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25ec07450a
and replace it with new url for COPYING file. Fix 2 lines in java error test expected output file where messages include line numbers changed by reducing the copyright header by 2 lines.
462 lines
14 KiB
C
462 lines
14 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/***********************************************************
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*
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* Test program: twriteorder
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*
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* Test to verify that the write order is strictly consistent.
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* The SWMR feature requires that the order of write is strictly consistent.
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* "Strict consistency in computer science is the most stringent consistency
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* model. It says that a read operation has to return the result of the
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* latest write operation which occurred on that data item."--
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* (http://en.wikipedia.org/wiki/Linearizability#Definition_of_linearizability).
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* This is also an alternative form of what POSIX write require that after a
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* write operation has returned success, all reads issued afterward should
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* get the same data the write has written.
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*
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* Created: Albert Cheng, 2013/8/28.
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* Modified:
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*************************************************************/
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/***********************************************************
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*
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* Algorithm
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*
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* The test simulates what SWMR does by writing chained blocks and see if
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* they can be read back correctly.
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* There is a writer process and multiple read processes.
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* The file is divided into 2KB partitions. Then writer writes 1 chained
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* block, each of 1KB big, in each partition after the first partition.
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* Each chained block has this structure:
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* Byte 0-3: offset address of its child block. The last child uses 0 as NULL.
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* Byte 4-1023: some artificial data.
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* The child block address of Block 1 is NULL (0).
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* The child block address of Block 2 is the offset address of Block 1.
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* The child block address of Block n is the offset address of Block n-1.
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* After all n blocks are written, the offset address of Block n is written
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* to the offset 0 of the first partition.
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* Therefore, by the time the offset address of Block n is written to this
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* position, all n chain-linked blocks have been written.
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*
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* The other reader processes will try to read the address value at the
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* offset 0. The value is initially NULL(0). When it changes to non-zero,
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* it signifies the writer process has written all the chain-link blocks
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* and they are ready for the reader processes to access.
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*
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* If the system, in which the writer and reader processes run, the readers
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* will always get all chain-linked blocks correctly. If the order of write
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* is not maintained, some reader processes may found unexpect block data.
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*
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*************************************************************/
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#include "h5test.h"
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/* This test uses many POSIX things that are not available on
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* Windows. We're using a check for fork(2) here as a proxy for
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* all POSIX/Unix/Linux things until this test can be made
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* more platform-independent.
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*/
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#ifdef H5_HAVE_FORK
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#define DATAFILE "twriteorder.dat"
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/* #define READERS_MAX 10 */ /* max number of readers */
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#define BLOCKSIZE_DFT 1024 /* 1KB */
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#define PARTITION_DFT 2048 /* 2KB */
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#define NLINKEDBLOCKS_DFT 512 /* default 512 */
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#define SIZE_BLKADDR 4 /* expected sizeof blkaddr */
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#define Hgoto_error(val) {ret_value=val; goto done;}
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/* type declarations */
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typedef enum part_t {
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UC_READWRITE =0, /* both writer and reader */
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UC_WRITER, /* writer only */
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UC_READER /* reader only */
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} part_t;
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/* prototypes */
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int create_wo_file(void);
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int write_wo_file(void);
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int read_wo_file(void);
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void usage(const char *prog);
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int setup_parameters(int argc, char * const argv[]);
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int parse_option(int argc, char * const argv[]);
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/* Global Variable definitions */
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const char *progname_g="twriteorder"; /* program name */
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int write_fd_g;
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int blocksize_g, part_size_g, nlinkedblock_g;
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part_t launch_g;
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/* Function definitions */
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/* Show help page */
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void
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usage(const char *prog)
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{
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fprintf(stderr, "usage: %s [OPTIONS]\n", prog);
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fprintf(stderr, " OPTIONS\n");
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fprintf(stderr, " -h Print a usage message and exit\n");
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fprintf(stderr, " -l w|r launch writer or reader only. [default: launch both]\n");
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fprintf(stderr, " -b N Block size [default: %d]\n", BLOCKSIZE_DFT);
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fprintf(stderr, " -p N Partition size [default: %d]\n", PARTITION_DFT);
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fprintf(stderr, " -n N Number of linked blocks [default: %d]\n", NLINKEDBLOCKS_DFT);
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fprintf(stderr, " where N is an integer value\n");
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fprintf(stderr, "\n");
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}
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/* Setup test parameters by parsing command line options.
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* Setup default values if not set by options. */
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int
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parse_option(int argc, char * const argv[])
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{
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int ret_value=0;
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int c;
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/* command line options: See function usage for a description */
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const char *cmd_options = "hb:l:n:p:";
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/* suppress getopt from printing error */
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opterr = 0;
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while (1){
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c = getopt (argc, argv, cmd_options);
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if (-1 == c)
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break;
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switch (c) {
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case 'h':
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usage(progname_g);
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exit(0);
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break;
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case 'b': /* number of planes to write/read */
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if ((blocksize_g = atoi(optarg)) <= 0){
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fprintf(stderr, "bad blocksize %s, must be a positive integer\n", optarg);
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usage(progname_g);
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Hgoto_error(-1);
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};
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break;
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case 'n': /* number of planes to write/read */
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if ((nlinkedblock_g = atoi(optarg)) < 2){
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fprintf(stderr, "bad number of linked blocks %s, must be greater than 1.\n", optarg);
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usage(progname_g);
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Hgoto_error(-1);
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};
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break;
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case 'p': /* number of planes to write/read */
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if ((part_size_g = atoi(optarg)) <= 0){
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fprintf(stderr, "bad partition size %s, must be a positive integer\n", optarg);
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usage(progname_g);
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Hgoto_error(-1);
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};
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break;
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case 'l': /* launch reader or writer only */
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switch (*optarg) {
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case 'r': /* reader only */
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launch_g = UC_READER;
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break;
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case 'w': /* writer only */
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launch_g = UC_WRITER;
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break;
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default:
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fprintf(stderr, "launch value(%c) should be w or r only.\n", *optarg);
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usage(progname_g);
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Hgoto_error(-1);
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break;
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}
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printf("launch = %d\n", launch_g);
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break;
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case '?':
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fprintf(stderr, "getopt returned '%c'.\n", c);
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usage(progname_g);
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Hgoto_error(-1);
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default:
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fprintf(stderr, "getopt returned unexpected value.\n");
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fprintf(stderr, "Unexpected value is %d\n", c);
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Hgoto_error(-1);
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}
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}
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/* verify partition size must be >= blocksize */
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if (part_size_g < blocksize_g ){
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fprintf(stderr, "Blocksize %d should not be bigger than partition size %d\n",
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blocksize_g, part_size_g);
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Hgoto_error(-1);
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}
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done:
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/* All done. */
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return(ret_value);
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}
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/* Setup parameters for the test case.
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* Return: 0 succeed; -1 fail.
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*/
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int setup_parameters(int argc, char * const argv[])
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{
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/* test case defaults */
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blocksize_g = BLOCKSIZE_DFT;
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part_size_g = PARTITION_DFT;
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nlinkedblock_g = NLINKEDBLOCKS_DFT;
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launch_g = UC_READWRITE;
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/* parse options */
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if (parse_option(argc, argv) < 0){
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return(-1);
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}
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/* show parameters and return */
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printf("blocksize = %ld\n", (long)blocksize_g);
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printf("part_size = %ld\n", (long)part_size_g);
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printf("nlinkedblock = %ld\n", (long)nlinkedblock_g);
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printf("launch = %d\n", launch_g);
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return(0);
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}
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/* Create the test file with initial "empty" file, that is,
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* partition 0 has a null (0) address.
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*
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* Return: 0 succeed; -1 fail.
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*/
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int create_wo_file(void)
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{
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int blkaddr=0; /* blkaddress of next linked block */
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int ret_code;
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/* Create the data file */
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if ((write_fd_g = HDopen(DATAFILE, O_RDWR|O_TRUNC|O_CREAT, 0664)) < 0) {
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printf("WRITER: error from open\n");
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return -1;
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}
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blkaddr=0;
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/* write it to partition 0 */
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if ((ret_code=HDwrite(write_fd_g, &blkaddr, (size_t)SIZE_BLKADDR)) != SIZE_BLKADDR){
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printf("blkaddr write failed\n");
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return -1;
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}
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/* File initialized, return success */
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return 0;
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}
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int write_wo_file(void)
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{
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int blkaddr;
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int blkaddr_old=0;
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int i;
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char buffer[BLOCKSIZE_DFT];
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int ret_code;
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/* write block 1, 2, ... */
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for (i=1; i<nlinkedblock_g; i++){
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/* calculate where to write this block */
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blkaddr = i*part_size_g + i;
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/* store old block address in byte 0-3 */
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HDmemcpy(&buffer[0], &blkaddr_old, sizeof(blkaddr_old));
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/* fill the rest with the lowest byte of i */
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HDmemset(&buffer[4], i & 0xff, (size_t) (BLOCKSIZE_DFT-4));
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/* write the block */
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#ifdef DEBUG
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printf("writing block at %d\n", blkaddr);
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#endif
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HDlseek(write_fd_g, (HDoff_t)blkaddr, SEEK_SET);
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if ((ret_code=HDwrite(write_fd_g, buffer, (size_t)blocksize_g)) != blocksize_g){
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printf("blkaddr write failed in partition %d\n", i);
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return -1;
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}
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blkaddr_old = blkaddr;
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}
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/* write the last blkaddr in partition 0 */
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HDlseek(write_fd_g, (HDoff_t)0, SEEK_SET);
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if ((ret_code=HDwrite(write_fd_g, &blkaddr_old, (size_t)sizeof(blkaddr_old))) != sizeof(blkaddr_old)){
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printf("blkaddr write failed in partition %d\n", 0);
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return -1;
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}
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/* all writes done. return succeess. */
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#ifdef DEBUG
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printf("wrote %d blocks\n", nlinkedblock_g);
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#endif
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return 0;
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}
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int read_wo_file(void)
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{
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int read_fd;
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int blkaddr=0;
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int ret_code;
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int linkedblocks_read=0;
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char buffer[BLOCKSIZE_DFT];
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/* Open the data file */
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if ((read_fd = HDopen(DATAFILE, O_RDONLY, 0)) < 0) {
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printf("READER: error from open\n");
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return -1;
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}
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/* keep reading the initial block address until it is non-zero before proceeding. */
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while (blkaddr == 0){
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HDlseek(read_fd, (HDoff_t)0, SEEK_SET);
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if ((ret_code=HDread(read_fd, &blkaddr, (size_t)sizeof(blkaddr))) != sizeof(blkaddr)){
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printf("blkaddr read failed in partition %d\n", 0);
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return -1;
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}
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}
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linkedblocks_read++;
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/* got a non-zero blkaddr. Proceed down the linked blocks. */
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#ifdef DEBUG
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printf("got initial block address=%d\n", blkaddr);
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#endif
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while (blkaddr != 0){
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HDlseek(read_fd, (HDoff_t)blkaddr, SEEK_SET);
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if ((ret_code=HDread(read_fd, buffer, (size_t)blocksize_g)) != blocksize_g){
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printf("blkaddr read failed in partition %d\n", 0);
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return -1;
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}
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linkedblocks_read++;
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/* retrieve the block address in byte 0-3 */
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HDmemcpy(&blkaddr, &buffer[0], sizeof(blkaddr));
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#ifdef DEBUG
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printf("got next block address=%d\n", blkaddr);
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#endif
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}
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#ifdef DEBUG
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printf("read %d blocks\n", linkedblocks_read);
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#endif
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return 0;
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}
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/* Overall Algorithm:
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* Parse options from user;
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* Generate/pre-created the test file needed and close it;
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* fork: child processes become the reader processes;
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* while parent process continues as the writer process;
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* both run till ending conditions are met.
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*/
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int
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main(int argc, char *argv[])
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{
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/*pid_t childpid[READERS_MAX];
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int child_ret_value[READERS_MAX];*/
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pid_t childpid=0;
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int child_ret_value;
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pid_t mypid, tmppid;
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int child_status;
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int child_wait_option=0;
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int ret_value = 0;
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/* initialization */
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if (setup_parameters(argc, argv) < 0){
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Hgoto_error(1);
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}
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/* ==============================================================*/
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/* UC_READWRITE: create datafile, launch both reader and writer. */
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/* UC_WRITER: create datafile, skip reader, launch writer. */
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/* UC_READER: skip create, launch reader, exit. */
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/* ==============================================================*/
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/* ============*/
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/* Create file */
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/* ============*/
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if (launch_g != UC_READER){
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printf("Creating skeleton data file for test...\n");
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if (create_wo_file() < 0){
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fprintf(stderr, "***encounter error\n");
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Hgoto_error(1);
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}else
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printf("File created.\n");
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}
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/* flush output before possible fork */
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HDfflush(stdout);
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if (launch_g==UC_READWRITE){
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/* fork process */
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if((childpid = fork()) < 0) {
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perror("fork");
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Hgoto_error(1);
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};
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};
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mypid = getpid();
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/* ============= */
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/* launch reader */
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/* ============= */
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if (launch_g != UC_WRITER){
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/* child process launch the reader */
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if(0 == childpid) {
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printf("%d: launch reader process\n", mypid);
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if (read_wo_file() < 0){
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fprintf(stderr, "read_wo_file encountered error\n");
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exit(1);
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}
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/* Reader is done. Clean up by removing the data file */
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HDremove(DATAFILE);
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exit(0);
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}
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}
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/* ============= */
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/* launch writer */
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/* ============= */
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/* this process continues to launch the writer */
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#ifdef DEBUG
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printf("%d: continue as the writer process\n", mypid);
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#endif
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if (write_wo_file() < 0){
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fprintf(stderr, "write_wo_file encountered error\n");
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Hgoto_error(1);
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}
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/* ================================================ */
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/* If readwrite, collect exit code of child process */
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/* ================================================ */
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if (launch_g == UC_READWRITE){
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if ((tmppid = waitpid(childpid, &child_status, child_wait_option)) < 0){
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perror("waitpid");
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Hgoto_error(1);
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}
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if (WIFEXITED(child_status)){
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if ((child_ret_value=WEXITSTATUS(child_status)) != 0){
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printf("%d: child process exited with non-zero code (%d)\n",
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mypid, child_ret_value);
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Hgoto_error(2);
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}
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} else {
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printf("%d: child process terminated abnormally\n", mypid);
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Hgoto_error(2);
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}
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}
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done:
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/* Print result and exit */
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if (ret_value != 0){
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printf("Error(s) encountered\n");
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}else{
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printf("All passed\n");
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}
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return(ret_value);
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}
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#else /* H5_HAVE_FORK */
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int
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main(void)
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{
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HDfprintf(stderr, "Non-POSIX platform. Skipping.\n");
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return EXIT_SUCCESS;
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} /* end main() */
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#endif /* H5_HAVE_FORK */
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