lib: robust locking in shared memory and crash recovery

This PR enhances the shared memory providing recovery if a process
crashes. It adds a SHM_DU_TIMEOUT_MICROS variable, setting an
expiration time for SDU's when shared memory is full. If an
application doesn't read a blocking SDU within this time, the shared
memory will be cleansed of all SDU's for this application and the
application's rbuff will be cleared.

Some refactoring of the API's. Fixed wrong pthread checks in IRMd.

Fixes #13
Fixes #14

1 files changed, 10 insertions, 10 deletions

diff --git a/src/ipcpd/shim-udp/main.c b/src/ipcpd/shim-udp/main.c
index a28c262f..68d393af 100644
--- a/src/ipcpd/shim-udp/main.c
+++ b/src/ipcpd/shim-udp/main.c
@@ -206,12 +206,12 @@ static ssize_t ipcp_udp_flow_write(int fd, void * buf, size_t count)
 
         pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
-        while ((index = shm_create_du_buff(_ap_instance->dum,
-                                           count + DU_BUFF_HEADSPACE +
-                                           DU_BUFF_TAILSPACE,
-                                           DU_BUFF_HEADSPACE,
-                                           (uint8_t *) buf,
-                                           count)) < 0)
+        while ((index = shm_du_map_write(_ap_instance->dum,
+                                         _ap_instance->flows[fd].api,
+                                         0,
+                                         0,
+                                         (uint8_t *) buf,
+                                         count)) < 0)
                 ;
 
         e.index   = index;
@@ -772,9 +772,9 @@ static void * ipcp_udp_sdu_loop(void * o)
                         return (void *) 1; /* -ENOTENROLLED */
                 }
 
-                len = shm_du_map_read_sdu((uint8_t **) &buf,
-                                          _ap_instance->dum,
-                                          e->index);
+                len = shm_du_map_read((uint8_t **) &buf,
+                                      _ap_instance->dum,
+                                      e->index);
                 if (len <= 0) {
                         pthread_rwlock_unlock(&_ipcp->state_lock);
                         free(e);
@@ -799,7 +799,7 @@ static void * ipcp_udp_sdu_loop(void * o)
                 pthread_rwlock_rdlock(&_ipcp->state_lock);
 
                 if (_ap_instance->dum != NULL)
-                        shm_release_du_buff(_ap_instance->dum, e->index);
+                        shm_du_map_remove(_ap_instance->dum, e->index);
 
                 pthread_rwlock_unlock(&_ipcp->state_lock);
         }