//thread for read operations
void *threadreadlock(void *vargp)
{
printf("%s\n", "Wait for reading!");
rwlock_lockRead(&rwl); //read lock
printf("%s%d\n", "Reading... Value: ", i); //read and print value
//rwlock_getInfo(&rwl);
rwlock_unlock(&rwl); //read unlock
return NULL;
}
static void *reader1(void *arg) {
//Leselock anfordern
rwlock_lockRead(&filelock);
printf("Reader 1 working...\n");
//Datei öffnen
fp = fopen("testb.txt","rt");
if (fp == NULL) {
printf("Error trying to open testb.txt\n");
return NULL;
}
//Datei komplett auslesen
int c;
while ((c = getc(fp)) != EOF) {
putchar(c);
}
fclose(fp);
printf("Reader 1 done.\n");
rwlock_unlock(&filelock);
return NULL;
}
static void *reader(void *arg) {
// 2 Runden
int c;
for(c = 0;c <2; c++){
// Lese lock anfordern
rwlock_lockRead(&varlock);
printf("Reader printing...%u.\n",(unsigned int) pthread_self());
int i;
// Runde Nr., i und die Threadid ausgeben und zwischendurch warten
for(i = 1; i <= 20 ; i++) {
printf("c = %d i = %d count = %d \t %u.\n", c, i, count,(unsigned int) pthread_self());
if (i % 50)
sleep(rand() % 2);
}
//Readlock weg
rwlock_unlock(&varlock);
printf("Reader waiting...%u\n",(unsigned int) pthread_self());
sleep(1);
}
printf("Reader done..%u\n",(unsigned int) pthread_self());
return NULL;
}
