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// -*- C++ -*-
//
// Package: FWCore/SharedMemory
// Class : WorkerMonitorThread
//
// Implementation:
// [Notes on implementation]
//
// Original Author: Chris Jones
// Created: 21/01/2020
//
// system include files
#include <cerrno>
#include <csignal>
#include <iostream>
#include <unistd.h>
// user include files
#include "FWCore/SharedMemory/interface/WorkerMonitorThread.h"
//
// constants, enums and typedefs
//
using namespace edm::shared_memory;
//
// static data member definitions
//
std::atomic<bool> WorkerMonitorThread::s_helperThreadDone = false;
std::atomic<int> WorkerMonitorThread::s_pipeReadEnd = 0;
std::atomic<int> WorkerMonitorThread::s_pipeWriteEnd = 0;
//
// constructors and destructor
//
//
// member functions
//
void WorkerMonitorThread::run() {
//std::cerr << "Started cleanup thread\n";
sigset_t ensemble;
sigemptyset(&ensemble);
sigaddset(&ensemble, SIGABRT);
sigaddset(&ensemble, SIGILL);
sigaddset(&ensemble, SIGBUS);
sigaddset(&ensemble, SIGSEGV);
sigaddset(&ensemble, SIGTERM);
pthread_sigmask(SIG_BLOCK, &ensemble, nullptr);
//std::cerr << "Start loop\n";
helperReady_ = true;
while (true) {
int signal = -1;
auto res = read(s_pipeReadEnd.load(), &signal, sizeof(signal) / sizeof(char));
if (res == -1) {
if (errno == EINTR) {
continue;
}
abort();
}
if (signal != 0) {
if (actionSet_) {
action_();
}
std::cerr << "Worker: SIGNAL CAUGHT " << signal << "\n";
s_helperThreadDone = true;
break;
} /* else {
std::cerr << "SIGNAL woke\n";
} */
}
//std::cerr << "Ending cleanup thread\n";
}
void WorkerMonitorThread::startThread() {
{
//Setup watchdog thread for crashing signals
int pipeEnds[2] = {0, 0};
auto ret = pipe(pipeEnds);
if (ret != 0) {
abort();
}
s_pipeReadEnd.store(pipeEnds[0]);
s_pipeWriteEnd.store(pipeEnds[1]);
//Need to use signal handler since signals generated
// from within a program are thread specific which can
// only be handed by a signal handler
setupSignalHandling();
std::thread t(&WorkerMonitorThread::run, this);
t.detach();
helperThread_ = std::move(t);
}
while (helperReady_.load() == false) {
}
}
void WorkerMonitorThread::setupSignalHandling() {
struct sigaction act;
act.sa_sigaction = sig_handler;
act.sa_flags = SA_SIGINFO;
sigemptyset(&act.sa_mask);
sigaction(SIGABRT, &act, nullptr);
sigaction(SIGILL, &act, nullptr);
sigaction(SIGBUS, &act, nullptr);
sigaction(SIGSEGV, &act, nullptr);
sigaction(SIGTERM, &act, nullptr);
}
void WorkerMonitorThread::stop() {
stopRequested_ = true;
int sig = 0;
write(s_pipeWriteEnd.load(), &sig, sizeof(int) / sizeof(char));
}
//
// const member functions
//
//
// static member functions
//
void WorkerMonitorThread::sig_handler(int sig, siginfo_t*, void*) {
write(s_pipeWriteEnd.load(), &sig, sizeof(int) / sizeof(char));
while (not s_helperThreadDone) {
};
signal(sig, SIG_DFL);
raise(sig);
}
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