[a0e6c73] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @brief Convert Absolute Timeout to Ticks |
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[21789a21] | 5 | * @ingroup ScoreTOD |
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[412dbff6] | 6 | */ |
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| 7 | |
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| 8 | /* |
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[6a0898b] | 9 | * COPYRIGHT (c) 1989-2008. |
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[412dbff6] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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| 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[c499856] | 14 | * http://www.rtems.org/license/LICENSE. |
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[ba16717] | 15 | */ |
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| 16 | |
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| 17 | #if HAVE_CONFIG_H |
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| 18 | #include "config.h" |
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| 19 | #endif |
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| 20 | |
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[f031df0e] | 21 | #include <rtems/score/todimpl.h> |
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[ba16717] | 22 | |
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| 23 | /* |
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| 24 | * The abstime is a walltime. We turn it into an interval. |
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| 25 | */ |
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[21789a21] | 26 | TOD_Absolute_timeout_conversion_results _TOD_Absolute_timeout_to_ticks( |
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[ba16717] | 27 | const struct timespec *abstime, |
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[b5bfaaf9] | 28 | clockid_t clock, |
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[ba16717] | 29 | Watchdog_Interval *ticks_out |
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| 30 | ) |
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| 31 | { |
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[412dbff6] | 32 | struct timespec current_time; |
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| 33 | struct timespec difference; |
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[ba16717] | 34 | |
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[6a0898b] | 35 | /* |
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| 36 | * Make sure there is always a value returned. |
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| 37 | */ |
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| 38 | *ticks_out = 0; |
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[ba16717] | 39 | |
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[6a0898b] | 40 | /* |
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| 41 | * Is the absolute time even valid? |
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| 42 | */ |
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| 43 | if ( !_Timespec_Is_valid(abstime) ) |
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[21789a21] | 44 | return TOD_ABSOLUTE_TIMEOUT_INVALID; |
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[ba16717] | 45 | |
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| 46 | /* |
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[6a0898b] | 47 | * Is the absolute time in the past? |
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[ba16717] | 48 | */ |
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[b5bfaaf9] | 49 | if ( clock == CLOCK_REALTIME ) { |
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[2256946] | 50 | _TOD_Get( ¤t_time ); |
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[b5bfaaf9] | 51 | } else { |
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| 52 | _Assert( clock == CLOCK_MONOTONIC ); |
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| 53 | _TOD_Get_zero_based_uptime_as_timespec( ¤t_time ); |
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| 54 | } |
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[6a0898b] | 55 | |
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[412dbff6] | 56 | if ( _Timespec_Less_than( abstime, ¤t_time ) ) |
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[21789a21] | 57 | return TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST; |
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[ba16717] | 58 | |
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[6a0898b] | 59 | /* |
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| 60 | * How long until the requested absolute time? |
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| 61 | */ |
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[412dbff6] | 62 | _Timespec_Subtract( ¤t_time, abstime, &difference ); |
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[ba16717] | 63 | |
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[6a0898b] | 64 | /* |
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| 65 | * Internally the SuperCore uses ticks, so convert to them. |
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| 66 | */ |
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[412dbff6] | 67 | *ticks_out = _Timespec_To_ticks( &difference ); |
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[ba16717] | 68 | |
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[6a0898b] | 69 | /* |
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| 70 | * If the difference was 0, then the future is now. It is so bright |
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| 71 | * we better wear shades. |
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| 72 | */ |
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| 73 | if ( !*ticks_out ) |
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[21789a21] | 74 | return TOD_ABSOLUTE_TIMEOUT_IS_NOW; |
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[6a0898b] | 75 | |
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| 76 | /* |
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| 77 | * This is the case we were expecting and it took this long to |
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| 78 | * get here. |
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| 79 | */ |
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[21789a21] | 80 | return TOD_ABSOLUTE_TIMEOUT_IS_IN_FUTURE; |
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[ba16717] | 81 | } |
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| 82 | |
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