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Improve some global variable declarations

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We have in launch_backend.c:

    /*
     * The following need to be available to the save/restore_backend_variables
     * functions.  They are marked NON_EXEC_STATIC in their home modules.
     */
    extern slock_t *ShmemLock;
    extern slock_t *ProcStructLock;
    extern PGPROC *AuxiliaryProcs;
    extern PMSignalData *PMSignalState;
    extern pg_time_t first_syslogger_file_time;
    extern struct bkend *ShmemBackendArray;
    extern bool redirection_done;

That comment is not completely true: ShmemLock, ShmemBackendArray, and
redirection_done are not in fact NON_EXEC_STATIC.  ShmemLock once was,
but was then needed elsewhere.  ShmemBackendArray was static inside
postmaster.c before launch_backend.c was created.  redirection_done
was never static.

This patch moves the declaration of ShmemLock and redirection_done to
a header file.

ShmemBackendArray gets a NON_EXEC_STATIC.  This doesn't make a
difference, since it only exists if EXEC_BACKEND anyway, but it makes
it consistent.

After that, the comment is now correct.

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-07-02 06:55:56 +02:00
parent 881455e57b
commit 8f8bcb8883
7 changed files with 5 additions and 10 deletions
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4
src/backend/storage/lmgr/lwlock.c
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@@ -91,9 +91,6 @@
#endif
/* We use the ShmemLock spinlock to protect LWLockCounter */
extern slock_t *ShmemLock;
#define LW_FLAG_HAS_WAITERS ((uint32) 1 << 30)
#define LW_FLAG_RELEASE_OK ((uint32) 1 << 29)
#define LW_FLAG_LOCKED ((uint32) 1 << 28)
@@ -609,6 +606,7 @@ LWLockNewTrancheId(void)
int *LWLockCounter;
LWLockCounter = (int *) ((char *) MainLWLockArray - sizeof(int));
/* We use the ShmemLock spinlock to protect LWLockCounter */
SpinLockAcquire(ShmemLock);
result = (*LWLockCounter)++;
SpinLockRelease(ShmemLock);