/*
* Early initialization of a backend (either standalone or under postmaster).
* This happens even before InitPostgres.
*
* This is separate from InitPostgres because it is also called by auxiliary
* processes, such as the background writer process, which may not call
* InitPostgres at all.
*/
void
BaseInit(void)
{
/*
* Attach to shared memory and semaphores, and initialize our
* input/output/debugging file descriptors.
*/
InitCommunication();
DebugFileOpen();
/* Do local initialization of file, storage and buffer managers */
InitFileAccess();
smgrinit();
InitBufferPoolAccess();
}
void
InitPostgres(char *name) /* database name */
{
bool bootstrap; /* true if BootstrapProcessing */
/* ----------------
* see if we're running in BootstrapProcessing mode
* ----------------
*/
bootstrap = IsBootstrapProcessingMode();
/* ----------------
* turn on the exception handler. Note: we cannot use elog, Assert,
* AssertState, etc. until after exception handling is on.
* ----------------
*/
EnableExceptionHandling(true);
/* ----------------
* A stupid check to make sure we don't call this more than once.
* But things like ReinitPostgres() get around this by just diddling
* the PostgresIsInitialized flag.
* ----------------
*/
AssertState(!PostgresIsInitialized);
/* ----------------
* Memory system initialization.
* (we may call palloc after EnableMemoryContext())
*
* Note EnableMemoryContext() must happen before EnablePortalManager().
* ----------------
*/
EnableMemoryContext(true); /* initializes the "top context" */
EnablePortalManager(true); /* memory for portal/transaction stuff */
/* ----------------
* initialize the backend local portal stack used by
* internal PQ function calls. see src/lib/libpq/be-dumpdata.c
* This is different from the "portal manager" so this goes here.
* -cim 2/12/91
* ----------------
*/
be_portalinit();
/* ----------------
* attach to shared memory and semaphores, and initialize our
* input/output/debugging file descriptors.
* ----------------
*/
InitCommunication();
InitStdio();
/*
* initialize the local buffer manager
*/
InitLocalBuffer();
if (!TransactionFlushEnabled())
on_exitpg(FlushBufferPool, (caddr_t) NULL);
/* ----------------
* check for valid "meta gunk" (??? -cim 10/5/90) and change to
* database directory.
*
* Note: DatabaseName, MyDatabaseName, and DatabasePath are all
* initialized with DatabaseMetaGunkIsConsistent(), strncpy() and
* DoChdirAndInitDatabase() below! XXX clean this crap up!
* -cim 10/5/90
* ----------------
*/
{
char myPath[MAXPGPATH] = "."; /* DatabasePath points here! */
/* ----------------
* DatabaseMetaGunkIsConsistent fills in myPath, but what about
* when bootstrap or Noversion is true?? -cim 10/5/90
* ----------------
*/
if (! bootstrap &&
! DatabaseMetaGunkIsConsistent(name, myPath) &&
! Noversion) {
elog(NOTICE, "InitPostgres: could not locate valid PG_VERSION\n");
elog(NOTICE, "files for %s and %s.", DataDir, name);
elog(FATAL, "Have you run initdb/createdb and set PGDATA properly?");
}
/* ----------------
* ok, we've figured out myName and myPath, now save these
* and chdir to myPath.
* ----------------
*/
DoChdirAndInitDatabaseNameAndPath(name, myPath);
}
/* ********************************
* code after this point assumes we are in the proper directory!
* ********************************
*/
/* ----------------
* initialize the database id used for system caches and lock tables
* ----------------
*/
InitMyDatabaseId();
smgrinit();
/* ----------------
* initialize the transaction system and the relation descriptor
* cache. Note we have to make certain the lock manager is off while
* we do this.
* ----------------
*/
AmiTransactionOverride(IsBootstrapProcessingMode());
LockDisable(true);
/*
* Part of the initialization processing done here sets a read
* lock on pg_log. Since locking is disabled the set doesn't have
* intended effect of locking out writers, but this is ok, since
* we only lock it to examine AMI transaction status, and this is
* never written after initdb is done. -mer 15 June 1992
*/
RelationInitialize(); /* pre-allocated reldescs created here */
InitializeTransactionSystem(); /* pg_log,etc init/crash recovery here */
LockDisable(false);
/* ----------------
* anyone knows what this does? something having to do with
* system catalog cache invalidation in the case of multiple
* backends, I think -cim 10/3/90
* Sets up MyBackendId a unique backend identifier.
* ----------------
*/
InitSharedInvalidationState();
/* ----------------
* Set up a per backend process in shared memory. Must be done after
* InitSharedInvalidationState() as it relies on MyBackendId being
* initialized already. XXX -mer 11 Aug 1991
* ----------------
*/
InitProcess(PostgresIpcKey);
if (MyBackendId > MaxBackendId || MyBackendId <= 0) {
elog(FATAL, "cinit2: bad backend id %d (%d)",
MyBackendTag,
MyBackendId);
}
/* ----------------
* initialize the access methods.
* ----------------
*/
initam();
/* ----------------
* initialize all the system catalog caches.
* ----------------
*/
zerocaches();
InitCatalogCache();
/* ----------------
* set ourselves to the proper user id and figure out our postgres
* user id. If we ever add security so that we check for valid
* postgres users, we might do it here.
* ----------------
*/
InitUserid();
/* ----------------
* ok, all done, now let's make sure we don't do it again.
* ----------------
*/
PostgresIsInitialized = true;
/* on_exitpg(DestroyLocalRelList, (caddr_t) NULL); */
/* ----------------
* Done with "InitPostgres", now change to NormalProcessing unless
* we're in BootstrapProcessing mode.
* ----------------
*/
if (!bootstrap)
SetProcessingMode(NormalProcessing);
/* if (testFlag || lockingOff) */
if (lockingOff)
LockDisable(true);
}