# no need for shebang - this file is included from other scripts
-LOOPSLEEP_DATE="$(which date)"
+LOOPSLEEP_DATE="$(which date 2>/dev/null || command -v date 2>/dev/null)"
if [ -z "$LOOPSLEEP_DATE" ]
then
echo >&2 "$0: ERROR: Cannot find the command 'date' in the system path."
now_ms=
LOOPSLEEPMS_HIGHRES=1
test "$($LOOPSLEEP_DATE +%N)" = "%N" && LOOPSLEEPMS_HIGHRES=0
+test -z "$($LOOPSLEEP_DATE +%N)" && LOOPSLEEPMS_HIGHRES=0
current_time_ms_from_date() {
if [ $LOOPSLEEPMS_HIGHRES -eq 0 ]
then
current_time_ms_from_date
current_time_ms_from_uptime_started="${now_ms}"
+current_time_ms_from_uptime_last="${now_ms}"
current_time_ms_from_uptime_first=0
current_time_ms_from_uptime() {
- local up rest arr n
+ local up rest arr=() n
read up rest </proc/uptime
if [ $? -ne 0 ]
now_ms=$((current_time_ms_from_uptime_started - current_time_ms_from_uptime_first + n))
- if [ "${now_ms}" -lt "${current_time_ms_from_uptime_started}" ]
+ if [ "${now_ms}" -lt "${current_time_ms_from_uptime_last}" ]
then
- echo >&2 "$0: Cannot use current_time_ms_from_uptime() - falling back to current_time_ms_from_date()."
+ echo >&2 "$0: Cannot use current_time_ms_from_uptime() - new time ${now_ms} is older than the last ${current_time_ms_from_uptime_last} - falling back to current_time_ms_from_date()."
current_time_ms="current_time_ms_from_date"
current_time_ms_from_date
current_time_ms_accuracy=1
fi
+
+ current_time_ms_from_uptime_last="${now_ms}"
}
current_time_ms_from_uptime
current_time_ms_from_uptime_first="$((now_ms - current_time_ms_from_uptime_started))"
+current_time_ms_from_uptime_last="${current_time_ms_from_uptime_first}"
current_time_ms="current_time_ms_from_uptime"
current_time_ms_accuracy=10
if [ "${current_time_ms_from_uptime_first}" -eq 0 ]
mysleep="mysleep_read"
mysleep_fifo="${NETDATA_CACHE_DIR-/tmp}/.netdata_bash_sleep_timer_fifo"
-[ -e "${mysleep_fifo}" ] && rm "${mysleep_fifo}"
-mkfifo "${mysleep_fifo}" || mysleep="sleep"
+[ ! -e "${mysleep_fifo}" ] && mkfifo "${mysleep_fifo}"
+[ ! -e "${mysleep_fifo}" ] && mysleep="sleep"
mysleep_read() {
read -t "${1}" <>"${mysleep_fifo}"
# loop you need.
LOOPSLEEPMS_LASTRUN=0
+LOOPSLEEPMS_NEXTRUN=0
LOOPSLEEPMS_LASTSLEEP=0
LOOPSLEEPMS_LASTWORK=0
loopsleepms() {
- local tellwork=0 t="$1" div s m now mstosleep
+ local tellwork=0 t="${1}" div s m now mstosleep
- if [ "$t" = "tellwork" ]
+ if [ "${t}" = "tellwork" ]
then
tellwork=1
shift
- t="$1"
+ t="${1}"
fi
- div="${2-100}"
# $t = the time in seconds to wait
# if high resolution is not supported
# just sleep the time requested, in seconds
- if [ $LOOPSLEEPMS_HIGHRES -eq 0 ]
+ if [ ${LOOPSLEEPMS_HIGHRES} -eq 0 ]
then
- sleep $t
+ sleep ${t}
return
fi
- # get the current time, in ms
- # milliseconds since epoch (1-1-1970)
- now="$(( $( $LOOPSLEEP_DATE +'%s * 1000 + %-N / 1000000' ) ))"
-
- # calculate required sleep in ms
- t=$((t * 1000 * div / 100))
-
- # this is our first run
- # just wait the requested time
- test $LOOPSLEEPMS_LASTRUN -eq 0 && LOOPSLEEPMS_LASTRUN=$now
+ # get the current time, in ms in ${now_ms}
+ ${current_time_ms}
# calculate ms since last run
- LOOPSLEEPMS_LASTWORK=$((now - LOOPSLEEPMS_LASTRUN - LOOPSLEEPMS_LASTSLEEP))
+ [ ${LOOPSLEEPMS_LASTRUN} -gt 0 ] && \
+ LOOPSLEEPMS_LASTWORK=$((now_ms - LOOPSLEEPMS_LASTRUN - LOOPSLEEPMS_LASTSLEEP + current_time_ms_accuracy))
# echo "# last loop's work took $LOOPSLEEPMS_LASTWORK ms"
+
+ # remember this run
+ LOOPSLEEPMS_LASTRUN=${now_ms}
+
+ # calculate the next run
+ LOOPSLEEPMS_NEXTRUN=$(( ( now_ms - ( now_ms % ( t * 1000 ) ) ) + ( t * 1000 ) ))
# calculate ms to sleep
- mstosleep=$(( t - LOOPSLEEPMS_LASTWORK + current_time_ms_accuracy ))
+ mstosleep=$(( LOOPSLEEPMS_NEXTRUN - now_ms + current_time_ms_accuracy ))
# echo "# mstosleep is $mstosleep ms"
# if we are too slow, sleep some time
- test $mstosleep -lt 200 && mstosleep=200
+ test ${mstosleep} -lt 200 && mstosleep=200
- s=$((mstosleep / 1000))
- m=$((mstosleep - (s * 1000)))
+ s=$(( mstosleep / 1000 ))
+ m=$(( mstosleep - (s * 1000) ))
+ [ "${m}" -lt 100 ] && m="0${m}"
+ [ "${m}" -lt 10 ] && m="0${m}"
- test $tellwork -eq 1 && echo >&2 " >>> PERFORMANCE >>> WORK TOOK $LOOPSLEEPMS_LASTWORK ms ( $((LOOPSLEEPMS_LASTWORK * 100 / 1000)).$((LOOPSLEEPMS_LASTWORK % 10))% cpu ) >>> SLEEPING $mstosleep ms"
+ test $tellwork -eq 1 && echo >&2 " >>> PERFORMANCE >>> WORK TOOK ${LOOPSLEEPMS_LASTWORK} ms ( $((LOOPSLEEPMS_LASTWORK * 100 / 1000)).$((LOOPSLEEPMS_LASTWORK % 10))% cpu ) >>> SLEEPING ${mstosleep} ms"
- # echo "# sleeping $s.$m"
+ # echo "# sleeping ${s}.${m}"
# echo
- ${mysleep} $s.$m
+ ${mysleep} ${s}.${m}
# keep the values we need
# for our next run
- LOOPSLEEPMS_LASTRUN=$now
LOOPSLEEPMS_LASTSLEEP=$mstosleep
}
+
+# test it
+#while [ 1 ]
+#do
+# r=$(( (RANDOM * 2000 / 32767) ))
+# s=$((r / 1000))
+# m=$((r - (s * 1000)))
+# [ "${m}" -lt 100 ] && m="0${m}"
+# [ "${m}" -lt 10 ] && m="0${m}"
+# echo "${r} = ${s}.${m}"
+#
+# # the work
+# ${mysleep} ${s}.${m}
+#
+# # the alignment loop
+# loopsleepms tellwork 1
+#done