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cpl_multiproc.cpp
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cpl_multiproc.cpp
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/**********************************************************************
* $Id: cpl_multiproc.cpp,v 1.19 2006/03/02 11:31:35 dron Exp $
*
* Project: CPL - Common Portability Library
* Purpose: CPL Multi-Threading, and process handling portability functions.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
**********************************************************************
* Copyright (c) 2002, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
**********************************************************************
*
* $Log: cpl_multiproc.cpp,v $
* Revision 1.19 2006/03/02 11:31:35 dron
* CPLCreateOrAcquireMutex() should return a value.
*
* Revision 1.18 2006/02/19 21:54:34 mloskot
* [WINCE] Changes related to Windows CE port of CPL. Most changes are #ifdef wrappers.
*
* Revision 1.17 2006/01/25 19:52:25 fwarmerdam
* default to avoiding as much mutex overhead as opposed if MUTEX_NONE defined
*
* Revision 1.16 2005/08/31 01:00:51 fwarmerdam
* Fixed assert limits.
*
* Revision 1.15 2005/08/24 21:51:06 fwarmerdam
* added CPLCleanupTLS
*
* Revision 1.14 2005/08/01 18:58:42 fwarmerdam
* Fixed problem with _NP mutex initializer.
*
* Revision 1.13 2005/07/31 02:14:49 fwarmerdam
* improved recursive mutex creation for pthreads, works on macosx now
*
* Revision 1.12 2005/07/18 15:34:11 fwarmerdam
* Fixed papTLSList sizing.
*
* Revision 1.11 2005/07/08 18:17:52 fwarmerdam
* complete TLS implementation for win32
*
* Revision 1.10 2005/07/08 16:30:25 fwarmerdam
* real implementation of TLS for pthreads
*
* Revision 1.9 2005/07/08 14:35:26 fwarmerdam
* preliminary TLS support
*
* Revision 1.8 2005/05/23 16:00:33 fwarmerdam
* Make sure that stub implementation of mutex support recursive holds.
*
* Revision 1.7 2005/05/23 06:40:40 fwarmerdam
* fixed flaw in CPLCreateOrAcquireMutex, added mutex holder
*
* Revision 1.6 2005/05/20 19:19:00 fwarmerdam
* added CPLCreateOrAcquireMutex()
*
* Revision 1.5 2005/04/26 20:52:10 fwarmerdam
* use a typedef type for thread mains (for Sun port)
*
* Revision 1.4 2003/05/06 18:30:54 warmerda
* fix unix createmutex to implicitly acquire it
*
* Revision 1.3 2003/04/23 04:36:54 warmerda
* pthreads based implementation
*
* Revision 1.2 2002/07/11 19:36:34 warmerda
* CPLCreateMutex() should implicitly acquire it, fix stub version
*
* Revision 1.1 2002/05/24 04:01:01 warmerda
* New
*
**********************************************************************/
#include "cpl_multiproc.h"
#include "cpl_conv.h"
#if !defined(WIN32CE)
# include <time.h>
#else
# include <wce_time.h>
#endif
CPL_CVSID("$Id: cpl_multiproc.cpp,v 1.19 2006/03/02 11:31:35 dron Exp $");
#if defined(CPL_MULTIPROC_STUB) && !defined(DEBUG)
# define MUTEX_NONE
#endif
/************************************************************************/
/* CPLMutexHolder() */
/************************************************************************/
CPLMutexHolder::CPLMutexHolder( void **phMutex, double dfWaitInSeconds,
const char *pszFileIn,
int nLineIn )
{
#ifndef MUTEX_NONE
pszFile = pszFileIn;
nLine = nLineIn;
#ifdef DEBUG_MUTEX
CPLDebug( "MH", "Request %p for pid %d at %d/%s",
*phMutex, CPLGetPID(), nLine, pszFile );
#endif
if( !CPLCreateOrAcquireMutex( phMutex, dfWaitInSeconds ) )
{
CPLDebug( "CPLMutexHolder", "failed to acquire mutex!" );
hMutex = NULL;
}
else
{
#ifdef DEBUG_MUTEX
CPLDebug( "MH", "Acquired %p for pid %d at %d/%s",
*phMutex, CPLGetPID(), nLine, pszFile );
#endif
hMutex = *phMutex;
}
#endif /* ndef MUTEX_NONE */
}
/************************************************************************/
/* ~CPLMutexHolder() */
/************************************************************************/
CPLMutexHolder::~CPLMutexHolder()
{
#ifndef MUTEX_NONE
if( hMutex != NULL )
{
#ifdef DEBUG_MUTEX
CPLDebug( "MH", "Release %p for pid %d at %d/%s",
hMutex, CPLGetPID(), nLine, pszFile );
#endif
CPLReleaseMutex( hMutex );
}
#endif /* ndef MUTEX_NONE */
}
/************************************************************************/
/* CPLCreateOrAcquireMutex() */
/************************************************************************/
int CPLCreateOrAcquireMutex( void **phMutex, double dfWaitInSeconds )
{
#ifndef MUTEX_NONE
static void *hCOAMutex = NULL;
/*
** ironically, creation of this initial mutex is not threadsafe
** even though we use it to ensure that creation of other mutexes
** is threadsafe.
*/
if( hCOAMutex == NULL )
{
hCOAMutex = CPLCreateMutex();
}
else
{
CPLAcquireMutex( hCOAMutex, dfWaitInSeconds );
}
if( *phMutex == NULL )
{
*phMutex = CPLCreateMutex();
CPLReleaseMutex( hCOAMutex );
return TRUE;
}
else
{
CPLReleaseMutex( hCOAMutex );
int bSuccess = CPLAcquireMutex( *phMutex, dfWaitInSeconds );
return bSuccess;
}
#endif /* ndef MUTEX_NONE */
return TRUE;
}
/************************************************************************/
/* CPLCleanupTLSList() */
/* */
/* Free resources associated with a TLS vector (implementation */
/* independent). */
/************************************************************************/
static void CPLCleanupTLSList( void **papTLSList )
{
int i;
// printf( "CPLCleanupTLSList(%p)\n", papTLSList );
if( papTLSList == NULL )
return;
for( i = 0; i < CTLS_MAX; i++ )
{
if( papTLSList[i] != NULL && papTLSList[i+CTLS_MAX] != NULL )
{
CPLFree( papTLSList[i] );
}
}
CPLFree( papTLSList );
}
#ifdef CPL_MULTIPROC_STUB
/************************************************************************/
/* ==================================================================== */
/* CPL_MULTIPROC_STUB */
/* */
/* Stub implementation. Mutexes don't provide exclusion, file */
/* locking is achieved with extra "lock files", and thread */
/* creation doesn't work. The PID is always just one. */
/* ==================================================================== */
/************************************************************************/
/************************************************************************/
/* CPLGetThreadingModel() */
/************************************************************************/
const char *CPLGetThreadingModel()
{
return "stub";
}
/************************************************************************/
/* CPLCreateMutex() */
/************************************************************************/
void *CPLCreateMutex()
{
#ifndef MUTEX_NONE
unsigned char *pabyMutex = (unsigned char *) CPLMalloc( 4 );
pabyMutex[0] = 1;
pabyMutex[1] = 'r';
pabyMutex[2] = 'e';
pabyMutex[3] = 'd';
return (void *) pabyMutex;
#else
return (void *) 0xdeadbeef;
#endif
}
/************************************************************************/
/* CPLAcquireMutex() */
/************************************************************************/
int CPLAcquireMutex( void *hMutex, double dfWaitInSeconds )
{
#ifndef MUTEX_NONE
unsigned char *pabyMutex = (unsigned char *) hMutex;
CPLAssert( pabyMutex[1] == 'r' && pabyMutex[2] == 'e'
&& pabyMutex[3] == 'd' );
pabyMutex[0] += 1;
return TRUE;
#else
return TRUE;
#endif
}
/************************************************************************/
/* CPLReleaseMutex() */
/************************************************************************/
void CPLReleaseMutex( void *hMutex )
{
#ifndef MUTEX_NONE
unsigned char *pabyMutex = (unsigned char *) hMutex;
CPLAssert( pabyMutex[1] == 'r' && pabyMutex[2] == 'e'
&& pabyMutex[3] == 'd' );
if( pabyMutex[0] < 1 )
CPLDebug( "CPLMultiProc",
"CPLReleaseMutex() called on mutex with %d as ref count!",
pabyMutex[0] );
pabyMutex[0] -= 1;
#endif
}
/************************************************************************/
/* CPLDestroyMutex() */
/************************************************************************/
void CPLDestroyMutex( void *hMutex )
{
#ifndef MUTEX_NONE
unsigned char *pabyMutex = (unsigned char *) hMutex;
CPLAssert( pabyMutex[1] == 'r' && pabyMutex[2] == 'e'
&& pabyMutex[3] == 'd' );
CPLFree( pabyMutex );
#endif
}
/************************************************************************/
/* CPLLockFile() */
/* */
/* Lock a file. This implementation has a terrible race */
/* condition. If we don't succeed in opening the lock file, we */
/* assume we can create one and own the target file, but other */
/* processes might easily try creating the target file at the */
/* same time, overlapping us. Death! Mayhem! The traditional */
/* solution is to use open() with _O_CREAT|_O_EXCL but this */
/* function and these arguments aren't trivially portable. */
/* Also, this still leaves a race condition on NFS drivers */
/* (apparently). */
/************************************************************************/
void *CPLLockFile( const char *pszPath, double dfWaitInSeconds )
{
FILE *fpLock;
char *pszLockFilename;
/* -------------------------------------------------------------------- */
/* We use a lock file with a name derived from the file we want */
/* to lock to represent the file being locked. Note that for */
/* the stub implementation the target file does not even need */
/* to exist to be locked. */
/* -------------------------------------------------------------------- */
pszLockFilename = (char *) CPLMalloc(strlen(pszPath) + 30);
sprintf( pszLockFilename, "%s.lock", pszPath );
fpLock = fopen( pszLockFilename, "r" );
while( fpLock != NULL && dfWaitInSeconds > 0.0 )
{
fclose( fpLock );
CPLSleep( MIN(dfWaitInSeconds,0.5) );
dfWaitInSeconds -= 0.5;
fpLock = fopen( pszLockFilename, "r" );
}
if( fpLock != NULL )
{
fclose( fpLock );
CPLFree( pszLockFilename );
return NULL;
}
fpLock = fopen( pszLockFilename, "w" );
if( fpLock == NULL )
{
CPLFree( pszLockFilename );
return NULL;
}
fwrite( "held\n", 1, 5, fpLock );
fclose( fpLock );
return pszLockFilename;
}
/************************************************************************/
/* CPLUnlockFile() */
/************************************************************************/
void CPLUnlockFile( void *hLock )
{
char *pszLockFilename = (char *) hLock;
if( hLock == NULL )
return;
VSIUnlink( pszLockFilename );
CPLFree( pszLockFilename );
}
/************************************************************************/
/* CPLGetPID() */
/************************************************************************/
int CPLGetPID()
{
return 1;
}
/************************************************************************/
/* CPLCreateThread(); */
/************************************************************************/
int CPLCreateThread( CPLThreadFunc pfnMain, void *pArg )
{
return -1;
}
/************************************************************************/
/* CPLSleep() */
/************************************************************************/
void CPLSleep( double dfWaitInSeconds )
{
time_t ltime;
time_t ttime;
time( <ime );
ttime = ltime + (int) (dfWaitInSeconds+0.5);
for( ; ltime < ttime; time(<ime) )
{
/* currently we just busy wait. Perhaps we could at least block on
io? */
}
}
/************************************************************************/
/* CPLGetTLSList() */
/************************************************************************/
static void **papTLSList = NULL;
static void **CPLGetTLSList()
{
if( papTLSList == NULL )
papTLSList = (void **) CPLCalloc(sizeof(void*),CTLS_MAX*2);
return papTLSList;
}
/************************************************************************/
/* CPLCleanupTLS() */
/************************************************************************/
void CPLCleanupTLS()
{
CPLCleanupTLSList( papTLSList );
papTLSList = NULL;
}
#endif /* def CPL_MULTIPROC_STUB */
#if defined(CPL_MULTIPROC_WIN32)
/************************************************************************/
/* ==================================================================== */
/* CPL_MULTIPROC_WIN32 */
/* */
/* WIN32 Implementation of multiprocessing functions. */
/* ==================================================================== */
/************************************************************************/
#include <windows.h>
/* windows.h header must be included above following lines. */
#if defined(WIN32CE)
# include "cpl_win32ce_api.h"
# define TLS_OUT_OF_INDEXES ((DWORD)0xFFFFFFFF)
#endif
/************************************************************************/
/* CPLGetThreadingModel() */
/************************************************************************/
const char *CPLGetThreadingModel()
{
return "win32";
}
/************************************************************************/
/* CPLCreateMutex() */
/************************************************************************/
void *CPLCreateMutex()
{
HANDLE hMutex;
hMutex = CreateMutex( NULL, TRUE, NULL );
return (void *) hMutex;
}
/************************************************************************/
/* CPLAcquireMutex() */
/************************************************************************/
int CPLAcquireMutex( void *hMutexIn, double dfWaitInSeconds )
{
HANDLE hMutex = (HANDLE) hMutexIn;
DWORD hr;
hr = WaitForSingleObject( hMutex, (int) (dfWaitInSeconds * 1000) );
return hr != WAIT_TIMEOUT;
}
/************************************************************************/
/* CPLReleaseMutex() */
/************************************************************************/
void CPLReleaseMutex( void *hMutexIn )
{
HANDLE hMutex = (HANDLE) hMutexIn;
ReleaseMutex( hMutex );
}
/************************************************************************/
/* CPLDestroyMutex() */
/************************************************************************/
void CPLDestroyMutex( void *hMutexIn )
{
HANDLE hMutex = (HANDLE) hMutexIn;
CloseHandle( hMutex );
}
/************************************************************************/
/* CPLLockFile() */
/************************************************************************/
void *CPLLockFile( const char *pszPath, double dfWaitInSeconds )
{
char *pszLockFilename;
HANDLE hLockFile;
pszLockFilename = (char *) CPLMalloc(strlen(pszPath) + 30);
sprintf( pszLockFilename, "%s.lock", pszPath );
hLockFile =
CreateFile( pszLockFilename, GENERIC_WRITE, 0, NULL,CREATE_NEW,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_DELETE_ON_CLOSE, NULL );
while( GetLastError() == ERROR_ALREADY_EXISTS
&& dfWaitInSeconds > 0.0 )
{
CloseHandle( hLockFile );
CPLSleep( MIN(dfWaitInSeconds,0.125) );
dfWaitInSeconds -= 0.125;
hLockFile =
CreateFile( pszLockFilename, GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_DELETE_ON_CLOSE,
NULL );
}
CPLFree( pszLockFilename );
if( hLockFile == INVALID_HANDLE_VALUE )
return NULL;
if( GetLastError() == ERROR_ALREADY_EXISTS )
{
CloseHandle( hLockFile );
return NULL;
}
return (void *) hLockFile;
}
/************************************************************************/
/* CPLUnlockFile() */
/************************************************************************/
void CPLUnlockFile( void *hLock )
{
HANDLE hLockFile = (HANDLE) hLock;
CloseHandle( hLockFile );
}
/************************************************************************/
/* CPLGetPID() */
/************************************************************************/
int CPLGetPID()
{
return GetCurrentThreadId();
}
/************************************************************************/
/* CPLStdCallThreadJacket() */
/************************************************************************/
typedef struct {
void *pAppData;
CPLThreadFunc pfnMain;
} CPLStdCallThreadInfo;
static DWORD WINAPI CPLStdCallThreadJacket( void *pData )
{
CPLStdCallThreadInfo *psInfo = (CPLStdCallThreadInfo *) pData;
psInfo->pfnMain( psInfo->pAppData );
CPLFree( psInfo );
return 0;
}
/************************************************************************/
/* CPLCreateThread() */
/* */
/* The WIN32 CreateThread() call requires an entry point that */
/* has __stdcall conventions, so we provide a jacket function */
/* to supply that. */
/************************************************************************/
int CPLCreateThread( CPLThreadFunc pfnMain, void *pThreadArg )
{
HANDLE hThread;
DWORD nThreadId;
CPLStdCallThreadInfo *psInfo;
psInfo = (CPLStdCallThreadInfo*) CPLCalloc(sizeof(CPLStdCallThreadInfo),1);
psInfo->pAppData = pThreadArg;
psInfo->pfnMain = pfnMain;
hThread = CreateThread( NULL, 0, CPLStdCallThreadJacket, psInfo,
0, &nThreadId );
if( hThread == NULL )
return -1;
CloseHandle( hThread );
return nThreadId;
}
/************************************************************************/
/* CPLSleep() */
/************************************************************************/
void CPLSleep( double dfWaitInSeconds )
{
Sleep( (DWORD) (dfWaitInSeconds * 1000.0) );
}
static int bTLSKeySetup = FALSE;
static DWORD nTLSKey;
/************************************************************************/
/* CPLGetTLSList() */
/************************************************************************/
static void **CPLGetTLSList()
{
void **papTLSList;
if( !bTLSKeySetup )
{
nTLSKey = TlsAlloc();
if( nTLSKey == TLS_OUT_OF_INDEXES )
{
CPLError( CE_Fatal, CPLE_AppDefined,
"TlsAlloc() failed!" );
}
bTLSKeySetup = TRUE;
}
papTLSList = (void **) TlsGetValue( nTLSKey );
if( papTLSList == NULL )
{
papTLSList = (void **) CPLCalloc(sizeof(void*),CTLS_MAX*2);
if( TlsSetValue( nTLSKey, papTLSList ) == 0 )
{
CPLError( CE_Fatal, CPLE_AppDefined,
"TlsSetValue() failed!" );
}
}
return papTLSList;
}
/************************************************************************/
/* CPLCleanupTLS() */
/************************************************************************/
void CPLCleanupTLS()
{
void **papTLSList;
if( !bTLSKeySetup )
return;
papTLSList = (void **) TlsGetValue( nTLSKey );
if( papTLSList == NULL )
return;
TlsSetValue( nTLSKey, NULL );
CPLCleanupTLSList( papTLSList );
}
#endif /* def CPL_MULTIPROC_WIN32 */
#ifdef CPL_MULTIPROC_PTHREAD
#include <pthread.h>
#include <time.h>
/************************************************************************/
/* ==================================================================== */
/* CPL_MULTIPROC_PTHREAD */
/* */
/* PTHREAD Implementation of multiprocessing functions. */
/* ==================================================================== */
/************************************************************************/
/************************************************************************/
/* CPLGetThreadingModel() */
/************************************************************************/
const char *CPLGetThreadingModel()
{
return "pthread";
}
/************************************************************************/
/* CPLCreateMutex() */
/************************************************************************/
void *CPLCreateMutex()
{
pthread_mutex_t *hMutex;
hMutex = (pthread_mutex_t *) malloc(sizeof(pthread_mutex_t));
#if defined(PTHREAD_MUTEX_RECURSIVE)
{
pthread_mutexattr_t attr;
pthread_mutexattr_init( &attr );
pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
pthread_mutex_init( hMutex, &attr );
}
#elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
pthread_mutex_t tmp_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
*hMutex = tmp_mutex;
#else
#error "Recursive mutexes apparently unsupported, configure --without-threads"
#endif
// mutexes are implicitly acquired when created.
CPLAcquireMutex( hMutex, 0.0 );
return (void *) hMutex;
}
/************************************************************************/
/* CPLAcquireMutex() */
/************************************************************************/
int CPLAcquireMutex( void *hMutexIn, double dfWaitInSeconds )
{
int err;
/* we need to add timeout support */
err = pthread_mutex_lock( (pthread_mutex_t *) hMutexIn );
if( err != 0 )
{
if( err == EDEADLK )
CPLDebug( "CPLAcquireMutex", "Error = %d/EDEADLK", err );
else
CPLDebug( "CPLAcquireMutex", "Error = %d", err );
return FALSE;
}
return TRUE;
}
/************************************************************************/
/* CPLReleaseMutex() */
/************************************************************************/
void CPLReleaseMutex( void *hMutexIn )
{
pthread_mutex_unlock( (pthread_mutex_t *) hMutexIn );
}
/************************************************************************/
/* CPLDestroyMutex() */
/************************************************************************/
void CPLDestroyMutex( void *hMutexIn )
{
pthread_mutex_destroy( (pthread_mutex_t *) hMutexIn );
CPLFree( hMutexIn );
}
/************************************************************************/
/* CPLLockFile() */
/************************************************************************/
void *CPLLockFile( const char *pszPath, double dfWaitInSeconds )
{
CPLError( CE_Failure, CPLE_NotSupported,
"PThreads CPLLockFile() not implemented yet." );
return NULL;
}
/************************************************************************/
/* CPLUnlockFile() */
/************************************************************************/
void CPLUnlockFile( void *hLock )
{
}
/************************************************************************/
/* CPLGetPID() */
/************************************************************************/
int CPLGetPID()
{
return (int) pthread_self();
}
/************************************************************************/
/* CPLStdCallThreadJacket() */
/************************************************************************/
typedef struct {
void *pAppData;
CPLThreadFunc pfnMain;
pthread_t hThread;
} CPLStdCallThreadInfo;
static void *CPLStdCallThreadJacket( void *pData )
{
CPLStdCallThreadInfo *psInfo = (CPLStdCallThreadInfo *) pData;
psInfo->pfnMain( psInfo->pAppData );
CPLFree( psInfo );
return NULL;
}
/************************************************************************/
/* CPLCreateThread() */
/* */
/* The WIN32 CreateThread() call requires an entry point that */
/* has __stdcall conventions, so we provide a jacket function */
/* to supply that. */
/************************************************************************/
int CPLCreateThread( CPLThreadFunc pfnMain, void *pThreadArg )
{
CPLStdCallThreadInfo *psInfo;
pthread_attr_t hThreadAttr;
psInfo = (CPLStdCallThreadInfo*) CPLCalloc(sizeof(CPLStdCallThreadInfo),1);
psInfo->pAppData = pThreadArg;
psInfo->pfnMain = pfnMain;
pthread_attr_init( &hThreadAttr );
pthread_attr_setdetachstate( &hThreadAttr, PTHREAD_CREATE_DETACHED );
if( pthread_create( &(psInfo->hThread), &hThreadAttr,
CPLStdCallThreadJacket, (void *) psInfo ) != 0 )
{
CPLFree( psInfo );
return -1;
}
return 1; /* can we return the actual thread pid? */
}
/************************************************************************/
/* CPLSleep() */
/************************************************************************/
void CPLSleep( double dfWaitInSeconds )
{
struct timespec sRequest, sRemain;
sRequest.tv_sec = (int) floor(dfWaitInSeconds);
sRequest.tv_nsec = (int) ((dfWaitInSeconds - sRequest.tv_sec)*1000000000);
nanosleep( &sRequest, &sRemain );
}
static int bTLSKeySetup = FALSE;
static pthread_key_t oTLSKey;
/************************************************************************/
/* CPLCleanupTLS() */
/************************************************************************/
void CPLCleanupTLS()
{
void **papTLSList;
if( !bTLSKeySetup )
return;
papTLSList = (void **) pthread_getspecific( oTLSKey );
if( papTLSList == NULL )
return;
pthread_setspecific( oTLSKey, NULL );
CPLCleanupTLSList( papTLSList );
}
/************************************************************************/
/* CPLGetTLSList() */
/************************************************************************/
static void **CPLGetTLSList()
{
void **papTLSList;
if( !bTLSKeySetup )
{
if( pthread_key_create( &oTLSKey,
(void (*)(void*)) CPLCleanupTLSList ) != 0 )
{
CPLError( CE_Fatal, CPLE_AppDefined,
"pthread_key_create() failed!" );
}
bTLSKeySetup = TRUE;
}
papTLSList = (void **) pthread_getspecific( oTLSKey );
if( papTLSList == NULL )
{
papTLSList = (void **) CPLCalloc(sizeof(void*),CTLS_MAX*2);
if( pthread_setspecific( oTLSKey, papTLSList ) != 0 )
{
CPLError( CE_Fatal, CPLE_AppDefined,
"pthread_setspecific() failed!" );
}
}