111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <pthread.h>
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#include <talloc.h>
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#include <osmocom/core/linuxlist.h>
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#include "slotmap.h"
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/* thread-safe lookup of map by client:slot */
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struct slot_mapping *slotmap_by_client(struct slotmaps *maps, const struct client_slot *client)
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{
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struct slot_mapping *map;
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pthread_rwlock_rdlock(&maps->rwlock);
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llist_for_each_entry(map, &maps->mappings, list) {
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if (client_slot_equals(&map->client, client)) {
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pthread_rwlock_unlock(&maps->rwlock);
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return map;
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}
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}
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pthread_rwlock_unlock(&maps->rwlock);
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return NULL;
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}
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/* thread-safe lookup of map by bank:slot */
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struct slot_mapping *slotmap_by_bank(struct slotmaps *maps, const struct bank_slot *bank)
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{
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struct slot_mapping *map;
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pthread_rwlock_rdlock(&maps->rwlock);
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llist_for_each_entry(map, &maps->mappings, list) {
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if (bank_slot_equals(&map->bank, bank)) {
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pthread_rwlock_unlock(&maps->rwlock);
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return map;
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}
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}
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pthread_rwlock_unlock(&maps->rwlock);
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return NULL;
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}
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/* thread-safe creating of a new bank<->client map */
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int slotmap_add(struct slotmaps *maps, const struct bank_slot *bank, const struct client_slot *client)
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{
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struct slot_mapping *map;
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/* We assume a single thread (main thread) will ever update the mappings,
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* and hence we don't have any races by first grabbing + releasing the read
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* lock twice before grabbing the writelock below */
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map = slotmap_by_bank(maps, bank);
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if (map) {
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fprintf(stderr, "BANKD %u:%u already in use, cannot add new map\n",
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bank->bank_id, bank->slot_nr);
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return -EBUSY;
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}
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map = slotmap_by_client(maps, client);
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if (map) {
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fprintf(stderr, "CLIENT %u:%u already in use, cannot add new map\n",
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client->client_id, client->slot_nr);
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return -EBUSY;
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}
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/* allocate new mapping and add to list of mappings */
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map = talloc_zero(maps, struct slot_mapping);
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if (!map)
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return -ENOMEM;
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map->bank = *bank;
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map->client = *client;
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pthread_rwlock_wrlock(&maps->rwlock);
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llist_add_tail(&map->list, &maps->mappings);
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pthread_rwlock_unlock(&maps->rwlock);
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printf("Added Slot Map C(%u:%u) <-> B(%u:%u)\n",
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map->client.client_id, map->client.slot_nr, map->bank.bank_id, map->bank.slot_nr);
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return 0;
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}
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/* thread-safe removal of a bank<->client map */
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void slotmap_del(struct slotmaps *maps, struct slot_mapping *map)
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{
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printf("Deleting Slot Map C(%u:%u) <-> B(%u:%u)\n",
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map->client.client_id, map->client.slot_nr, map->bank.bank_id, map->bank.slot_nr);
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pthread_rwlock_wrlock(&maps->rwlock);
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llist_del(&map->list);
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pthread_rwlock_unlock(&maps->rwlock);
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talloc_free(map);
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}
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struct slotmaps *slotmap_init(void *ctx)
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{
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struct slotmaps *sm = talloc_zero(ctx, struct slotmaps);
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INIT_LLIST_HEAD(&sm->mappings);
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pthread_rwlock_init(&sm->rwlock, NULL);
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return sm;
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}
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