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#ifndef AWS_COMMON_RW_LOCK_H
#define AWS_COMMON_RW_LOCK_H
/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/common.h>
#ifdef _WIN32
/* NOTE: Do not use this macro before including windows.h */
# define AWSSRW_TO_WINDOWS(pCV) (PSRWLOCK) pCV
#else
# include <pthread.h>
#endif
AWS_PUSH_SANE_WARNING_LEVEL
struct aws_rw_lock {
#ifdef _WIN32
void *lock_handle;
#else
pthread_rwlock_t lock_handle;
#endif
};
#ifdef _WIN32
# define AWS_RW_LOCK_INIT \
{ .lock_handle = NULL }
#else
# define AWS_RW_LOCK_INIT \
{ .lock_handle = PTHREAD_RWLOCK_INITIALIZER }
#endif
AWS_EXTERN_C_BEGIN
/**
* Initializes a new platform instance of mutex.
*/
AWS_COMMON_API int aws_rw_lock_init(struct aws_rw_lock *lock);
/**
* Cleans up internal resources.
*/
AWS_COMMON_API void aws_rw_lock_clean_up(struct aws_rw_lock *lock);
/**
* Blocks until it acquires the lock. While on some platforms such as Windows,
* this may behave as a reentrant mutex, you should not treat it like one. On
* platforms it is possible for it to be non-reentrant, it will be.
*/
AWS_COMMON_API int aws_rw_lock_rlock(struct aws_rw_lock *lock);
AWS_COMMON_API int aws_rw_lock_wlock(struct aws_rw_lock *lock);
/**
* Attempts to acquire the lock but returns immediately if it can not.
* While on some platforms such as Windows, this may behave as a reentrant mutex,
* you should not treat it like one. On platforms it is possible for it to be non-reentrant, it will be.
* Note: For windows, minimum support server version is Windows Server 2008 R2 [desktop apps | UWP apps]
*/
AWS_COMMON_API int aws_rw_lock_try_rlock(struct aws_rw_lock *lock);
AWS_COMMON_API int aws_rw_lock_try_wlock(struct aws_rw_lock *lock);
/**
* Releases the lock.
*/
AWS_COMMON_API int aws_rw_lock_runlock(struct aws_rw_lock *lock);
AWS_COMMON_API int aws_rw_lock_wunlock(struct aws_rw_lock *lock);
AWS_EXTERN_C_END
AWS_POP_SANE_WARNING_LEVEL
#endif /* AWS_COMMON_RW_LOCK_H */
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