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c000cdad | 1 | /* High-resolution sleep with the specified clock. |
ad0e8eb0 | 2 | Copyright (C) 2000, 2001, 2003 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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
c000cdad UD |
19 | |
20 | #include <assert.h> | |
21 | #include <errno.h> | |
8be918b7 | 22 | #include <time.h> |
3b5c1b57 | 23 | #include <hp-timing.h> |
7a114794 | 24 | #include <sysdep-cancel.h> |
c000cdad | 25 | |
3b5c1b57 | 26 | #if HP_TIMING_AVAIL |
ad0e8eb0 | 27 | # define CPUCLOCK_P(clock) \ |
a5ff6104 | 28 | ((clock) == CLOCK_PROCESS_CPUTIME_ID \ |
4165d44d | 29 | || ((clock) & ((1 << CLOCK_IDFIELD_SIZE) - 1)) == CLOCK_THREAD_CPUTIME_ID) |
3b5c1b57 | 30 | #else |
ad0e8eb0 UD |
31 | # define CPUCLOCK_P(clock) 0 |
32 | #endif | |
33 | ||
34 | #ifndef INVALID_CLOCK_P | |
35 | # define INVALID_CLOCK_P(cl) \ | |
a5ff6104 | 36 | ((cl) < CLOCK_REALTIME || (cl) > CLOCK_THREAD_CPUTIME_ID) |
c000cdad UD |
37 | #endif |
38 | ||
39 | ||
40 | /* This implementation assumes that these is only a `nanosleep' system | |
41 | call. So we have to remap all other activities. */ | |
42 | int | |
43 | clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, | |
44 | struct timespec *rem) | |
45 | { | |
46 | struct timespec now; | |
47 | ||
48 | if (__builtin_expect (req->tv_nsec, 0) < 0 | |
49 | || __builtin_expect (req->tv_nsec, 0) >= 1000000000) | |
50 | return EINVAL; | |
51 | ||
ad0e8eb0 UD |
52 | if (CPUCLOCK_P (clock_id)) |
53 | return ENOTSUP; | |
54 | ||
55 | if (INVALID_CLOCK_P (clock_id)) | |
56 | return EINVAL; | |
57 | ||
58 | #ifdef SYSDEP_NANOSLEEP | |
59 | SYSDEP_NANOSLEEP; | |
60 | #endif | |
61 | ||
c000cdad UD |
62 | /* If we got an absolute time, remap it. */ |
63 | if (flags == TIMER_ABSTIME) | |
64 | { | |
65 | long int nsec; | |
66 | long int sec; | |
67 | ||
68 | /* Make sure we use safe data types. */ | |
69 | assert (sizeof (sec) >= sizeof (now.tv_sec)); | |
70 | ||
71 | /* Get the current time for this clock. */ | |
d8317630 | 72 | if (__builtin_expect (clock_gettime (clock_id, &now), 0) != 0) |
c000cdad UD |
73 | return errno; |
74 | ||
75 | /* Compute the difference. */ | |
76 | nsec = req->tv_nsec - now.tv_nsec; | |
77 | sec = req->tv_sec - now.tv_sec - (nsec < 0); | |
78 | if (sec < 0) | |
79 | /* The time has already elapsed. */ | |
80 | return 0; | |
81 | ||
82 | now.tv_sec = sec; | |
83 | now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0); | |
84 | ||
85 | /* From now on this is our time. */ | |
86 | req = &now; | |
87 | ||
88 | /* Make sure we are not modifying the struct pointed to by REM. */ | |
89 | rem = NULL; | |
90 | } | |
91 | else if (__builtin_expect (flags, 0) != 0) | |
92 | return EINVAL; | |
93 | else if (clock_id != CLOCK_REALTIME) | |
ad0e8eb0 UD |
94 | /* Not supported. */ |
95 | return ENOTSUP; | |
c000cdad | 96 | |
60d73a7a | 97 | return __builtin_expect (nanosleep (req, rem), 0) ? errno : 0; |
c000cdad | 98 | } |