mirror of
https://github.com/kanjitalk755/macemu.git
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144 lines
2.7 KiB
C++
144 lines
2.7 KiB
C++
/*
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* posix_sem.cpp - POSIX.4 semaphores "emulation"
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* Copyright (C) 1999 Orlando Bassotto
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*
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* Basilisk II (C) 1997-2008 Christian Bauer
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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; either version 2 of the License, or
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* (at your option) any later version.
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* OK, I had really big problems with SysV semaphores :/
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* I rewrote those one giving a look to the source of linuxthreads
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* with mutex. Seems to be working correctly now.
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <pthread.h>
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#include "semaphore.h"
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extern "C" {
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int sem_init(sem_t* sem, int pshared, unsigned int value)
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{
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if(sem==NULL||value>SEM_VALUE_MAX) {
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errno = EINVAL;
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return -1;
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}
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if(pshared) {
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errno = ENOSYS;
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return -1;
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}
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pthread_mutex_init(&sem->sem_lock, NULL);
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sem->sem_value = value;
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sem->sem_waiting = 0;
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return 0;
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}
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int sem_destroy(sem_t* sem)
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{
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if(sem==NULL) {
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errno = EINVAL;
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return -1;
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}
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if(sem->sem_waiting) {
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errno = EBUSY;
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return -1;
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}
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pthread_mutex_destroy(&sem->sem_lock);
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sem->sem_waiting = 0;
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sem->sem_value = 0;
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return 0;
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}
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sem_t sem_open(const char* name, int oflag, ...)
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{
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errno = ENOSYS;
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return *(sem_t*)NULL;
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}
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int sem_close(sem_t* sem)
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{
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errno = ENOSYS;
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return -1;
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}
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int sem_unlink(const char* name)
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{
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errno = ENOSYS;
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return -1;
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}
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int sem_wait(sem_t* sem)
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{
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struct timespec req = { 1, 0 };
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if(sem==NULL) {
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errno = EINVAL;
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return -1;
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}
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pthread_mutex_lock(&sem->sem_lock);
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sem->sem_waiting++;
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if(sem->sem_value > 0) {
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--sem->sem_value;
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return 0;
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}
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while(!sem->sem_value) nanosleep(NULL, &req);
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pthread_mutex_unlock(&sem->sem_lock);
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return 0;
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}
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int sem_trywait(sem_t* sem)
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{
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errno = ENOSYS;
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return -1;
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}
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int sem_post(sem_t* sem)
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{
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if(sem==NULL) {
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errno = EINVAL;
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return -1;
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}
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if(!sem->sem_waiting) {
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if(sem->sem_value >= SEM_VALUE_MAX) {
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errno = ERANGE;
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pthread_mutex_unlock(&sem->sem_lock);
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return -1;
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}
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++sem->sem_value;
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pthread_mutex_unlock(&sem->sem_lock);
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}
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else {
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sem->sem_waiting--;
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++sem->sem_value;
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// pthread_mutex_unlock(&sem->sem_lock);
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}
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return 0;
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}
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int sem_getvalue(sem_t* sem, int* sval)
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{
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errno = ENOSYS;
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return -1;
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}
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}
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