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
	Background-to-main pipe: read end (worker reads)

long	pipebmw
	Background-to-main pipe: write end (worker writes)

long	pipembr
	Main-to-background pipe: read end (worker reads)

long	pipembw
	Main-to-background pipe: write end (backend writes)

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:

pipembr / pipembw: main-backend → background (write end in main)
pipebmr / pipebmw: background → main-backend (write end in worker)

Definition at line 74 of file provsql_shmem.h.

Member Data Documentation

◆ lock

LWLock* provsqlSharedState::lock

Mutual-exclusion lock for pipe writes.

Definition at line 76 of file provsql_shmem.h.

◆ pipebmr

long provsqlSharedState::pipebmr

Background-to-main pipe: read end (worker reads)

Definition at line 77 of file provsql_shmem.h.

◆ pipebmw

long provsqlSharedState::pipebmw

Background-to-main pipe: write end (worker writes)

Definition at line 78 of file provsql_shmem.h.

◆ pipembr

long provsqlSharedState::pipembr

Main-to-background pipe: read end (worker reads)

Definition at line 79 of file provsql_shmem.h.

◆ pipembw

long provsqlSharedState::pipembw

Main-to-background pipe: write end (backend writes)

Definition at line 80 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