72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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#ifndef AWS_COMMON_RW_LOCK_H
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#define AWS_COMMON_RW_LOCK_H
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/**
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0.
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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 AWSSRW_TO_WINDOWS(pCV) (PSRWLOCK) pCV
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#else
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# include <pthread.h>
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#endif
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AWS_PUSH_SANE_WARNING_LEVEL
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struct aws_rw_lock {
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#ifdef _WIN32
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void *lock_handle;
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#else
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pthread_rwlock_t lock_handle;
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#endif
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};
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#ifdef _WIN32
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# define AWS_RW_LOCK_INIT {.lock_handle = NULL}
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#else
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# define AWS_RW_LOCK_INIT {.lock_handle = PTHREAD_RWLOCK_INITIALIZER}
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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 int aws_rw_lock_init(struct aws_rw_lock *lock);
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/**
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* Cleans up internal resources.
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*/
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AWS_COMMON_API void aws_rw_lock_clean_up(struct aws_rw_lock *lock);
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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 int aws_rw_lock_rlock(struct aws_rw_lock *lock);
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AWS_COMMON_API int aws_rw_lock_wlock(struct aws_rw_lock *lock);
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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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* Note: For windows, minimum support server version is Windows Server 2008 R2 [desktop apps | UWP apps]
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*/
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AWS_COMMON_API int aws_rw_lock_try_rlock(struct aws_rw_lock *lock);
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AWS_COMMON_API int aws_rw_lock_try_wlock(struct aws_rw_lock *lock);
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/**
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* Releases the lock.
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*/
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AWS_COMMON_API int aws_rw_lock_runlock(struct aws_rw_lock *lock);
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AWS_COMMON_API int aws_rw_lock_wunlock(struct aws_rw_lock *lock);
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AWS_EXTERN_C_END
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AWS_POP_SANE_WARNING_LEVEL
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#endif /* AWS_COMMON_RW_LOCK_H */
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