/usr/include/ncbi-vdb/kproc/lock.h is in libncbi-vdb-dev 2.8.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/
#ifndef _h_kproc_lock_
#define _h_kproc_lock_
#ifndef _h_kproc_extern_
#include <kproc/extern.h>
#endif
#ifndef _h_klib_defs_
#include <klib/defs.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*--------------------------------------------------------------------------
* forwards
*/
struct timeout_t;
/*--------------------------------------------------------------------------
* KLock
* KTimedLock
* a POSIX-style mutual exclusion lock
*
* Mac/BSD doesn't supply proper support for timed pthread_mutex,
* so we have to provide additional structure to support it.
* in doing so, the timed version has become incompatible with
* the KCondition interface.
*
* For reasons given above, we are dividing KLock into two classes
* to separate out support for timed acquire.
*/
typedef struct KLock KLock;
typedef struct KTimedLock KTimedLock;
/* Make
* make a simple mutex
*/
KPROC_EXTERN rc_t CC KLockMake ( KLock **lock );
KPROC_EXTERN rc_t CC KTimedLockMake ( KTimedLock **lock );
/* AddRef
* Release
*/
KPROC_EXTERN rc_t CC KLockAddRef ( const KLock *self );
KPROC_EXTERN rc_t CC KLockRelease ( const KLock *self );
KPROC_EXTERN rc_t CC KTimedLockAddRef ( const KTimedLock *self );
KPROC_EXTERN rc_t CC KTimedLockRelease ( const KTimedLock *self );
/* Acquire
* acquires lock
*
* a NULL "tm" parameter should mean infinite
*/
KPROC_EXTERN rc_t CC KLockAcquire ( KLock *self );
KPROC_EXTERN rc_t CC KTimedLockAcquire ( KTimedLock *self, struct timeout_t *tm );
/* Unlock
* releases lock
*/
KPROC_EXTERN rc_t CC KLockUnlock ( KLock *self );
KPROC_EXTERN rc_t CC KTimedLockUnlock ( KTimedLock *self );
/*--------------------------------------------------------------------------
* KRWLock
* a POSIX-style read/write lock
*/
typedef struct KRWLock KRWLock;
/* Make
* make a simple read/write lock
*/
KPROC_EXTERN rc_t CC KRWLockMake ( KRWLock **lock );
/* AddRef
* Release
*/
KPROC_EXTERN rc_t CC KRWLockAddRef ( const KRWLock *self );
KPROC_EXTERN rc_t CC KRWLockRelease ( const KRWLock *self );
/* AcquireShared
* acquires read ( shared ) lock
*
* a NULL "tm" parameter should mean infinite
*/
KPROC_EXTERN rc_t CC KRWLockAcquireShared ( KRWLock *self );
KPROC_EXTERN rc_t CC KRWLockTimedAcquireShared ( KRWLock *self, struct timeout_t *tm );
/* AcquireExcl
* acquires write ( exclusive ) lock
*
* a NULL "tm" parameter should mean infinite
*/
KPROC_EXTERN rc_t CC KRWLockAcquireExcl ( KRWLock *self );
KPROC_EXTERN rc_t CC KRWLockTimedAcquireExcl ( KRWLock *self, struct timeout_t *tm );
/* Unlock
* releases lock
*/
KPROC_EXTERN rc_t CC KRWLockUnlock ( KRWLock *self );
#ifdef __cplusplus
}
#endif
#endif /* _h_kproc_lock_ */
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