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c000cdad | 1 | /* High-resolution sleep with the specified clock. |
04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
c000cdad UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
c000cdad UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c000cdad | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
c000cdad UD |
18 | |
19 | #include <assert.h> | |
20 | #include <errno.h> | |
8be918b7 | 21 | #include <time.h> |
3b5c1b57 | 22 | #include <hp-timing.h> |
7a114794 | 23 | #include <sysdep-cancel.h> |
c000cdad | 24 | |
3b5c1b57 | 25 | #if HP_TIMING_AVAIL |
ad0e8eb0 | 26 | # define CPUCLOCK_P(clock) \ |
a5ff6104 | 27 | ((clock) == CLOCK_PROCESS_CPUTIME_ID \ |
4165d44d | 28 | || ((clock) & ((1 << CLOCK_IDFIELD_SIZE) - 1)) == CLOCK_THREAD_CPUTIME_ID) |
3b5c1b57 | 29 | #else |
ad0e8eb0 UD |
30 | # define CPUCLOCK_P(clock) 0 |
31 | #endif | |
32 | ||
33 | #ifndef INVALID_CLOCK_P | |
34 | # define INVALID_CLOCK_P(cl) \ | |
a5ff6104 | 35 | ((cl) < CLOCK_REALTIME || (cl) > CLOCK_THREAD_CPUTIME_ID) |
c000cdad UD |
36 | #endif |
37 | ||
38 | ||
39 | /* This implementation assumes that these is only a `nanosleep' system | |
40 | call. So we have to remap all other activities. */ | |
41 | int | |
89fb6835 SP |
42 | __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, |
43 | struct timespec *rem) | |
c000cdad UD |
44 | { |
45 | struct timespec now; | |
46 | ||
47 | if (__builtin_expect (req->tv_nsec, 0) < 0 | |
48 | || __builtin_expect (req->tv_nsec, 0) >= 1000000000) | |
49 | return EINVAL; | |
50 | ||
60fce589 RM |
51 | if (clock_id == CLOCK_THREAD_CPUTIME_ID) |
52 | return EINVAL; /* POSIX specifies EINVAL for this case. */ | |
53 | ||
54 | #ifdef SYSDEP_NANOSLEEP | |
55 | SYSDEP_NANOSLEEP; | |
56 | #endif | |
57 | ||
ad0e8eb0 UD |
58 | if (CPUCLOCK_P (clock_id)) |
59 | return ENOTSUP; | |
60 | ||
61 | if (INVALID_CLOCK_P (clock_id)) | |
62 | return EINVAL; | |
63 | ||
c000cdad UD |
64 | /* If we got an absolute time, remap it. */ |
65 | if (flags == TIMER_ABSTIME) | |
66 | { | |
67 | long int nsec; | |
68 | long int sec; | |
69 | ||
70 | /* Make sure we use safe data types. */ | |
71 | assert (sizeof (sec) >= sizeof (now.tv_sec)); | |
72 | ||
73 | /* Get the current time for this clock. */ | |
dba2bdbe | 74 | if (__builtin_expect (__clock_gettime (clock_id, &now), 0) != 0) |
c000cdad UD |
75 | return errno; |
76 | ||
77 | /* Compute the difference. */ | |
78 | nsec = req->tv_nsec - now.tv_nsec; | |
79 | sec = req->tv_sec - now.tv_sec - (nsec < 0); | |
80 | if (sec < 0) | |
81 | /* The time has already elapsed. */ | |
82 | return 0; | |
83 | ||
84 | now.tv_sec = sec; | |
85 | now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0); | |
86 | ||
87 | /* From now on this is our time. */ | |
88 | req = &now; | |
89 | ||
90 | /* Make sure we are not modifying the struct pointed to by REM. */ | |
91 | rem = NULL; | |
92 | } | |
93 | else if (__builtin_expect (flags, 0) != 0) | |
94 | return EINVAL; | |
95 | else if (clock_id != CLOCK_REALTIME) | |
ad0e8eb0 UD |
96 | /* Not supported. */ |
97 | return ENOTSUP; | |
c000cdad | 98 | |
dba2bdbe | 99 | return __builtin_expect (__nanosleep (req, rem), 0) ? errno : 0; |
c000cdad | 100 | } |
89fb6835 | 101 | weak_alias (__clock_nanosleep, clock_nanosleep) |