ctdb/tests/src/ctdb_fetch_lock_once.c

   1 /*
   2    simple ctdb test tool
   3    This test just fetch_locks a record and releases it once.
   4
   5    Copyright (C) Ronnie Sahlberg 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/filesys.h"
  23 #include "popt.h"
  24 #include <poll.h>
  25 #include "ctdb.h"
  26
  27 #define TESTKEY "testkey"
  28
  29 static void rrl_cb(struct ctdb_db *ctdb_db,
  30                    struct ctdb_lock *lock, TDB_DATA outdata, void *private)
  31 {
  32         bool *rrl_cb_called = private;
  33
  34         printf("Record fetchlocked.\n");
  35         printf("Press enter to release the record ...\n");
  36         (void)getchar();
  37         printf("Record released.\n");
  38
  39         *rrl_cb_called = true;
  40         return;
  41 }
  42
  43 /*
  44         Just try locking/unlocking a single record once
  45 */
  46 static void fetch_lock_once(struct ctdb_connection *ctdb, struct ctdb_db *ctdb_db)
  47 {
  48         TDB_DATA key;
  49         bool rrl_cb_finished = false;
  50
  51         key.dptr = discard_const(TESTKEY);
  52         key.dsize = strlen(TESTKEY);
  53
  54         printf("Trying to fetch lock the record ...\n");
  55
  56         /* In the non-contended case the callback might be invoked
  57          * immediately, before ctdb_readrecordlock_async() returns.
  58          * In the contended case the callback will be invoked later.
  59          *
  60          * Normally an application would not care whether the callback
  61          * has already been invoked here or not, but if the application
  62          * needs to know, it can use the *private_data pointer
  63          * to pass data through to the callback and back.
  64          */
  65         if (!ctdb_readrecordlock_async(ctdb_db, key,
  66                                        rrl_cb, &rrl_cb_finished)) {
  67                 printf("Failed to send READRECORDLOCK\n");
  68                 exit(10);
  69         }
  70         while (!rrl_cb_finished) {
  71                 struct pollfd pfd;
  72
  73                 pfd.fd = ctdb_get_fd(ctdb);
  74                 pfd.events = ctdb_which_events(ctdb);
  75                 if (poll(&pfd, 1, -1) < 0) {
  76                         printf("Poll failed");
  77                         exit(10);
  78                 }
  79                 if (ctdb_service(ctdb, pfd.revents) < 0) {
  80                         printf("Failed to service\n");
  81                         exit(10);
  82                 }
  83         }
  84 }
  85
  86 /*
  87   main program
  88 */
  89 int main(int argc, const char *argv[])
  90 {
  91         struct ctdb_connection *ctdb;
  92         struct ctdb_db *ctdb_db;
  93
  94         struct poptOption popt_options[] = {
  95                 POPT_AUTOHELP
  96                 POPT_TABLEEND
  97         };
  98         int opt;
  99         const char **extra_argv;
 100         int extra_argc = 0;
 101         poptContext pc;
 102
 103         pc = poptGetContext(argv[0], argc, argv, popt_options, POPT_CONTEXT_KEEP_FIRST);
 104
 105         while ((opt = poptGetNextOpt(pc)) != -1) {
 106                 switch (opt) {
 107                 default:
 108                         fprintf(stderr, "Invalid option %s: %s\n",
 109                                 poptBadOption(pc, 0), poptStrerror(opt));
 110                         exit(1);
 111                 }
 112         }
 113
 114         /* setup the remaining options for the main program to use */
 115         extra_argv = poptGetArgs(pc);
 116         if (extra_argv) {
 117                 extra_argv++;
 118                 while (extra_argv[extra_argc]) extra_argc++;
 119         }
 120
 121         ctdb = ctdb_connect("/tmp/ctdb.socket",
 122                                        ctdb_log_file, stderr);
 123         if (!ctdb) {
 124                 printf("Connecting to /tmp/ctdb.socket\n");
 125                 exit(1);
 126         }
 127
 128         /* attach to a specific database */
 129         ctdb_db = ctdb_attachdb(ctdb, "test.tdb", false, 0);
 130         if (!ctdb_db) {
 131                 printf("ctdb_attachdb failed\n");
 132                 exit(1);
 133         }
 134
 135         printf("Waiting for cluster\n");
 136         while (1) {
 137                 uint32_t recmode=1;
 138                 ctdb_getrecmode(ctdb, CTDB_CURRENT_NODE, &recmode);
 139                 if (recmode == 0) break;
 140                 sleep(1);
 141         }
 142
 143         fetch_lock_once(ctdb, ctdb_db);
 144
 145         return 0;
 146 }