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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2015-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "erl_os_monotonic_time_extender.h"
#ifdef USE_THREADS
static void *os_monotonic_time_extender(void *vstatep)
{
ErtsOsMonotonicTimeExtendState *state = (ErtsOsMonotonicTimeExtendState *) vstatep;
long sleep_time = state->check_interval*1000;
Uint32 (*raw_os_mtime)(void) = state->raw_os_monotonic_time;
Uint32 last_msb = 0;
while (1) {
Uint32 msb = (*raw_os_mtime)() & (((Uint32) 1) << 31);
if (msb != last_msb) {
int ix = ((int) (last_msb >> 31)) & 1;
Uint32 xtnd = (Uint32) erts_atomic32_read_nob(&state->extend[ix]);
erts_atomic32_set_nob(&state->extend[ix], (erts_aint32_t) (xtnd + 1));
last_msb = msb;
}
erts_milli_sleep(sleep_time);
}
erts_exit(ERTS_ABORT_EXIT, "os_monotonic_time_extender thread terminating");
return NULL;
}
static erts_tid_t os_monotonic_extender_tid;
#endif
void
erts_init_os_monotonic_time_extender(ErtsOsMonotonicTimeExtendState *statep,
Uint32 (*raw_os_monotonic_time)(void),
int check_seconds)
{
#ifdef USE_THREADS
statep->raw_os_monotonic_time = raw_os_monotonic_time;
erts_atomic32_init_nob(&statep->extend[0], (erts_aint32_t) 0);
erts_atomic32_init_nob(&statep->extend[1], (erts_aint32_t) 0);
statep->check_interval = check_seconds;
#else
statep->extend[0] = (Uint32) 0;
statep->extend[1] = (Uint32) 0;
statep->last_msb = (ErtsMonotonicTime) 0;
#endif
}
void
erts_late_init_os_monotonic_time_extender(ErtsOsMonotonicTimeExtendState *statep)
{
#ifdef USE_THREADS
erts_thr_opts_t thr_opts = ERTS_THR_OPTS_DEFAULT_INITER;
thr_opts.detached = 1;
thr_opts.suggested_stack_size = 4;
#if 0
thr_opts.name = "os_monotonic_time_extender";
#endif
erts_thr_create(&os_monotonic_extender_tid,
os_monotonic_time_extender,
(void*) statep,
&thr_opts);
#endif
}
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