 | if (oldstate != PTHREAD_CANCEL_DISABLE) { | |
53 | ERR("pthread_setcancelstate: unexpected oldstate"); | |
54 | return -1; | |
55 | } | |
56 | end: | |
57 | return 0; | |
58 | } | |
59 | ||
60 |