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A lower-level transaction API and a transaction command in the shell

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This commit is contained in:
Krasimir Angelov
2022-10-24 10:44:40 +02:00
parent 4b2e5d2f4c
commit d784e2584b
10 changed files with 310 additions and 187 deletions
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28
src/runtime/c/pgf/db.cxx
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@@ -1428,9 +1428,19 @@ void PgfDB::start_transaction()
last_free_block_txn_id = 0;
}
PGF_INTERNAL
void PgfDB::set_transaction_object(object o)
{
transaction_object = o;
}
PGF_INTERNAL
void PgfDB::commit(object o)
{
if (transaction_object != o) {
return;
}
if (last_free_block != 0) {
free_blocks = insert_block_descriptor(free_blocks,
last_free_block,
@@ -1450,7 +1460,7 @@ void PgfDB::commit(object o)
int res;
#ifndef _WIN32
#ifndef MREMAP_MAYMOVE
if (current_db->fd < 0) {
if (fd < 0) {
ms->active_revision = o;
ms->top = top;
ms->free_blocks = free_blocks;
@@ -1501,7 +1511,7 @@ void PgfDB::commit(object o)
pthread_mutex_unlock(&ms->write_mutex);
#else
if (current_db->fd > 0) {
if (fd > 0) {
if (free_descriptors[2] != 0) {
ptr(block_descr,free_descriptors[2])->chain = free_descriptors[0];
free_descriptors[0] = free_descriptors[1];
@@ -1529,12 +1539,19 @@ void PgfDB::commit(object o)
ReleaseMutex(hWriteMutex);
#endif
transaction_object = 0;
}
PGF_INTERNAL
void PgfDB::rollback()
void PgfDB::rollback(object o)
{
if (transaction_object != o) {
return;
}
top = ms->top;
transaction_object = 0;
free_blocks = ms->free_blocks;
free_descriptors[0] = ms->free_descriptors;
free_descriptors[1] = 0;
@@ -1798,6 +1815,11 @@ void PgfDB::resize_map(size_t new_size, bool writeable)
#endif
}
bool PgfDB::is_transient_object(object o)
{
return o > ms->top;
}
DB_scope::DB_scope(PgfDB *db, DB_scope_mode m)
{
db->lock(m);