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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Use Case 1.7 Appending a single chunk
* Description:
* Appending a single chunk of raw data to a dataset along an unlimited
* dimension within a pre-created file and reading the new data back.
* Goal:
* Read data appended by the Writer to a pre-existing dataset in a
* file. The dataset has one or more unlimited dimensions. The data is
* appended by a hyperslab that is contained in one chunk (for example,
* appending 2-dim planes along the slowest changing dimension in the
* 3-dim dataset).
* Level:
* User Level
* Guarantees:
* o Readers will see the modified dimension sizes after the Writer
* finishes HDF5 metadata updates and issues H5Fflush or H5Oflush calls.
* o Readers will see newly appended data after the Writer finishes
* the flush operation.
*
* Preconditions:
* o Readers are not allowed to modify the file. o All datasets
* that are modified by the Writer exist when the Writer opens the file.
* o All datasets that are modified by the Writer exist when a Reader
* opens the file. o Data is written by a hyperslab contained in
* one chunk.
*
* Main Success Scenario:
* 1. An application creates a file with required objects (groups,
* datasets, and attributes).
* 2. The Writer application opens the file and datasets in the file
* and starts adding data along the unlimited dimension using a hyperslab
* selection that corresponds to an HDF5 chunk.
* 3. A Reader opens the file and a dataset in a file, and queries
* the sizes of the dataset; if the extent of the dataset has changed,
* reads the appended data back.
*
* Discussion points:
* 1. Since the new data is written to the file, and metadata update
* operation of adding pointer to the newly written chunk is atomic and
* happens after the chunk is on the disk, only two things may happen
* to the Reader:
* o The Reader will not see new data.
* o The Reader will see all new data written by Writer.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Created: Albert Cheng, 2013/5/28 */
#include "h5test.h"
/* This test uses many POSIX things that are not available on
* Windows. We're using a check for fork(2) here as a proxy for
* all POSIX/Unix/Linux things until this test can be made
* more platform-independent.
*/
#ifdef H5_HAVE_FORK
#include "use.h"
/* Global Variable definitions */
options_t UC_opts; /* Use Case Options */
const char *progname_g="use_append_chunk"; /* program name */
/* Setup parameters for the use case.
* Return: 0 succeed; -1 fail.
*/
int setup_parameters(int argc, char * const argv[])
{
/* use case defaults */
HDmemset(&UC_opts, 0, sizeof(options_t));
UC_opts.chunksize = Chunksize_DFT;
UC_opts.use_swmr = 1; /* use swmr open */
UC_opts.iterations = 1;
UC_opts.chunkplanes = 1;
/* parse options */
if (parse_option(argc, argv) < 0){
return(-1);
}
/* set chunk dims */
UC_opts.chunkdims[0] = (hsize_t)UC_opts.chunkplanes;
UC_opts.chunkdims[1] = UC_opts.chunkdims[2] = (hsize_t)UC_opts.chunksize;
/* set dataset initial and max dims */
UC_opts.dims[0] = 0;
UC_opts.max_dims[0] = H5S_UNLIMITED;
UC_opts.dims[1] = UC_opts.dims[2] = UC_opts.max_dims[1] = UC_opts.max_dims[2] = (hsize_t)UC_opts.chunksize;
/* set nplanes */
if (UC_opts.nplanes == 0)
UC_opts.nplanes = (hsize_t)UC_opts.chunksize;
/* show parameters and return */
show_parameters();
return(0);
}
/* Overall Algorithm:
* Parse options from user;
* Generate/pre-created test files needed and close it;
* fork: child process becomes the reader process;
* while parent process continues as the writer process;
* both run till ending conditions are met.
*/
int
main(int argc, char *argv[])
{
pid_t childpid=0;
pid_t mypid, tmppid;
int child_status;
int child_wait_option=0;
int ret_value = 0;
int child_ret_value;
hbool_t send_wait = 0;
/* initialization */
if (setup_parameters(argc, argv) < 0){
Hgoto_error(1);
}
/* Determine the need to send/wait message file*/
if(UC_opts.launch == UC_READWRITE) {
HDunlink(WRITER_MESSAGE);
send_wait = 1;
}
/* ==============================================================*/
/* UC_READWRITE: create datafile, launch both reader and writer. */
/* UC_WRITER: create datafile, skip reader, launch writer. */
/* UC_READER: skip create, launch reader, exit. */
/* ==============================================================*/
/* ============*/
/* Create file */
/* ============*/
if (UC_opts.launch != UC_READER){
printf("Creating skeleton data file for test...\n");
if (create_uc_file() < 0){
fprintf(stderr, "***encounter error\n");
Hgoto_error(1);
}else
printf("File created.\n");
}
if (UC_opts.launch==UC_READWRITE){
/* fork process */
if((childpid = fork()) < 0) {
perror("fork");
Hgoto_error(1);
};
};
mypid = getpid();
/* ============= */
/* launch reader */
/* ============= */
if (UC_opts.launch != UC_WRITER){
/* child process launch the reader */
if(0 == childpid) {
printf("%d: launch reader process\n", mypid);
if (read_uc_file(send_wait) < 0){
fprintf(stderr, "read_uc_file encountered error\n");
exit(1);
}
exit(0);
}
}
/* ============= */
/* launch writer */
/* ============= */
/* this process continues to launch the writer */
printf("%d: continue as the writer process\n", mypid);
if (write_uc_file(send_wait) < 0){
fprintf(stderr, "write_uc_file encountered error\n");
Hgoto_error(1);
}
/* ================================================ */
/* If readwrite, collect exit code of child process */
/* ================================================ */
if (UC_opts.launch == UC_READWRITE){
if ((tmppid = waitpid(childpid, &child_status, child_wait_option)) < 0){
perror("waitpid");
Hgoto_error(1);
}
if (WIFEXITED(child_status)){
if ((child_ret_value=WEXITSTATUS(child_status)) != 0){
printf("%d: child process exited with non-zero code (%d)\n",
mypid, child_ret_value);
Hgoto_error(2);
}
} else {
printf("%d: child process terminated abnormally\n", mypid);
Hgoto_error(2);
}
}
done:
/* Print result and exit */
if (ret_value != 0){
printf("Error(s) encountered\n");
}else{
printf("All passed\n");
}
return(ret_value);
}
#else /* H5_HAVE_FORK */
int
main(void)
{
HDfprintf(stderr, "Non-POSIX platform. Skipping.\n");
return EXIT_SUCCESS;
} /* end main() */
#endif /* H5_HAVE_FORK */
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