monolithium/kernel/include/sync.h

/*
 * sync.h
 * 
 * Copyright (C) 2015 Aleksandar Andrejevic <theflash@sdf.lonestar.org>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _SYNC_H_
#define _SYNC_H_

#include <common.h>
#include <object.h>

#define NO_TIMEOUT 0xFFFFFFFF

#define init_mutex(m, i) init_semaphore((m), (i), 1)
#define wait_mutex(m, t) wait_semaphore((m), 1, (t))
#define release_mutex(m) release_semaphore((m), 1)

typedef volatile uintptr_t lock_t;
typedef volatile uintptr_t resource_t;

typedef struct
{
    object_t header;
    dword_t count;
    dword_t max_count;
} semaphore_t, mutex_t;

void acquire_lock(lock_t *lock);
void release_lock(lock_t *lock);
void acquire_resource_shared(resource_t *res);
void acquire_resource_exclusive(resource_t *res);
void release_resource(resource_t *res);
void init_semaphore(semaphore_t *semaphore, dword_t init_count, dword_t max_count);
dword_t create_semaphore(const char *name, dword_t init_count, dword_t max_count, handle_t *handle);
dword_t open_semaphore(const char *name, handle_t *handle);
dword_t wait_semaphore(semaphore_t *semaphore, dword_t count, dword_t timeout);
dword_t release_semaphore(semaphore_t *semaphore, dword_t count);
dword_t wait_semaphore_by_handle(handle_t semaphore, dword_t count, dword_t timeout);
dword_t release_semaphore_by_handle(handle_t semaphore, dword_t count);

#endif