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87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Copyright (C) 2013 Henner Zeller <h.zeller@acm.org>
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//
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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 version 2.
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//
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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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//
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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://gnu.org/licenses/gpl-2.0.txt>
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#ifndef RPI_THREAD_H
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#define RPI_THREAD_H
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#include <stdint.h>
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#include <pthread.h>
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namespace rgb_matrix {
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// Simple thread abstraction.
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class Thread {
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public:
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Thread();
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// The destructor waits for Run() to return so make sure it does.
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virtual ~Thread();
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// Wait for the Run() method to return.
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void WaitStopped();
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// Start thread. If realtime_priority is > 0, then this will be a
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// thread with SCHED_FIFO and the given priority.
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// If cpu_affinity is set !=, chooses the given bitmask of CPUs
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// this thread should have an affinity to.
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// On a Raspberry Pi 1, this doesn't matter, as there is only one core,
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// Raspberry Pi 2 can has 4 cores, so any combination of (1<<0) .. (1<<3) is
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// valid.
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virtual void Start(int realtime_priority = 0, uint32_t cpu_affinity_mask = 0);
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// Override this to do the work.
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//
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// This will be called in a thread once Start() has been called. You typically
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// will have an endless loop doing stuff.
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//
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// It is a good idea to provide a way to communicate to the thread that
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// it should stop (see ThreadedCanvasManipulator for an example)
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virtual void Run() = 0;
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private:
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static void *PthreadCallRun(void *tobject);
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bool started_;
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pthread_t thread_;
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};
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// Non-recursive Mutex.
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class Mutex {
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public:
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Mutex() { pthread_mutex_init(&mutex_, NULL); }
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~Mutex() { pthread_mutex_destroy(&mutex_); }
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void Lock() { pthread_mutex_lock(&mutex_); }
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void Unlock() { pthread_mutex_unlock(&mutex_); }
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// Wait on condition. If "timeout_ms" is < 0, it waits forever, otherwise
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// until timeout is reached.
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// Returns 'true' if condition is met, 'false', if wait timed out.
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bool WaitOn(pthread_cond_t *cond, long timeout_ms = -1);
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private:
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pthread_mutex_t mutex_;
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};
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// Useful RAII wrapper around mutex.
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class MutexLock {
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public:
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MutexLock(Mutex *m) : mutex_(m) { mutex_->Lock(); }
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~MutexLock() { mutex_->Unlock(); }
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private:
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Mutex *const mutex_;
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};
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} // end namespace rgb_matrix
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#endif // RPI_THREAD_H
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