Example program with subcommits

git-svn-id: file:///svn/tokudb@495 c7de825b-a66e-492c-adef-691d508d4ae1

bdb-examples/Makefile

+LDFLAGS = -ldb

bdb-examples/subcommit.c

+#include <db.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <assert.h>
+#include <string.h>
+
+#define DIR "subcommit.dir"
+
+DB_ENV *env;
+DB *db;
+DB_TXN *txn=0;
+
+int main (int argc, char *argv[]) {
+    int r;
+    int i;
+    r = system("rm -rf ./" DIR);
+    r = mkdir(DIR, 0777);                assert(r==0);
+    r = db_env_create(&env, 0);          assert(r==0);
+    r = env->open(env, DIR, DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_CREATE|DB_THREAD|DB_RECOVER|DB_PRIVATE, 0666); assert(r==0);
+    r = db_create(&db, env, 0);          assert(r==0);
+    r = env->txn_begin(env, 0, &txn, 0); assert(r==0);
+    r = db->open(db, txn, "t1.db", "main", DB_BTREE, DB_CREATE|DB_THREAD | (txn ? 0 : DB_AUTO_COMMIT), 0660); assert(r==0);
+    for (i=0; i<1000; i++) {
+	DB_TXN *subtxn;
+	DBT a,b;
+	int data=htonl(i);
+	r = env->txn_begin(env, txn, &subtxn, 0); assert(r==0);
+	memset(&a, 0, sizeof(a));
+	memset(&b, 0, sizeof(b));
+	a.data  = b.data  = &data;
+	a.flags = b.flags = 0;
+	a.ulen  = b.ulen  = 0;
+	a.size  = b.size   =  sizeof(data);
+	r = db->put(db, subtxn, &a, &b, 0); if (r!=0) db->err(db, r, "%s:%d", __FILE__, __LINE__); assert(r==0);
+	r = subtxn->commit(subtxn, 0);      assert(r==0);
+    }
+    if (txn) {
+	r = txn->commit(txn, 0); assert(r==0);
+    }
+    r = db->close(db, 0);    assert(r==0);
+    r = env->close(env, 0);  assert(r==0);
+    return 0;
+}