MiPad4/android_device_xiaomi_sdm660-common
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sdm660: folio_daemon: retry slowly on failure

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Bug: 38001818
Test: loaded on taimen
Change-Id: I3f5a8cbf0faca3b5d027dcd74f1b16de80fdbee2
This commit is contained in:
Andrew Lehmer 2017-05-24 09:52:04 -07:00 committed by Max Weffers
parent 33f3f09b13
commit 21e2243476
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GPG key ID: 795F73D22FB93FAE
1 changed files with 28 additions and 6 deletions
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34
folio_daemon/main.cpp
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@ -15,6 +15,7 @@
*/
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <linux/input.h>
#include <linux/uinput.h>
@ -25,8 +26,9 @@
// Hall-effect sensor type
#define SENSOR_TYPE 33171016
// Warn if the polling loop yields zero events at most once every five seconds.
#define WARN_PERIOD (time_t)5
#define RETRY_LIMIT 120
#define RETRY_PERIOD 30 // 30 seconds
#define WARN_PERIOD (time_t)300 // 5 minutes
/*
* This simple daemon listens for events from the Hall-effect sensor and writes
@ -42,6 +44,7 @@ int main(void) {
ALooper *looper;
ASensorEventQueue *eventQueue = nullptr;
time_t lastWarn = 0;
int attemptCount = 0;
ALOGI("Started");
@ -82,10 +85,29 @@ int main(void) {
// Get Hall-effect sensor events from the NDK
sensorManager = ASensorManager_getInstanceForPackage(nullptr);
hallSensor = ASensorManager_getDefaultSensor(sensorManager, SENSOR_TYPE);
if (hallSensor == nullptr) {
ALOGE("Unable to get Hall-effect sensor");
goto out;
/*
* As long as we are unable to get the sensor handle, periodically retry
* and emit an error message at a low frequency to prevent high CPU usage
* and log spam. If we simply exited with an error here, we would be
* immediately restarted and fail in the same way indefinitely.
*/
while (true) {
time_t now = time(NULL);
hallSensor = ASensorManager_getDefaultSensor(sensorManager,
SENSOR_TYPE);
if (hallSensor != nullptr) {
break;
}
if (++attemptCount >= RETRY_LIMIT) {
ALOGE("Retries exhausted; exiting");
goto out;
} else if (now > lastWarn + WARN_PERIOD) {
ALOGE("Unable to get Hall-effect sensor");
lastWarn = now;
}
sleep(RETRY_PERIOD);
}
looper = ALooper_forThread();