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/******************************************************************************
*
* Project: GDAL
* Purpose: Test multi-threaded reprojection
* Author: Even Rouault, <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2010, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include <assert.h>
#include "cpl_string.h"
#include "cpl_atomic_ops.h"
#include "cpl_multiproc.h"
#include "ogr_spatialref.h"
double *padfRefX = nullptr;
double *padfRefY = nullptr;
double *padfRefResultX = nullptr;
double *padfRefResultY = nullptr;
OGRCoordinateTransformation *poCT = nullptr;
volatile int nIter = 0;
bool bCreateCTInThread = false;
OGRSpatialReference oSrcSRS;
OGRSpatialReference oDstSRS;
int nCountIter = 10000;
static void ReprojFunc(void * /* unused */)
{
double *padfResultX =
static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
double *padfResultY =
static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
OGRCoordinateTransformation *poCTInThread;
if (!bCreateCTInThread)
poCTInThread = poCT;
while (true)
{
if (bCreateCTInThread)
poCTInThread =
OGRCreateCoordinateTransformation(&oSrcSRS, &oDstSRS);
CPLAtomicInc(&nIter);
memcpy(padfResultX, padfRefX, 1024 * sizeof(double));
memcpy(padfResultY, padfRefY, 1024 * sizeof(double));
poCT->Transform(1024, padfResultX, padfResultY, nullptr, nullptr);
/* Check that the results are consistent with the reference results */
assert(memcmp(padfResultX, padfRefResultX, 1024 * sizeof(double)) == 0);
assert(memcmp(padfResultY, padfRefResultY, 1024 * sizeof(double)) == 0);
if (bCreateCTInThread)
OGRCoordinateTransformation::DestroyCT(poCTInThread);
}
}
int main(int argc, char *argv[])
{
int nThreads = 2;
for (int i = 0; i < argc; i++)
{
if (EQUAL(argv[i], "-threads") && i + 1 < argc)
nThreads = atoi(argv[++i]);
else if (EQUAL(argv[i], "-iter") && i + 1 < argc)
nCountIter = atoi(argv[++i]);
else if (EQUAL(argv[i], "-createctinthread"))
bCreateCTInThread = true;
}
oSrcSRS.importFromEPSG(4326);
oSrcSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
oDstSRS.importFromEPSG(32631);
oDstSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
poCT = OGRCreateCoordinateTransformation(&oSrcSRS, &oDstSRS);
if (poCT == nullptr)
return -1;
padfRefX = static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
padfRefY = static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
padfRefResultX = static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
padfRefResultY = static_cast<double *>(CPLMalloc(1024 * sizeof(double)));
for (int i = 0; i < 1024; i++)
{
padfRefX[i] = 2 + i / 1024.;
padfRefY[i] = 49 + i / 1024.;
}
memcpy(padfRefResultX, padfRefX, 1024 * sizeof(double));
memcpy(padfRefResultY, padfRefY, 1024 * sizeof(double));
poCT->Transform(1024, padfRefResultX, padfRefResultY, nullptr, nullptr);
for (int i = 0; i < nThreads; i++)
CPLCreateThread(ReprojFunc, nullptr);
while (nIter < nCountIter)
CPLSleep(0.001);
return 0;
}
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