kopia lustrzana https://github.com/weetmuts/wmbusmeters
119 wiersze
3.5 KiB
C++
119 wiersze
3.5 KiB
C++
/*
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Copyright (C) 2020 Fredrik Öhrström (gpl-3.0-or-later)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef THREADS_H
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#define THREADS_H
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#include "util.h"
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#include <assert.h>
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#include <errno.h>
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#include <functional>
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#include <pthread.h>
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#include <sys/types.h>
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#include <unistd.h>
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// Declare all threads and locks used in wmbusmeters!
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// When the main thread enters serial_manager->waitForStop()
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// this thread is recorded as the main thread. It will
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// now just sleep until its time for wmbusmeters to exit.
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pthread_t getMainThread();
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void recordMyselfAsMainThread();
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// The event loop thread runs the event loop and executes callbacks to file descriptor
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// listeners. This thread is used for all the important work:
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// Wmbus-dongle protocol decoding, followed by parsing of telegrams and eventually
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// updating and printing meter values and executing a subshell for mqtt.
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//
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// This thread is not allowed to send commands to the dongles or update
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// wmbus-devices or serial-devices, if it does, then wmbusmeters will deadlock,
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// since the callbacks are needed to execute the commands.
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pthread_t getEventLoopThread();
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void startEventLoopThread(std::function<void()> cb);
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// The timer callback thread runs whenever a timer timeout has happened.
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// This thread is used to probe for lost/found dongles, send commands to dongles,
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// reset dongles due to alarms, and generally monitor the system.
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pthread_t getTimerLoopThread();
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void startTimerLoopThread(std::function<void()> cb);
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size_t getPeakRSS();
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size_t getCurrentRSS();
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#define LOCK(module,func,x) { trace("[LOCKING] " #x " " func " (%s %d)\n", x ## func_, x ## pid_); \
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pthread_mutex_lock(&x); \
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x ## func_ = func; \
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x ## pid_ = getpid(); \
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trace("[LOCKED] " #x " " func "\n"); }
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#define UNLOCK(module,func,x) { trace("[UNLOCKING] " #x " " func " (%s %d) \n", x ## func_, x ## pid_); \
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pthread_mutex_unlock(&x); \
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x ## func_ = ""; \
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x ## pid_ = 0; \
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trace("[UNLOCKED] " #x " " func "\n"); }
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#define WITH(mutex,name,func) Lock local_ ## name (&mutex, #func)
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struct Lock;
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struct RecursiveMutex
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{
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RecursiveMutex(const char *name);
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~RecursiveMutex();
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void lock();
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void unlock();
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private:
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const char *name_;
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pthread_mutex_t mutex_;
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pthread_mutexattr_t attr_;
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const char *locked_in_func_;
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pid_t locked_by_pid_;
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friend Lock;
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};
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struct Lock
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{
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Lock(RecursiveMutex *rmutex, const char *func_name);
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~Lock();
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private:
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RecursiveMutex *rmutex_ {};
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const char *func_name_;
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};
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struct Semaphore
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{
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Semaphore(const char *name);
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~Semaphore();
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bool wait();
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void notify();
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private:
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const char *name_;
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pthread_mutex_t mutex_;
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pthread_cond_t condition_;
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};
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#endif
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