From 116cda0ae03bc4e7b8571cf1658775c13c03c68e Mon Sep 17 00:00:00 2001
From: dimitri staessens <dimitri.staessens@intec.ugent.be>
Date: Sun, 4 Sep 2016 18:11:53 +0200
Subject: lib: dev: Provide a set of fds to flow_select

The flow_select call now takes as a parameter a flow_set_t, which
specifies a set of flow descriptors that will unblock the select call
when an SDU for one of them arrives. The select call has been moved to
its own header.
---
 src/lib/shm_ap_rbuff.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 82 insertions(+), 6 deletions(-)

(limited to 'src/lib/shm_ap_rbuff.c')

diff --git a/src/lib/shm_ap_rbuff.c b/src/lib/shm_ap_rbuff.c
index 6cc9590e..e6665362 100644
--- a/src/lib/shm_ap_rbuff.c
+++ b/src/lib/shm_ap_rbuff.c
@@ -348,15 +348,15 @@ int shm_ap_rbuff_peek_idx(struct shm_ap_rbuff * rb)
                 return -1;
         }
 
-        ret = (rb->shm_base + *rb->ptr_tail)->index;
+        ret = tail_el_ptr(rb)->index;
 
         pthread_mutex_unlock(rb->lock);
 
         return ret;
 }
 
-int shm_ap_rbuff_peek_b(struct shm_ap_rbuff * rb,
-                        const struct timespec * timeout)
+static int shm_ap_rbuff_peek_b_all(struct shm_ap_rbuff * rb,
+                                   const struct timespec * timeout)
 {
         struct timespec abstime;
         int ret = 0;
@@ -397,7 +397,7 @@ int shm_ap_rbuff_peek_b(struct shm_ap_rbuff * rb,
         }
 
         if (ret != ETIMEDOUT)
-                ret = (rb->shm_base + *rb->ptr_tail)->port_id;
+                ret = tail_el_ptr(rb)->port_id;
         else
                 ret = -ETIMEDOUT;
 
@@ -406,6 +406,82 @@ int shm_ap_rbuff_peek_b(struct shm_ap_rbuff * rb,
         return ret;
 }
 
+int shm_ap_rbuff_peek_b(struct shm_ap_rbuff *   rb,
+                        bool *                  set,
+                        const struct timespec * timeout)
+{
+        struct timespec abstime;
+        int ret;
+
+        if (set == NULL)
+                return shm_ap_rbuff_peek_b_all(rb, timeout);
+
+#ifdef __APPLE__
+        pthread_mutex_lock(rb->lock);
+#else
+        if (pthread_mutex_lock(rb->lock) == EOWNERDEAD) {
+                LOG_DBG("Recovering dead mutex.");
+                pthread_mutex_consistent(rb->lock);
+        }
+#endif
+        if (timeout != NULL) {
+                clock_gettime(PTHREAD_COND_CLOCK, &abstime);
+                ts_add(&abstime, timeout, &abstime);
+        }
+
+        pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
+                             (void *) rb->lock);
+
+        while ((shm_rbuff_empty(rb) || !set[tail_el_ptr(rb)->port_id])
+               && (ret != ETIMEDOUT)) {
+                while (shm_rbuff_empty(rb)) {
+                        if (timeout != NULL)
+                                ret = pthread_cond_timedwait(rb->add,
+                                                             rb->lock,
+                                                             &abstime);
+                        else
+                                ret = pthread_cond_wait(rb->add, rb->lock);
+
+#ifndef __APPLE__
+                        if (ret == EOWNERDEAD) {
+                                LOG_DBG("Recovering dead mutex.");
+                                pthread_mutex_consistent(rb->lock);
+                        }
+#endif
+                        if (ret == ETIMEDOUT)
+                                break;
+                }
+
+                while (!set[tail_el_ptr(rb)->port_id]) {
+                        if (timeout != NULL)
+                                ret = pthread_cond_timedwait(rb->del,
+                                                             rb->lock,
+                                                             &abstime);
+                        else
+                                ret = pthread_cond_wait(rb->del, rb->lock);
+
+#ifndef __APPLE__
+                        if (ret == EOWNERDEAD) {
+                                LOG_DBG("Recovering dead mutex.");
+                                pthread_mutex_consistent(rb->lock);
+                        }
+#endif
+                        if (ret == ETIMEDOUT)
+                                break;
+                }
+        }
+
+        if (ret != ETIMEDOUT)
+                ret = tail_el_ptr(rb)->port_id;
+        else
+                ret = -ETIMEDOUT;
+
+        pthread_cleanup_pop(true);
+
+        return ret;
+}
+
+
 struct rb_entry * shm_ap_rbuff_read(struct shm_ap_rbuff * rb)
 {
         struct rb_entry * e = NULL;
@@ -471,8 +547,8 @@ ssize_t shm_ap_rbuff_read_port(struct shm_ap_rbuff * rb, int port_id)
         return idx;
 }
 
-ssize_t shm_ap_rbuff_read_port_b(struct shm_ap_rbuff * rb,
-                                 int port_id,
+ssize_t shm_ap_rbuff_read_port_b(struct shm_ap_rbuff *   rb,
+                                 int                     port_id,
                                  const struct timespec * timeout)
 {
         struct timespec abstime;
-- 
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