101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
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/* src/thr-linux.c: Thread functions for Linux
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Copyright 2010 Andrew Church
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This file is part of Yabause.
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Yabause 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 2 of the License, or
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(at your option) any later version.
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Yabause 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 Yabause; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "core.h"
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#include "threads.h"
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <unistd.h>
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//////////////////////////////////////////////////////////////////////////////
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// Thread handles for each Yabause subthread
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static pthread_t thread_handle[YAB_NUM_THREADS];
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//////////////////////////////////////////////////////////////////////////////
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static void dummy_sighandler(int signum_unused) {} // For thread sleep/wake
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int YabThreadStart(unsigned int id, void (*func)(void))
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{
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// Set up a dummy signal handler for SIGUSR1 so we can return from pause()
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// in YabThreadSleep()
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static const struct sigaction sa = {.sa_handler = dummy_sighandler};
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if (sigaction(SIGUSR1, &sa, NULL) != 0)
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{
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perror("sigaction(SIGUSR1)");
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return -1;
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}
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if (thread_handle[id])
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{
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fprintf(stderr, "YabThreadStart: thread %u is already started!\n", id);
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return -1;
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}
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if ((errno = pthread_create(&thread_handle[id], NULL, (void *)func, NULL)) != 0)
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{
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perror("pthread_create");
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return -1;
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}
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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void YabThreadWait(unsigned int id)
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{
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if (!thread_handle[id])
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return; // Thread wasn't running in the first place
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pthread_join(thread_handle[id], NULL);
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thread_handle[id] = 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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void YabThreadYield(void)
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{
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sched_yield();
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}
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//////////////////////////////////////////////////////////////////////////////
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void YabThreadSleep(void)
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{
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pause();
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}
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//////////////////////////////////////////////////////////////////////////////
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void YabThreadWake(unsigned int id)
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{
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if (!thread_handle[id])
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return; // Thread isn't running
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pthread_kill(thread_handle[id], SIGUSR1);
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}
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//////////////////////////////////////////////////////////////////////////////
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