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We want to support a "noreturn" decoration on more compilers besides
just GCC-compatible ones, but for that we need to move the decoration
in front of the function declaration instead of either behind it or
wherever, which is the current style afforded by GCC-style attributes.
Also rename the macro to "pg_noreturn" to be similar to the C11
standard "noreturn".
pg_noreturn is now supported on all compilers that support C11 (using
_Noreturn), as well as GCC-compatible ones (using __attribute__, as
before), as well as MSVC (using __declspec). (When PostgreSQL
requires C11, the latter two variants can be dropped.)
Now, all supported compilers effectively support pg_noreturn, so the
extra code for !HAVE_PG_ATTRIBUTE_NORETURN can be dropped.
This also fixes a possible problem if third-party code includes
stdnoreturn.h, because then the current definition of
#define pg_attribute_noreturn() __attribute__((noreturn))
would cause an error.
Note that the C standard does not support a noreturn attribute on
function pointer types. So we have to drop these here. There are
only two instances at this time, so it's not a big loss. In one case,
we can make up for it by adding the pg_noreturn to a wrapper function
and adding a pg_unreachable(), in the other case, the latter was
already done before.
Reviewed-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/pxr5b3z7jmkpenssra5zroxi7qzzp6eswuggokw64axmdixpnk@zbwxuq7gbbcw
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/*--------------------------------------------------------------------
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* bgworker_internals.h
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* POSTGRES pluggable background workers internals
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*
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* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/postmaster/bgworker_internals.h
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*--------------------------------------------------------------------
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*/
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#ifndef BGWORKER_INTERNALS_H
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#define BGWORKER_INTERNALS_H
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#include "datatype/timestamp.h"
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#include "lib/ilist.h"
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#include "postmaster/bgworker.h"
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/* GUC options */
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/*
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* Maximum possible value of parallel workers.
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*/
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#define MAX_PARALLEL_WORKER_LIMIT 1024
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/*
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* List of background workers, private to postmaster.
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*
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* All workers that are currently running will also have an entry in
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* ActiveChildList.
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*/
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typedef struct RegisteredBgWorker
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{
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BackgroundWorker rw_worker; /* its registry entry */
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pid_t rw_pid; /* 0 if not running */
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TimestampTz rw_crashed_at; /* if not 0, time it last crashed */
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int rw_shmem_slot;
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bool rw_terminate;
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dlist_node rw_lnode; /* list link */
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} RegisteredBgWorker;
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extern PGDLLIMPORT dlist_head BackgroundWorkerList;
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extern Size BackgroundWorkerShmemSize(void);
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extern void BackgroundWorkerShmemInit(void);
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extern void BackgroundWorkerStateChange(bool allow_new_workers);
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extern void ForgetBackgroundWorker(RegisteredBgWorker *rw);
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extern void ReportBackgroundWorkerPID(RegisteredBgWorker *rw);
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extern void ReportBackgroundWorkerExit(RegisteredBgWorker *rw);
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extern void BackgroundWorkerStopNotifications(pid_t pid);
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extern void ForgetUnstartedBackgroundWorkers(void);
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extern void ResetBackgroundWorkerCrashTimes(void);
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/* Entry point for background worker processes */
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pg_noreturn extern void BackgroundWorkerMain(const void *startup_data, size_t startup_data_len);
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#endif /* BGWORKER_INTERNALS_H */
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