Shared state stored in the PostgreSQL shared-memory segment. More...

#include "provsql_shmem.h"

Public Attributes
LWLock *	lock
	Mutual-exclusion lock for pipe writes.
long	pipebmr
	Backend-to-worker pipe: read end (worker reads).
long	pipebmw
	Backend-to-worker pipe: write end (backends write).
long	pipembr
	Worker-to-backend pipe: read end (backends read).
long	pipembw
	Worker-to-backend pipe: write end (worker writes).
char	kcmcp_endpoint [256]
	Live endpoint of the managed KCMCP server ("" when none): written by the supervisor worker, read by the in-extension client.

Detailed Description

Shared state stored in the PostgreSQL shared-memory segment.

All backends and the background worker access this structure through the provsql_shared_state global pointer.

lock serialises gate-creation messages so that only one backend writes to the pipe at a time. The four long fields hold OS file descriptors for the two anonymous pipes:

pipebmr / pipebmw: requests, backend → worker (backends write)
pipembr / pipembw: replies, worker → backend (worker writes)

Definition at line 112 of file provsql_shmem.h.

Member Data Documentation

◆ kcmcp_endpoint

char provsqlSharedState::kcmcp_endpoint[256]

Live endpoint of the managed KCMCP server ("" when none): written by the supervisor worker, read by the in-extension client.

Definition at line 119 of file provsql_shmem.h.

◆ lock

LWLock* provsqlSharedState::lock

Mutual-exclusion lock for pipe writes.

Definition at line 114 of file provsql_shmem.h.

◆ pipebmr

long provsqlSharedState::pipebmr

Backend-to-worker pipe: read end (worker reads).

Definition at line 115 of file provsql_shmem.h.

◆ pipebmw

long provsqlSharedState::pipebmw

Backend-to-worker pipe: write end (backends write).

Definition at line 116 of file provsql_shmem.h.

◆ pipembr

long provsqlSharedState::pipembr

Worker-to-backend pipe: read end (backends read).

Definition at line 117 of file provsql_shmem.h.

◆ pipembw

long provsqlSharedState::pipembw

Worker-to-backend pipe: write end (worker writes).

Definition at line 118 of file provsql_shmem.h.

The documentation for this struct was generated from the following file:

/home/pierre/git/software/provsql/src/provsql_shmem.h

Public Attributes