1 files changed, 120 insertions, 0 deletions
diff --git a/src/irmd/reg_api.c b/src/irmd/reg_api.c
new file mode 100644
index 00000000..e2da1244
--- /dev/null
+++ b/src/irmd/reg_api.c
@@ -0,0 +1,120 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * The IPC Resource Manager - Registered Application Instances
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "reg_api.h"
+
+#include <stdlib.h>
+#include <stdbool.h>
+
+struct reg_api * reg_api_create(pid_t api)
+{
+        struct reg_api * i;
+        i = malloc(sizeof(*i));
+        if (i == NULL)
+                return NULL;
+
+        i->api   = api;
+        i->state = REG_I_INIT;
+
+        pthread_mutex_init(&i->state_lock, NULL);
+        pthread_cond_init(&i->state_cond, NULL);
+
+        INIT_LIST_HEAD(&i->next);
+
+        return i;
+}
+
+void reg_api_destroy(struct reg_api * i)
+{
+        if (i == NULL)
+                return;
+
+        pthread_mutex_lock(&i->state_lock);
+
+        if (i->state != REG_I_NULL)
+                i->state = REG_I_DESTROY;
+
+        pthread_cond_signal(&i->state_cond);
+
+        pthread_mutex_unlock(&i->state_lock);
+
+        pthread_cleanup_push((void(*)(void *)) pthread_mutex_unlock,
+                             (void *) &i->state_lock);
+
+        while (i->state != REG_I_NULL)
+                pthread_cond_wait(&i->state_cond, &i->state_lock);
+
+        pthread_cleanup_pop(true);
+
+        pthread_cond_destroy(&i->state_cond);
+        pthread_mutex_destroy(&i->state_lock);
+
+        free(i);
+}
+
+static void cleanup_sleeper(void * o) {
+        struct reg_api * i = (struct reg_api *) o;
+        i->state = REG_I_NULL;
+        pthread_cond_signal(&i->state_cond);
+        pthread_mutex_unlock(&i->state_lock);
+}
+
+void reg_api_sleep(struct reg_api * i)
+{
+        if (i == NULL)
+                return;
+
+        pthread_mutex_lock(&i->state_lock);
+        if (i->state != REG_I_INIT) {
+                pthread_mutex_unlock(&i->state_lock);
+                return;
+        }
+
+        i->state = REG_I_SLEEP;
+
+        pthread_cleanup_push(cleanup_sleeper, (void *) i);
+
+        while (i->state == REG_I_SLEEP)
+                pthread_cond_wait(&i->state_cond, &i->state_lock);
+
+        pthread_cleanup_pop(true);
+}
+
+void reg_api_wake(struct reg_api * i)
+{
+        pthread_mutex_lock(&i->state_lock);
+
+        if (i->state == REG_I_NULL) {
+                pthread_mutex_unlock(&i->state_lock);
+                return;
+        }
+
+        i->state = REG_I_WAKE;
+
+        pthread_cond_broadcast(&i->state_cond);
+
+        while (i->state == REG_I_WAKE)
+                pthread_cond_wait(&i->state_cond, &i->state_lock);
+
+        pthread_mutex_unlock(&i->state_lock);
+}