/*
* 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();
}
static void
FileRepSubProcess_InitProcess(void)
{
SetProcessingMode(InitProcessing);
/*
* Create a resource owner to keep track of our resources
*/
CurrentResourceOwner = ResourceOwnerCreate(NULL,
FileRepProcessTypeToString[fileRepProcessType]);
InitXLOGAccess();
SetProcessingMode(NormalProcessing);
InitBufferPoolAccess();
/*
* Don't add Filerep backend subprocesses to the proc array.
*
* This avoids any deadlock situations during Filerep transition. E.g. If
* a normal backend has acquired ProcArrayLock and is waiting for Filerep
* transition to finish, the Filerep backend subprocesses will deadlock
* forever as they can't acquire the ProcArray lock to remove themselves
* from the ProcArray. This directly causes the transition to stall and
* thus the whole system.
*/
/*
* Initialize my entry in the shared-invalidation manager's array of
* per-backend data.
*
* Sets up MyBackendId, a unique backend identifier.
*/
MyBackendId = InvalidBackendId;
SharedInvalBackendInit(false);
if (MyBackendId > MaxBackends || MyBackendId <= 0)
elog(FATAL, "bad backend id: %d", MyBackendId);
/*
* bufmgr needs another initialization call too
*/
InitBufferPoolBackend();
}
