arch/util/machine-pxshm.C File Reference

pxshm --> posix shared memory based network layer for communication between processes on the same node This is not going to be the primary mode of communication but only for messages below a certain size between processes on the same node for non-smp version only * contains only pxshm code for

• CmiInitPxshm()
• DeliverViaPxShm()
• CommunicationServerPxshm()
• CmiMachineExitPxshm()

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Data Structures
struct	sharedBufHeader
	This struct is used as the first portion of a shared memory region, followed by data. More...
struct	sharedBufData
struct	OutgoingMsgRec
struct	PxshmSendQ
struct	PxshmContext
Enumerations
enum	entities { SENDER, RECEIVER, SENDER, RECEIVER }
Functions
void	calculateNodeSizeAndRank (char **)
void	setupSharedBuffers (void)
void	initAllSendQs (void)
void	CmiExitPxshm (void)
static void	cleanupOnAllSigs (int signo)
void	CmiInitPxshm (char **argv)
void	tearDownSharedBuffers (void)
void	freeSharedBuffers (void)
static int	CmiValidPxshm (int node, int size)
int	PxshmRank (int dstnode)
void	pushSendQ (PxshmSendQ *q, char *msg, int size, int *refcount)
int	sendMessage (char *msg, int size, int *refcount, sharedBufData *dstBuf, PxshmSendQ *dstSendQ)
int	flushSendQ (PxshmSendQ *q)
int	sendMessageRec (OutgoingMsgRec *omg, sharedBufData *dstBuf, PxshmSendQ *dstSendQ)
void	CmiSendMessagePxshm (char *msg, int size, int dstnode, int *refcount)
Variables
static int	SHMBUFLEN = (1024 * 1024 * 4)
static int	SHMMAXSIZE = (1024 * 1024)
static int	SENDQSTARTSIZE = 256
static int	sendQ_head_index = -1
PxshmContext *	pxshmContext = NULL
static int	pxshm_freed = 0

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Detailed Description

pxshm --> posix shared memory based network layer for communication between processes on the same node This is not going to be the primary mode of communication but only for messages below a certain size between processes on the same node for non-smp version only * contains only pxshm code for

• CmiInitPxshm()
• DeliverViaPxShm()
• CommunicationServerPxshm()
• CmiMachineExitPxshm()

There are three options here for synchronization: PXSHM_FENCE is the default. It uses memory fences PXSHM_OSSPINLOCK will cause OSSpinLock's to be used (available on OSX) PXSHM_LOCK will cause POSIX semaphores to be used

created by Sayantan Chakravorty, sayantan@gmail.com ,21st March 2007

Definition in file machine-pxshm.C.