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/*
* File: ErrorContext.cpp
* Author: Yavor Nikolov
*
* Created on 29 October 2011, 18:14
*/
#include "pbzip2.h"
#include "ErrorContext.h"
#include <cstring>
#include <cerrno>
namespace pbzip2
{
ErrorContext * ErrorContext::_instance = 0;
pthread_mutex_t ErrorContext::_err_ctx_mutex = PTHREAD_MUTEX_INITIALIZER;
ErrorContext * ErrorContext::getInstance()
{
pthread_mutex_lock( &_err_ctx_mutex );
if ( ErrorContext::_instance == NULL )
{
_instance = new(std::nothrow) ErrorContext;
if ( _instance == NULL )
{
fprintf( stderr, "pbzip2: *ERROR: Can't initialize error context - out of memory!\n" );
}
}
pthread_mutex_unlock( &_err_ctx_mutex );
return _instance;
}
void ErrorContext::printErrnoMsg( FILE * out, int err )
{
if ( err != 0 )
{
fprintf( out, "pbzip2: *ERROR: system call failed with errno=[%d: %s]!\n",
err, std::strerror( err ) );
}
}
void ErrorContext::syncPrintErrnoMsg( FILE * out, int err )
{
pthread_mutex_lock( &_err_ctx_mutex );
printErrnoMsg( out, err );
pthread_mutex_unlock( &_err_ctx_mutex );
}
void ErrorContext::printErrorMessages( FILE * out )
{
pthread_mutex_lock( &_err_ctx_mutex );
printErrnoMsg( out, _first_kernel_err_no );
printErrnoMsg( out, _last_kernel_err_no );
pthread_mutex_unlock( &_err_ctx_mutex );
}
void ErrorContext::saveError()
{
int newerr = errno;
pthread_mutex_lock( &_err_ctx_mutex );
if ( newerr != 0 )
{
int & err_ref = ( _first_kernel_err_no == 0 )
? _first_kernel_err_no
: _last_kernel_err_no;
err_ref = newerr;
}
_last_kernel_err_no = errno;
pthread_mutex_unlock( &_err_ctx_mutex );
}
void ErrorContext::reset()
{
pthread_mutex_lock( &_err_ctx_mutex );
_first_kernel_err_no = _last_kernel_err_no = 0;
pthread_mutex_unlock( &_err_ctx_mutex );
}
} // namespace pbzip2
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