//thread for write operations
void *threadwritelock(void *vargp)
{
printf("%s\n", "Wait for writing!");
rwlock_lockWrite(&rwl); //write lock
printf("%s\n", "Writing.....");
i = i + 1; //increase value
//rwlock_getInfo(&rwl);
rwlock_unlock(&rwl); //write unlock
return NULL;
}
static void *writer3(void *arg) {
rwlock_lockWrite(&filelock);
printf("Writer 3 working...\n");
fp = fopen("testb.txt","a");
if (fp == NULL) {
printf("Error trying to open testb.txt\n");
return NULL;
}
int i;
for(i = 200; i < 300; i++) {
fprintf(fp,"%d w3\n",i);
if (i % 20 == 0)
sleep(1);
}
fclose(fp);
printf("Writer 3 done.\n");
rwlock_unlock(&filelock);
return NULL;
}
static void *writer(void *arg) {
int c;
// 2 Runden
for(c = 0;c <2; c++){
// Writelock aktiv
rwlock_lockWrite(&varlock);
printf("Writer incrementing...\n");
//hochzählen
int i;
for(i = 0; i < 100; i++) {
count++;
}
printf("Writer waiting...\n");
//Writelock weg
rwlock_unlock(&varlock);
sleep(1);
}
printf("Writer done.\n");
return NULL;
}
// 3 mal dasselbe für writer1..3
static void *writer1(void *arg) {
//Writelock anfordern
rwlock_lockWrite(&filelock);
printf("Writer 1 working...\n");
//Datei öffnen ...
fp = fopen("testb.txt","a");
if (fp == NULL) {
printf("Error trying to open testb.txt\n");
return NULL;
}
//Zahlen schreiben
int i;
for(i = 0; i < 100; i++) {
fprintf(fp,"%d w1\n",i);
if (i % 20 == 0)
sleep(1);
}
fclose(fp);
printf("Writer 1 done.\n");
//Writelock weg
rwlock_unlock(&filelock);
return NULL;
}
