CDA SC510 Guia do Utilizador descarregar pdf (Página 9)

D2.1.4 IST-033576

2.4 Checkpoint/restart API

The API described in D2.1.3 will become available with the next release. There-

fore, checkpoint/restart API available is the BLCR API. The main functions of

this API are described below, see header ﬁle libcr.h for a complete description of

this API.

However, BLCR functionalities have already been enhanced with the possibil-

ity to save libraries and executable during the checkpoint. Therefore, a previously

checkpointed program can restart even if the executable and the librairies are not

available. The use of this functionality is described in 2.4.2.

2.4.1 Initialization

To begin, each thread that will make any call to the libcr must ﬁrst call the follow-

ing function. The only exception is for the callback threads, which run in a thread

created by libcr, and don’t need to do this call.

e x t e r n c r _ c l i e n t _ i d _ t c r _ i n i t ( v oid ) ;

This function returns a positive thread-scope identiﬁer on success, and a neg-

ative value if failure.

2.4.2 Checkpoint parameters

Checkpoints can be parameterised using the following structure:

t y p e d e f s t r u c t c r _ c h e c k p o i n t _ a r g s {

c r _ v e r s i o n _ t c r _ v e r s i o n ;

c r _ s c o p e _ t c r _ s c o p e ;

p i d _ t c r _ t a r g e t ;

i n t c r _ f d ;

i n t c r _ s i g n a l ;

un sig ne d i n t c r _ t i m e o u t ;

un sig ne d i n t vmadump_flags ;

un sig ne d i n t c r _ f l a g s ;

} c r _ c h e c k p o i n t _ a r g s _ t ;

Before being ﬁlled by user values, this structure must be initialized via a call

to the following function :

vo i d c r i _ i n i t i a l i z e _ c h e c k p o i n t _ a r g s _ t (

c r _ c h e c k p o i n t _ a r g s _ t ∗ v a l u e ) ;

7/49 XtreemOS–Integrated Project

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 50 51

Sem comentários

CDA SC510 Guia do Utilizador Página 9