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📁 ..
📄 backendid.h(1.1 KB)
📄 barrier.h(674 B)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(12.24 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(9 KB)
📄 bufpage.h(14.91 KB)
📄 checksum.h(666 B)
📄 checksum_impl.h(8.59 KB)
📄 copydir.h(561 B)
📄 dsm.h(1.95 KB)
📄 dsm_impl.h(2.12 KB)
📄 fd.h(4.27 KB)
📄 freespace.h(1.36 KB)
📄 fsm_internals.h(2.26 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.67 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.93 KB)
📄 large_object.h(3.6 KB)
📄 latch.h(6.55 KB)
📄 lmgr.h(4.19 KB)
📄 lock.h(22.89 KB)
📄 lockdefs.h(1.86 KB)
📄 lwlock.h(9.19 KB)
📄 lwlocknames.h(2.42 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.39 KB)
📄 pg_shmem.h(2.23 KB)
📄 pmsignal.h(2.1 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.96 KB)
📄 proc.h(10.81 KB)
📄 procarray.h(3.5 KB)
📄 procsignal.h(1.9 KB)
📄 reinit.h(592 B)
📄 relfilenode.h(3.81 KB)
📄 s_lock.h(28.64 KB)
📄 shm_mq.h(2.59 KB)
📄 shm_toc.h(2.01 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(5.41 KB)
📄 sinvaladt.h(1.58 KB)
📄 smgr.h(5.96 KB)
📄 spin.h(2.42 KB)
📄 standby.h(3.35 KB)
📄 standbydefs.h(2.25 KB)

Editing: dsm_impl.h

/*-------------------------------------------------------------------------
 *
 * dsm_impl.h
 *	  low-level dynamic shared memory primitives
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/dsm_impl.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef DSM_IMPL_H
#define DSM_IMPL_H

/* Dynamic shared memory implementations. */
#define DSM_IMPL_NONE			0
#define DSM_IMPL_POSIX			1
#define DSM_IMPL_SYSV			2
#define DSM_IMPL_WINDOWS		3
#define DSM_IMPL_MMAP			4

/*
 * Determine which dynamic shared memory implementations will be supported
 * on this platform, and which one will be the default.
 */
#ifdef WIN32
#define USE_DSM_WINDOWS
#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE		DSM_IMPL_WINDOWS
#else
#ifdef HAVE_SHM_OPEN
#define USE_DSM_POSIX
#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE		DSM_IMPL_POSIX
#endif
#define USE_DSM_SYSV
#ifndef DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE
#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE		DSM_IMPL_SYSV
#endif
#define USE_DSM_MMAP
#endif

/* GUC. */
extern int	dynamic_shared_memory_type;

/*
 * Directory for on-disk state.
 *
 * This is used by all implementations for crash recovery and by the mmap
 * implementation for storage.
 */
#define PG_DYNSHMEM_DIR					"pg_dynshmem"
#define PG_DYNSHMEM_MMAP_FILE_PREFIX	"mmap."

/* A "name" for a dynamic shared memory segment. */
typedef uint32 dsm_handle;

/* All the shared-memory operations we know about. */
typedef enum
{
	DSM_OP_CREATE,
	DSM_OP_ATTACH,
	DSM_OP_DETACH,
	DSM_OP_RESIZE,
	DSM_OP_DESTROY
} dsm_op;

/* Create, attach to, detach from, resize, or destroy a segment. */
extern bool dsm_impl_op(dsm_op op, dsm_handle handle, Size request_size,
			void **impl_private, void **mapped_address, Size *mapped_size,
			int elevel);

/* Some implementations cannot resize segments.  Can this one? */
extern bool dsm_impl_can_resize(void);

/* Implementation-dependent actions required to keep segment until shutdown. */
extern void dsm_impl_pin_segment(dsm_handle handle, void *impl_private);

#endif   /* DSM_IMPL_H */

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Editing: dsm_impl.h

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