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This adds optional support for locking based on shared robust mutexes. The caller can use the TDB_MUTEX_LOCKING flag together with TDB_CLEAR_IF_FIRST after verifying with tdb_runtime_check_for_robust_mutexes() that it's supported by the current system. The caller should be aware that using TDB_MUTEX_LOCKING implies some limitations, e.g. it's not possible to have multiple read chainlocks on a given hash chain from multiple processes. Note: that this doesn't make tdb thread safe! Pair-Programmed-With: Stefan Metzmacher <metze@samba.org> Pair-Programmed-With: Michael Adam <obnox@samba.org> Signed-off-by: Volker Lendecke <vl@samba.org> Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
#include "../common/tdb_private.h"
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#include "lock-tracking.h"
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#define fcntl fcntl_with_lockcheck
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#include "../common/io.c"
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#include "../common/tdb.c"
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#include "../common/lock.c"
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#include "../common/freelist.c"
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#include "../common/traverse.c"
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#include "../common/transaction.c"
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#include "../common/error.c"
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#include "../common/open.c"
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#include "../common/check.c"
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#include "../common/hash.c"
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#include "../common/mutex.c"
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#include "tap-interface.h"
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#include <stdlib.h>
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#include "logging.h"
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#undef fcntl
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#define NUM_ENTRIES 10
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static bool prepare_entries(struct tdb_context *tdb)
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{
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unsigned int i;
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TDB_DATA key, data;
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for (i = 0; i < NUM_ENTRIES; i++) {
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key.dsize = sizeof(i);
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key.dptr = (void *)&i;
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data.dsize = strlen("world");
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data.dptr = discard_const_p(uint8_t, "world");
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if (tdb_store(tdb, key, data, 0) != 0)
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return false;
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}
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return true;
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}
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static void delete_entries(struct tdb_context *tdb)
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{
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unsigned int i;
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TDB_DATA key;
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for (i = 0; i < NUM_ENTRIES; i++) {
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key.dsize = sizeof(i);
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key.dptr = (void *)&i;
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ok1(tdb_delete(tdb, key) == 0);
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}
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}
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/* We don't know how many times this will run. */
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static int delete_other(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data,
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void *private_data)
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{
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unsigned int i;
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memcpy(&i, key.dptr, 4);
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i = (i + 1) % NUM_ENTRIES;
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key.dptr = (void *)&i;
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if (tdb_delete(tdb, key) != 0)
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(*(int *)private_data)++;
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return 0;
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}
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static int delete_self(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data,
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void *private_data)
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{
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ok1(tdb_delete(tdb, key) == 0);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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struct tdb_context *tdb;
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int errors = 0;
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plan_tests(41);
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tdb = tdb_open_ex("run-no-lock-during-traverse.tdb",
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1024, TDB_CLEAR_IF_FIRST, O_CREAT|O_TRUNC|O_RDWR,
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0600, &taplogctx, NULL);
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ok1(tdb);
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ok1(prepare_entries(tdb));
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ok1(locking_errors == 0);
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ok1(tdb_lockall(tdb) == 0);
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ok1(locking_errors == 0);
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tdb_traverse(tdb, delete_other, &errors);
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ok1(errors == 0);
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ok1(locking_errors == 0);
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ok1(tdb_unlockall(tdb) == 0);
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ok1(prepare_entries(tdb));
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ok1(locking_errors == 0);
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ok1(tdb_lockall(tdb) == 0);
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ok1(locking_errors == 0);
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tdb_traverse(tdb, delete_self, NULL);
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ok1(locking_errors == 0);
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ok1(tdb_unlockall(tdb) == 0);
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ok1(prepare_entries(tdb));
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ok1(locking_errors == 0);
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ok1(tdb_lockall(tdb) == 0);
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ok1(locking_errors == 0);
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delete_entries(tdb);
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ok1(locking_errors == 0);
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ok1(tdb_unlockall(tdb) == 0);
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ok1(tdb_close(tdb) == 0);
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return exit_status();
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}
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