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שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 7 - MAKEFILES/MakeFiles.pdf

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+version https://git-lfs.github.com/spec/v1
+oid sha256:d5d6ff8a12f57a7da84f00560e9aa7b3d72cba7b9385fa5bc03f00ef82436b29
+size 353834

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 7 - MAKEFILES/Makefile_Macros.pdf

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+version https://git-lfs.github.com/spec/v1
+oid sha256:2d68a7455890dcb8428e11c29dafd9f1764c494ebf234878039e7636b690d2ac
+size 186

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 7 - MAKEFILES/Makefile_Macros_Names.pdf

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+version https://git-lfs.github.com/spec/v1
+oid sha256:ad2ff47f22d0128804a20ba90a400c96b863a8ab1f11809409c19b613186baa4
+size 325

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice1.c

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+#include <unistd.h>
+
+void main()
+{
+	nice(4);
+        while(1){};
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice2.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+void main()
+{
+        int pri;
+
+        pri = getpriority ( PRIO_PROCESS , getpid() );
+        printf ("1.The nice/priority is %d\n", pri );
+
+        nice(3);
+
+        pri = getpriority ( PRIO_PROCESS , getpid() );
+        printf ("2.The nice/priority is %d\n", pri );
+        
+        nice(5);
+
+        pri=getpriority ( PRIO_PROCESS , getpid() );
+        printf ("2.The nice/priority is %d\n", pri );
+
+        while (1) {}
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice3.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+void main()
+{
+        int pri;
+	int res =0;
+
+        res = setpriority( PRIO_PROCESS , getpid() , 10 );
+        printf ( "1.res number is %d\n" , res);
+        pri = getpriority ( PRIO_PROCESS , getpid() );
+        printf ( "1.The nice/priority is %d\n" , pri );
+        
+        while (1) {};
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice4.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+void main()
+{
+        int pri;
+        int user_id;
+        int res = -1;
+        
+        user_id = getuid();
+        
+        printf("the user id is %d\n",user_id);
+
+	res = setpriority( PRIO_USER , user_id , 4 );
+	
+	printf("The return value is %d, error no is %d. user id is %d\n",res,errno,user_id);
+        
+        pri = getpriority ( PRIO_USER , user_id );
+        
+        printf ( "Priority is %d for user is %d\n" , pri, user_id );
+        
+        while (1) {};
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice5.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+void main()
+{
+        int pri;
+
+        pri = getpriority ( PRIO_USER , getuid() );
+        printf ( "%d\n" , pri );
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 8 - NICE/nice6.c

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+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <stdio.h>
+
+int main()
+{
+	int which, prio=10,prio_res;
+	id_t who=getpid();
+	
+	which = PRIO_PROCESS;	
+	
+	prio_res = getpriority(which, who);
+	printf("1. Nice value = %d\n", prio_res);
+
+	setpriority(which, who, prio);
+	printf("2. Try to set the Nice value to = %d\n", prio);
+	
+	prio_res = getpriority(which, who);
+	printf("2. Nice value = %d\n", prio_res);
+
+	prio=19;
+	setpriority(which, who, prio);
+	printf("3. Try to set the Nice value to = %d\n", prio);
+	
+	prio_res = getpriority(which, who);
+	printf("4. Nice value = %d\n", prio_res);
+	
+	return 0;
+}

שנה ב/סמסטר ב/מערכות הפעלה/תרגולים/תרגול 9 - Semaphores/ipc4.c

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+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+
+union semun
+{
+	int              val;    /* Value for SETVAL */
+        struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */
+        unsigned short  *array;  /* Array for GETALL, SETALL */
+        struct seminfo  *__buf;  /* Buffer for IPC_INFO                                        /*   (Linux-specific) */
+};
+
+
+int main()
+{
+       int semid; 
+       union semun semarg;
+       int i;
+       struct sembuf sops[1];// see declaration of sembuf in Google
+
+       semid = semget ( IPC_PRIVATE , 1 , IPC_CREAT | IPC_EXCL);//0666 );// 1- create only one semaphore
+       printf("1. The Semaphore ID is %d\n",semid);
+       semarg.val = 1;
+       semctl ( semid , 0 , SETVAL , semarg );// 0 - only one semaphore . SETVAL - the command
+       sops->sem_num = 0;// only one semaphore
+       sops->sem_flg = 0;// no special options
+       if ( fork() == 0 ) {
+             sops->sem_op = -1; // try to decrease the sem. from 1 to 0
+             semop ( semid , sops , 1 );// 1- only one operation . operate the decrease
+             printf ("2. Child : semapore is locked now\n");
+             sleep( 8 );//sleep for 8 seconds
+             sops->sem_op = 1; // increase the sem. from 0 to 1
+             semop ( semid , sops , 1 ); // operate the increase
+             printf("3. Child is finished\n");
+       }
+       else {
+             sleep( 4 );//sleep for 4 seconds
+             printf("4. Parent is waiting for child to release semaphore\n");
+             sops->sem_op = -1;
+             semop ( semid , sops , 1 );
+             printf("5. Parent finished\n");
+             semctl ( semid , 0 , IPC_RMID , semarg ); // The last argument is not really needed
+       }
+       return 0;
+}
+