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Current File : //usr/include/pgsql/server/executor/spi_priv.h

/*-------------------------------------------------------------------------
 *
 * spi_priv.h
 *				Server Programming Interface private declarations
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/executor/spi_priv.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SPI_PRIV_H
#define SPI_PRIV_H

#include "executor/spi.h"


#define _SPI_PLAN_MAGIC		569278163

typedef struct
{
	/* current results */
	uint32		processed;		/* by Executor */
	Oid			lastoid;
	SPITupleTable *tuptable;

	MemoryContext procCxt;		/* procedure context */
	MemoryContext execCxt;		/* executor context */
	MemoryContext savedcxt;		/* context of SPI_connect's caller */
	SubTransactionId connectSubid;		/* ID of connecting subtransaction */
} _SPI_connection;

/*
 * SPI plans have three states: saved, unsaved, or temporary.
 *
 * Ordinarily, the _SPI_plan struct itself as well as the argtypes array
 * are in a dedicated memory context identified by plancxt (which can be
 * really small).  All the other subsidiary state is in plancache entries
 * identified by plancache_list (note: the list cells themselves are in
 * plancxt).
 *
 * In an unsaved plan, the plancxt as well as the plancache entries' contexts
 * are children of the SPI procedure context, so they'll all disappear at
 * function exit.  plancache.c also knows that the plancache entries are
 * "unsaved", so it doesn't link them into its global list; hence they do
 * not respond to inval events.  This is OK since we are presumably holding
 * adequate locks to prevent other backends from messing with the tables.
 *
 * For a saved plan, the plancxt is made a child of CacheMemoryContext
 * since it should persist until explicitly destroyed.  Likewise, the
 * plancache entries will be under CacheMemoryContext since we tell
 * plancache.c to save them.  We rely on plancache.c to keep the cache
 * entries up-to-date as needed in the face of invalidation events.
 *
 * There are also "temporary" SPI plans, in which the _SPI_plan struct is
 * not even palloc'd but just exists in some function's local variable.
 * The plancache entries are unsaved and exist under the SPI executor context,
 * while additional data such as argtypes and list cells is loose in the SPI
 * executor context.  Such plans can be identified by having plancxt == NULL.
 *
 * We can also have "one-shot" SPI plans (which are typically temporary,
 * as described above).  These are meant to be executed once and discarded,
 * and various optimizations are made on the assumption of single use.
 * Note in particular that the CachedPlanSources within such an SPI plan
 * are not "complete" until execution.
 *
 * Note: if the original query string contained only whitespace and comments,
 * the plancache_list will be NIL and so there is no place to store the
 * query string.  We don't care about that, but we do care about the
 * argument type array, which is why it's seemingly-redundantly stored.
 */
typedef struct _SPI_plan
{
	int			magic;			/* should equal _SPI_PLAN_MAGIC */
	bool		saved;			/* saved or unsaved plan? */
	bool		oneshot;		/* one-shot plan? */
	List	   *plancache_list; /* one CachedPlanSource per parsetree */
	MemoryContext plancxt;		/* Context containing _SPI_plan and data */
	int			cursor_options; /* Cursor options used for planning */
	int			nargs;			/* number of plan arguments */
	Oid		   *argtypes;		/* Argument types (NULL if nargs is 0) */
	ParserSetupHook parserSetup;	/* alternative parameter spec method */
	void	   *parserSetupArg;
} _SPI_plan;

#endif   /* SPI_PRIV_H */

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Case Studies

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We have started to work with CBS News, bringing our ideas of character-driven storytelling to one of the most successful and biggest networks in the United States. Since beginning to work with them ratings have climbed and more importantly, audience engagement is through the ceiling.

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We started New York Times Television in 1990 and it was the first paper to be brought into the world of TV. It quickly became one of the most successful non-fiction production companies in the United States. The series and documentaries we produced won many awards including multiple Emmys.

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The United Nations

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The Newark Star-Ledger

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Voice of America

In 1990, we were approached by The Voice of America, the official broadcasting agency for the United States Government. When we met with VOA, they were only a short wave radio broadcaster, but working with them, we took them into television, launching VOA-TV.

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British based Oyster Yachts makes some of the finest yachts in the world. Like every other company, they had to find a way to feed the never-ending video demands of social media – sites like Instagram and TikTok. We trained the Oyster staff to tell their own stories, using only iPhones.

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Michael on Media

Michael Rosenblum has been writing about the media since 1988. His work and ideas have appeared in The Guardian, The Huffington Post, Ilkeston Life and many other publications.

He has been blogging regularly for the past 35 years on this subject. Having taught media studies at Columbia University, NYU and now the University of Oxford, he is considered an expert on this subject.

Continue reading this post or look back at previous posts.

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