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Get system timestamp less often (only after sleeping/selecting)
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Original file line number | Diff line number | Diff line change |
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/* | ||
Mosh: the mobile shell | ||
Copyright 2012 Keith Winstein | ||
This program is free software: you can redistribute it and/or modify | ||
it under the terms of the GNU General Public License as published by | ||
the Free Software Foundation, either version 3 of the License, or | ||
(at your option) any later version. | ||
This program is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
GNU General Public License for more details. | ||
You should have received a copy of the GNU General Public License | ||
along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
In addition, as a special exception, the copyright holders give | ||
permission to link the code of portions of this program with the | ||
OpenSSL library under certain conditions as described in each | ||
individual source file, and distribute linked combinations including | ||
the two. | ||
You must obey the GNU General Public License in all respects for all | ||
of the code used other than OpenSSL. If you modify file(s) with this | ||
exception, you may extend this exception to your version of the | ||
file(s), but you are not obligated to do so. If you do not wish to do | ||
so, delete this exception statement from your version. If you delete | ||
this exception statement from all source files in the program, then | ||
also delete it here. | ||
*/ | ||
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#include "config.h" | ||
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#include "timestamp.h" | ||
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#include <errno.h> | ||
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#if HAVE_CLOCK_GETTIME | ||
#include <time.h> | ||
#elif HAVE_MACH_ABSOLUTE_TIME | ||
#include <mach/mach_time.h> | ||
#elif HAVE_GETTIMEOFDAY | ||
#include <sys/time.h> | ||
#endif | ||
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static uint64_t millis_cache = -1; | ||
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uint64_t frozen_timestamp( void ) | ||
{ | ||
if ( millis_cache == uint64_t( -1 ) ) { | ||
freeze_timestamp(); | ||
} | ||
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return millis_cache; | ||
} | ||
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void freeze_timestamp( void ) | ||
{ | ||
#if HAVE_CLOCK_GETTIME | ||
struct timespec tp; | ||
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if ( clock_gettime( CLOCK_MONOTONIC, &tp ) < 0 ) { | ||
/* did not succeed */ | ||
} else { | ||
uint64_t millis = tp.tv_nsec / 1000000; | ||
millis += uint64_t( tp.tv_sec ) * 1000; | ||
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millis_cache = millis; | ||
return; | ||
} | ||
#elif HAVE_MACH_ABSOLUTE_TIME | ||
static mach_timebase_info_data_t s_timebase_info; | ||
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if (s_timebase_info.denom == 0) { | ||
mach_timebase_info(&s_timebase_info); | ||
} | ||
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// NB: mach_absolute_time() returns "absolute time units" | ||
// We need to apply a conversion to get milliseconds. | ||
millis_cache = ((mach_absolute_time() * s_timebase_info.numer) / (1000000 * s_timebase_info.denom)); | ||
return; | ||
#elif HAVE_GETTIMEOFDAY | ||
// NOTE: If time steps backwards, timeouts may be confused. | ||
struct timeval tv; | ||
if ( gettimeofday(&tv, NULL) ) { | ||
perror( "gettimeofday" ); | ||
} else { | ||
uint64_t millis = tv.tv_usec / 1000; | ||
millis += uint64_t( tv.tv_sec ) * 1000; | ||
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millis_cache = millis; | ||
return; | ||
} | ||
#else | ||
# error "Don't know how to get a timestamp on this platform" | ||
#endif | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,41 @@ | ||
/* | ||
Mosh: the mobile shell | ||
Copyright 2012 Keith Winstein | ||
This program is free software: you can redistribute it and/or modify | ||
it under the terms of the GNU General Public License as published by | ||
the Free Software Foundation, either version 3 of the License, or | ||
(at your option) any later version. | ||
This program is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
GNU General Public License for more details. | ||
You should have received a copy of the GNU General Public License | ||
along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
In addition, as a special exception, the copyright holders give | ||
permission to link the code of portions of this program with the | ||
OpenSSL library under certain conditions as described in each | ||
individual source file, and distribute linked combinations including | ||
the two. | ||
You must obey the GNU General Public License in all respects for all | ||
of the code used other than OpenSSL. If you modify file(s) with this | ||
exception, you may extend this exception to your version of the | ||
file(s), but you are not obligated to do so. If you do not wish to do | ||
so, delete this exception statement from your version. If you delete | ||
this exception statement from all source files in the program, then | ||
also delete it here. | ||
*/ | ||
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#ifndef TIMESTAMP_HPP | ||
#define TIMESTAMP_HPP | ||
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#include <stdint.h> | ||
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void freeze_timestamp( void ); | ||
uint64_t frozen_timestamp( void ); | ||
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#endif |