c53dc217bb
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@392 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
502 lines
12 KiB
C
502 lines
12 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright S. Konstantopoulos and Universidade do Porto 2002 *
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* *
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**************************************************************************
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* *
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* File: mpi.c *
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* Last rev: $Date: 2002-02-27 13:41:24 $ *
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* mods: *
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* comments: Interface to an MPI library *
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* *
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*************************************************************************/
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#ifndef lint
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static char *rcsid = "$Header: /Users/vitor/Yap/yap-cvsbackup/library/mpi/mpi.c,v 1.5 2002-02-27 13:41:24 stasinos Exp $";
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#endif
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#include "Yap.h"
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#if HAVE_MPI
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#include "Yatom.h"
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#include "yapio.h"
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/* for AtomEof */
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#include "Heap.h"
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#include <stdlib.h>
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#include <string.h>
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#include <mpi.h>
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STATIC_PROTO (Int p_mpi_open, (void));
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STATIC_PROTO (Int p_mpi_close, (void));
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STATIC_PROTO (Int p_mpi_send, (void));
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STATIC_PROTO (Int p_mpi_receive, (void));
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STATIC_PROTO (Int p_mpi_bcast, (void));
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STATIC_PROTO (Int p_mpi_barrier, (void));
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/*
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* Auxiliary Data and Functions
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*/
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static Int rank, numprocs, namelen;
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static char processor_name[MPI_MAX_PROCESSOR_NAME];
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static Int mpi_argc;
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static char **mpi_argv;
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/* mini-stream */
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#define RECV_BUF_SIZE 4*1024
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static size_t bufsize;
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static char *buf;
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static int bufptr, bufstrlen;
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static void
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expand_buffer( int space )
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{
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#if 1
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/* realloc has been SIGSEGV'ing on HP-UX 10.20.
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do i need to look into arcane allignment issues? */
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char *tmp;
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tmp = malloc( bufsize + space );
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if( tmp == NULL ) {
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Error(SYSTEM_ERROR, TermNil, "out of memory" );
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exit_yap( EXIT_FAILURE );
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}
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memcpy( tmp, buf, bufsize );
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free( buf );
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buf = tmp;
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#else
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buf = realloc( buf, bufsize + space );
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if( buf == NULL ) {
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Error(SYSTEM_ERROR, TermNil, "out of memory" );
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exit_yap( EXIT_FAILURE );
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}
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#endif
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bufsize += space;
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#if 0
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printf( "New bufsize: %d\n", bufsize );
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#endif
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}
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static int
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mpi_putc(Int stream, Int ch)
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{
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if( ch > 0 ) {
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if( bufptr >= bufsize ) expand_buffer( RECV_BUF_SIZE );
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buf[bufptr++] = ch;
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}
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return ch;
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}
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static Int
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mpi_getc(Int stream)
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{
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return buf[bufptr++];
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}
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static Int
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mpi_eob(void)
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{
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return (bufptr<bufstrlen) && (buf[bufptr] != EOF);
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}
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/* Term parser */
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static Term
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mpi_parse(void)
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{
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Term v, t;
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TokEntry *tokstart;
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tr_fr_ptr old_TR;
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old_TR = TR;
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while( TRUE ) {
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CELL *old_H = H;
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/* Scans the term using stack space */
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eot_before_eof = FALSE;
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/* the first arg is the getc_for_read, diff only if CharConv is on */
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tokstart = tokptr = toktide = tokenizer( mpi_getc, mpi_getc );
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if ( mpi_eob() && !eot_before_eof) {
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if (tokstart != NIL && tokstart->Tok != Ord (eot_tok)) {
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/* we got the end of file from an abort */
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if (ErrorMessage == "Abort") {
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TR = old_TR;
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return(NULL);
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}
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/* we need to force the next reading to also give end of file.*/
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buf[bufptr] = EOF;
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ErrorMessage = "[ Error: end of file found before end of term ]";
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} else {
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/* restore TR */
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TR = old_TR;
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if( unify_constant (ARG2, MkAtomTerm (AtomEof)) ) {
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/* this might be a reasonable place to reach, but i don't know when */
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puts("1XXXXXXXXXXXXXXXXXX");
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return(NULL);
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}
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else {
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puts("2XXXXXXXXXXXXXXXXXX");
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return NULL;
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}
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}
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}
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repeat_cycle:
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if (ErrorMessage || (t = Parse ()) == 0) {
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if (ErrorMessage && (strcmp(ErrorMessage,"Stack Overflow") == 0)) {
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/* ignore term we just built */
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H = old_H;
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if (growstack_in_parser(&old_TR, &tokstart, &VarTable)) {
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tokptr = toktide = tokstart;
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ErrorMessage = NULL;
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goto repeat_cycle;
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}
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}
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TR = old_TR;
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if (ErrorMessage)
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YP_fprintf (YP_stderr, "%s", ErrorMessage);
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else
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syntax_error (tokstart);
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YP_fprintf (YP_stderr, " ]\n");
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Error(SYSTEM_ERROR,TermNil,NULL);
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return(NULL);
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} else {
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/* parsing succeeded */
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break;
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}
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}
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while (TRUE) {
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CELL *old_H = H;
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if (setjmp(IOBotch) == 0) {
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v = VarNames(VarTable, TermNil);
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TR = old_TR;
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break;
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} else {
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/* don't need to recheck tokens */
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tokstart = NULL;
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/* restart global */
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H = old_H;
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growstack_in_parser(&old_TR, &tokstart, &VarTable);
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old_H = H;
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}
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}
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return t;
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}
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/*
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* C Predicates
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*/
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static Int
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p_mpi_open(void) /* mpi_open(?rank, ?num_procs, ?proc_name) */
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{
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Term t_rank = Deref(ARG1), t_numprocs = Deref(ARG2), t_procname = Deref(ARG3);
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Int retv;
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MPI_Init( &mpi_argc, &mpi_argv );
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MPI_Comm_size( MPI_COMM_WORLD, &numprocs );
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MPI_Comm_rank( MPI_COMM_WORLD, &rank );
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MPI_Get_processor_name( processor_name, &namelen );
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retv = unify(t_rank, MkIntTerm(rank));
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retv = retv && unify(t_numprocs, MkIntTerm(numprocs));
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retv = retv && unify(t_procname, MkAtomTerm(LookupAtom(processor_name)));
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return retv;
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}
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static Int /* mpi_close */
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p_mpi_close()
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{
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MPI_Finalize();
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return TRUE;
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}
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static Int
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p_mpi_send() /* mpi_send(+data, +destination, +tag) */
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{
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Term t_data = Deref(ARG1), t_dest = Deref(ARG2), t_tag = Deref(ARG3);
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char *data;
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int tag, dest, retv;
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/* The first argument (data) must be bound */
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if (IsVarTerm(t_data)) {
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Error(INSTANTIATION_ERROR, t_data, "mpi_send");
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return (FALSE);
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}
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/* The second and third args must be bount to integers */
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if (IsVarTerm(t_dest)) {
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Error(INSTANTIATION_ERROR, t_dest, "mpi_send");
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return (FALSE);
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} else if( !IsIntegerTerm(t_dest) ) {
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Error(TYPE_ERROR_INTEGER, t_dest, "mpi_send");
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return (FALSE);
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} else {
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dest = IntOfTerm( t_dest );
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}
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if (IsVarTerm(t_tag)) {
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Error(INSTANTIATION_ERROR, t_tag, "mpi_send");
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return (FALSE);
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} else if( !IsIntegerTerm(t_tag) ) {
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Error(TYPE_ERROR_INTEGER, t_tag, "mpi_send");
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return (FALSE);
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} else {
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tag = IntOfTerm( t_tag );
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}
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bufptr = 0;
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/* Turn the term into its ASCII representation */
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plwrite( t_data, mpi_putc, 5 );
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bufstrlen = bufptr;
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bufptr = 0;
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while( bufstrlen-bufptr > 0 ) {
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int n;
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n = (bufstrlen-bufptr < RECV_BUF_SIZE)? (bufstrlen-bufptr) : RECV_BUF_SIZE;
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/* Careful: the buf is not NULL-terminated and does not have the
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trailing ". " required by the parser */
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retv = MPI_Send( &buf[bufptr], n, MPI_CHAR, dest, tag, MPI_COMM_WORLD );
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if( retv != 0 ) return FALSE;
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bufptr += n;
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}
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return TRUE;
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}
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static Int
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p_mpi_receive() /* mpi_receive(-data, ?orig, ?tag) */
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{
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Term t_data = Deref(ARG1), t_orig = Deref(ARG2), t_tag = Deref(ARG3);
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int tag, orig, retv;
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MPI_Status status;
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/* The first argument (data) must be unbound */
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if(!IsVarTerm(t_data)) {
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Error(INSTANTIATION_ERROR, t_data, "mpi_receive");
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return FALSE;
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}
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/* The second argument (source) must be bound to an integer
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(the rank of the source) or left unbound (i.e. any source
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is OK) */
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if (IsVarTerm(t_orig)) {
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orig = MPI_ANY_SOURCE;
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} else if( !IsIntegerTerm(t_orig) ) {
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Error(TYPE_ERROR_INTEGER, t_orig, "mpi_receive");
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return (FALSE);
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} else {
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orig = IntOfTerm( t_orig );
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}
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/* The third argument must be bound to an integer (the tag)
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or left unbound (i.e. any tag is OK) */
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if (IsVarTerm(t_tag)) {
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tag = MPI_ANY_TAG;
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} else if( !IsIntegerTerm(t_tag) ) {
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Error(TYPE_ERROR_INTEGER, t_tag, "mpi_receive");
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return (FALSE);
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} else
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tag = IntOfTerm( t_tag );
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bufptr = 0;
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while(TRUE) {
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int n;
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/* Receive the message as a C string */
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retv = MPI_Recv( &buf[bufptr], RECV_BUF_SIZE, MPI_CHAR, orig, tag,
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MPI_COMM_WORLD, &status );
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if( retv != 0 ) return FALSE;
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MPI_Get_count( &status, MPI_CHAR, &n );
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bufptr += n;
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if( n == RECV_BUF_SIZE ) {
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/* if not enough space, expand buffer */
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if( bufsize - bufptr <= RECV_BUF_SIZE ) expand_buffer(RECV_BUF_SIZE);
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}
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else {
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/* we have gotten everything */
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break;
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}
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}
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if( bufsize - bufptr <= 3 ) expand_buffer(3);
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/* NULL-terminate the string and add the ". " termination
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required by the parser. */
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buf[bufptr] = 0;
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strcat( buf, ". " );
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bufstrlen = bufptr + 2;
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bufptr = 0;
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if( orig == MPI_ANY_SOURCE ) unify(t_orig, MkIntTerm(status.MPI_SOURCE));
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if( tag == MPI_ANY_TAG ) unify(t_tag, MkIntTerm(status.MPI_TAG));
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/* parse received string into a Prolog term */
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return unify(ARG1, mpi_parse());
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}
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static Int
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p_mpi_bcast() /* mpi_bcast( ?data, +root, +max_size ) */
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{
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Term t_data = Deref(ARG1), t_root = Deref(ARG2), t_max_size = Deref(ARG3);
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int root, retv, max_size;
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/* The second argument must be bound to an integer (the rank of
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root processor */
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if (IsVarTerm(t_root)) {
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Error(INSTANTIATION_ERROR, t_root, "mpi_bcast");
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return FALSE;
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}
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root = IntOfTerm( t_root );
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/* If this is the root processor, then the first argument must
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be bound to the term to be sent. */
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if( root == rank ) {
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if( IsVarTerm(t_data) ) {
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Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
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return FALSE;
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}
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bufptr = 0;
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/* Turn the term into its ASCII representation */
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plwrite( t_data, mpi_putc, 5 );
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/* NULL-terminate the string and add the ". " termination
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required by the parser. */
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buf[bufptr] = 0;
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strcat( buf, ". " );
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}
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bufstrlen = bufptr + 2;
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/* The third argument must be bound to an integer (the maximum length
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of the broadcast term's ASCII representation */
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if (IsVarTerm(t_max_size)) {
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Error(INSTANTIATION_ERROR, t_max_size, "mpi_bcast");
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return FALSE;
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}
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/* allow for the ". " bit and the NULL at the end */
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max_size = IntOfTerm( t_max_size ) + 3;
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#if 0
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if( max_size < bufstrlen )
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/* issue a warning? explode? bcast s'thing unparsable? */
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#endif
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/* adjust the buffer size, if necessary */
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if( max_size > bufsize ) {
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printf("expanding by %d\n", max_size-bufsize);
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expand_buffer( max_size - bufsize );
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}
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retv = MPI_Bcast( buf, max_size, MPI_CHAR, root, MPI_COMM_WORLD );
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if( retv != 0 ) return FALSE;
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if( root == rank ) return TRUE;
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else {
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/* ARG1 must be unbound so that it can receive data */
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if( !IsVarTerm(t_data) ) {
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Error(INSTANTIATION_ERROR, t_root, "mpi_bcast");
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return FALSE;
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}
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bufstrlen = strlen(buf);
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bufptr = 0;
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/* parse received string into a Prolog term */
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return unify(mpi_parse(), ARG1);
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}
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}
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static Int
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p_mpi_barrier() /* mpi_barrier/0 */
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{
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int retv;
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retv = MPI_Barrier( MPI_COMM_WORLD );
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return (retv == 0);
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}
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/*
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* Init
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*/
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void
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InitMPI(void)
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{
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int i,j;
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mpi_argv = malloc( yap_argc * sizeof(char *) );
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mpi_argv[0] = strdup( yap_args[0] );
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bufsize = RECV_BUF_SIZE;
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buf = malloc(bufsize * sizeof(char));
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for( i=1; i<yap_argc; ++i ) {
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if( !strcmp(yap_args[i], "--") ) { ++i; break; }
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}
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for( j=1; i<yap_argc; ++i, ++j ) {
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mpi_argv[j] = strdup( yap_args[i] );
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}
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mpi_argc = j;
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mpi_argv[0] = strdup( yap_args[0] );
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#if 0
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/* DEBUG */
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printf( "yap_argc = %d\n", yap_argc );
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for( i=0; i<yap_argc; ++i ) {
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printf( "%d %s\n", i, yap_args[i] );
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}
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#endif
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#if 0
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/* DEBUG */
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printf( "mpi_argc = %d\n", mpi_argc );
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for( i=0; i<mpi_argc; ++i ) {
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printf( "%d %s\n", i, mpi_argv[i] );
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}
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#endif
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InitCPred( "mpi_open", 3, p_mpi_open, /*SafePredFlag|SyncPredFlag*/ 0 );
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InitCPred( "mpi_close", 0, p_mpi_close, SafePredFlag );
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InitCPred( "mpi_send", 3, p_mpi_send, SafePredFlag );
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InitCPred( "mpi_receive", 3, p_mpi_receive, SyncPredFlag );
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InitCPred( "mpi_bcast", 3, p_mpi_bcast, SyncPredFlag );
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InitCPred( "mpi_barrier", 0, p_mpi_barrier, 0 );
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}
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#endif /* HAVE_MPI */
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