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83 lines
2.3 KiB
C
Executable File
83 lines
2.3 KiB
C
Executable File
#ifndef AWS_COMMON_MUTEX_H
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#define AWS_COMMON_MUTEX_H
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/*
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* Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#include <aws/common/common.h>
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#ifdef _WIN32
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/* NOTE: Do not use this macro before including Windows.h */
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# define AWSMUTEX_TO_WINDOWS(pMutex) (PSRWLOCK) & (pMutex)->mutex_handle
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#else
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# include <pthread.h>
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#endif
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struct aws_mutex {
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#ifdef _WIN32
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void *mutex_handle;
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#else
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pthread_mutex_t mutex_handle;
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#endif
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bool initialized;
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};
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#ifdef _WIN32
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# define AWS_MUTEX_INIT \
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{ .mutex_handle = NULL, .initialized = true }
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#else
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# define AWS_MUTEX_INIT \
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{ .mutex_handle = PTHREAD_MUTEX_INITIALIZER, .initialized = true }
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#endif
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AWS_EXTERN_C_BEGIN
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/**
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* Initializes a new platform instance of mutex.
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*/
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AWS_COMMON_API
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int aws_mutex_init(struct aws_mutex *mutex);
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/**
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* Cleans up internal resources.
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*/
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AWS_COMMON_API
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void aws_mutex_clean_up(struct aws_mutex *mutex);
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/**
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* Blocks until it acquires the lock. While on some platforms such as Windows,
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* this may behave as a reentrant mutex, you should not treat it like one. On
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* platforms it is possible for it to be non-reentrant, it will be.
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*/
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AWS_COMMON_API
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int aws_mutex_lock(struct aws_mutex *mutex);
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/**
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* Attempts to acquire the lock but returns immediately if it can not.
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* While on some platforms such as Windows, this may behave as a reentrant mutex,
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* you should not treat it like one. On platforms it is possible for it to be non-reentrant, it will be.
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*/
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AWS_COMMON_API
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int aws_mutex_try_lock(struct aws_mutex *mutex);
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/**
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* Releases the lock.
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*/
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AWS_COMMON_API
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int aws_mutex_unlock(struct aws_mutex *mutex);
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AWS_EXTERN_C_END
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#endif /* AWS_COMMON_MUTEX_H */
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