Remove SHM_QUEUE
Prior patches got rid of all the uses of SHM_QUEUE. ilist.h style lists are more widely used and have an easier to use interface. As there are no users left, remove SHM_QUEUE. Reviewed-by: Thomas Munro <thomas.munro@gmail.com> (in an older version) Discussion: https://postgr.es/m/20221120055930.t6kl3tyivzhlrzu2@awork3.anarazel.de Discussion: https://postgr.es/m/20200211042229.msv23badgqljrdg2@alap3.anarazel.de
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9600371764
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d137cb52cb
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@ -21,7 +21,6 @@ OBJS = \
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shm_mq.o \
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shm_toc.o \
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shmem.o \
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shmqueue.o \
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signalfuncs.o \
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sinval.o \
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sinvaladt.o \
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@ -13,7 +13,6 @@ backend_sources += files(
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'shm_mq.c',
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'shm_toc.c',
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'shmem.c',
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'shmqueue.c',
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'signalfuncs.c',
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'sinval.c',
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'sinvaladt.c',
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@ -1,190 +0,0 @@
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/*-------------------------------------------------------------------------
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*
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* shmqueue.c
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* shared memory linked lists
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*
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* Portions Copyright (c) 1996-2023, 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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*
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* IDENTIFICATION
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* src/backend/storage/ipc/shmqueue.c
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*
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* NOTES
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*
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* Package for managing doubly-linked lists in shared memory.
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* The only tricky thing is that SHM_QUEUE will usually be a field
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* in a larger record. SHMQueueNext has to return a pointer
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* to the record itself instead of a pointer to the SHMQueue field
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* of the record. It takes an extra parameter and does some extra
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* pointer arithmetic to do this correctly.
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*
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* NOTE: These are set up so they can be turned into macros some day.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "storage/shmem.h"
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/*
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* ShmemQueueInit -- make the head of a new queue point
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* to itself
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*/
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void
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SHMQueueInit(SHM_QUEUE *queue)
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{
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Assert(ShmemAddrIsValid(queue));
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queue->prev = queue->next = queue;
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}
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/*
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* SHMQueueIsDetached -- true if element is not currently
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* in a queue.
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*/
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bool
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SHMQueueIsDetached(const SHM_QUEUE *queue)
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{
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Assert(ShmemAddrIsValid(queue));
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return (queue->prev == NULL);
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}
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/*
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* SHMQueueElemInit -- clear an element's links
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*/
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void
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SHMQueueElemInit(SHM_QUEUE *queue)
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{
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Assert(ShmemAddrIsValid(queue));
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queue->prev = queue->next = NULL;
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}
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/*
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* SHMQueueDelete -- remove an element from the queue and
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* close the links
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*/
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void
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SHMQueueDelete(SHM_QUEUE *queue)
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{
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SHM_QUEUE *nextElem = queue->next;
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SHM_QUEUE *prevElem = queue->prev;
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Assert(ShmemAddrIsValid(queue));
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Assert(ShmemAddrIsValid(nextElem));
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Assert(ShmemAddrIsValid(prevElem));
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prevElem->next = queue->next;
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nextElem->prev = queue->prev;
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queue->prev = queue->next = NULL;
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}
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/*
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* SHMQueueInsertBefore -- put elem in queue before the given queue
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* element. Inserting "before" the queue head puts the elem
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* at the tail of the queue.
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*/
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void
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SHMQueueInsertBefore(SHM_QUEUE *queue, SHM_QUEUE *elem)
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{
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SHM_QUEUE *prevPtr = queue->prev;
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Assert(ShmemAddrIsValid(queue));
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Assert(ShmemAddrIsValid(elem));
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elem->next = prevPtr->next;
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elem->prev = queue->prev;
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queue->prev = elem;
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prevPtr->next = elem;
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}
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/*
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* SHMQueueInsertAfter -- put elem in queue after the given queue
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* element. Inserting "after" the queue head puts the elem
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* at the head of the queue.
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*/
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void
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SHMQueueInsertAfter(SHM_QUEUE *queue, SHM_QUEUE *elem)
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{
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SHM_QUEUE *nextPtr = queue->next;
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Assert(ShmemAddrIsValid(queue));
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Assert(ShmemAddrIsValid(elem));
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elem->prev = nextPtr->prev;
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elem->next = queue->next;
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queue->next = elem;
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nextPtr->prev = elem;
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}
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/*--------------------
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* SHMQueueNext -- Get the next element from a queue
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*
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* To start the iteration, pass the queue head as both queue and curElem.
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* Returns NULL if no more elements.
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*
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* Next element is at curElem->next. If SHMQueue is part of
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* a larger structure, we want to return a pointer to the
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* whole structure rather than a pointer to its SHMQueue field.
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* For example,
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* struct {
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* int stuff;
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* SHMQueue elem;
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* } ELEMType;
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* When this element is in a queue, prevElem->next points at struct.elem.
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* We subtract linkOffset to get the correct start address of the structure.
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*
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* calls to SHMQueueNext should take these parameters:
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* &(queueHead), &(queueHead), offsetof(ELEMType, elem)
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* or
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* &(queueHead), &(curElem->elem), offsetof(ELEMType, elem)
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*--------------------
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*/
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Pointer
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SHMQueueNext(const SHM_QUEUE *queue, const SHM_QUEUE *curElem, Size linkOffset)
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{
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SHM_QUEUE *elemPtr = curElem->next;
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Assert(ShmemAddrIsValid(curElem));
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if (elemPtr == queue) /* back to the queue head? */
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return NULL;
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return (Pointer) (((char *) elemPtr) - linkOffset);
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}
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/*--------------------
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* SHMQueuePrev -- Get the previous element from a queue
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*
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* Same as SHMQueueNext, just starting at tail and moving towards head.
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* All other comments and usage applies.
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*/
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Pointer
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SHMQueuePrev(const SHM_QUEUE *queue, const SHM_QUEUE *curElem, Size linkOffset)
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{
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SHM_QUEUE *elemPtr = curElem->prev;
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Assert(ShmemAddrIsValid(curElem));
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if (elemPtr == queue) /* back to the queue head? */
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return NULL;
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return (Pointer) (((char *) elemPtr) - linkOffset);
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}
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/*
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* SHMQueueEmpty -- true if queue head is only element, false otherwise
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*/
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bool
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SHMQueueEmpty(const SHM_QUEUE *queue)
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{
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Assert(ShmemAddrIsValid(queue));
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if (queue->prev == queue)
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{
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Assert(queue->next == queue);
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return true;
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}
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return false;
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}
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@ -24,13 +24,6 @@
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#include "utils/hsearch.h"
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/* shmqueue.c */
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typedef struct SHM_QUEUE
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{
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struct SHM_QUEUE *prev;
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struct SHM_QUEUE *next;
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} SHM_QUEUE;
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/* shmem.c */
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extern void InitShmemAccess(void *seghdr);
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extern void InitShmemAllocation(void);
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@ -63,19 +56,4 @@ typedef struct
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Size allocated_size; /* # bytes actually allocated */
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} ShmemIndexEnt;
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/*
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* prototypes for functions in shmqueue.c
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*/
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extern void SHMQueueInit(SHM_QUEUE *queue);
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extern void SHMQueueElemInit(SHM_QUEUE *queue);
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extern void SHMQueueDelete(SHM_QUEUE *queue);
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extern void SHMQueueInsertBefore(SHM_QUEUE *queue, SHM_QUEUE *elem);
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extern void SHMQueueInsertAfter(SHM_QUEUE *queue, SHM_QUEUE *elem);
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extern Pointer SHMQueueNext(const SHM_QUEUE *queue, const SHM_QUEUE *curElem,
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Size linkOffset);
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extern Pointer SHMQueuePrev(const SHM_QUEUE *queue, const SHM_QUEUE *curElem,
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Size linkOffset);
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extern bool SHMQueueEmpty(const SHM_QUEUE *queue);
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extern bool SHMQueueIsDetached(const SHM_QUEUE *queue);
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#endif /* SHMEM_H */
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@ -2377,7 +2377,6 @@ SERIALIZABLEXIDTAG
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SERVICE_STATUS
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SERVICE_STATUS_HANDLE
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SERVICE_TABLE_ENTRY
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SHM_QUEUE
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SID_AND_ATTRIBUTES
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SID_IDENTIFIER_AUTHORITY
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SID_NAME_USE
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