1 | /* Timed low level locking for pthread library. Generic futex-using version. |
2 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <atomic.h> |
21 | #include <errno.h> |
22 | #include <lowlevellock.h> |
23 | #include <sys/time.h> |
24 | #include <time.h> |
25 | |
26 | |
27 | int |
28 | __lll_clocklock_wait (int *futex, int val, clockid_t clockid, |
29 | const struct timespec *abstime, int private) |
30 | { |
31 | struct timespec ts, *tsp = NULL; |
32 | |
33 | if (abstime != NULL) |
34 | { |
35 | /* Reject invalid timeouts. */ |
36 | if (! valid_nanoseconds (abstime->tv_nsec)) |
37 | return EINVAL; |
38 | |
39 | /* Get the current time. This can only fail if clockid is not valid. */ |
40 | if (__glibc_unlikely (__clock_gettime (clockid, &ts) != 0)) |
41 | return EINVAL; |
42 | |
43 | /* Compute relative timeout. */ |
44 | ts.tv_sec = abstime->tv_sec - ts.tv_sec; |
45 | ts.tv_nsec = abstime->tv_nsec - ts.tv_nsec; |
46 | if (ts.tv_nsec < 0) |
47 | { |
48 | ts.tv_nsec += 1000000000; |
49 | --ts.tv_sec; |
50 | } |
51 | |
52 | if (ts.tv_sec < 0) |
53 | return ETIMEDOUT; |
54 | |
55 | tsp = &ts; |
56 | } |
57 | |
58 | /* If *futex == val, wait until woken or timeout. */ |
59 | lll_futex_timed_wait (futex, val, tsp, private); |
60 | |
61 | return 0; |
62 | } |
63 | |