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#include "swmr_common.h"
#include <unistd.h>
#define TIMEOUT 300
static hid_t symbol_tid = (-1);
static int
check_dataset(hid_t fid, unsigned verbose, const symbol_info_t *symbol, symbol_t *record,
hid_t rec_sid)
{
hid_t dsid; /* Dataset ID */
hid_t file_sid; /* Dataset's space ID */
hsize_t start[2] = {0, 0}, count[2] = {1, 1}; /* Hyperslab selection values */
/* Open dataset for symbol */
if((dsid = H5Dopen2(fid, symbol->name, H5P_DEFAULT)) < 0)
return(-1);
/* Get the dataset's dataspace */
if((file_sid = H5Dget_space(dsid)) < 0)
return(-1);
/* Choose the random record in the dataset (will be the same as chosen by
* the writer) */
start[1] = (hsize_t)random() % symbol->nrecords;
if(H5Sselect_hyperslab(file_sid, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
return(-1);
/* Emit informational message */
if(verbose)
printf("Symbol = '%s', location = %lld\n", symbol->name, (long long)start);
/* Read record from dataset */
#ifdef OHDR_DEPS_WORK
/* Even with the sequence number attribute and all the flush dependencues,
* it is still currently possible for the attribute to be updated before the
* index and/or raw data, because the attribute may reside in an object
* header chunk afer the first. Until this is fixed, just allow the read
* value to be 0. */
record->rec_id = (uint64_t)ULLONG_MAX;
#else /* OHDR_DEPS_WORK */
record->rec_id = (uint64_t)0;
#endif /* OHDR_DEPS_WORK */
if(H5Dread(dsid, symbol_tid, rec_sid, file_sid, H5P_DEFAULT, record) < 0)
return(-1);
/* Verify record value */
if(record->rec_id != start[1]
#ifndef OHDR_DEPS_WORK
&& record->rec_id != (uint64_t)0
#endif
) {
printf("Incorrect record value!\n");
printf("Symbol = '%s', location = %lld, record->rec_id = %llu\n", symbol->name, (long long)start, (unsigned long long)record->rec_id);
return(-1);
} /* end if */
/* Close the dataset's dataspace */
if(H5Sclose(file_sid) < 0)
return(-1);
/* Close dataset for symbol */
if(H5Dclose(dsid) < 0)
return(-1);
return(0);
} /* end check_dataset() */
static int
read_records(const char *filename, unsigned verbose, unsigned long nrecords,
unsigned poll_time, unsigned reopen_count)
{
hid_t fid; /* File ID */
hid_t aid; /* Attribute ID */
time_t start_time; /* Starting time */
hid_t mem_sid; /* Memory dataspace ID */
symbol_t record; /* The record to add to the dataset */
unsigned seed; /* Seed for random number generator */
unsigned iter_to_reopen = reopen_count; /* # of iterations until reopen */
unsigned long u; /* Local index variable */
hid_t fapl;
fapl = H5Pcreate(H5P_FILE_ACCESS);
H5Pset_fclose_degree(fapl, H5F_CLOSE_SEMI);
/* Emit informational message */
if(verbose)
printf("Opening file: %s\n", filename);
/* Open the file */
if((fid = H5Fopen(filename, H5F_ACC_RDONLY | H5F_ACC_SWMR_READ, fapl)) < 0)
return(-1);
/* Seed the random number generator with the attribute in the file */
if((aid = H5Aopen(fid, "seed", H5P_DEFAULT)) < 0)
return(-1);
if(H5Aread(aid, H5T_NATIVE_UINT, &seed) < 0)
return(-1);
if(H5Aclose(aid) < 0)
return(-1);
srandom(seed);
/* Reset the record */
/* (record's 'info' field might need to change for each record written, also) */
memset(&record, 0, sizeof(record));
/* Create a dataspace for the record to read */
if((mem_sid = H5Screate(H5S_SCALAR)) < 0)
return(-1);
/* Emit informational message */
if(verbose)
printf("Reading records\n");
/* Get the starting time */
start_time = time(NULL);
/* Read records */
for(u = 0; u < nrecords; u++) {
symbol_info_t *symbol = NULL; /* Symbol (dataset) */
htri_t attr_exists; /* Whether the sequence number attribute exists */
unsigned long file_u; /* Attribute sequence number (writer's "u") */
/* Get a random dataset, according to the symbol distribution */
symbol = choose_dataset();
/* Fill in "nrecords" field. Note that this depends on the writer
* using the same algorithm and "nrecords" */
symbol->nrecords = nrecords / 5;
/* Wait until we can read the dataset */
do {
/* Check if sequence attribute exists */
if((attr_exists = H5Aexists_by_name(fid, symbol->name, "seq", H5P_DEFAULT)) < 0)
return(-1);
if(attr_exists) {
/* Read sequence number attribute */
if((aid = H5Aopen_by_name(fid, symbol->name, "seq", H5P_DEFAULT, H5P_DEFAULT)) < 0)
return(-1);
if(H5Aread(aid, H5T_NATIVE_ULONG, &file_u) < 0)
return(-1);
if(H5Aclose(aid) < 0)
return(-1);
/* Check if sequence number is at least u - if so, this should
* guarantee that this record has been written */
if(file_u >= u)
break;
} /* end if */
/* Check for timeout */
if(time(NULL) >= (time_t)(start_time + (time_t)TIMEOUT)) {
printf("Reader timed out\n");
return(-1);
} /* end if */
/* Pause */
sleep(poll_time);
/* Reopen the file */
if(H5Fclose(fid) < 0)
return(-1);
if((fid = H5Fopen(filename, H5F_ACC_RDONLY | H5F_ACC_SWMR_READ, fapl)) < 0)
return(-1);
iter_to_reopen = reopen_count;
} while(1);
/* Emit informational message */
if(verbose)
printf("Checking dataset %lu\n", u);
/* Check dataset */
if(check_dataset(fid, verbose, symbol, &record, mem_sid) < 0)
return(-1);
/* Check for reopen */
iter_to_reopen--;
if(iter_to_reopen == 0) {
/* Emit informational message */
if(verbose)
printf("Reopening file: %s\n", filename);
/* Reopen the file */
if(H5Fclose(fid) < 0)
return(-1);
if((fid = H5Fopen(filename, H5F_ACC_RDONLY | H5F_ACC_SWMR_READ, fapl)) < 0)
return(-1);
iter_to_reopen = reopen_count;
} /* end if */
} /* end while */
/* Close file */
if(H5Fclose(fid) < 0)
return(-1);
/* Close the memory dataspace */
if(H5Sclose(mem_sid) < 0)
return(-1);
return(0);
} /* end read_records() */
static void
usage(void)
{
printf("Usage error!\n");
printf("Usage: swmr_sparse_reader [-q] [-s <# of seconds to wait for writer>] [-r <# of reads between reopens>] <# of records>\n");
printf("Defaults to verbose (no '-q' given), 1 second wait ('-s 1') and 1 read between reopens ('-r 1')\n");
printf("Note that the # of records *must* be the same as that supplied to swmr_sparse_writer\n");
exit(1);
} /* end usage() */
int main(int argc, const char *argv[])
{
long nrecords = 0; /* # of records to read */
int poll_time = 1; /* # of seconds to sleep when waiting for writer */
int reopen_count = 1; /* # of reads between reopens */
unsigned verbose = 1; /* Whether to emit some informational messages */
unsigned u; /* Local index variables */
/* Parse command line options */
if(argc < 2)
usage();
if(argc > 1) {
u = 1;
while(u < (unsigned)argc) {
if(argv[u][0] == '-') {
switch(argv[u][1]) {
/* # of reads between reopens */
case 'r':
reopen_count = atoi(argv[u + 1]);
if(reopen_count < 0)
usage();
u += 2;
break;
/* Be quiet */
case 'q':
verbose = 0;
u++;
break;
/* # of seconds between polling */
case 's':
poll_time = atoi(argv[u + 1]);
if(poll_time < 0)
usage();
u += 2;
break;
default:
usage();
break;
} /* end switch */
} /* end if */
else {
/* Get the number of records to read */
nrecords = atol(argv[u]);
if(nrecords <= 0)
usage();
u++;
} /* end else */
} /* end while */
} /* end if */
/* Emit informational message */
if(verbose) {
printf("Parameters:\n");
printf("\t# of seconds between polling = %d\n", poll_time);
printf("\t# of reads between reopens = %d\n", reopen_count);
printf("\t# of records to read = %ld\n", nrecords);
} /* end if */
/* Emit informational message */
if(verbose)
printf("Generating symbol names\n");
/* Generate dataset names */
if(generate_symbols() < 0) {
printf("Error generating symbol names!\n");
exit(1);
} /* end if */
/* Create datatype for creating datasets */
if((symbol_tid = create_symbol_datatype()) < 0)
return(-1);
/* Reading records from datasets */
if(read_records(FILENAME, verbose, (unsigned long) nrecords, (unsigned)poll_time, (unsigned)reopen_count) < 0) {
printf("Error reading records from datasets!\n");
exit(1);
} /* end if */
/* Emit informational message */
if(verbose)
printf("Releasing symbols\n");
/* Clean up the symbols */
if(shutdown_symbols() < 0) {
printf("Error releasing symbols!\n");
exit(1);
} /* end if */
/* Emit informational message */
if(verbose)
printf("Closing objects\n");
/* Close objects created */
if(H5Tclose(symbol_tid) < 0) {
printf("Error closing symbol datatype!\n");
exit(1);
} /* end if */
return(0);
}
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