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/*
* Example of coupling c program and freemfem++ script
* with mmap and semaphore
*
* the c code is : ffmaster.c
* the ff++ code is : ffslave.edp
* and here FreeFem++ is a slave process
* the compile step is
*
* cc -c libff-mmap-semaphore.c
# on linux, unix,
* cc ffmaster.c -o ffmaster libff-mmap-semaphore.o -g
# on win32
* cc ffmaster.c -o ffmaster libff-mmap-semaphore.o -g ../../3rdparty/lib/libpthread-google.a
#build the freefem++ plugin
* ff-c++ -auto ff-mmap-semaphore.cpp
# launch
# ./ffmaster
#
#
# F. Hecht Feb. 2018 Frederic.Hecht@upmc.fr
*/
/*
*
* This file is part of Freefem++
*
* Freefem++ is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* Freefem++ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Freefem++; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libff-mmap-semaphore.h"
#if defined ( _WIN32 )
# include <windows.h>
# include <process.h>
# define NO_STDIO_REDIRECT
#else
# include <unistd.h>
#endif
#include <stdlib.h>
#include <stdio.h>
ff_Psem sem_ff, sem_c; // the semaphore for mutex
/*
* Psemaphore smff("ff-slave");
* Psemaphore smc("ff-master");
* Pmmap sharedata("shared-data");
*
*/
int main(int argc, const char **argv) {
int debug = 0;
ff_Pmmap shd;
double cff, rff;
long status;
int i, ret;
if (argc > 1) {
debug = atoi(argv[1]);
}
ff_mmap_sem_verb = debug;
sem_ff = ffsem_malloc( );
sem_c = ffsem_malloc( );
shd = ffmmap_malloc( );
ffsem_init(sem_ff, "ff-slave1", 1);
ffsem_init(sem_c, "ff-master1", 1);
ffmmap_init(shd, "shared-data", 1024);
status = 1;
ffmmap_write(shd, &status, sizeof(status), 8);
ffmmap_msync(shd, 0, 32);
char ff[1024];
#ifdef _WIN32
sprintf( ff, "%d", debug );
ret = spawnl( P_NOWAIT,
"..\\FreeFem++.exe",
"..\\FreeFem++.exe",
"..\\examples\\plugin\\ffslave.edp",
"-nw", "-ns", "-v", ff, NULL );
#else
sprintf(ff, "FreeFem++ /usr/share/doc/freefem++/examples/plugin/ffslave.edp -nw -ns -v %d&", debug);
ret = system(ff); // Lauch FF++ in batch no graphique
#endif
if (ret == -1) printf("system function error\n");
if (debug) {
printf(" cc: before wait\n");
}
if (debug) {
printf(" cc: before wait 0 ff\n");
}
ffsem_wait(sem_ff);
for (i = 0; i < 10; ++i) {
printf(" iter : %d \n", i);
cff = 10 + i;
ffmmap_write(shd, &cff, sizeof(cff), 0);
ffsem_post(sem_c);
if (debug) {
printf(" cc: before wait 2\n");
}
ffsem_wait(sem_ff);
ffmmap_read(shd, &rff, sizeof(rff), 16);
printf(" iter = %d rff= %f\n", i, rff);
}
status = 0; // Fin
ffmmap_write(shd, &status, sizeof(status), 8);
ffsem_post(sem_c);
printf("Fin Master \n");
ffsem_wait(sem_ff);
ffsem_del(sem_ff);
ffsem_del(sem_c);
ffmmap_del(shd);
return 0;
}
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