projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c000cdad | 1 | /* High-resolution sleep with the specified clock. |
| 8be918b7 | 2 | Copyright (C) 2000, 2001 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 | |
| 6 | modify it under the terms of the GNU Library General Public License as | |
| 7 | published by the Free Software Foundation; either version 2 of the | |
| 8 | License, or (at your option) any later version. | |
| 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 | |
| 13 | Library General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Library General Public | |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 18 | Boston, MA 02111-1307, USA. */ | |
| 19 | ||
| 20 | #include <assert.h> | |
| 21 | #include <errno.h> | |
| 8be918b7 | 22 | #include <time.h> |
| 3b5c1b57 | 23 | #include <hp-timing.h> |
| c000cdad UD |
24 | |
| 25 | ||
| 3b5c1b57 UD |
26 | #if HP_TIMING_AVAIL |
| 27 | # define CLOCK_P(clock) \ | |
| 28 | (clock) != CLOCK_PROCESS_CPUTIME_ID \ | |
| 29 | && (clock) != CLOCK_THREAD_CPUTIME_ID | |
| 30 | #else | |
| c000cdad UD |
31 | # define CLOCK_P(clock) 0 |
| 32 | #endif | |
| 33 | ||
| 34 | ||
| 35 | /* This implementation assumes that these is only a `nanosleep' system | |
| 36 | call. So we have to remap all other activities. */ | |
| 37 | int | |
| 38 | clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, | |
| 39 | struct timespec *rem) | |
| 40 | { | |
| 41 | struct timespec now; | |
| 42 | ||
| 43 | if (__builtin_expect (req->tv_nsec, 0) < 0 | |
| 44 | || __builtin_expect (req->tv_nsec, 0) >= 1000000000) | |
| 45 | return EINVAL; | |
| 46 | ||
| 47 | /* If we got an absolute time, remap it. */ | |
| 48 | if (flags == TIMER_ABSTIME) | |
| 49 | { | |
| 50 | long int nsec; | |
| 51 | long int sec; | |
| 52 | ||
| 53 | /* Make sure we use safe data types. */ | |
| 54 | assert (sizeof (sec) >= sizeof (now.tv_sec)); | |
| 55 | ||
| 56 | /* Get the current time for this clock. */ | |
| d8317630 | 57 | if (__builtin_expect (clock_gettime (clock_id, &now), 0) != 0) |
| c000cdad UD |
58 | return errno; |
| 59 | ||
| 60 | /* Compute the difference. */ | |
| 61 | nsec = req->tv_nsec - now.tv_nsec; | |
| 62 | sec = req->tv_sec - now.tv_sec - (nsec < 0); | |
| 63 | if (sec < 0) | |
| 64 | /* The time has already elapsed. */ | |
| 65 | return 0; | |
| 66 | ||
| 67 | now.tv_sec = sec; | |
| 68 | now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0); | |
| 69 | ||
| 70 | /* From now on this is our time. */ | |
| 71 | req = &now; | |
| 72 | ||
| 73 | /* Make sure we are not modifying the struct pointed to by REM. */ | |
| 74 | rem = NULL; | |
| 75 | } | |
| 76 | else if (__builtin_expect (flags, 0) != 0) | |
| 77 | return EINVAL; | |
| 78 | else if (clock_id != CLOCK_REALTIME) | |
| 79 | { | |
| 80 | /* Make sure the clock ID is correct. */ | |
| 81 | if (__builtin_expect (! CLOCK_P (clock_id), 0)) | |
| 82 | return EINVAL; | |
| 83 | } | |
| 84 | ||
| 85 | return __builtin_expect (nanosleep (req, rem), 0) ? errno : 0; | |
| 86 | } |