101 lines
3.1 KiB
C++
101 lines
3.1 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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#include "thread.h"
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#include <assert.h>
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#include <limits.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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namespace rgb_matrix {
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void *Thread::PthreadCallRun(void *tobject) {
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reinterpret_cast<Thread*>(tobject)->Run();
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return NULL;
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}
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Thread::Thread() : started_(false) {}
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Thread::~Thread() {
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WaitStopped();
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}
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void Thread::WaitStopped() {
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if (!started_) return;
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int result = pthread_join(thread_, NULL);
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if (result != 0) {
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perror("Issue joining thread");
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}
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started_ = false;
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}
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void Thread::Start(int priority, uint32_t affinity_mask) {
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assert(!started_); // Did you call WaitStopped() ?
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pthread_create(&thread_, NULL, &PthreadCallRun, this);
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int err;
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if (priority > 0) {
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struct sched_param p;
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p.sched_priority = priority;
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if ((err = pthread_setschedparam(thread_, SCHED_FIFO, &p))) {
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char buffer[PATH_MAX];
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const char *bin = realpath("/proc/self/exe", buffer); // Linux specific.
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fprintf(stderr, "Can't set realtime thread priority=%d: %s.\n"
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"\tYou are probably not running as root ?\n"
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"\tThis will seriously mess with color stability and flicker\n"
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"\tof the matrix. Please run as `root` (e.g. by invoking this\n"
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"\tprogram with `sudo`), or setting the capability on this\n"
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"\tbinary by calling\n"
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"\tsudo setcap 'cap_sys_nice=eip' %s\n",
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p.sched_priority, strerror(err), bin ? bin : "<this binary>");
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}
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}
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if (affinity_mask != 0) {
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cpu_set_t cpu_mask;
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CPU_ZERO(&cpu_mask);
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for (int i = 0; i < 32; ++i) {
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if ((affinity_mask & (1<<i)) != 0) {
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CPU_SET(i, &cpu_mask);
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}
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}
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if ((err=pthread_setaffinity_np(thread_, sizeof(cpu_mask), &cpu_mask))) {
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// On a Pi1, this won't work as there is only one core. Don't worry in
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// that case.
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}
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}
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started_ = true;
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}
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bool Mutex::WaitOn(pthread_cond_t *cond, long timeout_ms) {
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if (timeout_ms < 0) {
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pthread_cond_wait(cond, &mutex_);
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return true;
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}
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else {
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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t.tv_sec += timeout_ms / 1000;
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t.tv_nsec += (timeout_ms % 1000) * 1000000;
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t.tv_sec += t.tv_nsec / 1000000000;
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t.tv_nsec %= 1000000000;
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// TODO(hzeller): It doesn't seem we return with EINTR on signal. We should.
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return pthread_cond_timedwait(cond, &mutex_, &t) == 0;
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}
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}
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} // namespace rgb_matrix
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