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+/* $Id: thread.c,v 1.1 2004/03/19 06:37:47 reinelt Exp $
+ *
+ * thread handling (mutex, shmem, ...)
+ *
+ * Copyright 2004 Michael Reinelt <reinelt@eunet.at>
+ * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * parts of this code are based on the old XWindow driver which is
+ * Copyright 2000 Herbert Rosmanith <herp@wildsau.idv.uni-linz.ac.at>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux 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 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: thread.c,v $
+ * Revision 1.1 2004/03/19 06:37:47 reinelt
+ * asynchronous thread handling started
+ *
+ */
+
+/*
+ * exported functions:
+ *
+ * Fixme: document me!
+ *
+ */
+
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+
+#include "debug.h"
+#include "thread.h"
+
+
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif
+
+
+/* glibc 2.1 requires defining semun ourselves */
+#ifdef _SEM_SEMUN_UNDEFINED
+union semun {
+ int val;
+ struct semid_ds *buf;
+ unsigned short int *array;
+ struct seminfo *__buf;
+};
+#endif
+
+
+int mutex_create (void)
+{
+ int semid;
+ union semun semun;
+
+ semid = semget(IPC_PRIVATE, 1, 0);
+ if (semid == -1) {
+ error ("fatal error: semget() failed: %s", strerror(errno));
+ return -1;
+ }
+ semun.val = 1;
+ semctl(semid, 0, SETVAL, semun);
+
+ return semid;
+}
+
+
+void mutex_lock (int semid)
+{
+ struct sembuf sembuf;
+ sembuf.sem_num = 0;
+ sembuf.sem_op = -1;
+ sembuf.sem_flg = 0;
+ semop (semid, &sembuf, 1);
+}
+
+
+void mutex_unlock (int semid)
+{
+ struct sembuf sembuf;
+ sembuf.sem_num = 0;
+ sembuf.sem_op = 1;
+ sembuf.sem_flg = 0;
+ semop (semid, &sembuf, 1);
+}
+
+
+void mutex_destroy (int semid)
+{
+ union semun arg;
+ semctl(semid, 0, IPC_RMID, arg);
+}
+
+
+int shm_create (void **buffer, int size)
+{
+ int shmid;
+
+ shmid = shmget(IPC_PRIVATE, size, SHM_R|SHM_W);
+ if (shmid==-1) {
+ error ("fatal error: shmget() failed: %s", strerror(errno));
+ return -1;
+ }
+
+ *buffer = shmat(shmid, NULL, 0);
+ if (*buffer == NULL) {
+ error ("fatal error: shmat() failed: %s", strerror(errno));
+ return -1;
+ }
+
+ return shmid;
+}
+
+
+void shm_destroy (int shmid)
+{
+ shmctl(shmid, IPC_RMID, NULL);
+}
+
+
+int thread_create (void (*thread)(void))
+{
+ /*
+ ppid=getpid();
+
+ switch(async_updater_pid=fork()) {
+ case -1:
+ error ("X11: fork() failed: %s", strerror(errno));
+ return -1;
+
+ case 0:
+ async_update();
+ error ("X11: async_update failed");
+ kill(ppid,SIGTERM);
+ exit(-1);
+
+ default:
+ break;
+ }
+
+ signal(SIGCHLD,quit_updater);
+ atexit(quit_updater);
+ */
+ return 0;
+}