git://sourceware.org / glibc.git / blame
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|---|---|---|
| 118bad87 | 1 | /* High precision, low overhead timing functions. Generic version. |
| 568035b7 | 2 | Copyright (C) 1998-2013 Free Software Foundation, Inc. |
| db276fa1 UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
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. | |
| db276fa1 UD |
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 | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| db276fa1 | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| db276fa1 UD |
19 | |
| 20 | #ifndef _HP_TIMING_H | |
| 21 | #define _HP_TIMING_H 1 | |
| 22 | ||
| 23 | ||
| 24 | /* There are no generic definitions for the times. We could write something | |
| 25 | using the `gettimeofday' system call where available but the overhead of | |
| 26 | the system call might be too high. | |
| 27 | ||
| 28 | In case a platform supports timers in the hardware the following macros | |
| 29 | and types must be defined: | |
| 30 | ||
| 31 | - HP_TIMING_AVAIL: test for availability. | |
| 32 | ||
| 33 | - HP_TIMING_INLINE: this macro is non-zero if the functionality is not | |
| 34 | implemented using function calls but instead uses some inlined code | |
| 35 | which might simply consist of a few assembler instructions. We have to | |
| 36 | know this since we might want to use the macros here in places where we | |
| 37 | cannot make function calls. | |
| 38 | ||
| 39 | - hp_timing_t: This is the type for variables used to store the time | |
| 40 | values. | |
| 41 | ||
| 42 | - HP_TIMING_ZERO: clear `hp_timing_t' object. | |
| 43 | ||
| 44 | - HP_TIMING_NOW: place timestamp for current time in variable given as | |
| 45 | parameter. | |
| 46 | ||
| 47 | - HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the | |
| 48 | HP_TIMING_DIFF macro. | |
| 49 | ||
| 50 | - HP_TIMING_DIFF: compute difference between two times and store it | |
| 51 | in a third. Source and destination might overlap. | |
| 52 | ||
| 53 | - HP_TIMING_ACCUM: add time difference to another variable. This might | |
| 54 | be a bit more complicated to implement for some platforms as the | |
| 55 | operation should be thread-safe and 64bit arithmetic on 32bit platforms | |
| 56 | is not. | |
| 57 | ||
| 58 | - HP_TIMING_ACCUM_NT: this is the variant for situations where we know | |
| 59 | there are no threads involved. | |
| 60 | ||
| 61 | - HP_TIMING_PRINT: write decimal representation of the timing value into | |
| 62 | the given string. This operation need not be inline even though | |
| 63 | HP_TIMING_INLINE is specified. | |
| 64 | ||
| 65 | */ | |
| 66 | ||
| 67 | /* Provide dummy definitions. */ | |
| 68 | #define HP_TIMING_AVAIL (0) | |
| 69 | #define HP_TIMING_INLINE (0) | |
| 70 | typedef int hp_timing_t; | |
| 71 | #define HP_TIMING_ZERO(Var) | |
| 72 | #define HP_TIMING_NOW(var) | |
| 73 | #define HP_TIMING_DIFF_INIT() | |
| 74 | #define HP_TIMING_DIFF(Diff, Start, End) | |
| 75 | #define HP_TIMING_ACCUM(Sum, Diff) | |
| 76 | #define HP_TIMING_ACCUM_NT(Sum, Diff) | |
| 77 | #define HP_TIMING_PRINT(Buf, Len, Val) | |
| 78 | ||
| 5732c4df UD |
79 | /* Since this implementation is not available we tell the user about it. */ |
| 80 | #define HP_TIMING_NONAVAIL 1 | |
| 81 | ||
| db276fa1 | 82 | #endif /* hp-timing.h */ |