ShmemCtl Struct Reference

#include <veil_datatypes.h>

Collaboration diagram for ShmemCtl:

---

Detailed Description

The ShmemCtl structure is the first object allocated from the first chunk of shared memory in context 0.

This object describes and manages shared memory allocated by shmalloc()

Definition at line 152 of file veil_datatypes.h.

Data Fields
ObjType	type
	This must have the value OBJ_SHMEMCTL.
bool	initialised
	Set to true once struct is setup.
LWLockId	veil_lwlock
int	current_context
	dynamically allocated LWLock
size_t	total_allocated [2]
	Total shared memory allocated in chunks in each context.
bool	switching
	Whether a context-switch is in progress.
MemChunk *	context [2]
	The first chunks of each context.
TransactionId	xid [2]
	The transaction id of the transaction that initialised each context: this is used to determine whether there are transactions still runnning that may be using an earlier context.
MemChunk *	context [2]
	The first chunks of each context.

---

Field Documentation

int ShmemCtl::current_context

dynamically allocated LWLock

Index of the current context (0 or 1)

Definition at line 156 of file veil_datatypes.h.

TransactionId ShmemCtl::xid

The transaction id of the transaction that initialised each context: this is used to determine whether there are transactions still runnning that may be using an earlier context.

Definition at line 163 of file veil_datatypes.h.

---

The documentation for this struct was generated from the following files:

• src/veil_datatypes.h
• src/veil_shmem.h

---