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/*
* Copyright (c) 2011-2014 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation, Adhemerval Zanella - Example creation.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sphde/sassim.h>
#include <sphde/sphcontext.h>
#include <sphde/sasalloc.h>
/*
* This is a simple example to show how to use a Shared Persistent Heap (SPH)
* across multiple executions.
* The program handles multiple pairs of strings, similar to a dictionary. The
* following commands show its functionality with examples:
*
* # associates the string 'test1' with default key ('defaultBufferKey')
* ./example_sph_1 -w "test1"
*
* # reads the written value on default key
* ./example_sph_1 -r
*
* # associates the string 'test2' with key 'key2'
* ./example_sph_1 -b key2 -w "test2"
*
* # reads the value for the key 'test2'
* ./example_sph_1 -b key2 -r
*/
const char progName[] = "example_sph_1";
const char defaultKeyName[] = "defaultBufferKey";
void
usage(void)
{
printf("Usage: %s [-b buffer_name] [-w string_to_write] [-r]\n", progName);
}
int
main (int argc, char *argv[])
{
int rc;
char *block;
SPHContext_t finderContext;
int actWrite = 0, actRead = 0;
const char *bufferKeyName = defaultKeyName;
const char *actToWrite = NULL;
int opt;
while ((opt = getopt(argc, argv, "b:w:rh")) != -1) {
switch (opt) {
case 'b':
bufferKeyName = optarg;
break;
case 'w':
actWrite = 1;
actToWrite = optarg;
break;
case 'r':
actRead = 1;
break;
case 'h':
usage();
exit(EXIT_SUCCESS);
default:
usage();
exit(EXIT_FAILURE);
}
}
if (!actWrite && !actRead) {
fprintf(stderr, "Error: '-w' of '-r' must be used\n");
exit(EXIT_FAILURE);
}
if (actWrite && actRead) {
fprintf(stderr, "Error: '-w' and '-r' can not be use at same time\n");
exit(EXIT_FAILURE);
}
/* Init a SPHDE region: create and attach the control shared memory
* segment and locks. */
rc = SASJoinRegion();
if (rc != 0) {
fprintf(stderr, "error: SASJoinRegion: %d\n", rc);
exit(EXIT_FAILURE);
}
/* The Context memory block containing the key/pair associations. If
* it does not exist, create one. */
block = getSASFinder();
if (block != NULL) {
finderContext = (SPHContext_t)block;
} else {
finderContext = SPHContextCreate(block__Size256K);
setSASFinder(finderContext);
}
/* Try to get the block by a name, if it does not exists creates it */
block = (char*)SPHContextFindByName(finderContext, bufferKeyName);
if (!block) {
block = (char*)SASBlockAlloc(block__Size4K);
if (block == NULL) {
fprintf(stderr, "error: SASBlockAlloc\n");
SASCleanUp();
exit(EXIT_FAILURE);
}
rc = SPHContextAddName(finderContext, bufferKeyName, block);
if (!rc) {
fprintf(stderr, "SPHContextAddName(%p, %s, %p) failed: %i\n",
finderContext, bufferKeyName, block, rc);
SASCleanUp();
exit(1);
}
}
if (actRead) {
printf("Reading block '%s' : %s\n", bufferKeyName, block);
} else {
printf("Writing block '%s' : %s\n", bufferKeyName, block);
snprintf(block, block__Size256K, "%s", actToWrite);
}
SASCleanUp();
return 0;
}
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