indexamajig.c

/*
 * indexamajig.c
 *
 * Find hits, index patterns, output hkl+intensity etc.
 *
 * (c) 2006-2010 Thomas White <taw@physics.org>
 *
 * Part of CrystFEL - crystallography with a FEL
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <hdf5.h>
#include <gsl/gsl_errno.h>
#include <pthread.h>
#include <sys/time.h>

#include "utils.h"
#include "hdf5-file.h"
#include "index.h"
#include "peaks.h"
#include "diffraction.h"
#include "diffraction-gpu.h"
#include "detector.h"
#include "sfac.h"
#include "filters.h"
#include "reflections.h"


#define MAX_THREADS (96)


enum {
	PEAK_ZAEF,
	PEAK_HDF5,
};


struct process_args
{
	/* Input */
	char *filename;
	int id;
	pthread_mutex_t *gpu_mutex;     /* Protects "gctx" */
	UnitCell *cell;
	int config_cmfilter;
	int config_noisefilter;
	int config_writedrx;
	int config_dumpfound;
	int config_verbose;
	int config_alternate;
	int config_nearbragg;
	int config_gpu;
	int config_simulate;
	int config_nomatch;
	int config_polar;
	int config_sanity;
	int config_satcorr;
	int config_sa;
	int config_closer;
	float threshold;
	struct detector *det;
	IndexingMethod indm;
	IndexingPrivate *ipriv;
	const double *intensities;
	struct gpu_context *gctx;
	int peaks;

	/* Thread control and output */
	pthread_mutex_t control_mutex;  /* Protects the scary stuff below */
	int start;
	int finish;
	int done;
	int indexable;
	int sane;

	/* Output stream */
	pthread_mutex_t *output_mutex;  /* Protects the output stream */
	FILE *ofh;
};


static void show_help(const char *s)
{
	printf("Syntax: %s [options]\n\n", s);
	printf(
"Process and index FEL diffraction images.\n"
"\n"
" -h, --help               Display this help message.\n"
"\n"
" -i, --input=<filename>   Specify file containing list of images to process.\n"
"                           '-' means stdin, which is the default.\n"
"\n"
"     --indexing=<method>  Use 'method' for indexing.  Choose from:\n"
"                           none     : no indexing (default)\n"
"                           dirax    : invoke DirAx\n"
"                           template : index by template matching\n"
" -g. --geometry=<file>    Get detector geometry from file.\n"
" -p, --pdb=<file>         PDB file from which to get the unit cell to match.\n"
"                           Default: 'molecule.pdb'.\n"
" -x, --prefix=<p>         Prefix filenames from input file with <p>.\n"
"     --peaks=<method>     Use 'method' for finding peaks.  Choose from:\n"
"                           zaef  : Use Zaefferer (2000) gradient detection.\n"
"                                    This is the default method.\n"
"                           hdf5  : Get from /processing/hitfinder/peakinfo\n"
"                                    in the HDF5 file.\n"
"\n"
"\nWith just the above options, this program does not do much of practical use."
"\nYou should also enable some of the following:\n\n"
"     --near-bragg         Output a list of reflection intensities to stdout.\n"
"                           When pixels with fractional indices within 0.1 of\n"
"                           integer values (the Bragg condition) are found,\n"
"                           the integral of pixels within a ten pixel radius\n"
"                           of the nearest-to-Bragg pixel will be reported as\n"
"                           the intensity.  The centroid of the pixels will\n"
"                           be given as the coordinates, as well as the h,k,l\n"
"                           (integer) indices of the reflection.  If a peak\n"
"                           was located by the initial peak search close to\n"
"                           the \"near Bragg\" location, its coordinates will\n"
"                           be taken as the centre instead.\n"
"     --simulate           Simulate the diffraction pattern using the indexed\n"
"                           unit cell.  The simulated pattern will be saved\n"
"                           as \"simulated.h5\".  You can TRY to combine this\n"
"                           with \"-j <n>\" with n greater than 1, but it's\n"
"                           not a good idea.\n"
"     --write-drx          Write 'xfel.drx' for visualisation of reciprocal\n"
"                           space.  Implied by any indexing method other than\n"
"                           'none'.  Beware: the units in this file are\n"
"                           reciprocal Angstroms.\n"
"     --dump-peaks         Write the results of the peak search to stdout.\n"
"                           The intensities in this list are from the\n"
"                           centroid/integration procedure.\n"
"\n"
"\nFor more control over the process, you might need:\n\n"
"     --no-match           Don't attempt to match the indexed cell to the\n"
"                           model, just proceed with the one generated by the\n"
"                           auto-indexing procedure.\n"
"     --check-sanity       Check that indexed locations approximately correspond\n"
"                           with detected peaks.\n"
"     --filter-cm          Perform common-mode noise subtraction on images\n"
"                           before proceeding.  Intensities will be extracted\n"
"                           from the image as it is after this processing.\n"
"     --filter-noise       Apply an aggressive noise filter which sets all\n"
"                           pixels in each 3x3 region to zero if any of them\n"
"                           have negative values.  Intensity measurement will\n"
"                           be performed on the image as it was before this.\n"
"     --unpolarized        Don't correct for the polarisation of the X-rays.\n"
"     --no-sat-corr        Don't correct values of saturated peaks using a\n"
"                           table included in the HDF5 file.\n"
"     --no-sa              Don't correct for the differing solid angles of\n"
"                           the pixels.\n"
"     --threshold=<n>      Only accept peaks above <n> ADU.  Default: 800.\n"
"\n"
"\nIf you used --simulate, you may also want:\n\n"
"     --intensities=<file> Specify file containing reflection intensities\n"
"                           to use when simulating.\n"
"\n"
"\nOptions for greater performance or verbosity:\n\n"
"     --verbose            Be verbose about indexing.\n"
"     --gpu                Use the GPU to speed up the simulation.\n"
" -j <n>                   Run <n> analyses in parallel.  Default 1.\n"
"\n"
"\nOptions you probably won't need:\n\n"
"     --no-check-prefix    Don't attempt to correct the --prefix.\n"
"     --no-closer-peak     Don't integrate from the location of a nearby peak\n"
"                           instead of the position closest to the reciprocal\n"
"                           lattice point.\n"
);
}


static struct image *get_simage(struct image *template, int alternate)
{
	struct image *image;
	struct panel panels[2];

	image = malloc(sizeof(*image));

	/* Simulate a diffraction pattern */
	image->twotheta = NULL;
	image->data = NULL;
	image->det = template->det;
	image->flags = NULL;
	image->f0_available = 0;
	image->f0 = 1.0;

	/* View head-on (unit cell is tilted) */
	image->orientation.w = 1.0;
	image->orientation.x = 0.0;
	image->orientation.y = 0.0;
	image->orientation.z = 0.0;

	/* Detector geometry for the simulation
	 * - not necessarily the same as the original. */
	image->width = 1024;
	image->height = 1024;
	image->det->n_panels = 2;

	if ( alternate ) {

		/* Upper */
		panels[0].min_x = 0;
		panels[0].max_x = 1023;
		panels[0].min_y = 512;
		panels[0].max_y = 1023;
		panels[0].cx = 523.6;
		panels[0].cy = 502.5;
		panels[0].clen = 56.4e-2;  /* 56.4 cm */
		panels[0].res = 13333.3;   /* 75 microns/pixel */

		/* Lower */
		panels[1].min_x = 0;
		panels[1].max_x = 1023;
		panels[1].min_y = 0;
		panels[1].max_y = 511;
		panels[1].cx = 520.8;
		panels[1].cy = 525.0;
		panels[1].clen = 56.7e-2;  /* 56.7 cm */
		panels[1].res = 13333.3;   /* 75 microns/pixel */

		image->det->panels = panels;

	} else {

		/* Copy pointer to old geometry */
		image->det->panels = template->det->panels;

	}

	image->lambda = ph_en_to_lambda(eV_to_J(1.8e3));
	image->features = template->features;
	image->filename = template->filename;
	image->indexed_cell = template->indexed_cell;
	image->f0 = template->f0;

	/* Prevent muppetry */
	image->hits = NULL;
	image->n_hits = 0;

	return image;
}


static void simulate_and_write(struct image *simage, struct gpu_context **gctx,
                               const double *intensities, UnitCell *cell)
{
	/* Set up GPU if necessary */
	if ( (gctx != NULL) && (*gctx == NULL) ) {
		*gctx = setup_gpu(0, simage, intensities);
	}

	if ( (gctx != NULL) && (*gctx != NULL) ) {
		get_diffraction_gpu(*gctx, simage, 24, 24, 40, cell);
	} else {
		get_diffraction(simage, 24, 24, 40,
		                intensities, NULL, cell, 0,
		                GRADIENT_MOSAIC);
	}
	record_image(simage, 0);

	hdf5_write("simulated.h5", simage->data, simage->width, simage->height,
		   H5T_NATIVE_FLOAT);
}


static void process_image(struct process_args *pargs)
{
	struct hdfile *hdfile;
	struct image image;
	struct image *simage;
	float *data_for_measurement;
	size_t data_size;
	char *filename = pargs->filename;
	UnitCell *cell = pargs->cell;
	int config_cmfilter = pargs->config_cmfilter;
	int config_noisefilter = pargs->config_noisefilter;
	int config_writedrx = pargs->config_writedrx;
	int config_dumpfound = pargs->config_dumpfound;
	int config_verbose = pargs->config_verbose;
	int config_alternate  = pargs->config_alternate;
	int config_nearbragg = pargs->config_nearbragg;
	int config_gpu = pargs->config_gpu;
	int config_simulate = pargs->config_simulate;
	int config_nomatch = pargs->config_nomatch;
	int config_polar = pargs->config_polar;
	IndexingMethod indm = pargs->indm;
	const double *intensities = pargs->intensities;
	struct gpu_context *gctx = pargs->gctx;

	image.features = NULL;
	image.data = NULL;
	image.indexed_cell = NULL;
	image.id = pargs->id;
	image.filename = filename;
	image.hits = NULL;
	image.n_hits = 0;
	image.det = pargs->det;

	/* View head-on (unit cell is tilted) */
	image.orientation.w = 1.0;
	image.orientation.x = 0.0;
	image.orientation.y = 0.0;
	image.orientation.z = 0.0;

	STATUS("Processing '%s'\n", image.filename);

	pargs->sane = 0;
	pargs->indexable = 0;

	hdfile = hdfile_open(filename);
	if ( hdfile == NULL ) {
		return;
	} else if ( hdfile_set_first_image(hdfile, "/") ) {
		ERROR("Couldn't select path\n");
		return;
	}

	hdf5_read(hdfile, &image, pargs->config_satcorr);

	if ( config_cmfilter ) {
		filter_cm(&image);
	}

	/* Take snapshot of image after CM subtraction but before
	 * the aggressive noise filter. */
	data_size = image.width*image.height*sizeof(float);
	data_for_measurement = malloc(data_size);

	if ( config_noisefilter ) {
		filter_noise(&image, data_for_measurement);
	} else {
		memcpy(data_for_measurement, image.data, data_size);
	}

	switch ( pargs->peaks )
	{
	case PEAK_HDF5 :
		/* Get peaks from HDF5 */
		if ( get_peaks(&image, hdfile) ) {
			ERROR("Failed to get peaks from HDF5 file.\n");
			return;
		}
		break;
	case PEAK_ZAEF :
		search_peaks(&image, pargs->threshold);
		break;
	}

	/* Get rid of noise-filtered version at this point
	 * - it was strictly for the purposes of peak detection. */
	free(image.data);
	image.data = data_for_measurement;

	if ( config_dumpfound ) {
		dump_peaks(&image, pargs->ofh, pargs->output_mutex);
	}

	/* Not indexing nor writing xfel.drx?
	 * Then there's nothing left to do. */
	if ( (!config_writedrx) && (indm == INDEXING_NONE) ) {
		goto done;
	}

	/* Calculate orientation matrix (by magic) */
	if ( config_writedrx || (indm != INDEXING_NONE) ) {
		index_pattern(&image, cell, indm, config_nomatch,
		              config_verbose, pargs->ipriv);
	}

	/* No cell at this point?  Then we're done. */
	if ( image.indexed_cell == NULL ) goto done;
	pargs->indexable = 1;

	/* Sanity check */
	if ( pargs->config_sanity
	  && !peak_sanity_check(&image, image.indexed_cell, 0, 0.1) ) {
		STATUS("Failed peak sanity check.\n");
		goto done;
	} else {
		pargs->sane = 1;
	}

	/* Measure intensities if requested */
	if ( config_nearbragg ) {
		output_intensities(&image, image.indexed_cell,
		                   pargs->output_mutex, config_polar,
		                   pargs->config_sa, pargs->config_closer,
		                   pargs->ofh, 0, 0.1);
	}

	simage = get_simage(&image, config_alternate);

	/* Simulate if requested */
	if ( config_simulate ) {
		if ( config_gpu ) {
			pthread_mutex_lock(pargs->gpu_mutex);
			simulate_and_write(simage, &gctx, intensities,
			                   image.indexed_cell);
			pthread_mutex_unlock(pargs->gpu_mutex);
		} else {
			simulate_and_write(simage, NULL, intensities,
			                   image.indexed_cell);
		}
	}

	/* Finished with alternate image */
	if ( simage->twotheta != NULL ) free(simage->twotheta);
	if ( simage->data != NULL ) free(simage->data);
	free(simage);

	/* Only free cell if found */
	cell_free(image.indexed_cell);

done:
	free(image.data);
	free(image.flags);
	image_feature_list_free(image.features);
	free(image.hits);
	hdfile_close(hdfile);
}


static void *worker_thread(void *pargsv)
{
	struct process_args *pargs = pargsv;
	int finish;

	do {

		int wakeup;

		process_image(pargs);

		pthread_mutex_lock(&pargs->control_mutex);
		pargs->done = 1;
		pargs->start = 0;
		pthread_mutex_unlock(&pargs->control_mutex);

		/* Go to sleep until told to exit or process next image */
		do {

			pthread_mutex_lock(&pargs->control_mutex);
			/* Either of these can result in the thread waking up */
			wakeup = pargs->start || pargs->finish;
			finish = pargs->finish;
			pthread_mutex_unlock(&pargs->control_mutex);
			usleep(20000);

		} while ( !wakeup );

	} while ( !pargs->finish );

	return NULL;
}


int main(int argc, char *argv[])
{
	int c;
	struct gpu_context *gctx = NULL;
	char *filename = NULL;
	char *outfile = NULL;
	FILE *fh;
	FILE *ofh;
	char *rval = NULL;
	int n_images;
	int n_indexable;
	int n_sane;
	int config_noindex = 0;
	int config_dumpfound = 0;
	int config_nearbragg = 0;
	int config_writedrx = 0;
	int config_simulate = 0;
	int config_cmfilter = 0;
	int config_noisefilter = 0;
	int config_nomatch = 0;
	int config_gpu = 0;
	int config_verbose = 0;
	int config_alternate = 0;
	int config_polar = 1;
	int config_sanity = 0;
	int config_satcorr = 1;
	int config_sa = 1;
	int config_checkprefix = 1;
	int config_closer = 1;
	float threshold = 800.0;
	struct detector *det;
	char *geometry = NULL;
	IndexingMethod indm;
	char *indm_str = NULL;
	UnitCell *cell;
	double *intensities = NULL;
	char *intfile = NULL;
	char *pdb = NULL;
	char *prefix = NULL;
	char *speaks = NULL;
	int peaks;
	int nthreads = 1;
	pthread_t workers[MAX_THREADS];
	struct process_args *worker_args[MAX_THREADS];
	int worker_active[MAX_THREADS];
	int i;
	pthread_mutex_t output_mutex = PTHREAD_MUTEX_INITIALIZER;
	pthread_mutex_t gpu_mutex = PTHREAD_MUTEX_INITIALIZER;
	char prepare_line[1024];
	char prepare_filename[1024];
	IndexingPrivate *ipriv;

	/* Long options */
	const struct option longopts[] = {
		{"help",               0, NULL,               'h'},
		{"input",              1, NULL,               'i'},
		{"output",             1, NULL,               'o'},
		{"gpu",                0, &config_gpu,         1},
		{"no-index",           0, &config_noindex,     1},
		{"dump-peaks",         0, &config_dumpfound,   1},
		{"peaks",              1, NULL,                2},
		{"near-bragg",         0, &config_nearbragg,   1},
		{"write-drx",          0, &config_writedrx,    1},
		{"indexing",           1, NULL,               'z'},
		{"geometry",           1, NULL,               'g'},
		{"simulate",           0, &config_simulate,    1},
		{"filter-cm",          0, &config_cmfilter,    1},
		{"filter-noise",       0, &config_noisefilter, 1},
		{"no-match",           0, &config_nomatch,     1},
		{"verbose",            0, &config_verbose,     1},
		{"alternate",          0, &config_alternate,   1},
		{"intensities",        1, NULL,               'q'},
		{"pdb",                1, NULL,               'p'},
		{"prefix",             1, NULL,               'x'},
		{"unpolarized",        0, &config_polar,       0},
		{"check-sanity",       0, &config_sanity,      1},
		{"no-sat-corr",        0, &config_satcorr,     0},
		{"sat-corr",           0, &config_satcorr,     1}, /* Compat */
		{"no-sa",              0, &config_sa,          0},
		{"threshold",          1, NULL,               't'},
		{"no-check-prefix",    0, &config_checkprefix, 0},
		{"no-closer-peak",     0, &config_closer,      0},
		{0, 0, NULL, 0}
	};

	/* Short options */
	while ((c = getopt_long(argc, argv, "hi:wp:j:x:g:t:o:",
	                        longopts, NULL)) != -1) {

		switch (c) {
		case 'h' :
			show_help(argv[0]);
			return 0;

		case 'i' :
			filename = strdup(optarg);
			break;

		case 'o' :
			outfile = strdup(optarg);
			break;

		case 'z' :
			indm_str = strdup(optarg);
			break;

		case 'q' :
			intfile = strdup(optarg);
			break;

		case 'p' :
			pdb = strdup(optarg);
			break;

		case 'x' :
			prefix = strdup(optarg);
			break;

		case 'j' :
			nthreads = atoi(optarg);
			break;

		case 'g' :
			geometry = strdup(optarg);
			break;

		case 't' :
			threshold = strtof(optarg, NULL);
			break;

		case 2 :
			speaks = strdup(optarg);
			break;

		case 0 :
			break;

		default :
			return 1;
		}

	}

	if ( filename == NULL ) {
		filename = strdup("-");
	}
	if ( strcmp(filename, "-") == 0 ) {
		fh = stdin;
	} else {
		fh = fopen(filename, "r");
	}
	if ( fh == NULL ) {
		ERROR("Failed to open input file '%s'\n", filename);
		return 1;
	}
	free(filename);

	if ( outfile == NULL ) {
		outfile = strdup("-");
	}
	if ( strcmp(outfile, "-") == 0 ) {
		ofh = stdout;
	} else {
		ofh = fopen(outfile, "w");
	}
	if ( ofh == NULL ) {
		ERROR("Failed to open output file '%s'\n", outfile);
		return 1;
	}
	free(outfile);

	if ( speaks == NULL ) {
		speaks = strdup("zaef");
		STATUS("You didn't specify a peak detection method.\n");
		STATUS("I'm using 'zaef' for you.\n");
	}
	if ( strcmp(speaks, "zaef") == 0 ) {
		peaks = PEAK_ZAEF;
	} else if ( strcmp(speaks, "hdf5") == 0 ) {
		peaks = PEAK_HDF5;
	} else {
		ERROR("Unrecognised peak detection method '%s'\n", speaks);
		return 1;
	}

	if ( intfile != NULL ) {
		ReflItemList *items;
		items = read_reflections(intfile, intensities,
		                         NULL, NULL, NULL);
		delete_items(items);
	} else {
		intensities = NULL;
	}

	if ( pdb == NULL ) {
		pdb = strdup("molecule.pdb");
	}

	if ( prefix == NULL ) {
		prefix = strdup("");
	} else {
		if ( config_checkprefix ) {
			prefix = check_prefix(prefix);
		}
	}

	if ( (nthreads == 0) || (nthreads > MAX_THREADS) ) {
		ERROR("Invalid number of threads.\n");
		return 1;
	}

	if ( indm_str == NULL ) {
		STATUS("You didn't specify an indexing method, so I won't"
		       " try to index anything.\n"
		       "If that isn't what you wanted, re-run with"
		       " --indexing=<method>.\n");
		indm = INDEXING_NONE;
	} else if ( strcmp(indm_str, "none") == 0 ) {
		indm = INDEXING_NONE;
	} else if ( strcmp(indm_str, "dirax") == 0) {
		indm = INDEXING_DIRAX;
	} else if ( strcmp(indm_str, "template") == 0) {
		indm = INDEXING_TEMPLATE;
	} else {
		ERROR("Unrecognised indexing method '%s'\n", indm_str);
		return 1;
	}
	free(indm_str);

	if ( geometry == NULL ) {
		ERROR("You need to specify a geometry file with --geometry\n");
		return 1;
	}

	det = get_detector_geometry(geometry);
	if ( det == NULL ) {
		ERROR("Failed to read detector geometry from '%s'\n", geometry);
		return 1;
	}
	free(geometry);

	if ( (!config_nomatch) || (indm == INDEXING_TEMPLATE) ) {
		cell = load_cell_from_pdb(pdb);
		if ( cell == NULL ) {
			ERROR("Couldn't read unit cell (from %s)\n", pdb);
			return 1;
		}
	} else {
		STATUS("No cell needed because --no-match was used.\n");
		cell = NULL;
	}
	free(pdb);

	/* Start by writing the entire command line to stdout */
	fprintf(ofh, "Command line:");
	for ( i=0; i<argc; i++ ) {
		fprintf(ofh, " %s", argv[i]);
	}
	fprintf(ofh, "\n");
	fflush(ofh);

	/* Get first filename and use it to set up the indexing */
	rval = fgets(prepare_line, 1023, fh);
	if ( rval == NULL ) {
		ERROR("Failed to get filename to prepare indexing.\n");
		return 1;
	}
	chomp(prepare_line);
	snprintf(prepare_filename, 1023, "%s%s", prefix, prepare_line);
	ipriv = prepare_indexing(indm, cell, prepare_filename, det);
	if ( ipriv == NULL ) {
		ERROR("Failed to prepare indexing.\n");
		return 1;
	}

	gsl_set_error_handler_off();
	n_images = 0;
	n_indexable = 0;
	n_sane = 0;

	for ( i=0; i<nthreads; i++ ) {
		worker_args[i] = malloc(sizeof(struct process_args));
		worker_args[i]->filename = malloc(1024);
		worker_args[i]->ofh = ofh;
		worker_args[i]->peaks = peaks;
		worker_active[i] = 0;
	}

	/* Start threads off */
	for ( i=0; i<nthreads; i++ ) {

		char line[1024];
		struct process_args *pargs;
		int r;

		pargs = worker_args[i];

		if ( strlen(prepare_line) > 0 ) {
			strcpy(line, prepare_line);
			prepare_line[0] = '\0';
		} else {
			rval = fgets(line, 1023, fh);
			if ( rval == NULL ) continue;
		}
		chomp(line);
		snprintf(pargs->filename, 1023, "%s%s", prefix, line);

		n_images++;

		pargs->output_mutex = &output_mutex;
		pargs->gpu_mutex = &gpu_mutex;
		pthread_mutex_init(&pargs->control_mutex, NULL);
		pargs->config_cmfilter = config_cmfilter;
		pargs->config_noisefilter = config_noisefilter;
		pargs->config_writedrx = config_writedrx;
		pargs->config_dumpfound = config_dumpfound;
		pargs->config_verbose = config_verbose;
		pargs->config_alternate = config_alternate;
		pargs->config_nearbragg = config_nearbragg;
		pargs->config_gpu = config_gpu;
		pargs->config_simulate = config_simulate;
		pargs->config_nomatch = config_nomatch;
		pargs->config_polar = config_polar;
		pargs->config_sanity = config_sanity;
		pargs->config_satcorr = config_satcorr;
		pargs->config_sa = config_sa;
		pargs->config_closer = config_closer;
		pargs->cell = cell;
		pargs->det = det;
		pargs->ipriv = ipriv;
		pargs->indm = indm;
		pargs->intensities = intensities;
		pargs->gctx = gctx;
		pargs->threshold = threshold;
		pargs->id = i;
		pthread_mutex_lock(&pargs->control_mutex);
		pargs->done = 0;
		pargs->start = 1;
		pargs->finish = 0;
		pthread_mutex_unlock(&pargs->control_mutex);

		worker_active[i] = 1;
		r = pthread_create(&workers[i], NULL, worker_thread, pargs);
		if ( r != 0 ) {
			worker_active[i] = 0;
			ERROR("Couldn't start thread %i\n", i);
		}

	}

	/* Keep threads busy until the end of the data */
	do {

		int i;

		for ( i=0; i<nthreads; i++ ) {

			char line[1024];
			struct process_args *pargs;
			int done;

			/* Spend CPU time indexing, not checking results */
			usleep(100000);

			/* Are we using this thread record at all? */
			if ( !worker_active[i] ) continue;

			/* Has the thread finished yet? */
			pargs = worker_args[i];
			pthread_mutex_lock(&pargs->control_mutex);
			done = pargs->done;
			pthread_mutex_unlock(&pargs->control_mutex);
			if ( !done ) continue;

			/* Results will be processed after checking if
			 * there are any more images to process. */

			/* Get next filename */
			rval = fgets(line, 1023, fh);
			/* In this case, the result of the last file
			 * file will be processed when the thread is
			 * joined. */
			if ( rval == NULL ) break;

			/* Record the result */
			n_indexable += pargs->indexable;
			n_sane += pargs->sane;

			chomp(line);
			snprintf(pargs->filename, 1023, "%s%s", prefix, line);

			n_images++;

			/* Wake the thread up ... */
			pthread_mutex_lock(&pargs->control_mutex);
			pargs->done = 0;
			pargs->start = 1;
			pthread_mutex_unlock(&pargs->control_mutex);

		}

	} while ( rval != NULL );

	/* Join threads */
	for ( i=0; i<nthreads; i++ ) {

		if ( !worker_active[i] ) goto free;

		/* Tell the thread to exit */
		struct process_args *pargs = worker_args[i];
		pthread_mutex_lock(&pargs->control_mutex);
		pargs->finish = 1;
		pthread_mutex_unlock(&pargs->control_mutex);

		/* Wait for it to join */
		pthread_join(workers[i], NULL);
		worker_active[i] = 0;

		n_indexable += pargs->indexable;
		n_sane += pargs->sane;

	free:
		if ( worker_args[i]->filename != NULL ) {
			free(worker_args[i]->filename);
		}
		free(worker_args[i]);

	}

	cleanup_indexing(ipriv);

	free(prefix);
	free(det->panels);
	free(det);
	cell_free(cell);
	fclose(fh);

	STATUS("There were %i images.  %i could be indexed, of which %i"
	       " looked sane.\n", n_images, n_indexable, n_sane);

	if ( gctx != NULL ) {
		cleanup_gpu(gctx);
	}

	return 0;
}