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/*============================================================================
WCSLIB 8.3 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2024, Mark Calabretta
This file is part of WCSLIB.
WCSLIB 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.
WCSLIB 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id$
*=============================================================================
*
* twcs_pthread tests the thread safety of wcsset() when invoked explicitly
* from within multiple threads.
*
*---------------------------------------------------------------------------*/
#include<pthread.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include <wcs.h>
#include <wcserr.h>
#define NTHREAD 4
#define NPXPTHR 100000
#define NPIX NPXPTHR*NTHREAD
// Pixel-world-pixel closure tolerance.
const double TOL = 1e-8;
// Make these global as a convenient way to get them to the threads.
struct wcsprm wcs;
double pixcrd[2*NPIX];
double imgcrd[2*NPIX];
double phi[NPIX], theta[NPIX];
double world[2*NPIX];
int stat[NPIX];
double pixcrd2[2*NPIX];
pthread_t threadId[NTHREAD];
void *threadFn(void *ithread);
int threadRet[NTHREAD];
int main(void)
{
// Set for unbuffered output so messages are printed immediately.
setvbuf(stdout, NULL, _IONBF, 0);
printf("Testing wcsset() for thread safety (twcs_pthread.c)\n"
"---------------------------------------------------\n");
wcsinit(1, 2, &wcs, 0, 0, 0);
wcs.naxis = 2;
wcs.crpix[0] = -234.75;
wcs.crpix[1] = 8.3393;
wcs.cdelt[0] = -0.066667;
wcs.cdelt[1] = 0.066667;
wcs.crval[0] = 0.0;
wcs.crval[1] = -90.0;
sprintf(wcs.ctype[0], "RA---AIR");
sprintf(wcs.ctype[1], "DEC--AIR");
wcserr_enable(1);
// Set up the wcsprm struct. It only needs to be done once and normally
// that would be the end of it. However, threadFn() is going to call
// wcsset() repeatedly for testing purposes. Hence the struct is put into
// bypass mode by setting wcsprm::flag = 1. That will stop wcsset()
// altering it in one thread while it's being used by another.
wcs.flag = 1;
if (wcsset(&wcs)) {
wcsperr(&wcs, "");
}
// Set up an array of random pixels.
const double min = -1000.0;
const double max = 1000.0;
unsigned int seed = 292364782;
for (int i = 0; i < 2*NPIX; ) {
double r;
r = (double)rand_r(&seed) / (double)RAND_MAX;
pixcrd[i++] = min + r*(max - min);
r = (double)rand_r(&seed) / (double)RAND_MAX;
pixcrd[i++] = min + r*(max - min);
}
int threadArg[NTHREAD];
for (int iloop = 0; iloop < 10; iloop++) {
// Launch multiple threads working on the pixel array.
for (int ithread = 0; ithread < NTHREAD; ithread++) {
threadArg[ithread] = ithread;
int status;
if ((status = pthread_create(&(threadId[ithread]), NULL, &threadFn,
threadArg+ithread))) {
printf("Failed to create thread %d: %s", ithread, strerror(status));
}
}
// Wait for each thread to finish.
int iFail = 0;
for (int ithread = 0; ithread < NTHREAD; ithread++) {
pthread_join(threadId[ithread], NULL);
iFail += threadRet[ithread];
}
printf("Iteration %d: got %d closure errors.\n", iloop, iFail);
}
return 0;
}
//----------------------------------------------------------------------------
// Invoke wcsset(), wcsp2x(), and wcsx2p() in a thread.
//----------------------------------------------------------------------------
void *threadFn(void *threadArg)
{
int ithread = *(int *)threadArg;
// Compute offsets into the 1-D and 2-D arrays for this thread.
int off1 = ithread * NPXPTHR;
int off2 = off1 * 2;
// Pixel to world coordinates.
if (wcsp2s(&wcs, NPXPTHR, 2, pixcrd+off2, imgcrd+off2, phi+off1, theta+off1,
world+off2, stat+off1)) {
wcsperr(&wcs, "");
}
// Invoke wcsset(). This is unnecessary and undesirable - do not write code
// like this! It is done to test thread-safety in situations where it can't
// be avoided, such as may occur when WCSLIB is wrapped by another language.
if (wcsset(&wcs)) {
wcsperr(&wcs, "");
}
// World to pixel coordinates.
if (wcss2p(&wcs, NPXPTHR, 2, world+off2, phi+off1, theta+off1, imgcrd+off2,
pixcrd2+off2, stat+off1)) {
wcsperr(&wcs, "");
}
// Check closure.
int *iFailp = threadRet + ithread;
*iFailp = 0;
double tol2 = TOL*TOL;
for (int i = off2; i < off2 + 2*NPXPTHR; i++) {
double r = pixcrd2[i] - pixcrd[i];
double resid = r*r;
i++;
r = pixcrd2[i] - pixcrd[i];
resid += r*r;
if (resid > tol2) {
(*iFailp)++;
}
}
// Terminate the thread.
pthread_exit(NULL);
}
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