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/*============================================================================
WCSLIB 7.12 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2022, 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: tpthreads.c,v 7.12 2022/09/09 04:57:58 mcalabre Exp $
*=============================================================================
*
* tpthreads tests the thread safety of wcspih(), the WCS FITS parser for image
* headers. It closely follows tpih1.c, launching multiple threads in rapid
* succession to read a test header.
*
* Input comes from file "pih.fits" read directly using fgets().
*
*---------------------------------------------------------------------------*/
#include <wcsconfig_tests.h>
#include<pthread.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include <wcshdr.h>
#define NTHREAD 8
pthread_t threadId[NTHREAD];
void *threadFn(void *threadarg);
struct threadArg {
char *header;
int nkeyrec;
int relax;
int ctrl;
};
struct threadRet {
int status;
int nreject;
int nwcs;
struct wcsprm *wcs;
} threadret[NTHREAD];
int main(void)
{
char infile[] = "pih.fits";
int nkeyrec = 0;
// Set for unbuffered output so messages are printed immediately.
setvbuf(stdout, NULL, _IONBF, 0);
printf("Testing WCSLIB header parser for thread safety (tpthreads.c)\n"
"------------------------------------------------------------\n\n");
// Read in the FITS header, excluding COMMENT and HISTORY keyrecords.
FILE *fptr;
if ((fptr = fopen(infile, "r")) == 0) {
fprintf(stderr, "ERROR opening %s\n", infile);
return 1;
}
char keyrec[81], header[288001];
int k = 0;
int gotend = 0;
for (int iblock = 0; iblock < 100; iblock++) {
for (int ikeyrec = 0; ikeyrec < 36; ikeyrec++) {
if (fgets(keyrec, 81, fptr) == 0) {
break;
}
// Cull COMMENT and HISTORY keyrecords.
if (strncmp(keyrec, " ", 8) == 0) continue;
if (strncmp(keyrec, "COMMENT ", 8) == 0) continue;
if (strncmp(keyrec, "HISTORY ", 8) == 0) continue;
memcpy(header+k, keyrec, 80);
k += 80;
nkeyrec++;
if (strncmp(keyrec, "END ", 8) == 0) {
// An END keyrecord was read, but read the rest of the block.
gotend = 1;
}
}
if (gotend) break;
}
fclose(fptr);
fprintf(stderr, "Found %d non-comment header keyrecords.\n\n", nkeyrec);
// The threadArg struct contains constant data shared by all threads.
struct threadArg threadarg = {header, nkeyrec, WCSHDR_all, 0};
for (int iloop = 0; iloop < 10; iloop++) {
printf("\nPass %d:\n", iloop);
// Launch multiple threads parsing the same header.
for (int ithread = 0; ithread < NTHREAD; ithread++) {
printf("Thread %d...\n", ithread);
int status;
if ((status = pthread_create(&(threadId[ithread]), NULL, &threadFn,
&threadarg))) {
printf("Failed to create thread %d: %s", ithread, strerror(status));
} else {
printf("Thread %d created successfully.\n", ithread);
}
}
// Wait for each thread to finish.
for (int ithread = 0; ithread < NTHREAD; ithread++) {
struct threadRet *ret;
pthread_join(threadId[ithread], (void**)&ret);
printf("Thread %d status return: %d.\n", ithread, ret->status);
// Free memory allocated by wcspih().
wcsvfree(&ret->nwcs, &ret->wcs);
}
}
return 0;
}
/*----------------------------------------------------------------------------
* Invoke wcspih() in a thread.
----------------------------------------------------------------------------*/
void *threadFn(void *threadarg)
{
// Determine our thread index.
pthread_t selfId = pthread_self();
int ithread;
for (ithread = 0; ithread < NTHREAD; ithread++) {
if (pthread_equal(selfId, threadId[ithread])) {
break;
}
}
printf("Thread %d processing started.\n", ithread);
// Invoke wcspih().
struct threadArg *arg = (struct threadArg *)threadarg;
struct threadRet *ret = threadret + ithread;
ret->status = wcspih(arg->header, arg->nkeyrec, arg->relax, arg->ctrl,
&ret->nreject, &ret->nwcs, &ret->wcs);
// Terminate the thread.
printf("Thread %d processing finished.\n", ithread);
pthread_exit(ret);
return NULL;
}
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