/**
* Declares the shared memory segment this process will be using and the files it will ever possibly open. This must be called before sfs_fopen().
*
* Parameters: sys_key - The ID of the shared memory segment initialized in sfs_init.
* file_num - The number of files this process might open (or size of filenames)
* filenames - The names of the files this process wishes to open (in the future).
* Returns: 1 on success, 0 otherwise
*/
int sfs_declare(int sys_key, int file_num, char *filenames[]) {
// Initialize shared memory pointers
segment_id = get_segment_id(sys_key);
if(segment_id == -1) return 0;
shared_memory = (char *) shmat(segment_id, NULL, 0);
if(shared_memory == (void *)-1) return 0;
memory = (memory_layout *) shared_memory;
mutex_lock(memory);
// Create process node for this process
node *process = create_process_node(memory);
if(process == NULL) {
mutex_unlock(memory);
return 0;
}
// Create or get resource nodes for all files
int i;
for(i = 0; i < file_num; i++) {
char *name = filenames[i];
node *resource = find_or_create_file_node(memory, name);
if(resource == NULL) {
mutex_unlock(memory);
return 0;
}
// Record that this process has claim edges to the given files
node *list_node_cur = create_list_node(memory, resource, &process->out_edges);
if(list_node_cur == NULL) {
mutex_unlock(memory);
return 0;
}
}
mutex_unlock(memory);
return 1;
}
/**
* Add an outgoing edge from the start node to the end node (process or resource)
*/
int add_out_edge(memory_layout *mem, node *start, node *end) {
if(create_list_node(mem, end, &start->out_edges) != NULL) {
return 1;
}
return 0;
}
int main(void)
{
list* l = initialize_list();
list_node* c_node = create_list_node("c");
list_node* a_node = create_list_node("a");
list_node* z_node = create_list_node("z");
list_node* x_node = create_list_node("x");
push_list_node(l, a_node);
remove_internal_list_node(l, a_node);
push_list_node(l, a_node);
push_list(l, "b");
push_list_node(l, c_node);
unshift_list_node(l, z_node);
unshift_list(l, "y");
unshift_list_node(l, x_node);
remove_internal_list_node(l, z_node);
remove_internal_list_node(l, a_node);
remove_internal_list_node(l, x_node);
free_list_node(z_node);
free_list_node(a_node);
free_list_node(x_node);
while(l->length > 0)
{
printf("%s\n", (char*)pop_list(l));
}
unsigned long dl;
destroy_list(l, DESTROY_MODE_IGNORE_VALUES, &dl);
printf("-------queue test-------------\n");
unsigned long priority;
char* id;
priority_queue* pq = initialize_priority_queue();
push_priority_queue(pq, 30, "id_1", "value_1");
push_priority_queue(pq, 10, "id_2", "value_2");
push_priority_queue(pq, 10, "id_3", "value_3");
push_priority_queue(pq, 40, "id_4", "value_4");
push_priority_queue(pq, 5, "id_5", "value_5");
push_priority_queue(pq, 30, "id_6", "value_6");
push_priority_queue(pq, 30, "id_7", "value_7");
printf("queue length = %ld\n", pq->length);
unsigned long num_destroyed;
char* tmp = peek_priority_queue(pq, &priority, &id, 0);
printf("first is \"%s\"\n", tmp);
set_priority_for_id_in_priority_queue(pq, "id_5", 35);
tmp = peek_priority_queue(pq, &priority, &id, 0);
printf("first is \"%s\"\n", tmp);
set_priority_for_id_in_priority_queue(pq, "id_2", 36);
tmp = peek_priority_queue(pq, &priority, &id, 0);
printf("first is \"%s\"\n", tmp);
/*
char** values = (char**)destroy_priority_queue(pq, DESTROY_MODE_RETURN_VALUES, &num_destroyed);
int index = 0;
for(index = 0; values[index] != NULL; index++)
{
printf("%s\n", values[index]);
}
*/
while(pq->length > 0)
{
char* value = (char*)shift_priority_queue(pq, &priority, &id);
printf("%s\n", value);
free(id);
}
destroy_priority_queue(pq, DESTROY_MODE_FREE_VALUES, &dl);
return 0;
}