wmbusmeters/src/threads.h

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3.4 KiB
C++

/*
Copyright (C) 2020 Fredrik Öhrström
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef THREADS_H
#define THREADS_H
#include "util.h"
#include <assert.h>
#include <errno.h>
#include <functional>
#include <pthread.h>
#include <sys/types.h>
#include <unistd.h>
// Declare all threads and locks used in wmbusmeters!
// When the main thread enters serial_manager->waitForStop()
// this thread is recorded as the main thread. It will
// now just sleep until its time for wmbusmeters to exit.
pthread_t getMainThread();
void recordMyselfAsMainThread();
// The event loop thread runs the event loop and executes callbacks to file descriptor
// listeners. This thread is used for all the important work:
// Wmbus-dongle protocol decoding, followed by parsing of telegrams and eventually
// updating and printing meter values and executing a subshell for mqtt.
//
// This thread is not allowed to send commands to the dongles or update
// wmbus-devices or serial-devices, if it does, then wmbusmeters will deadlock,
// since the callbacks are needed to execute the commands.
pthread_t getEventLoopThread();
void startEventLoopThread(std::function<void()> cb);
// The timer callback thread runs whenever a timer timeout has happened.
// This thread is used to probe for lost/found dongles, send commands to dongles,
// reset dongles due to alarms, and generally monitor the system.
pthread_t getTimerLoopThread();
void startTimerLoopThread(std::function<void()> cb);
size_t getPeakRSS();
size_t getCurrentRSS();
#define LOCK(module,func,x) { trace("[LOCKING] " #x " " func " (%s %d)\n", x ## func_, x ## pid_); \
pthread_mutex_lock(&x); \
x ## func_ = func; \
x ## pid_ = getpid(); \
trace("[LOCKED] " #x " " func "\n"); }
#define UNLOCK(module,func,x) { trace("[UNLOCKING] " #x " " func " (%s %d) \n", x ## func_, x ## pid_); \
pthread_mutex_unlock(&x); \
x ## func_ = ""; \
x ## pid_ = 0; \
trace("[UNLOCKED] " #x " " func "\n"); }
#define WITH(mutex,name,func) Lock local_ ## name (&mutex, #func)
struct Lock;
struct RecursiveMutex
{
RecursiveMutex(const char *name);
~RecursiveMutex();
void lock();
void unlock();
private:
const char *name_;
pthread_mutex_t mutex_;
pthread_mutexattr_t attr_;
const char *locked_in_func_;
pid_t locked_by_pid_;
friend Lock;
};
struct Lock
{
Lock(RecursiveMutex *rmutex, const char *func_name);
~Lock();
private:
RecursiveMutex *rmutex_ {};
const char *func_name_;
};
struct Semaphore
{
Semaphore(const char *name);
~Semaphore();
bool wait();
void notify();
private:
const char *name_;
pthread_mutex_t mutex_;
pthread_cond_t condition_;
};
#endif