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Use dlist/dclist instead of PROC_QUEUE / SHM_QUEUE for heavyweight locks

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Part of a series to remove SHM_QUEUE. ilist.h style lists are more widely used
and have an easier to use interface.

As PROC_QUEUE is now unused, remove it.

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
This commit is contained in:
Andres Freund
2023-01-18 11:41:14 -08:00
parent 51384cc40c
commit 5764f611e1
7 changed files with 183 additions and 339 deletions
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17
src/include/storage/proc.h
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@@ -167,8 +167,8 @@ typedef enum
struct PGPROC
{
/* proc->links MUST BE FIRST IN STRUCT (see ProcSleep,ProcWakeup,etc) */
SHM_QUEUE links; /* list link if process is in a list */
PGPROC **procgloballist; /* procglobal list that owns this PGPROC */
dlist_node links; /* list link if process is in a list */
dlist_head *procgloballist; /* procglobal list that owns this PGPROC */
PGSemaphore sem; /* ONE semaphore to sleep on */
ProcWaitStatus waitStatus;
@@ -255,7 +255,7 @@ struct PGPROC
* linked into one of these lists, according to the partition number of
* their lock.
*/
SHM_QUEUE myProcLocks[NUM_LOCK_PARTITIONS];
dlist_head myProcLocks[NUM_LOCK_PARTITIONS];
XidCacheStatus subxidStatus; /* mirrored with
* ProcGlobal->subxidStates[i] */
@@ -385,13 +385,13 @@ typedef struct PROC_HDR
/* Length of allProcs array */
uint32 allProcCount;
/* Head of list of free PGPROC structures */
PGPROC *freeProcs;
dlist_head freeProcs;
/* Head of list of autovacuum's free PGPROC structures */
PGPROC *autovacFreeProcs;
dlist_head autovacFreeProcs;
/* Head of list of bgworker free PGPROC structures */
PGPROC *bgworkerFreeProcs;
dlist_head bgworkerFreeProcs;
/* Head of list of walsender free PGPROC structures */
PGPROC *walsenderFreeProcs;
dlist_head walsenderFreeProcs;
/* First pgproc waiting for group XID clear */
pg_atomic_uint32 procArrayGroupFirst;
/* First pgproc waiting for group transaction status update */
@@ -448,9 +448,8 @@ extern int GetStartupBufferPinWaitBufId(void);
extern bool HaveNFreeProcs(int n);
extern void ProcReleaseLocks(bool isCommit);
extern void ProcQueueInit(PROC_QUEUE *queue);
extern ProcWaitStatus ProcSleep(LOCALLOCK *locallock, LockMethod lockMethodTable);
extern PGPROC *ProcWakeup(PGPROC *proc, ProcWaitStatus waitStatus);
extern void ProcWakeup(PGPROC *proc, ProcWaitStatus waitStatus);
extern void ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock);
extern void CheckDeadLockAlert(void);
extern bool IsWaitingForLock(void);