Shows how to access a database with multiple threads.
/*- * Copyright (c) 2008-2012 WiredTiger, Inc. * * This is free and unencumbered software released into the public domain. * * Anyone is free to copy, modify, publish, use, compile, sell, or * distribute this software, either in source code form or as a compiled * binary, for any purpose, commercial or non-commercial, and by any * means. * * In jurisdictions that recognize copyright laws, the author or authors * of this software dedicate any and all copyright interest in the * software to the public domain. We make this dedication for the benefit * of the public at large and to the detriment of our heirs and * successors. We intend this dedication to be an overt act of * relinquishment in perpetuity of all present and future rights to this * software under copyright law. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * ex_thread.c * This is an example demonstrating how to create and access a simple * table from multiple threads. */ #include <stdio.h> #include <string.h> #include <pthread.h> #include <wiredtiger.h> void *scan_thread(void *arg); const char *home = "WT_TEST"; #define NUM_THREADS 10 WT_CONNECTION *conn; void * scan_thread(void *arg) { WT_SESSION *session; WT_CURSOR *cursor; const char *key, *value; int ret; ret = conn->open_session(conn, NULL, NULL, &session); ret = session->open_cursor(session, "table:access", NULL, NULL, &cursor); /* Show all records. */ while ((ret = cursor->next(cursor)) == 0) { ret = cursor->get_key(cursor, &key); ret = cursor->get_value(cursor, &value); printf("Got record: %s : %s\n", key, value); } return (arg); } int main(void) { WT_SESSION *session; WT_CURSOR *cursor; pthread_t threads[NUM_THREADS]; int i, ret; if ((ret = wiredtiger_open(home, NULL, "create", &conn)) != 0) fprintf(stderr, "Error connecting to %s: %s\n", home, wiredtiger_strerror(ret)); /* Note: further error checking omitted for clarity. */ ret = conn->open_session(conn, NULL, NULL, &session); ret = session->create(session, "table:access", "key_format=S,value_format=S"); ret = session->open_cursor(session, "table:access", NULL, "overwrite", &cursor); cursor->set_key(cursor, "key1"); cursor->set_value(cursor, "value1"); ret = cursor->insert(cursor); ret = session->close(session, NULL); for (i = 0; i < NUM_THREADS; i++) ret = pthread_create(&threads[i], NULL, scan_thread, NULL); for (i = 0; i < NUM_THREADS; i++) ret = pthread_join(threads[i], NULL); ret = conn->close(conn, NULL); return (ret); }