pbank.c File Reference

#include <string.h>
#include <hipc/atomic.h>
#include <hipc/pbank.h>

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Functions
void	hipcPbankInit (struct HIPC_pbank *const bank_p, void *const buf_p, const size_t page_size)
	Initializes a parameter bank. More...
size_t	hipcPbankGetPageSize (struct HIPC_pbank *const bank_p)
	Gets page size. More...
const void *	hipcPbankGetReadOnlyPage (struct HIPC_pbank *const bank_p)
	Gets a current read only page. More...
void *	hipcPbankGetWritablePage (struct HIPC_pbank *const bank_p)
	Gets a current writable page. More...
enum HIPC_pbank_stat	hipcPbankGetStat (struct HIPC_pbank *const bank_p)
	Gets current status of a bank. More...
enum HIPC_errno	hipcPbankSwitchRequest (struct HIPC_pbank *const bank_p)
	Requests to switch pages. More...
int	hipcPbankSwitchAccept (struct HIPC_pbank *const bank_p)
	Accepts a switching request and switches pages if switching is requested. More...
enum HIPC_errno	hipcPbankSwitchComplete (struct HIPC_pbank *const bank_p)
	Makes both pages have the same latest contents and completes the switching. More...
enum HIPC_errno	hipcPbankSwitchReqWaitCmpl (struct HIPC_pbank *const bank_p)
	Calls hipcPbankSwitchRequest(), waits for acceptance of the request, and calls hipcPbankSwitchComplete(). More...

Function Documentation

void hipcPbankInit	(	struct HIPC_pbank *const	bank_p,
		void *const	buf_p,
		const size_t	page_size
	)

Initializes a parameter bank.

This function copies contents in the first half of buffer to the second half.

Parameters

bank_p	pointer to a parameter bank
buf_p	a buffer whose size must be page_size multiplied by 2
page_size	size of a page

Definition at line 14 of file pbank.c.

References HIPC_MEM_BARRIER, HIPC_PBANK_STAT_GROUND, HIPC_pbank::page_ro_p, HIPC_pbank::page_rw_p, HIPC_pbank::page_size, and HIPC_pbank::stat.

size_t hipcPbankGetPageSize

(

struct HIPC_pbank *const

bank_p

)

Gets page size.

Parameters

bank_p

pointer to a parameter bank

Returns

page size

Definition at line 33 of file pbank.c.

References HIPC_pbank::page_size.

const void* hipcPbankGetReadOnlyPage

(

struct HIPC_pbank *const

bank_p

)

Gets a current read only page.

Parameters

bank_p

pointer to a parameter bank

Returns

current read only page

Definition at line 44 of file pbank.c.

References HIPC_pbank::page_ro_p.

void* hipcPbankGetWritablePage

(

struct HIPC_pbank *const

bank_p

)

Gets a current writable page.

Parameters

bank_p

pointer to a parameter bank

Returns

current writable page

Definition at line 55 of file pbank.c.

References HIPC_pbank::page_rw_p.

enum HIPC_pbank_stat hipcPbankGetStat

(

struct HIPC_pbank *const

bank_p

)

Gets current status of a bank.

Parameters

bank_p

pointer to a parameter bank

Returns

current status

Definition at line 66 of file pbank.c.

References HIPC_pbank::stat.

Referenced by hipcPbankSwitchReqWaitCmpl().

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enum HIPC_errno hipcPbankSwitchRequest

(

struct HIPC_pbank *const

bank_p

)

Requests to switch pages.

Parameters

bank_p

pointer to a parameter bank

Returns

HIPC_SUCCESS on success, or an error on failure.

Definition at line 77 of file pbank.c.

References HIPC_ERR_S_PBANK_STAT_MISMATCH, HIPC_MEM_BARRIER, HIPC_PBANK_STAT_GROUND, HIPC_PBANK_STAT_REQUESTED, HIPC_SUCCESS, and HIPC_pbank::stat.

Referenced by hipcPbankSwitchReqWaitCmpl().

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int hipcPbankSwitchAccept

(

struct HIPC_pbank *const

bank_p

)

Accepts a switching request and switches pages if switching is requested.

Parameters

bank_p

pointer to a parameter bank

Return values

0	Switching is not requested.
1	Pages have been switched.

Definition at line 96 of file pbank.c.

References HIPC_MEM_BARRIER, HIPC_PBANK_STAT_ACCEPTED, HIPC_PBANK_STAT_REQUESTED, HIPC_pbank::page_ro_p, HIPC_pbank::page_rw_p, and HIPC_pbank::stat.

enum HIPC_errno hipcPbankSwitchComplete

(

struct HIPC_pbank *const

bank_p

)

Makes both pages have the same latest contents and completes the switching.

Parameters

bank_p

pointer to a parameter bank

Returns

HIPC_SUCCESS on success, or an error on failure.

Definition at line 121 of file pbank.c.

References HIPC_ERR_S_PBANK_STAT_MISMATCH, HIPC_MEM_BARRIER, HIPC_PBANK_STAT_ACCEPTED, HIPC_PBANK_STAT_GROUND, HIPC_SUCCESS, HIPC_pbank::page_ro_p, HIPC_pbank::page_rw_p, HIPC_pbank::page_size, and HIPC_pbank::stat.

Referenced by hipcPbankSwitchReqWaitCmpl().

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enum HIPC_errno hipcPbankSwitchReqWaitCmpl

(

struct HIPC_pbank *const

bank_p

)

Calls hipcPbankSwitchRequest(), waits for acceptance of the request, and calls hipcPbankSwitchComplete().

Parameters

bank_p

pointer to a parameter bank

Returns

HIPC_SUCCESS on success, or an error on failure.

Definition at line 141 of file pbank.c.

References HIPC_PBANK_STAT_REQUESTED, HIPC_SUCCESS, hipcPbankGetStat(), hipcPbankSwitchComplete(), and hipcPbankSwitchRequest().

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