semaphore.h

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/* -*- C -*- */
/*
 * Copyright (c) 2012-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
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#pragma once

#ifndef __MOTR_LIB_SEMAPHORE_H__
#define __MOTR_LIB_SEMAPHORE_H__

#include "lib/types.h"
#include "lib/time.h"  /* m0_time_t */

#ifdef __KERNEL__
#  include "lib/linux_kernel/semaphore.h"
#else
#  include "lib/user_space/semaphore.h"
#endif

M0_INTERNAL int m0_semaphore_init(struct m0_semaphore *semaphore,
                                  unsigned value);
M0_INTERNAL void m0_semaphore_fini(struct m0_semaphore *semaphore);

M0_INTERNAL void m0_semaphore_down(struct m0_semaphore *semaphore);

M0_INTERNAL void m0_semaphore_up(struct m0_semaphore *semaphore);

M0_INTERNAL bool m0_semaphore_trydown(struct m0_semaphore *semaphore);

M0_INTERNAL void m0_semaphore_drain(struct m0_semaphore *semaphore);

M0_INTERNAL unsigned m0_semaphore_value(struct m0_semaphore *semaphore);

M0_INTERNAL bool m0_semaphore_timeddown(struct m0_semaphore *semaphore,
                                        const m0_time_t abs_timeout);

#endif /* __MOTR_LIB_SEMAPHORE_H__ */

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