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|
/*
* Read/Write lock functions
*
* Copyright (C) 2012-2018, Joachim Metz <joachim.metz@gmail.com>
*
* Refer to AUTHORS for acknowledgements.
*
* This software is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <memory.h>
#include <types.h>
#include <errno.h>
#if defined( WINAPI ) && ( WINVER >= 0x0602 )
#include <Synchapi.h>
#endif
#if defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
#include <pthread.h>
#endif
#include "libcthreads_libcerror.h"
#include "libcthreads_read_write_lock.h"
#include "libcthreads_types.h"
#if !defined( HAVE_LOCAL_LIBCTHREADS ) || defined( HAVE_MULTI_THREAD_SUPPORT )
/* Creates a read/write lock
* Make sure the value read_write_lock is referencing, is set to NULL
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_initialize(
libcthreads_read_write_lock_t **read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_initialize";
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DWORD error_code = 0;
#elif defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
if( *read_write_lock != NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,
"%s: invalid read/write lock value already set.",
function );
return( -1 );
}
internal_read_write_lock = memory_allocate_structure(
libcthreads_internal_read_write_lock_t );
if( internal_read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_INSUFFICIENT,
"%s: unable to create read/write lock.",
function );
goto on_error;
}
if( memory_set(
internal_read_write_lock,
0,
sizeof( libcthreads_internal_read_write_lock_t ) ) == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_SET_FAILED,
"%s: unable to clear read/write lock.",
function );
memory_free(
internal_read_write_lock );
return( -1 );
}
#if defined( WINAPI ) && ( WINVER >= 0x0600 )
InitializeSRWLock(
&( internal_read_write_lock->slim_read_write_lock ) );
#elif defined( WINAPI ) && ( WINVER >= 0x0400 )
InitializeCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
InitializeCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
internal_read_write_lock->no_read_event_handle = CreateEvent(
NULL,
TRUE,
TRUE,
NULL );
if( internal_read_write_lock->no_read_event_handle == NULL )
{
error_code = GetLastError();
libcerror_system_set_error(
error,
error_code,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,
"%s: unable to initialize no read event handle.",
function );
goto on_error;
}
#elif defined( WINAPI )
#error libcthreads_read_write_lock_initialize for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_init(
&( internal_read_write_lock->read_write_lock ),
NULL );
switch( pthread_result )
{
case 0:
break;
case EAGAIN:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to initialize read/write lock with error: Insufficient resources.",
function );
goto on_error;
default:
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to initialize read/write lock.",
function );
goto on_error;
}
#endif
*read_write_lock = (libcthreads_read_write_lock_t *) internal_read_write_lock;
return( 1 );
on_error:
if( internal_read_write_lock != NULL )
{
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DeleteCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
DeleteCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
#endif
memory_free(
internal_read_write_lock );
}
return( -1 );
}
/* Frees a read/write lock
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_free(
libcthreads_read_write_lock_t **read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_free";
int result = 1;
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DWORD error_code = 0;
#elif defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
if( *read_write_lock != NULL )
{
internal_read_write_lock = (libcthreads_internal_read_write_lock_t *) *read_write_lock;
*read_write_lock = NULL;
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
if( CloseHandle(
internal_read_write_lock->no_read_event_handle ) == 0 )
{
error_code = GetLastError();
libcerror_system_set_error(
error,
error_code,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to free no read event handle.",
function );
result = -1;
}
DeleteCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
DeleteCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
#elif defined( WINAPI ) && ( WINVER < 0x0400 )
#error libcthreads_read_write_lock_free for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_destroy(
&( internal_read_write_lock->read_write_lock ) );
switch( pthread_result )
{
case 0:
break;
case EAGAIN:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to destroy read/write lock with error: Insufficient resources.",
function );
result = -1;
break;
case EBUSY:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to destroy read/write lock with error: Resource busy.",
function );
result = -1;
break;
default:
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to destroy read/write lock.",
function );
result = -1;
break;
}
#endif
memory_free(
internal_read_write_lock );
}
return( result );
}
/* Grabs a read/write lock for reading
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_grab_for_read(
libcthreads_read_write_lock_t *read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_grab_for_read";
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DWORD error_code = 0;
BOOL result = 0;
#elif defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
internal_read_write_lock = (libcthreads_internal_read_write_lock_t *) read_write_lock;
#if defined( WINAPI ) && ( WINVER >= 0x0600 )
AcquireSRWLockShared(
&( internal_read_write_lock->slim_read_write_lock ) );
#elif defined( WINAPI ) && ( WINVER >= 0x0400 )
EnterCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
EnterCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
internal_read_write_lock->number_of_readers++;
if( internal_read_write_lock->number_of_readers == 1 )
{
result = ResetEvent(
internal_read_write_lock->no_read_event_handle );
if( result == 0 )
{
error_code = GetLastError();
internal_read_write_lock->number_of_readers--;
}
}
else
{
result = 1;
}
LeaveCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
LeaveCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
if( result == 0 )
{
libcerror_system_set_error(
error,
error_code,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: reset of no read event failed.",
function );
return( -1 );
}
#elif defined( WINAPI )
#error libcthreads_read_write_lock_grab_for_read for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_rdlock(
&( internal_read_write_lock->read_write_lock ) );
switch( pthread_result )
{
case 0:
break;
case EAGAIN:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to lock read/write lock for read with error: Maximum number of locks exceeded.",
function );
return( -1 );
case EDEADLK:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to lock read/write lock for read with error: Deadlock condition detected.",
function );
return( -1 );
default:
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to lock read/write lock for read.",
function );
return( -1 );
}
#endif
return( 1 );
}
/* Grabs a read/write lock for writing
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_grab_for_write(
libcthreads_read_write_lock_t *read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_grab_for_write";
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DWORD error_code = 0;
DWORD wait_status = 0;
#elif defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
internal_read_write_lock = (libcthreads_internal_read_write_lock_t *) read_write_lock;
#if defined( WINAPI ) && ( WINVER >= 0x0600 )
AcquireSRWLockExclusive(
&( internal_read_write_lock->slim_read_write_lock ) );
#elif defined( WINAPI ) && ( WINVER >= 0x0400 )
EnterCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
wait_status = WaitForSingleObject(
internal_read_write_lock->no_read_event_handle,
INFINITE );
if( wait_status == WAIT_FAILED )
{
error_code = GetLastError();
LeaveCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
libcerror_system_set_error(
error,
error_code,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: wait for no read event handle failed.",
function );
return( -1 );
}
#elif defined( WINAPI )
#error libcthreads_read_write_lock_grab_for_write for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_wrlock(
&( internal_read_write_lock->read_write_lock ) );
switch( pthread_result )
{
case 0:
break;
case EDEADLK:
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to lock read/write lock for write with error: Deadlock condition detected.",
function );
return( -1 );
default:
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
"%s: unable to lock read/write lock for write.",
function );
return( -1 );
}
#endif
return( 1 );
}
/* Releases a read/write lock for reading
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_release_for_read(
libcthreads_read_write_lock_t *read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_release_for_read";
#if defined( WINAPI ) && ( WINVER >= 0x0400 ) && ( WINVER < 0x0600 )
DWORD error_code = 0;
BOOL result = 0;
#elif defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
internal_read_write_lock = (libcthreads_internal_read_write_lock_t *) read_write_lock;
#if defined( WINAPI ) && ( WINVER >= 0x0600 )
ReleaseSRWLockShared(
&( internal_read_write_lock->slim_read_write_lock ) );
#elif defined( WINAPI ) && ( WINVER >= 0x0400 )
EnterCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
internal_read_write_lock->number_of_readers--;
if( internal_read_write_lock->number_of_readers == 0 )
{
result = SetEvent(
internal_read_write_lock->no_read_event_handle );
if( result == 0 )
{
error_code = GetLastError();
internal_read_write_lock->number_of_readers++;
}
}
else
{
result = 1;
}
LeaveCriticalSection(
&( internal_read_write_lock->read_critical_section ) );
if( result == 0 )
{
libcerror_system_set_error(
error,
error_code,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: set of no read event failed.",
function );
return( -1 );
}
#elif defined( WINAPI )
#error libcthreads_read_write_lock_release_for_read for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_unlock(
&( internal_read_write_lock->read_write_lock ) );
if( pthread_result != 0 )
{
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to unlock read/write lock.",
function );
return( -1 );
}
#endif
return( 1 );
}
/* Releases a read/write lock for writing
* Returns 1 if successful or -1 on error
*/
int libcthreads_read_write_lock_release_for_write(
libcthreads_read_write_lock_t *read_write_lock,
libcerror_error_t **error )
{
libcthreads_internal_read_write_lock_t *internal_read_write_lock = NULL;
static char *function = "libcthreads_read_write_lock_release_for_write";
#if defined( HAVE_PTHREAD_H ) && !defined( WINAPI )
int pthread_result = 0;
#endif
if( read_write_lock == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid read/write lock.",
function );
return( -1 );
}
internal_read_write_lock = (libcthreads_internal_read_write_lock_t *) read_write_lock;
#if defined( WINAPI ) && ( WINVER >= 0x0600 )
ReleaseSRWLockExclusive(
&( internal_read_write_lock->slim_read_write_lock ) );
#elif defined( WINAPI ) && ( WINVER >= 0x0400 )
LeaveCriticalSection(
&( internal_read_write_lock->write_critical_section ) );
#elif defined( WINAPI )
#error libcthreads_read_write_lock_release_for_write for Windows earlier than NT4 not implemented
#elif defined( HAVE_PTHREAD_H )
pthread_result = pthread_rwlock_unlock(
&( internal_read_write_lock->read_write_lock ) );
if( pthread_result != 0 )
{
libcerror_system_set_error(
error,
pthread_result,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to unlock read/write lock.",
function );
return( -1 );
}
#endif
return( 1 );
}
#endif /* !defined( HAVE_LOCAL_LIBCTHREADS ) || defined( HAVE_MULTI_THREAD_SUPPORT ) */
|
