1 files changed, 151 insertions, 0 deletions
diff --git a/src/lib/cdap_req.c b/src/lib/cdap_req.c
new file mode 100644
index 00000000..02fa0846
--- /dev/null
+++ b/src/lib/cdap_req.c
@@ -0,0 +1,151 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * CDAP - CDAP request management
+ *
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *    Dimitri Staessens <dimitri.staessens@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 <ouroboros/config.h>
+#include <ouroboros/time_utils.h>
+#include <ouroboros/errno.h>
+
+#include "cdap_req.h"
+
+#include <stdlib.h>
+#include <assert.h>
+
+struct cdap_req * cdap_req_create(cdap_key_t key)
+{
+        struct cdap_req * creq = malloc(sizeof(*creq));
+        pthread_condattr_t cattr;
+
+        if (creq == NULL)
+                return NULL;
+
+        creq->key = key;
+        creq->state     = REQ_INIT;
+
+        creq->response = -1;
+        creq->data.data = NULL;
+        creq->data.len  = 0;
+
+        pthread_condattr_init(&cattr);
+#ifndef __APPLE__
+        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
+#endif
+        pthread_cond_init(&creq->cond, &cattr);
+        pthread_mutex_init(&creq->lock, NULL);
+
+        INIT_LIST_HEAD(&creq->next);
+
+        clock_gettime(PTHREAD_COND_CLOCK, &creq->birth);
+
+        return creq;
+}
+
+void cdap_req_destroy(struct cdap_req * creq)
+{
+        assert(creq);
+
+        pthread_mutex_lock(&creq->lock);
+
+        if (creq->state == REQ_DESTROY) {
+                pthread_mutex_unlock(&creq->lock);
+                return;
+        }
+
+        if (creq->state == REQ_INIT)
+                creq->state = REQ_DONE;
+
+        if (creq->state == REQ_PENDING) {
+                creq->state = REQ_DESTROY;
+                pthread_cond_broadcast(&creq->cond);
+        }
+
+        while (creq->state != REQ_DONE)
+                pthread_cond_wait(&creq->cond, &creq->lock);
+
+        pthread_mutex_unlock(&creq->lock);
+
+        pthread_cond_destroy(&creq->cond);
+        pthread_mutex_destroy(&creq->lock);
+
+        free(creq);
+}
+
+int cdap_req_wait(struct cdap_req * creq)
+{
+        struct timespec timeout = {(CDAP_REPLY_TIMEOUT / 1000),
+                                   (CDAP_REPLY_TIMEOUT % 1000) * MILLION};
+        struct timespec abstime;
+        int ret = -1;
+
+        assert(creq);
+
+        ts_add(&creq->birth, &timeout, &abstime);
+
+        pthread_mutex_lock(&creq->lock);
+
+        if (creq->state != REQ_INIT) {
+                pthread_mutex_unlock(&creq->lock);
+                return -EINVAL;
+        }
+
+        creq->state = REQ_PENDING;
+
+        while (creq->state == REQ_PENDING) {
+                if ((ret = -pthread_cond_timedwait(&creq->cond,
+                                                   &creq->lock,
+                                                   &abstime)) == -ETIMEDOUT)
+                        break;
+        }
+
+        if (creq->state == REQ_DESTROY)
+                ret = -1;
+
+        creq->state = REQ_DONE;
+        pthread_cond_broadcast(&creq->cond);
+
+        pthread_mutex_unlock(&creq->lock);
+
+        return ret;
+}
+
+void cdap_req_respond(struct cdap_req * creq, int response, buffer_t data)
+{
+        assert(creq);
+
+        pthread_mutex_lock(&creq->lock);
+
+        if (creq->state != REQ_PENDING) {
+                pthread_mutex_unlock(&creq->lock);
+                return;
+        }
+
+        creq->state    = REQ_RESPONSE;
+        creq->response = response;
+        creq->data     = data;
+
+        pthread_cond_broadcast(&creq->cond);
+
+        while (creq->state == REQ_RESPONSE)
+                pthread_cond_wait(&creq->cond, &creq->lock);
+
+        pthread_mutex_unlock(&creq->lock);
+}