example1

//Writed by YaoPu, Oct 10 2016
//Connect via yaopu@iccas.ac.cn
#include<stdio.h>
#include"mpi.h"
#include<string.h>
int master_io(void);
int slave_io(void);
int main(int argc, char **argv)
{
int rank,size;
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
printf("********************rank=%d*************************n",rank);
if(rank==0)
master_io();
else
	slave_io();
MPI_Finalize();
return 0;
}
#define MSG_EXIT 1
#define MSG_PRINT_ORDERED 2
#define MSG_PRINT_UNORDERED 3

int master_io(void)
{
int i,j,size,nslave,firstmsg,rank;
char buf[256],buf2[256];
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
printf("****************io io io rank= %d io io io******n",rank);
MPI_Status status;
MPI_Comm_size(MPI_COMM_WORLD,&size);
nslave=size-1;
while(nslave>0){
MPI_Recv(buf,256,MPI_CHAR,MPI_ANY_SOURCE,MPI_ANY_TAG,MPI_COMM_WORLD,&status);
switch(status.MPI_TAG){
case MSG_EXIT:nslave--;break;
case MSG_PRINT_UNORDERED:fputs(buf,stdout);break;
case MSG_PRINT_ORDERED:
firstmsg=status.MPI_SOURCE;
for (i=1;i<size;i++){
if(i==firstmsg)
fputs(buf,stdout);
else{
MPI_Recv(buf2,256,MPI_CHAR,i,MSG_PRINT_ORDERED,MPI_COMM_WORLD,&status);
fputs(buf2,stdout);
}
}
break;
}
}
}

int slave_io(void)
{
char buf[256];
int rank;
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
sprintf(buf,"Hello from slave %d, ordered printn",rank);
MPI_Send(buf,strlen(buf)+1,MPI_CHAR,0,MSG_PRINT_ORDERED,MPI_COMM_WORLD);
sprintf(buf,"Goodbye from slave %d,ordered print n",rank);
MPI_Send(buf,strlen(buf)+1,MPI_CHAR,0,MSG_PRINT_ORDERED,MPI_COMM_WORLD);
sprintf(buf,"I am exiting (%d) ,unordered printn",rank);
MPI_Send(buf,strlen(buf)+1,MPI_CHAR,0,MSG_PRINT_UNORDERED,MPI_COMM_WORLD);
MPI_Send(buf,0,MPI_CHAR,0,MSG_EXIT,MPI_COMM_WORLD);
} 

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