#include "lib/dshash.h"
#include "storage/lwlock.h"
#include "lib/simplehash.h"

Include dependency graph for pg_stash_advice.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	pgsa_entry_key

struct	pgsa_entry

struct	pgsa_stash

struct	pgsa_shared_state

struct	pgsa_stash_name

Macros
#define	PGSA_DUMP_FILE "pg_stash_advice.tsv"

#define	SH_PREFIX pgsa_stash_name_table

#define	SH_ELEMENT_TYPE pgsa_stash_name

#define	SH_KEY_TYPE uint64

#define	SH_SCOPE extern

#define	SH_DECLARE

Typedefs
typedef struct pgsa_entry_key	pgsa_entry_key

typedef struct pgsa_entry	pgsa_entry

typedef struct pgsa_stash	pgsa_stash

typedef struct pgsa_shared_state	pgsa_shared_state

typedef struct pgsa_stash_name	pgsa_stash_name

Functions
void	pgsa_attach (void)

void	pgsa_check_lockout (void)

void	pgsa_check_stash_name (char *stash_name)

void	pgsa_clear_advice_string (char *stash_name, int64 queryId)

void	pgsa_create_stash (char *stash_name)

void	pgsa_drop_stash (char *stash_name)

uint64	pgsa_lookup_stash_id (char *stash_name)

void	pgsa_reset_all_stashes (void)

void	pgsa_set_advice_string (char stash_name, int64 queryId, char advice_string)

void	pgsa_start_worker (void)

Variables
pgsa_shared_state *	pgsa_state

dsa_area *	pgsa_dsa_area

dshash_table *	pgsa_stash_dshash

dshash_table *	pgsa_entry_dshash

bool	pg_stash_advice_persist

int	pg_stash_advice_persist_interval

Macro Definition Documentation

◆ PGSA_DUMP_FILE

#define PGSA_DUMP_FILE "pg_stash_advice.tsv"

Definition at line 25 of file pg_stash_advice.h.

◆ SH_DECLARE

#define SH_DECLARE

Definition at line 85 of file pg_stash_advice.h.

◆ SH_ELEMENT_TYPE

#define SH_ELEMENT_TYPE pgsa_stash_name

Definition at line 82 of file pg_stash_advice.h.

◆ SH_KEY_TYPE

#define SH_KEY_TYPE uint64

Definition at line 83 of file pg_stash_advice.h.

◆ SH_PREFIX

#define SH_PREFIX pgsa_stash_name_table

Definition at line 81 of file pg_stash_advice.h.

◆ SH_SCOPE

#define SH_SCOPE extern

Definition at line 84 of file pg_stash_advice.h.

Typedef Documentation

◆ pgsa_entry

typedef struct pgsa_entry pgsa_entry

◆ pgsa_entry_key

typedef struct pgsa_entry_key pgsa_entry_key

◆ pgsa_shared_state

typedef struct pgsa_shared_state pgsa_shared_state

◆ pgsa_stash

typedef struct pgsa_stash pgsa_stash

◆ pgsa_stash_name

typedef struct pgsa_stash_name pgsa_stash_name

Function Documentation

◆ pgsa_attach()

void pgsa_attach ( void )

extern

Definition at line 224 of file pg_stash_advice.c.

{
    bool        found;
    MemoryContext oldcontext;
 
    /*
     * Create a memory context to make sure that any control structures
     * allocated in local memory are sufficiently persistent.
     */
    if (pg_stash_advice_mcxt == NULL)
        pg_stash_advice_mcxt = AllocSetContextCreate(TopMemoryContext,
                                                     "pg_stash_advice",
                                                     ALLOCSET_DEFAULT_SIZES);
    oldcontext = MemoryContextSwitchTo(pg_stash_advice_mcxt);
 
    /* Attach to the fixed-size state object if not already done. */
    if (pgsa_state == NULL)
        pgsa_state = GetNamedDSMSegment("pg_stash_advice",
                                        sizeof(pgsa_shared_state),
                                        pgsa_init_shared_state,
                                        &found, NULL);
 
    /* Attach to the DSA area if not already done. */
    if (pgsa_dsa_area == NULL)
    {
        dsa_handle  area_handle;
 
        LWLockAcquire(&pgsa_state->lock, LW_EXCLUSIVE);
        area_handle = pgsa_state->area;
        if (area_handle == DSA_HANDLE_INVALID)
        {
            pgsa_dsa_area = dsa_create(pgsa_state->dsa_tranche);
            dsa_pin(pgsa_dsa_area);
            pgsa_state->area = dsa_get_handle(pgsa_dsa_area);
            LWLockRelease(&pgsa_state->lock);
        }
        else
        {
            LWLockRelease(&pgsa_state->lock);
            pgsa_dsa_area = dsa_attach(area_handle);
        }
        dsa_pin_mapping(pgsa_dsa_area);
    }
 
    /* Attach to the stash_name->stash_id hash table if not already done. */
    if (pgsa_stash_dshash == NULL)
    {
        dshash_table_handle stash_handle;
 
        LWLockAcquire(&pgsa_state->lock, LW_EXCLUSIVE);
        pgsa_stash_dshash_parameters.tranche_id = pgsa_state->stash_tranche;
        stash_handle = pgsa_state->stash_hash;
        if (stash_handle == DSHASH_HANDLE_INVALID)
        {
            pgsa_stash_dshash = dshash_create(pgsa_dsa_area,
                                              &pgsa_stash_dshash_parameters,
                                              NULL);
            pgsa_state->stash_hash =
                dshash_get_hash_table_handle(pgsa_stash_dshash);
            LWLockRelease(&pgsa_state->lock);
        }
        else
        {
            LWLockRelease(&pgsa_state->lock);
            pgsa_stash_dshash = dshash_attach(pgsa_dsa_area,
                                              &pgsa_stash_dshash_parameters,
                                              stash_handle, NULL);
        }
    }
 
    /* Attach to the entry hash table if not already done. */
    if (pgsa_entry_dshash == NULL)
    {
        dshash_table_handle entry_handle;
 
        LWLockAcquire(&pgsa_state->lock, LW_EXCLUSIVE);
        pgsa_entry_dshash_parameters.tranche_id = pgsa_state->entry_tranche;
        entry_handle = pgsa_state->entry_hash;
        if (entry_handle == DSHASH_HANDLE_INVALID)
        {
            pgsa_entry_dshash = dshash_create(pgsa_dsa_area,
                                              &pgsa_entry_dshash_parameters,
                                              NULL);
            pgsa_state->entry_hash =
                dshash_get_hash_table_handle(pgsa_entry_dshash);
            LWLockRelease(&pgsa_state->lock);
        }
        else
        {
            LWLockRelease(&pgsa_state->lock);
            pgsa_entry_dshash = dshash_attach(pgsa_dsa_area,
                                              &pgsa_entry_dshash_parameters,
                                              entry_handle, NULL);
        }
    }
 
    /* Restore previous memory context. */
    MemoryContextSwitchTo(oldcontext);
}

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, pgsa_shared_state::area, dsa_attach(), dsa_create, dsa_get_handle(), DSA_HANDLE_INVALID, dsa_pin(), dsa_pin_mapping(), pgsa_shared_state::dsa_tranche, dshash_attach(), dshash_create(), dshash_get_hash_table_handle(), DSHASH_HANDLE_INVALID, pgsa_shared_state::entry_hash, pgsa_shared_state::entry_tranche, fb(), GetNamedDSMSegment(), pgsa_shared_state::lock, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MemoryContextSwitchTo(), pg_stash_advice_mcxt, pgsa_dsa_area, pgsa_entry_dshash, pgsa_entry_dshash_parameters, pgsa_init_shared_state(), pgsa_stash_dshash, pgsa_stash_dshash_parameters, pgsa_state, pgsa_shared_state::stash_hash, pgsa_shared_state::stash_tranche, TopMemoryContext, and dshash_parameters::tranche_id.

Referenced by pg_create_advice_stash(), pg_drop_advice_stash(), pg_get_advice_stash_contents(), pg_get_advice_stashes(), pg_set_stashed_advice(), pg_start_stash_advice_worker(), pg_stash_advice_worker_main(), and pgsa_advisor().

◆ pgsa_check_lockout()

void pgsa_check_lockout ( void )

extern

Definition at line 328 of file pg_stash_advice.c.

{
    if (pg_atomic_unlocked_test_flag(&pgsa_state->stashes_ready))
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("stash modifications are not allowed because \"%s\" has not been loaded yet",
                        PGSA_DUMP_FILE)));
}

References ereport, errcode(), errmsg, ERROR, fb(), pg_atomic_unlocked_test_flag(), PGSA_DUMP_FILE, pgsa_state, and pgsa_shared_state::stashes_ready.

Referenced by pg_create_advice_stash(), pg_drop_advice_stash(), and pg_set_stashed_advice().

◆ pgsa_check_stash_name()

void pgsa_check_stash_name ( char * stash_name )

extern

Definition at line 343 of file pg_stash_advice.c.

{
    /* Reject empty advice stash name. */
    if (stash_name[0] == '\0')
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash name may not be zero length"));
 
    /* Reject overlong advice stash names. */
    if (strlen(stash_name) + 1 > NAMEDATALEN)
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash names may not be longer than %d bytes",
                       NAMEDATALEN - 1));
 
    /*
     * Reject non-ASCII advice stash names, since advice stashes are visible
     * across all databases and the encodings of those databases might differ.
     */
    if (!pg_is_ascii(stash_name))
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash name must not contain non-ASCII characters"));
 
    /*
     * Reject things that do not look like identifiers, since the ability to
     * create an advice stash with non-printable characters or weird symbols
     * in the name is not likely to be useful to anyone.
     */
    if (!pgsa_is_identifier(stash_name))
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash name must begin with a letter or underscore and contain only letters, digits, and underscores"));
}

References ereport, errcode(), errmsg, ERROR, fb(), NAMEDATALEN, pg_is_ascii(), and pgsa_is_identifier().

Referenced by pg_create_advice_stash(), pg_drop_advice_stash(), pg_get_advice_stash_contents(), and pg_set_stashed_advice().

◆ pgsa_clear_advice_string()

void pgsa_clear_advice_string	(	char *	stash_name,
		int64	queryId
	)

extern

Definition at line 450 of file pg_stash_advice.c.

{
    pgsa_entry *entry;
    pgsa_entry_key key;
    uint64      stash_id;
    dsa_pointer old_dp;
 
    Assert(LWLockHeldByMe(&pgsa_state->lock));
 
    /* Translate the stash name to an integer ID. */
    if ((stash_id = pgsa_lookup_stash_id(stash_name)) == 0)
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash \"%s\" does not exist", stash_name));
 
    /*
     * Look for an existing entry, and free it. But, be sure to save the
     * pointer to the associated advice string, if any.
     */
    memset(&key, 0, sizeof(pgsa_entry_key));
    key.pgsa_stash_id = stash_id;
    key.queryId = queryId;
    entry = dshash_find(pgsa_entry_dshash, &key, true);
    if (entry == NULL)
        old_dp = InvalidDsaPointer;
    else
    {
        old_dp = entry->advice_string;
        dshash_delete_entry(pgsa_entry_dshash, entry);
    }
 
    /* Now we free the advice string as well, if there was one. */
    if (old_dp != InvalidDsaPointer)
        dsa_free(pgsa_dsa_area, old_dp);
 
    /* Bump change count. */
    pg_atomic_add_fetch_u64(&pgsa_state->change_count, 1);
}

References pgsa_entry::advice_string, Assert, pgsa_shared_state::change_count, dsa_free(), dshash_delete_entry(), dshash_find(), ereport, errcode(), errmsg, ERROR, fb(), InvalidDsaPointer, pgsa_shared_state::lock, LWLockHeldByMe(), pg_atomic_add_fetch_u64(), pgsa_dsa_area, pgsa_entry_dshash, pgsa_lookup_stash_id(), and pgsa_state.

Referenced by pg_set_stashed_advice().

◆ pgsa_create_stash()

void pgsa_create_stash ( char * stash_name )

extern

Definition at line 426 of file pg_stash_advice.c.

{
    pgsa_stash *stash;
    bool        found;
 
    Assert(LWLockHeldByMeInMode(&pgsa_state->lock, LW_EXCLUSIVE));
 
    /* Create a stash with this name, unless one already exists. */
    stash = dshash_find_or_insert(pgsa_stash_dshash, stash_name, &found);
    if (found)
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash \"%s\" already exists", stash_name));
    stash->pgsa_stash_id = pgsa_state->next_stash_id++;
    dshash_release_lock(pgsa_stash_dshash, stash);
 
    /* Bump change count. */
    pg_atomic_add_fetch_u64(&pgsa_state->change_count, 1);
}

References Assert, pgsa_shared_state::change_count, dshash_find_or_insert, dshash_release_lock(), ereport, errcode(), errmsg, ERROR, fb(), pgsa_shared_state::lock, LW_EXCLUSIVE, LWLockHeldByMeInMode(), pgsa_shared_state::next_stash_id, pg_atomic_add_fetch_u64(), pgsa_stash_dshash, and pgsa_state.

Referenced by pg_create_advice_stash(), and pgsa_restore_stashes().

◆ pgsa_drop_stash()

void pgsa_drop_stash ( char * stash_name )

extern

Definition at line 493 of file pg_stash_advice.c.

{
    pgsa_entry *entry;
    pgsa_stash *stash;
    dshash_seq_status iterator;
    uint64      stash_id;
 
    Assert(LWLockHeldByMeInMode(&pgsa_state->lock, LW_EXCLUSIVE));
 
    /* Remove the entry for this advice stash. */
    stash = dshash_find(pgsa_stash_dshash, stash_name, true);
    if (stash == NULL)
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash \"%s\" does not exist", stash_name));
    stash_id = stash->pgsa_stash_id;
    dshash_delete_entry(pgsa_stash_dshash, stash);
 
    /*
     * Now remove all the entries. Since pgsa_state->lock must be held at
     * least in shared mode to insert entries into pgsa_entry_dshash, it
     * doesn't matter whether we do this before or after deleting the entry
     * from pgsa_stash_dshash.
     */
    dshash_seq_init(&iterator, pgsa_entry_dshash, true);
    while ((entry = dshash_seq_next(&iterator)) != NULL)
    {
        if (stash_id == entry->key.pgsa_stash_id)
        {
            if (entry->advice_string != InvalidDsaPointer)
                dsa_free(pgsa_dsa_area, entry->advice_string);
            dshash_delete_current(&iterator);
        }
    }
    dshash_seq_term(&iterator);
 
    /* Bump change count. */
    pg_atomic_add_fetch_u64(&pgsa_state->change_count, 1);
}

References pgsa_entry::advice_string, Assert, pgsa_shared_state::change_count, dsa_free(), dshash_delete_current(), dshash_delete_entry(), dshash_find(), dshash_seq_init(), dshash_seq_next(), dshash_seq_term(), ereport, errcode(), errmsg, ERROR, fb(), InvalidDsaPointer, pgsa_entry::key, pgsa_shared_state::lock, LW_EXCLUSIVE, LWLockHeldByMeInMode(), pg_atomic_add_fetch_u64(), pgsa_dsa_area, pgsa_entry_dshash, pgsa_stash_dshash, pgsa_entry_key::pgsa_stash_id, and pgsa_state.

Referenced by pg_drop_advice_stash().

◆ pgsa_lookup_stash_id()

uint64 pgsa_lookup_stash_id ( char * stash_name )

extern

Definition at line 631 of file pg_stash_advice.c.

{
    pgsa_stash *stash;
    uint64      stash_id;
 
    /* Search the shared hash table. */
    stash = dshash_find(pgsa_stash_dshash, stash_name, false);
    if (stash == NULL)
        return 0;
    stash_id = stash->pgsa_stash_id;
    dshash_release_lock(pgsa_stash_dshash, stash);
 
    return stash_id;
}

References dshash_find(), dshash_release_lock(), fb(), and pgsa_stash_dshash.

Referenced by pg_get_advice_stash_contents(), pgsa_advisor(), pgsa_clear_advice_string(), and pgsa_set_advice_string().

◆ pgsa_reset_all_stashes()

void pgsa_reset_all_stashes ( void )

extern

Definition at line 540 of file pg_stash_advice.c.

{
    dshash_seq_status iter;
    pgsa_entry *entry;
 
    Assert(LWLockHeldByMeInMode(&pgsa_state->lock, LW_EXCLUSIVE));
 
    /* Remove all stashes. */
    dshash_seq_init(&iter, pgsa_stash_dshash, true);
    while (dshash_seq_next(&iter) != NULL)
        dshash_delete_current(&iter);
    dshash_seq_term(&iter);
 
    /* Remove all entries. */
    dshash_seq_init(&iter, pgsa_entry_dshash, true);
    while ((entry = dshash_seq_next(&iter)) != NULL)
    {
        if (entry->advice_string != InvalidDsaPointer)
            dsa_free(pgsa_dsa_area, entry->advice_string);
        dshash_delete_current(&iter);
    }
    dshash_seq_term(&iter);
 
    /* Reset the stash ID counter. */
    pgsa_state->next_stash_id = UINT64CONST(1);
}

References pgsa_entry::advice_string, Assert, dsa_free(), dshash_delete_current(), dshash_seq_init(), dshash_seq_next(), dshash_seq_term(), fb(), InvalidDsaPointer, pgsa_shared_state::lock, LW_EXCLUSIVE, LWLockHeldByMeInMode(), pgsa_shared_state::next_stash_id, pgsa_dsa_area, pgsa_entry_dshash, pgsa_stash_dshash, pgsa_state, and UINT64CONST.

Referenced by pgsa_read_from_disk().

◆ pgsa_set_advice_string()

void pgsa_set_advice_string	(	char *	stash_name,
		int64	queryId,
		char *	advice_string
	)

extern

Definition at line 650 of file pg_stash_advice.c.

{
    pgsa_entry *entry;
    bool        found;
    pgsa_entry_key key;
    uint64      stash_id;
    dsa_pointer new_dp;
    dsa_pointer old_dp;
 
    /*
     * The caller must hold our lock, at least in shared mode.  This is
     * important for two reasons.
     *
     * First, it holds off interrupts, so that we can't bail out of this code
     * after allocating DSA memory for the advice string and before storing
     * the resulting pointer somewhere that others can find it.
     *
     * Second, we need to avoid a race against pgsa_drop_stash(). That
     * function removes a stash_name->stash_id mapping and all the entries for
     * that stash_id. Without the lock, there's a race condition no matter
     * which of those things it does first, because as soon as we've looked up
     * the stash ID, that whole function can execute before we do the rest of
     * our work, which would result in us adding an entry for a stash that no
     * longer exists.
     */
    Assert(LWLockHeldByMe(&pgsa_state->lock));
 
    /* Look up the stash ID. */
    if ((stash_id = pgsa_lookup_stash_id(stash_name)) == 0)
        ereport(ERROR,
                errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                errmsg("advice stash \"%s\" does not exist", stash_name));
 
    /* Allocate space for the advice string. */
    new_dp = dsa_allocate(pgsa_dsa_area, strlen(advice_string) + 1);
    strcpy(dsa_get_address(pgsa_dsa_area, new_dp), advice_string);
 
    /* Attempt to insert an entry into the hash table. */
    memset(&key, 0, sizeof(pgsa_entry_key));
    key.pgsa_stash_id = stash_id;
    key.queryId = queryId;
    entry = dshash_find_or_insert_extended(pgsa_entry_dshash, &key, &found,
                                           DSHASH_INSERT_NO_OOM);
 
    /*
     * If it didn't work, bail out, being careful to free the shared memory
     * we've already allocated before, since error cleanup will not do so.
     */
    if (entry == NULL)
    {
        dsa_free(pgsa_dsa_area, new_dp);
        ereport(ERROR,
                errcode(ERRCODE_OUT_OF_MEMORY),
                errmsg("out of memory"),
                errdetail("could not insert advice string into shared hash table"));
    }
 
    /* Update the entry and release the lock. */
    old_dp = found ? entry->advice_string : InvalidDsaPointer;
    entry->advice_string = new_dp;
    dshash_release_lock(pgsa_entry_dshash, entry);
 
    /*
     * We're not safe from leaks yet!
     *
     * There's now a pointer to new_dp in the entry that we just updated, but
     * that means that there's no longer anything pointing to old_dp.
     */
    if (DsaPointerIsValid(old_dp))
        dsa_free(pgsa_dsa_area, old_dp);
 
    /* Bump change count. */
    pg_atomic_add_fetch_u64(&pgsa_state->change_count, 1);
}

References pgsa_entry::advice_string, Assert, pgsa_shared_state::change_count, dsa_allocate, dsa_free(), dsa_get_address(), DsaPointerIsValid, dshash_find_or_insert_extended(), DSHASH_INSERT_NO_OOM, dshash_release_lock(), ereport, errcode(), errdetail(), errmsg, ERROR, fb(), InvalidDsaPointer, pgsa_shared_state::lock, LWLockHeldByMe(), pg_atomic_add_fetch_u64(), pgsa_dsa_area, pgsa_entry_dshash, pgsa_lookup_stash_id(), and pgsa_state.

Referenced by pg_set_stashed_advice(), and pgsa_restore_entries().

◆ pgsa_start_worker()

void pgsa_start_worker ( void )

extern

Definition at line 729 of file pg_stash_advice.c.

{
    BackgroundWorker worker = {0};
    BackgroundWorkerHandle *handle;
    BgwHandleStatus status;
    pid_t       pid;
 
    worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
    worker.bgw_start_time = BgWorkerStart_ConsistentState;
    worker.bgw_restart_time = BGW_DEFAULT_RESTART_INTERVAL;
    strcpy(worker.bgw_library_name, "pg_stash_advice");
    strcpy(worker.bgw_function_name, "pg_stash_advice_worker_main");
    strcpy(worker.bgw_name, "pg_stash_advice worker");
    strcpy(worker.bgw_type, "pg_stash_advice worker");
 
    /*
     * If process_shared_preload_libraries_in_progress = true, we may be in
     * the postmaster, in which case this will really register the worker, or
     * we may be in a child process in an EXEC_BACKEND build, in which case it
     * will silently do nothing (which is the correct behavior).
     */
    if (process_shared_preload_libraries_in_progress)
    {
        RegisterBackgroundWorker(&worker);
        return;
    }
 
    /*
     * If process_shared_preload_libraries_in_progress = false, we're being
     * asked to start the worker after system startup time. In other words,
     * unless this is single-user mode, we're not in the postmaster, so we
     * should use RegisterDynamicBackgroundWorker and then wait for startup to
     * complete. (If we do happen to be in single-user mode, this will error
     * out, which is fine.)
     */
    worker.bgw_notify_pid = MyProcPid;
    if (!RegisterDynamicBackgroundWorker(&worker, &handle))
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
                 errmsg("could not register background process"),
                 errhint("You may need to increase \"max_worker_processes\".")));
    status = WaitForBackgroundWorkerStartup(handle, &pid);
    if (status != BGWH_STARTED)
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
                 errmsg("could not start background process"),
                 errhint("More details may be available in the server log.")));
}

Referenced by _PG_init(), and pg_start_stash_advice_worker().

Variable Documentation

◆ pg_stash_advice_persist

bool pg_stash_advice_persist

extern

Definition at line 51 of file pg_stash_advice.c.

Referenced by _PG_init(), and pgsa_init_shared_state().

◆ pg_stash_advice_persist_interval

int pg_stash_advice_persist_interval

extern

Definition at line 52 of file pg_stash_advice.c.

Referenced by _PG_init(), and pg_stash_advice_worker_main().

◆ pgsa_dsa_area

dsa_area* pgsa_dsa_area

extern

Definition at line 56 of file pg_stash_advice.c.

Referenced by pg_get_advice_stash_contents(), pgsa_advisor(), pgsa_attach(), pgsa_clear_advice_string(), pgsa_drop_stash(), pgsa_reset_all_stashes(), pgsa_set_advice_string(), and pgsa_write_entries().

◆ pgsa_entry_dshash

dshash_table* pgsa_entry_dshash

extern

Definition at line 58 of file pg_stash_advice.c.

Referenced by pg_create_advice_stash(), pg_drop_advice_stash(), pg_get_advice_stash_contents(), pg_get_advice_stashes(), pg_set_stashed_advice(), pg_start_stash_advice_worker(), pgsa_advisor(), pgsa_attach(), pgsa_clear_advice_string(), pgsa_drop_stash(), pgsa_read_from_disk(), pgsa_reset_all_stashes(), pgsa_set_advice_string(), pgsa_write_entries(), and pgsa_write_to_disk().

◆ pgsa_stash_dshash

dshash_table* pgsa_stash_dshash

extern

Definition at line 57 of file pg_stash_advice.c.

Referenced by pg_get_advice_stash_contents(), pg_get_advice_stashes(), pgsa_attach(), pgsa_create_stash(), pgsa_drop_stash(), pgsa_lookup_stash_id(), pgsa_reset_all_stashes(), and pgsa_write_stashes().

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ PGSA_DUMP_FILE

◆ SH_DECLARE

◆ SH_ELEMENT_TYPE

◆ SH_KEY_TYPE

◆ SH_PREFIX

◆ SH_SCOPE

Typedef Documentation

◆ pgsa_entry

◆ pgsa_entry_key

◆ pgsa_shared_state

◆ pgsa_stash

◆ pgsa_stash_name

Function Documentation

◆ pgsa_attach()

◆ pgsa_check_lockout()

◆ pgsa_check_stash_name()

◆ pgsa_clear_advice_string()

◆ pgsa_create_stash()

◆ pgsa_drop_stash()

◆ pgsa_lookup_stash_id()

◆ pgsa_reset_all_stashes()

◆ pgsa_set_advice_string()

◆ pgsa_start_worker()

Variable Documentation

◆ pg_stash_advice_persist

◆ pg_stash_advice_persist_interval

◆ pgsa_dsa_area

◆ pgsa_entry_dshash

◆ pgsa_stash_dshash

◆ pgsa_state