lib, irmd, ipcp: robust mutexes

Update to POSIX 200112L to allow use of robust mutexes in the
shm_du_map. Removed the implementation of the rw_lock in favor of
pthread_rwlock_t.

Placeholder for the shm_du_map_sanitize function.

4 files changed, 95 insertions, 206 deletions

diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 7db083b6..ed7f2fc6 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -32,7 +32,6 @@ set(SOURCE_FILES
   ipcp.c
   irm.c
   list.c
-  rw_lock.c
   shm_ap_rbuff.c
   shm_du_map.c
   sockets.c
diff --git a/src/lib/dev.c b/src/lib/dev.c
index ab4365b8..1725cca3 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -31,7 +31,6 @@
 #include <ouroboros/shm_du_map.h>
 #include <ouroboros/shm_ap_rbuff.h>
 #include <ouroboros/utils.h>
-#include <ouroboros/rw_lock.h>
 
 #include <stdlib.h>
 #include <string.h>
@@ -49,10 +48,10 @@ struct ap_data {
         struct shm_du_map *   dum;
         struct bmp *          fds;
         struct shm_ap_rbuff * rb;
-        rw_lock_t             data_lock;
+        pthread_rwlock_t      data_lock;
 
         struct flow           flows[AP_MAX_FLOWS];
-        rw_lock_t             flows_lock;
+        pthread_rwlock_t      flows_lock;
 } * _ap_instance;
 
 int ap_init(char * ap_name)
@@ -109,8 +108,8 @@ int ap_init(char * ap_name)
                 _ap_instance->flows[i].port_id = -1;
         }
 
-        rw_lock_init(&_ap_instance->flows_lock);
-        rw_lock_init(&_ap_instance->data_lock);
+        pthread_rwlock_init(&_ap_instance->flows_lock, NULL);
+        pthread_rwlock_init(&_ap_instance->data_lock, NULL);
 
         return 0;
 }
@@ -122,7 +121,7 @@ void ap_fini(void)
         if (_ap_instance == NULL)
                 return;
 
-        rw_lock_wrlock(&_ap_instance->data_lock);
+        pthread_rwlock_wrlock(&_ap_instance->data_lock);
 
         if (_ap_instance->api != NULL)
                 instance_name_destroy(_ap_instance->api);
@@ -133,14 +132,14 @@ void ap_fini(void)
         if (_ap_instance->rb != NULL)
                 shm_ap_rbuff_destroy(_ap_instance->rb);
 
-        rw_lock_rdlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
         for (i = 0; i < AP_MAX_FLOWS; ++i)
                 if (_ap_instance->flows[i].rb != NULL)
                         shm_ap_rbuff_close(_ap_instance->flows[i].rb);
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         free(_ap_instance);
 }
@@ -166,12 +165,12 @@ int flow_accept(char ** ae_name)
         msg.code    = IRM_MSG_CODE__IRM_FLOW_ACCEPT;
         msg.has_pid = true;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
 
         msg.ap_name = _ap_instance->api->name;
         msg.pid     = _ap_instance->api->id;
 
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL) {
@@ -183,13 +182,13 @@ int flow_accept(char ** ae_name)
                 return -1;
         }
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_wrlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_wrlock(&_ap_instance->flows_lock);
 
         cfd = bmp_allocate(_ap_instance->fds);
         if (!bmp_is_id_valid(_ap_instance->fds, cfd)) {
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
@@ -197,8 +196,8 @@ int flow_accept(char ** ae_name)
         _ap_instance->flows[cfd].rb = shm_ap_rbuff_open(recv_msg->pid);
         if (_ap_instance->flows[cfd].rb == NULL) {
                 bmp_release(_ap_instance->fds, cfd);
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
@@ -208,8 +207,8 @@ int flow_accept(char ** ae_name)
                 if (*ae_name == NULL) {
                         shm_ap_rbuff_close(_ap_instance->flows[cfd].rb);
                         bmp_release(_ap_instance->fds, cfd);
-                        rw_lock_unlock(&_ap_instance->flows_lock);
-                        rw_lock_unlock(&_ap_instance->data_lock);
+                        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                        pthread_rwlock_unlock(&_ap_instance->data_lock);
                         irm_msg__free_unpacked(recv_msg, NULL);
                         return -1;
                 }
@@ -218,8 +217,8 @@ int flow_accept(char ** ae_name)
         _ap_instance->flows[cfd].port_id = recv_msg->port_id;
         _ap_instance->flows[cfd].oflags  = FLOW_O_DEFAULT;
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         irm_msg__free_unpacked(recv_msg, NULL);
 
@@ -241,31 +240,31 @@ int flow_alloc_resp(int fd,
         msg.pid          = _ap_instance->api->id;
         msg.has_port_id  = true;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_rdlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
         msg.port_id      = _ap_instance->flows[fd].port_id;
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
 
         msg.has_response = true;
         msg.response     = response;
 
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return -1;
         }
 
         if (!recv_msg->has_result) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
 
         ret = recv_msg->result;
 
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         irm_msg__free_unpacked(recv_msg, NULL);
 
@@ -291,11 +290,11 @@ int flow_alloc(char * dst_name,
         msg.ae_name     = src_ae_name;
         msg.has_pid     = true;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
 
         msg.pid         = _ap_instance->api->id;
 
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL) {
@@ -307,13 +306,13 @@ int flow_alloc(char * dst_name,
                 return -1;
         }
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_wrlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_wrlock(&_ap_instance->flows_lock);
 
         fd = bmp_allocate(_ap_instance->fds);
         if (!bmp_is_id_valid(_ap_instance->fds, fd)) {
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
@@ -321,8 +320,8 @@ int flow_alloc(char * dst_name,
         _ap_instance->flows[fd].rb = shm_ap_rbuff_open(recv_msg->pid);
         if (_ap_instance->flows[fd].rb == NULL) {
                 bmp_release(_ap_instance->fds, fd);
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
@@ -330,8 +329,8 @@ int flow_alloc(char * dst_name,
         _ap_instance->flows[fd].port_id = recv_msg->port_id;
         _ap_instance->flows[fd].oflags  = FLOW_O_DEFAULT;
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         irm_msg__free_unpacked(recv_msg, NULL);
 
@@ -350,13 +349,13 @@ int flow_alloc_res(int fd)
         msg.code         = IRM_MSG_CODE__IRM_FLOW_ALLOC_RES;
         msg.has_port_id  = true;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_rdlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
         msg.port_id      = _ap_instance->flows[fd].port_id;
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL) {
@@ -384,8 +383,8 @@ int flow_dealloc(int fd)
         msg.code         = IRM_MSG_CODE__IRM_FLOW_DEALLOC;
         msg.has_port_id  = true;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_wrlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_wrlock(&_ap_instance->flows_lock);
 
         msg.port_id      = _ap_instance->flows[fd].port_id;
 
@@ -395,23 +394,23 @@ int flow_dealloc(int fd)
 
         bmp_release(_ap_instance->fds, fd);
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
 
         recv_msg = send_recv_irm_msg(&msg);
         if (recv_msg == NULL) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return -1;
         }
 
         if (!recv_msg->has_result) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 irm_msg__free_unpacked(recv_msg, NULL);
                 return -1;
         }
 
         ret = recv_msg->result;
 
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         irm_msg__free_unpacked(recv_msg, NULL);
 
@@ -425,24 +424,24 @@ int flow_cntl(int fd, int cmd, int oflags)
         if (fd < 0)
                 return -EBADF;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_wrlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_wrlock(&_ap_instance->flows_lock);
 
         old = _ap_instance->flows[fd].oflags;
 
         switch (cmd) {
         case FLOW_F_GETFL: /* GET FLOW FLAGS */
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return old;
         case FLOW_F_SETFL: /* SET FLOW FLAGS */
                 _ap_instance->flows[fd].oflags = oflags;
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return old;
         default:
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return FLOW_O_INVALID; /* unknown command */
         }
 }
@@ -458,8 +457,8 @@ ssize_t flow_write(int fd, void * buf, size_t count)
         if (fd < 0)
                 return -EBADF;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_rdlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
         if (_ap_instance->flows[fd].oflags & FLOW_O_NONBLOCK) {
                 index = shm_create_du_buff(_ap_instance->dum,
@@ -469,8 +468,8 @@ ssize_t flow_write(int fd, void * buf, size_t count)
                                            (uint8_t *) buf,
                                            count);
                 if (index == -1) {
-                        rw_lock_unlock(&_ap_instance->flows_lock);
-                        rw_lock_unlock(&_ap_instance->data_lock);
+                        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                        pthread_rwlock_unlock(&_ap_instance->data_lock);
                         return -1;
                 }
 
@@ -479,8 +478,8 @@ ssize_t flow_write(int fd, void * buf, size_t count)
 
                 if (shm_ap_rbuff_write(_ap_instance->flows[fd].rb, &e) < 0) {
                         shm_release_du_buff(_ap_instance->dum, index);
-                        rw_lock_unlock(&_ap_instance->flows_lock);
-                        rw_lock_unlock(&_ap_instance->data_lock);
+                        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                        pthread_rwlock_unlock(&_ap_instance->data_lock);
                         return -EPIPE;
                 }
         } else { /* blocking */
@@ -499,8 +498,8 @@ ssize_t flow_write(int fd, void * buf, size_t count)
                         ;
         }
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         return 0;
 }
@@ -514,12 +513,12 @@ ssize_t flow_read(int fd, void * buf, size_t count)
         if (fd < 0)
                 return -EBADF;
 
-        rw_lock_rdlock(&_ap_instance->data_lock);
-        rw_lock_rdlock(&_ap_instance->flows_lock);
+        pthread_rwlock_rdlock(&_ap_instance->data_lock);
+        pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
         if (_ap_instance->flows[fd].port_id < 0) {
-                rw_lock_unlock(&_ap_instance->flows_lock);
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->flows_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return -1;
         }
 
@@ -533,10 +532,10 @@ ssize_t flow_read(int fd, void * buf, size_t count)
                         ;
         }
 
-        rw_lock_unlock(&_ap_instance->flows_lock);
+        pthread_rwlock_unlock(&_ap_instance->flows_lock);
 
         if (idx < 0) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return -1;
         }
 
@@ -544,7 +543,7 @@ ssize_t flow_read(int fd, void * buf, size_t count)
                                 _ap_instance->dum,
                                 idx);
         if (n < 0) {
-                rw_lock_unlock(&_ap_instance->data_lock);
+                pthread_rwlock_unlock(&_ap_instance->data_lock);
                 return -1;
         }
 
@@ -552,7 +551,7 @@ ssize_t flow_read(int fd, void * buf, size_t count)
 
         shm_release_du_buff(_ap_instance->dum, idx);
 
-        rw_lock_unlock(&_ap_instance->data_lock);
+        pthread_rwlock_unlock(&_ap_instance->data_lock);
 
         return n;
 }
diff --git a/src/lib/rw_lock.c b/src/lib/rw_lock.c
deleted file mode 100644
index ba285694..00000000
--- a/src/lib/rw_lock.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016
- *
- * Read/Write locks
- *
- *    Dimitri Staessens <[email protected]>
- *
- * 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/rw_lock.h>
-
-int rw_lock_init(rw_lock_t * lock)
-{
-        if (lock == NULL)
-                return -1;
-
-        pthread_mutex_init(&lock->lock, NULL);
-        pthread_mutex_init(&lock->i_lock, NULL);
-        lock->i = 0;
-
-        return 0;
-}
-
-void rw_lock_destroy(rw_lock_t * lock)
-{
-        if (lock == NULL)
-                return;
-
-        pthread_mutex_destroy(&lock->lock);
-        pthread_mutex_destroy(&lock->i_lock);
-        lock->i = -1;
-}
-
-int rw_lock_rdlock(rw_lock_t * lock)
-{
-        int ret = 0;
-
-        if (lock == NULL)
-                return -1;
-
-        pthread_mutex_lock(&lock->i_lock);
-
-        if (lock->i < 0) {
-                pthread_mutex_unlock(&lock->i_lock);
-                return -1;
-        }
-
-        if (lock->i == 0)
-                ret = pthread_mutex_lock(&lock->lock);
-
-        ++(lock->i);
-
-        pthread_mutex_unlock(&lock->i_lock);
-
-        return ret;
-}
-
-int rw_lock_wrlock(rw_lock_t * lock)
-{
-        int ret = 0;
-
-        if (lock == NULL)
-                return -1;
-
-        pthread_mutex_lock(&lock->i_lock);
-
-        if (lock->i < 0) {
-                pthread_mutex_unlock(&lock->i_lock);
-                return -1;
-        }
-
-        pthread_mutex_unlock(&lock->i_lock);
-
-        while (1) {
-                pthread_mutex_lock(&lock->i_lock);
-
-                if (lock->i == 0) {
-                        ++(lock->i);
-                        ret = pthread_mutex_lock(&lock->lock);
-                        pthread_mutex_unlock(&lock->i_lock);
-                        break;
-                }
-
-                pthread_mutex_unlock(&lock->i_lock);
-
-                sched_yield();
-        }
-
-        return ret;
-}
-
-int rw_lock_unlock(rw_lock_t * lock)
-{
-        int ret = 0;
-
-        if (lock == NULL)
-                return -1;
-
-        pthread_mutex_lock(&lock->i_lock);
-
-        if (lock->i < 0) {
-                pthread_mutex_unlock(&lock->i_lock);
-                return -1;
-        }
-
-        --(lock->i);
-
-        if (lock->i == 0)
-                ret = pthread_mutex_unlock(&lock->lock);
-
-        pthread_mutex_unlock(&lock->i_lock);
-
-        return ret;
-}
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 5f935d3f..f5909e11 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -36,7 +36,8 @@
 
 #define SHM_BLOCKS_SIZE (SHM_BLOCKS_IN_MAP * SHM_DU_BUFF_BLOCK_SIZE)
 #define SHM_FILE_SIZE (SHM_BLOCKS_SIZE + 2 * sizeof (size_t)                   \
-                       + sizeof(pthread_mutex_t)) + sizeof(pid_t)
+                       + sizeof(pthread_mutex_t) + sizeof(pthread_cond_t)      \
+                       + sizeof(pid_t))
 
 #define get_head_ptr(dum)                                                      \
 ((struct shm_du_buff *)(dum->shm_base + (*dum->ptr_head *                      \
@@ -73,6 +74,7 @@ struct shm_du_map {
         size_t *          ptr_head;    /* start of ringbuffer head */
         size_t *          ptr_tail;    /* start of ringbuffer tail */
         pthread_mutex_t * shm_mutex;   /* lock all free space in shm */
+        pthread_cond_t *  sanitize;    /* run sanitizer when buffer full */
         pid_t *           pid;         /* pid of the irmd owner */
         int               fd;
 };
@@ -82,7 +84,8 @@ struct shm_du_map * shm_du_map_create()
         struct shm_du_map * dum;
         int                 shm_fd;
         uint8_t *           shm_base;
-        pthread_mutexattr_t attr;
+        pthread_mutexattr_t mattr;
+        pthread_condattr_t  cattr;
 
         dum = malloc(sizeof *dum);
         if (dum == NULL) {
@@ -137,11 +140,17 @@ struct shm_du_map * shm_du_map_create()
                 ((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE);
         dum->ptr_tail = dum->ptr_head + 1;
         dum->shm_mutex = (pthread_mutex_t *) (dum->ptr_tail + 1);
-        dum->pid = (pid_t *) (dum->shm_mutex + 1);
+        dum->sanitize = (pthread_cond_t *) (dum->shm_mutex + 1);
+        dum->pid = (pid_t *) (dum->sanitize + 1);
 
-        pthread_mutexattr_init(&attr);
-        pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
-        pthread_mutex_init(dum->shm_mutex, &attr);
+        pthread_mutexattr_init(&mattr);
+        pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
+        pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
+        pthread_mutex_init(dum->shm_mutex, &mattr);
+
+        pthread_condattr_init(&cattr);
+        pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED);
+        pthread_cond_init(dum->sanitize, &cattr);
 
         *dum->ptr_head = 0;
         *dum->ptr_tail = 0;
@@ -193,7 +202,8 @@ struct shm_du_map * shm_du_map_open()
                 ((uint8_t *) dum->shm_base + SHM_BLOCKS_SIZE);
         dum->ptr_tail = dum->ptr_head + 1;
         dum->shm_mutex = (pthread_mutex_t *) (dum->ptr_tail + 1);
-        dum->pid = (pid_t *) (dum->shm_mutex + 1);
+        dum->sanitize = (pthread_cond_t *) (dum->shm_mutex + 1);
+        dum->pid = (pid_t *) (dum->sanitize + 1);
 
         dum->fd = shm_fd;
 
@@ -205,6 +215,12 @@ pid_t shm_du_map_owner(struct shm_du_map * dum)
         return *dum->pid;
 }
 
+void * shm_du_map_sanitize(void * o)
+{
+        LOG_MISSING;
+        return (void *) 0;
+}
+
 void shm_du_map_close(struct shm_du_map * dum)
 {
         if (dum == NULL) {
@@ -294,11 +310,13 @@ ssize_t shm_create_du_buff(struct shm_du_map * dum,
 
         if (!shm_map_free(dum, blocks)) {
                 pthread_mutex_unlock(dum->shm_mutex);
+                pthread_cond_signal(dum->sanitize);
                 return -1;
         }
 #else
         if (!shm_map_free(dum, 1)) {
                 pthread_mutex_unlock(dum->shm_mutex);
+                ptrhead_cond_signal(dum->sanitize);
                 return -1;
         }
 #endif