How can i prevent a process (script) from suspending (freezing) in android?
I have a script which run a command after wait for some minute
#!/sbin/busybox sh
while true; do
sleep 3600;
sync;
sysctl -w vm.drop_caches=2;
done;
but this script will pause after some second as soon as android device goes to sleep. Each time the device wake up the script continue counting. How can i make this script that never suspend (freeze)? I also set -1000 to "oom_score_adj" to not kill by oom. Thank you
How do I prevent an Android device from going to sleep programmatically?
From the root shell (eg adb shell), you can lock with:
echo mylockname >/sys/power/wake_lock
After which the device will stay awake, until you do:
echo mylockname >/sys/power/wake_unlock
With the same string for 'mylockname'.
Note that this will not prevent the screen from going black, but it will prevent the CPU from sleeping.
Note that /sys/power/wake_lock is read-write for user radio (1001) and group system (1000), and, of course, root.
So I guess your script would be:
#!/sbin/busybox sh
echo mylockname >/sys/power/wake_lock;
while true; do
sleep 3600;
sync;
sysctl -w vm.drop_caches=2;
done;
echo mylockname >/sys/power/wake_unlock;
reference
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