124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
/*
|
|
* Copyright 2021 Google, Inc
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#define LOG_TAG "lowmemorykiller"
|
|
|
|
#include <errno.h>
|
|
#include <log/log.h>
|
|
#include <string.h>
|
|
|
|
#include <processgroup/processgroup.h>
|
|
|
|
#include "watchdog.h"
|
|
|
|
static void* watchdog_main(void* param) {
|
|
Watchdog *watchdog = static_cast<Watchdog*>(param);
|
|
sigset_t sigset;
|
|
int signum;
|
|
|
|
// Ensure the thread does not use little cores
|
|
if (!SetTaskProfiles(gettid(), {"CPUSET_SP_FOREGROUND"}, true)) {
|
|
ALOGE("Failed to assign cpuset to the watchdog thread");
|
|
}
|
|
|
|
if (!watchdog->create_timer(sigset)) {
|
|
ALOGE("Watchdog timer creation failed!");
|
|
return NULL;
|
|
}
|
|
|
|
while (true) {
|
|
if (sigwait(&sigset, &signum) == -1) {
|
|
ALOGE("sigwait failed: %s", strerror(errno));
|
|
}
|
|
|
|
watchdog->bite();
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
bool Watchdog::init() {
|
|
pthread_t thread;
|
|
|
|
if (pthread_create(&thread, NULL, watchdog_main, this)) {
|
|
ALOGE("pthread_create failed: %s", strerror(errno));
|
|
return false;
|
|
}
|
|
if (pthread_setname_np(thread, "lmkd_watchdog")) {
|
|
ALOGW("pthread_setname_np failed: %s", strerror(errno));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Watchdog::start() {
|
|
// Start the timer and keep it active until it's disarmed
|
|
struct itimerspec new_timer;
|
|
|
|
if (!timer_created_) {
|
|
return false;
|
|
}
|
|
|
|
new_timer.it_value.tv_sec = timeout_;
|
|
new_timer.it_value.tv_nsec = 0;
|
|
new_timer.it_interval.tv_sec = timeout_;
|
|
new_timer.it_interval.tv_nsec = 0;
|
|
|
|
if (timer_settime(timer_, 0, &new_timer, NULL)) {
|
|
ALOGE("timer_settime failed: %s", strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Watchdog::stop() {
|
|
struct itimerspec new_timer = {};
|
|
|
|
if (!timer_created_) {
|
|
return false;
|
|
}
|
|
|
|
if (timer_settime(timer_, 0, &new_timer, NULL)) {
|
|
ALOGE("timer_settime failed: %s", strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Watchdog::create_timer(sigset_t &sigset) {
|
|
struct sigevent sevent;
|
|
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, SIGALRM);
|
|
if (sigprocmask(SIG_BLOCK, &sigset, NULL)) {
|
|
ALOGE("sigprocmask failed: %s", strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
sevent.sigev_notify = SIGEV_THREAD_ID;
|
|
sevent.sigev_notify_thread_id = gettid();
|
|
sevent.sigev_signo = SIGALRM;
|
|
if (timer_create(CLOCK_MONOTONIC, &sevent, &timer_)) {
|
|
ALOGE("timer_create failed: %s", strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
timer_created_ = true;
|
|
return true;
|
|
}
|