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/***************************************************************
MPU-LOCK.C
This file contains public stream locking functions.
PART OF : MPUIO - library .
USAGE : External only .
NOTE : Stream locks are recursive, matching stdio
flockfile() ownership semantics.
Copyright (C) 2000 - 2026 by Andrey V.Kosteltsev.
All Rights Reserved.
***************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <libmpuio.h>
#include <mpu-symbols.h>
#include <mpu-libio.h>
/***************************************************************
Lock STREAM for exclusive use by the calling thread.
***************************************************************/
void mpu_flockfile( mpu_FILE *stream )
{
int ret;
if( !__mpu_IO_valid( stream ) )
return;
ret = pthread_mutex_lock( &stream->_lock );
if( ret != 0 )
errno = ret;
return;
} /* End of mpu_flockfile() */
/***************************************************************
Try to lock STREAM without waiting; return zero on success.
***************************************************************/
int mpu_ftrylockfile( mpu_FILE *stream )
{
int ret;
if( !__mpu_IO_valid( stream ) )
return( EINVAL );
ret = pthread_mutex_trylock( &stream->_lock );
if( ret != 0 )
errno = ret;
return( ret );
} /* End of mpu_ftrylockfile() */
/***************************************************************
Release one STREAM lock held by the calling thread.
***************************************************************/
void mpu_funlockfile( mpu_FILE *stream )
{
int ret;
if( !__mpu_IO_valid( stream ) )
return;
ret = pthread_mutex_unlock( &stream->_lock );
if( ret != 0 )
errno = ret;
return;
} /* End of mpu_funlockfile() */
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