FedericoB: Aggiunta soluzione di un'altro studente e migliorata organizzazione pagina.

2017-05-09T07:48:18Z

Aggiunta soluzione di un'altro studente e migliorata organizzazione pagina.

Gab: Created page with "[http://www.cs.unibo.it/~renzo/so/pratiche/2010-07-19.pdf Link to exam] Esercizio1 #include "stdlib.h" #include "stdio.h" #include "unistd.h" #inc..."

2014-05-01T21:46:55Z

Created page with "[http://www.cs.unibo.it/~renzo/so/pratiche/2010-07-19.pdf Link to exam] Esercizio1 <syntaxhighlight lang="C"> #include "stdlib.h" #include "stdio.h" #include "unistd.h" #inc..."

New page

[http://www.cs.unibo.it/~renzo/so/pratiche/2010-07-19.pdf Link to exam]

Esercizio1

<syntaxhighlight lang="C">
#include "stdlib.h"
#include "stdio.h"
#include "unistd.h"
#include "string.h"
#include <sys/time.h>
#include <signal.h>

#define MESSAGE_LENGTH 40
#define NUMBER_OF_MESSAGE 100000

int main(int argc,char *arv[])
{
int childToParentPipe[2];
int parentToChildPipe[2];
pipe(childToParentPipe);
pipe(parentToChildPipe);
int childPID = fork();
if(childPID)
{
/* parent */
int toReadDescriptor = childToParentPipe[0];
int toWriteDescriptor = parentToChildPipe[1];
close(childToParentPipe[1]);
close(parentToChildPipe[0]);
char messageToSend[MESSAGE_LENGTH];
int index = 0;
for(index = 0 ; index<MESSAGE_LENGTH;index++)
messageToSend[index] = 'M';
messageToSend[MESSAGE_LENGTH-1]='\0';
char messageToRead[MESSAGE_LENGTH];
struct timeval startTime;
struct timeval endTime;
gettimeofday(&startTime,NULL);
for(index = 0;index <NUMBER_OF_MESSAGE;index++ )
{
write(toWriteDescriptor,messageToSend,MESSAGE_LENGTH);
read(toReadDescriptor,&messageToRead,MESSAGE_LENGTH);
}
gettimeofday(&endTime,NULL);
struct timeval timeUsed;
timersub(&endTime,&startTime,&timeUsed);
printf("Time taken %ld seconds and %d useconds \n", timeUsed.tv_sec, timeUsed.tv_usec);
kill(childPID,SIGTERM);
}
else
{
/* child */
int toReadDescriptor = parentToChildPipe[0];
int toWriteDescriptor = childToParentPipe[1];
close(childToParentPipe[0]);
close(parentToChildPipe[1]);
char arrivedMessage[MESSAGE_LENGTH];
while(1)
{
read(toReadDescriptor,arrivedMessage,MESSAGE_LENGTH);
write(toWriteDescriptor,arrivedMessage,strlen(arrivedMessage));
}
}
return 0;
}
</syntaxhighlight>

Esercizio2

<syntaxhighlight lang="C">
#include "stdlib.h"
#include "stdio.h"
#include "unistd.h"
#include "string.h"
#include <sys/time.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <signal.h>

#define MESSAGE_LENGTH 40
#define NUMBER_OF_MESSAGE 100000

#define PARENT_TO_CHILD_TAG 1

#define CHILD_TO_PARENT_TAG 2

typedef struct MessageBody
{
long type;
char message[MESSAGE_LENGTH];
} MessageBody;

int main(int argc,char *arv[])
{
int messageQueueID = msgget(IPC_PRIVATE, 0666);
int childPID = fork();
if(childPID)
{
/* parent */
MessageBody messageToSend;
messageToSend.type = 1;
int index;
for(index = 0;index<MESSAGE_LENGTH;index++)
messageToSend.message[index] = 'M';
messageToSend.message[MESSAGE_LENGTH-1] = '\0';
MessageBody messageReceived;
struct timeval startTime;
struct timeval endTime;
gettimeofday(&startTime,NULL);
for(index = 0;index < NUMBER_OF_MESSAGE;index++)
{
msgsnd(messageQueueID,&messageToSend,MESSAGE_LENGTH,0);
msgrcv(messageQueueID,&messageReceived,MESSAGE_LENGTH,2,MSG_NOERROR);
}
gettimeofday(&endTime,NULL);
struct timeval timeUsed;
timersub(&endTime,&startTime,&timeUsed);
printf("Time taken %ld seconds and %d useconds \n", timeUsed.tv_sec, timeUsed.tv_usec);
kill(childPID,SIGTERM);
}
else
{
/* child */
while(1)
{
MessageBody messageReceived;
msgrcv(messageQueueID,&messageReceived,MESSAGE_LENGTH,1,MSG_NOERROR);
messageReceived.type = 2;
msgsnd(messageQueueID,&messageReceived,MESSAGE_LENGTH,0);
}
}
return 0;
}
</syntaxhighlight>

Gab

@@ Line 1: / Line 1: @@
 [http://www.cs.unibo.it/~renzo/so/pratiche/2010-07-19.pdf Link to exam]
-Esercizio1
+==Esercizio1==
+===Soluzione di Gab===
 <syntaxhighlight lang="C">
 #include "stdlib.h"
@@ Line 67: / Line 67: @@
 </syntaxhighlight>
+==Esercizio2==
+===Soluzione di Gab===
 <syntaxhighlight lang="C">
 #include "stdlib.h"
@@ Line 138: / Line 136: @@
 </syntaxhighlight>
-Gab
+==Esercizio 3==

ProvaPratica 2010.07.19 - Revision history

FedericoB: Aggiunta soluzione di un'altro studente e migliorata organizzazione pagina.

Gab: Created page with "[http://www.cs.unibo.it/~renzo/so/pratiche/2010-07-19.pdf Link to exam] Esercizio1 #include "stdlib.h" #include "stdio.h" #include "unistd.h" #inc..."