Making the library more thread aware. This is an attempt to be Cancel-safe

or at least cancel friendly.

@@ -21,13 +21,39 @@
 
 #include <errno.h>
 #include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_PTHREAD_H
+#  include <pthread.h>
+#endif
 
 #include <mailutils/registrar.h>
 #include <mailutils/iterator.h>
+#include <mailutils/list.h>
 
 #include <misc.h>
 #include <folder0.h>
 
+#ifdef WITH_PTHREAD
+static pthread_mutex_t slock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+/* Internal folder list.  */
+static list_t known_folder_list;
+static int is_known_folder (url_t, folder_t *);
+static int is_same_scheme (url_t, url_t);
+static int is_same_user (url_t, url_t);
+static int is_same_path (url_t, url_t);
+static int is_same_host (url_t, url_t);
+static int is_same_port (url_t, url_t);
+
+/*  A folder could be a remote one, IMAP, or local, a spool directory
+    like $HOME/Mail etc ..  We maintain a known list of folder to
+    not generate multiple folder of the same URL.  Meaning when
+    folder_create () is call we'll check if we already have a
+    folder for that URL and return the same, if not we create a new one.
+    The downside, the algo to detect the same URL is very weak, and
+    they maybe cases where you want a different folder for the same
+    URL, there is not easy way to do this.  */
 int
 folder_create (folder_t *pfolder, const char *name)
 {
@@ -41,7 +67,7 @@ folder_create (folder_t *pfolder, const char *name)
   if (pfolder == NULL)
     return EINVAL;
 
-  /* Look in the registrar, for a match  */
+  /* Look in the registrar list(iterator), for a match  */
   registrar_get_list (&list);
   status = iterator_create (&iterator, list);
   if (status != 0)
@@ -67,38 +93,63 @@ folder_create (folder_t *pfolder, const char *name)
       url_t url = NULL;
       folder_t folder = NULL;
 
-      /* Allocate memory for mbox.  */
-      folder = calloc (1, sizeof (*folder));
-      if (folder == NULL)
-        return ENOMEM;
-
-      /* Initialize the internal lock, now so the concrete mailbox
-         could use it. */
-      status = RWLOCK_INIT (&(folder->rwlock), NULL);
-      if (status != 0)
-        {
-          folder_destroy (&folder);
-          return status;
-        }
-
       /* Parse the url, it may be a bad one and we should bailout if this
-         failed.  */
-      if ((status = url_create (&url, name)) != 0
+	 failed.  */
+      if ((status = url_create (&url, name) != 0)
           || (status = entry->_url_init (url)) != 0)
-        {
-          folder_destroy (&folder);
-          return status;
-        }
-      folder->url = url;
+	return status;
 
-      /* Create the concrete folder type.  */
-      status = entry->_folder_init (folder);
-      if (status != 0)
-        {
-          folder_destroy (&folder);
-        }
+#ifdef WITH_PTHREAD
+      pthread_mutex_lock (&slock);
+#endif
+      /* Check if we already have the same URL folder.  */
+      if (is_known_folder (url, &folder))
+	{
+	  folder->ref++;
+	  *pfolder = folder;
+	  url_destroy (&url);
+#ifdef WITH_PTHREAD
+	  pthread_mutex_unlock (&slock);
+#endif
+	  return  0;
+	}
+#ifdef WITH_PTHREAD
       else
-        *pfolder = folder;
+	pthread_mutex_unlock (&slock);
+#endif
+
+      /* Create a new folder.  */
+
+      /* Allocate memory for folder.  */
+      folder = calloc (1, sizeof (*folder));
+      if (folder != NULL)
+	{
+	  folder->url = url;
+	  /* Initialize the internal lock, now so the concrete
+	     folder could use it.  */
+	  status = monitor_create (&(folder->monitor), folder);
+	  if (status == 0)
+	    {
+	      /* Create the concrete folder type.  */
+	      status = entry->_folder_init (folder);
+	      if (status == 0)
+		{
+		  *pfolder = folder;
+		  folder->ref++;
+		  /* Put on the internal list of known folders.  */
+		  list_append (known_folder_list, folder);
+		}
+	    }
+	  /* Something went wrong, destroy the object. */
+	  if (status != 0)
+	    {
+	      if (folder->monitor)
+		monitor_destroy (&(folder->monitor), folder);
+	      if (folder->url)
+		url_destroy (&(folder->url));
+	      free (folder);
+	    }
+	}
     }
   else
     status = ENOENT;
@@ -113,13 +164,26 @@ folder_destroy (folder_t *pfolder)
     {
       folder_t folder = *pfolder;
       int destroy_lock = 0;
+      monitor_t monitor = folder->monitor;
+      size_t reference;
+
+      monitor_wrlock (monitor);
 #ifdef WITH_PTHREAD
-      pthread_rwlock_t rwlock = folder->rwlock;
+      pthread_mutex_lock (&slock);
 #endif
-      RWLOCK_WRLOCK (&(rwlock));
-      if (folder_decremente (folder) == 0)
+      {
+	folder->ref--;
+	reference = folder->ref;
+	/* Remove the folder from the list of known folder.  */
+	if (reference == 0)
+	  list_remove (known_folder_list, folder);
+      }
+#ifdef WITH_PHTREAD
+      pthread_mutex_unlock (&slock);
+#endif
+      if (reference == 0)
 	{
-	  RWLOCK_UNLOCK (&(rwlock));
+	  monitor_unlock (monitor);
 	  destroy_lock = 1;
 	  /* Notify the observers.  */
 	  if (folder->observable)
@@ -129,7 +193,7 @@ folder_destroy (folder_t *pfolder)
 	    }
 	  if (folder->_destroy)
 	    folder->_destroy (folder);
-	  RWLOCK_WRLOCK (&(rwlock));
+	  monitor_wrlock (monitor);
 	  if (folder->ticket)
 	    ticket_destroy (&(folder->ticket), folder);
 	  if (folder->authority)
@@ -140,9 +204,9 @@ folder_destroy (folder_t *pfolder)
 	    url_destroy (&(folder->url));
 	  free (folder);
 	}
-      RWLOCK_UNLOCK (&(rwlock));
+      monitor_unlock (monitor);
       if (destroy_lock)
-	RWLOCK_DESTROY (&(rwlock));
+	monitor_destroy (&monitor, folder);
       *pfolder = NULL;
     }
 }
@@ -281,10 +345,144 @@ folder_delete_mailbox (folder_t folder, const char *name)
   return folder->_delete_mailbox (folder, name);
 }
 
-int
-folder_decremente (folder_t folder)
+static int is_known_folder (url_t url, folder_t *pfolder)
+{
+  int ret = 0;
+  folder_t folder = NULL;
+  iterator_t iterator;
+
+  if (url == NULL || pfolder == NULL)
+    return ret;
+
+  if (iterator_create (&iterator, known_folder_list) != 0)
+    return ret;
+
+  for (iterator_first (iterator); !iterator_is_done (iterator);
+       iterator_next (iterator))
+    {
+      iterator_current (iterator, (void **)&folder);
+      /* Check if the same URL type.  */
+      if (folder && folder->url
+	  && is_same_scheme (url, folder->url)
+	  && is_same_user (url, folder->url)
+	  && is_same_path (url, folder->url)
+	  && is_same_host (url, folder->url)
+	  && is_same_port (url, folder->url))
+	{
+	  ret = 1;
+	  break;
+	}
+    }
+  iterator_destroy (&iterator);
+  return ret;
+}
+
+static int
+is_same_scheme (url_t url1, url_t url2)
 {
-  if (folder && folder->_decremente)
-    return folder->_decremente (folder);
-  return (folder->ref--);
+  int i = 0, j = 0;
+  char *s1, *s2;
+  int ret = 1;
+
+  url_get_scheme (url1, NULL, 0, &i);
+  url_get_scheme (url2, NULL, 0, &j);
+  s1 = calloc (i + 1, sizeof (char));
+  if (s1)
+    {
+      url_get_scheme (url1, s1, i + 1, NULL);
+      s2 = calloc (j + 1, sizeof (char));
+      if (s2)
+	{
+	  url_get_scheme (url2, s2, j + 1, NULL);
+	  ret = !strcasecmp (s1, s2);
+	  free (s2);
+	}
+      free (s1);
+    }
+  return ret;
+}
+
+static int
+is_same_user (url_t url1, url_t url2)
+{
+  int i = 0, j = 0;
+  char *s1, *s2;
+  int ret = 0;
+
+  url_get_user (url1, NULL, 0, &i);
+  url_get_user (url2, NULL, 0, &j);
+  s1 = calloc (i + 1, sizeof (char));
+  if (s1)
+    {
+      url_get_user (url1, s1, i + 1, NULL);
+      s2 = calloc (j + 1, sizeof (char));
+      if (s2)
+	{
+	  url_get_user (url2, s2, j + 1, NULL);
+	  ret = !strcasecmp (s1, s2);
+	  free (s2);
+	}
+      free (s1);
+    }
+  return ret;
+}
+
+static int
+is_same_path (url_t url1, url_t url2)
+{
+  int i = 0, j = 0;
+  char *s1, *s2;
+  int ret = 0;
+
+  url_get_path (url1, NULL, 0, &i);
+  url_get_path (url2, NULL, 0, &j);
+  s1 = calloc (i + 1, sizeof (char));
+  if (s1)
+    {
+      url_get_path (url1, s1, i + 1, NULL);
+      s2 = calloc (j + 1, sizeof (char));
+      if (s2)
+	{
+	  url_get_path (url2, s2, j + 1, NULL);
+	  ret = !strcasecmp (s1, s2);
+	  free (s2);
+	}
+      free (s1);
+    }
+  return ret;
+}
+
+static int
+is_same_host (url_t url1, url_t url2)
+{
+  int i = 0, j = 0;
+  char *s1, *s2;
+  int ret = 0;
+
+  url_get_host (url1, NULL, 0, &i);
+  url_get_host (url2, NULL, 0, &j);
+  s1 = calloc (i + 1, sizeof (char));
+  if (s1)
+    {
+      url_get_host (url1, s1, i + 1, NULL);
+      s2 = calloc (j + 1, sizeof (char));
+      if (s2)
+	{
+	  url_get_host (url2, s2, j + 1, NULL);
+	  ret = !strcasecmp (s1, s2);
+	  free (s2);
+	}
+      free (s1);
+    }
+  return ret;
+}
+
+static int
+is_same_port (url_t url1, url_t url2)
+{
+  long p1 = 0, p2 = 0;
+
+  url_get_port (url1, &p1);
+  url_get_port (url2, &p2);
+  return (p1 == p2);
 }

@@ -22,14 +22,10 @@
 #  include <dmalloc.h>
 #endif
 
-#ifdef HAVE_PTHREAD_H
-#  define __USE_UNIX98 /* ?? */
-#  include <pthread.h>
-#endif
-
 #include <sys/types.h>
 #include <stdio.h>
 
+#include <mailutils/monitor.h>
 #include <mailutils/folder.h>
 
 #ifdef __cplusplus
@@ -52,15 +48,12 @@ struct _folder
   observable_t observable;
   debug_t debug;
   stream_t stream;
+  monitor_t monitor;
   url_t url;
   int flags;
   size_t ref;
   size_t uid;
 
-#ifdef WITH_PTHREAD
-  pthread_rwlock_t rwlock;
-#endif
-
   /* Back pointer to the specific mailbox */
   void *data;
 
@@ -73,13 +66,8 @@ struct _folder
   int  (*_close)           __P ((folder_t));
   int  (*_list)            __P ((folder_t, list_t *));
   int  (*_delete_mailbox)  __P ((folder_t, const char *));
-  int  (*_decremente)      __P ((folder_t));
 };
 
-/* To manipulate mailbox rwlock.  */
-extern int folder_rdlock         __P ((folder_t));
-extern int folder_wrlock         __P ((folder_t));
-extern int folder_unlock         __P ((folder_t));
 
 #ifdef __cplusplus
 }

@@ -22,13 +22,10 @@
 #  include <dmalloc.h>
 #endif
 
-#ifdef HAVE_PTHREAD_H
-#  define __USE_UNIX98 /* ?? */
-#  include <pthread.h>
-#endif
+#include <sys/types.h>
 
 #include <mailutils/list.h>
-#include <sys/types.h>
+#include <mailutils/monitor.h>
 
 
 #ifndef __P
@@ -54,9 +51,7 @@ struct _list
 {
   struct list_data head;
   size_t count;
-#ifdef WITH_PTHREAD
-  pthread_rwlock_t rwlock;
-#endif
+  monitor_t monitor;
 };
 
 

@@ -30,6 +30,7 @@
 #include <sys/types.h>
 #include <stdio.h>
 
+#include <mailutils/monitor.h>
 #include <mailutils/mailbox.h>
 #include <mailutils/folder.h>
 
@@ -57,10 +58,7 @@ struct _mailbox
   url_t url;
   folder_t folder;
   int flags;
-
-#ifdef WITH_PTHREAD
-  pthread_rwlock_t rwlock;
-#endif
+  monitor_t monitor;
 
   /* Back pointer to the specific mailbox */
   void *data;
@@ -86,11 +84,6 @@ struct _mailbox
 
 };
 
-/* To manipulate mailbox rwlock.  */
-extern int mailbox_rdlock         __P ((mailbox_t));
-extern int mailbox_wrlock         __P ((mailbox_t));
-extern int mailbox_unlock         __P ((mailbox_t));
-
 #define MAILBOX_NOTIFY(mbox, type) \
 if (mbox->observer) observer_notify (mbox->observer, type)
 

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, 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 Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _MONITOR0_H
+#define _MONITOR0_H
+
+#ifdef DMALLOC
+#  include <dmalloc.h>
+#endif
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <mailutils/monitor.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __P
+# if __STDC__
+#  define __P(x)  x
+# else
+#  define __P(x)
+# endif
+#endif
+
+#ifdef HAVE_PTHREAD_H
+#  define __USE_UNIX98
+#  include <pthread.h>
+#endif
+
+#ifdef WITH_PTHREAD
+#  if 0
+#    define RWLOCK_INIT(rwl, attr)  pthread_mutex_init (rwl, attr)
+#    define RWLOCK_DESTROY(rwl)     pthread_mutex_destroy (rwl)
+#    define RWLOCK_RDLOCK(rwl)      pthread_mutex_lock (rwl)
+#    define RWLOCK_TRYRDLOCK(rwl)   pthread_mutex_trylock (rwl)
+#    define RWLOCK_WRLOCK(rwl)      pthread_mutex_lock (rwl)
+#    define RWLOCK_TRYWRLOCK(rwl)   pthread_mutex_trylock (rwl)
+#    define RWLOCK_UNLOCK(rwl)      pthread_mutex_unlock (rwl)
+#  else
+#    define RWLOCK_INIT(rwl, attr)  pthread_rwlock_init (rwl, attr)
+#    define RWLOCK_DESTROY(rwl)     pthread_rwlock_destroy (rwl)
+#    define RWLOCK_RDLOCK(rwl)      pthread_rwlock_rdlock (rwl)
+#    define RWLOCK_TRYRDLOCK(rwl)   pthread_rwlock_tryrdlock (rwl)
+#    define RWLOCK_WRLOCK(rwl)      pthread_rwlock_wrlock (rwl)
+#    define RWLOCK_TRYWRLOCK(rwl)   pthread_rwlock_trywrlock (rwl)
+#    define RWLOCK_UNLOCK(rwl)      pthread_rwlock_unlock (rwl)
+#  endif
+#else
+#  define RWLOCK_INIT(rwl, attr)    0
+#  define RWLOCK_DESTROY(rwl)       0
+#  define RWLOCK_RDLOCK(rwl)        0
+#  define RWLOCK_TRYRDLOCK(rwl)     0
+#  define RWLOCK_WRLOCK(rwl)        0
+#  define RWLOCK_TRYWRLOCK(rwl)     0
+#  define RWLOCK_UNLOCK(rwl)        0
+#  define flockfile(arg)            0
+#  define funlockfile(arg)          0
+#endif
+
+struct _monitor
+{
+#ifdef WITH_PTHREAD
+  pthread_rwlock_t lock;
+#else
+  int lock;
+#endif
+  void *owner;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _MONITOR0_H */

@@ -22,7 +22,6 @@
 #include <errno.h>
 #include <stdlib.h>
 
-#include <misc.h>
 #include <list0.h>
 
 int
@@ -35,7 +34,7 @@ list_create (list_t *plist)
   list = calloc (sizeof (*list), 1);
   if (list == NULL)
     return ENOMEM;
-  status = RWLOCK_INIT (&(list->rwlock), NULL);
+  status = monitor_create (&(list->monitor), list);
   if (status != 0)
     {
       free (list);
@@ -55,15 +54,15 @@ list_destroy (list_t *plist)
       list_t list = *plist;
       struct list_data *current;
       struct list_data *previous;
-      RWLOCK_WRLOCK (&(list->rwlock));
+      monitor_wrlock (list->monitor);
       for (current = list->head.next; current != &(list->head);)
 	{
 	  previous = current;
 	  current = current->next;
 	  free (previous);
 	}
-      RWLOCK_UNLOCK (&(list->rwlock));
-      RWLOCK_DESTROY (&(list->rwlock));
+      monitor_unlock (list->monitor);
+      monitor_destroy (&(list->monitor), list);
       free (list);
       *plist = NULL;
     }
@@ -78,13 +77,13 @@ list_append (list_t list, void *item)
   if (ldata == NULL)
     return ENOMEM;
   ldata->item = item;
-  RWLOCK_WRLOCK (&(list->rwlock));
+  monitor_wrlock (list->monitor);
   ldata->next = &(list->head);
   ldata->prev = list->head.prev;
   last->next = ldata;
   list->head.prev = ldata;
   list->count++;
-  RWLOCK_UNLOCK (&(list->rwlock));
+  monitor_unlock (list->monitor);
   return 0;
 }
 
@@ -97,13 +96,13 @@ list_prepend (list_t list, void *item)
   if (ldata == NULL)
     return ENOMEM;
   ldata->item = item;
-  RWLOCK_WRLOCK (&(list->rwlock));
+  monitor_wrlock (list->monitor);
   ldata->prev = &(list->head);
   ldata->next = list->head.next;
   first->prev = ldata;
   list->head.next = ldata;
   list->count++;
-  RWLOCK_UNLOCK (&(list->rwlock));
+  monitor_unlock (list->monitor);
   return 0;
 }
 
@@ -130,7 +129,7 @@ list_remove (list_t list, void *item)
   struct list_data *current, *previous;
   if (list == NULL)
     return EINVAL;
-  RWLOCK_WRLOCK (&(list->rwlock));
+  monitor_wrlock (list->monitor);
   for (previous = &(list->head), current = list->head.next;
        current != &(list->head); previous = current, current = current->next)
     {
@@ -140,11 +139,11 @@ list_remove (list_t list, void *item)
 	  current->next->prev = previous;
 	  free (current);
 	  list->count--;
-	  RWLOCK_UNLOCK (&(list->rwlock));
+	  monitor_unlock (list->monitor);
 	  return 0;
 	}
     }
-  RWLOCK_UNLOCK (&(list->rwlock));
+  monitor_unlock (list->monitor);
   return ENOENT;
 }
 
@@ -155,17 +154,17 @@ list_get (list_t list, size_t index, void **pitem)
   size_t count;
   if (list == NULL || pitem == NULL)
     return EINVAL;
-  RWLOCK_RDLOCK (&(list->rwlock));
+  monitor_rdlock (list->monitor);
   for (current = list->head.next, count = 0; current != &(list->head);
        current = current->next, count++)
     {
       if (count == index)
         {
           *pitem = current->item;
-	  RWLOCK_UNLOCK (&(list->rwlock));
+	  monitor_unlock (list->monitor);
           return 0;
         }
     }
-  RWLOCK_UNLOCK (&(list->rwlock));
+  monitor_unlock (list->monitor);
   return ENOENT;
 }

@@ -22,10 +22,8 @@
 #include <stdlib.h>
 #include <errno.h>
 
-#include <mailutils/locker.h>
 #include <mailutils/iterator.h>
 #include <mailutils/registrar.h>
-#include <misc.h>
 #include <mailbox0.h>
 
 /* The Mailbox Factory.
@@ -77,9 +75,9 @@ mailbox_create (mailbox_t *pmbox, const char *name)
       if (mbox == NULL)
 	return ENOMEM;
 
-      /* Initialize the internal lock, now so the concrete mailbox
+      /* Initialize the internal lock now, so the concrete mailbox
 	 could use it. */
-      status = RWLOCK_INIT (&(mbox->rwlock), NULL);
+      status = monitor_create (&(mbox->monitor), mbox);
       if (status != 0)
 	{
 	  mailbox_destroy (&mbox);
@@ -117,9 +115,7 @@ mailbox_destroy (mailbox_t *pmbox)
   if (pmbox && *pmbox)
     {
       mailbox_t mbox = *pmbox;
-#ifdef WITH_PTHREAD
-      pthread_rwlock_t rwlock = mbox->rwlock;
-#endif
+      monitor_t monitor = mbox->monitor;
 
       /* Notify the observers.  */
       if (mbox->observable)
@@ -132,7 +128,7 @@ mailbox_destroy (mailbox_t *pmbox)
       if (mbox->_destroy)
 	mbox->_destroy (mbox);
 
-      RWLOCK_WRLOCK (&(rwlock));
+      monitor_wrlock (monitor);
 
       /* Nuke the stream and close it */
       if (mbox->stream)
@@ -161,8 +157,8 @@ mailbox_destroy (mailbox_t *pmbox)
 
       free (mbox);
       *pmbox = NULL;
-      RWLOCK_UNLOCK (&(rwlock));
-      RWLOCK_DESTROY (&(rwlock));
+      monitor_unlock (monitor);
+      monitor_destroy (&monitor, mbox);
     }
 }
 
@@ -317,7 +313,7 @@ mailbox_set_stream (mailbox_t mbox, stream_t stream)
 int
 mailbox_get_stream (mailbox_t mbox, stream_t *pstream)
 {
-  if (mbox == NULL || pstream == NULL)
+  if (mbox == NULL || pstream)
     return EINVAL;
   *pstream = mbox->stream;
   return 0;
@@ -364,42 +360,3 @@ mailbox_get_debug (mailbox_t mbox, debug_t *pdebug)
   *pdebug = mbox->debug;
   return 0;
 }
-
-/* Mailbox Internal Locks. Put the name of the functions in parenteses To make
-   sure it will not be redefine by a macro.  If the flags was non-blocking we
-   should not block on the lock, so we try with pthread_rwlock_try*lock().  */
-int
-(mailbox_rdlock) (mailbox_t mbox)
-{
-#ifdef WITH_PTHREAD
-  int err = (mbox->flags & MU_STREAM_NONBLOCK) ?
-    RWLOCK_TRYRDLOCK (&(mbox->rwlock)) :
-    RWLOCK_RDLOCK (&(mbox->rwlock)) ;
-  if (err != 0 && err != EDEADLK)
-    return err;
-#endif
-  return 0;
-}
-
-int
-(mailbox_wrlock) (mailbox_t mbox)
-{
-#ifdef WITH_PTHREAD
-  int err = (mbox->flags & MU_STREAM_NONBLOCK) ?
-    RWLOCK_TRYWRLOCK (&(mbox->rwlock)) :
-    RWLOCK_WRLOCK (&(mbox->rwlock)) ;
-  if (err != 0 && err != EDEADLK)
-    return err;
-#endif
-  return 0;
-}
-
-int
-(mailbox_unlock) (mailbox_t mbox)
-{
-#ifdef WITH_PTHREAD
-  return RWLOCK_UNLOCK (&(mbox->rwlock));
-#else
-  return 0;
-#endif
-}

@@ -191,17 +191,17 @@ do \
 do \
 { \
   int bailing = 0; \
-  mailbox_unlock (mbox); \
+  monitor_unlock (mbox->monitor); \
   if (mbox->observable) \
      bailing = observable_notify (mbox->observable, MU_EVT_MESSAGE_ADD); \
   if (bailing != 0) \
     { \
       if (pcount) \
         *pcount = (mud)->messages_count; \
-      mbox_unlock (mbox); \
+      locker_unlock (mbox->locker); \
       return EINTR; \
     } \
-  mailbox_wrlock (mbox); \
+  monitor_wrlock (mbox->monitor); \
 } while (0);
 
 /* Notification MBX_PROGRESS
@@ -215,7 +215,7 @@ do \
 { \
     { \
       int bailing = 0; \
-      mailbox_unlock (mbox); \
+      monitor_unlock (mbox->monitor); \
       mud->messages_count--; \
       if (mbox->observable) \
         bailing = observable_notify (mbox->observable, MU_EVT_MAILBOX_PROGRESS); \
@@ -223,11 +223,11 @@ do \
 	{ \
 	  if (pcount) \
 	    *pcount = (mud)->messages_count; \
-          mbox_unlock (mbox); \
+          locker_unlock (mbox->locker); \
 	  return EINTR; \
 	} \
       mud->messages_count++; \
-      mailbox_wrlock (mbox); \
+      monitor_wrlock (mbox->monitor); \
     } \
 } while (0)
 
@@ -243,16 +243,16 @@ do \
     m = realloc ((mud)->umessages, num * sizeof (*m)); \
     if (m == NULL) \
       { \
-        mbox_unlock (mbox); \
-        mailbox_unlock (mbox); \
+        locker_unlock (mbox->locker); \
+        monitor_unlock (mbox->monitor); \
         return ENOMEM; \
       } \
     (mud)->umessages = m; \
     (mud)->umessages[num - 1] = calloc (1, sizeof (*(mum))); \
     if ((mud)->umessages[num - 1] == NULL) \
       { \
-        mbox_unlock (mbox); \
-        mailbox_unlock (mbox); \
+        locker_unlock (mbox->locker); \
+        monitor_unlock (mbox->monitor); \
         return ENOMEM; \
       } \
     (mud)->umessages_count = num; \
@@ -282,17 +282,23 @@ mbox_scan0 (mailbox_t mailbox, size_t msgno, size_t *pcount, int do_notif)
     return EINVAL;
 
   /* Grab the lock.  */
-  mailbox_wrlock (mailbox);
+  monitor_wrlock (mailbox->monitor);
+
+#ifdef WITH_PTHREAD
+  /* read() is cancellation point since we're doing a potentially
+     long operation.  Lets make sure we clean the state.  */
+  pthread_cleanup_push (mbox_cleanup, (void *)mailbox);
+#endif
 
   /* Save the timestamp and size.  */
   status = stream_size (mailbox->stream, &(mud->size));
   if (status != 0)
     {
-      mailbox_unlock (mailbox);
+      monitor_unlock (mailbox->monitor);
       return status;
     }
 
-  mbox_lock (mailbox, MU_LOCKER_RDLOCK);
+  locker_lock (mailbox->locker, MU_LOCKER_RDLOCK);
 
   /* Seek to the starting point.  */
   if (mud->umessages && msgno > 0 && mud->messages_count > 0
@@ -376,7 +382,7 @@ mbox_scan0 (mailbox_t mailbox, size_t msgno, size_t *pcount, int do_notif)
 
       /* Every 50 mesgs update the lock, it should be every minute.  */
       if ((mud->messages_count % 50) == 0)
-	mbox_touchlock (mailbox);
+	locker_touchlock (mailbox->locker);
 
       /* Ping them every 1000 lines.  */
       if (do_notif)
@@ -392,9 +398,13 @@ mbox_scan0 (mailbox_t mailbox, size_t msgno, size_t *pcount, int do_notif)
       if (do_notif)
 	DISPATCH_ADD_MSG(mailbox, mud);
     }
-  mbox_unlock (mailbox);
   if (pcount)
     *pcount = mud->messages_count;
-  mailbox_unlock (mailbox);
+  locker_unlock (mailbox->locker);
+  monitor_unlock (mailbox->monitor);
+
+#ifdef WITH_PTHREAD
+  pthread_cleanup_pop (0);
+#endif
   return status;
 }

@@ -189,7 +189,7 @@ struct _pop_data
 #define CHECK_BUSY(mbox, mpd, function, identity) \
 do \
   { \
-    int err = mailbox_wrlock (mbox); \
+    int err = monitor_wrlock (mbox->monitor); \
     if (err != 0) \
       return err; \
     if ((mpd->func && mpd->func != function) \
@@ -198,7 +198,7 @@ do \
         mpd->id = 0; \
         mpd->func = pop_open; \
         mpd->state = POP_NO_STATE; \
-        mailbox_unlock (mbox); \
+        monitor_unlock (mbox->monitor); \
         err = pop_open (mbox, mbox->flags); \
         if (err != 0) \
           { \
@@ -209,7 +209,7 @@ do \
       { \
         mpd->id = (size_t)identity; \
         mpd->func = func; \
-        mailbox_unlock (mbox); \
+        monitor_unlock (mbox->monitor); \
       } \
   } \
 while (0)
@@ -301,7 +301,7 @@ pop_destroy (mailbox_t mbox)
     {
       pop_data_t mpd = mbox->data;
       size_t i;
-      mailbox_wrlock (mbox);
+      monitor_wrlock (mbox->monitor);
       /* Destroy the pop messages and ressources associated to them.  */
       for (i = 0; i < mpd->pmessages_count; i++)
 	{
@@ -320,7 +320,7 @@ pop_destroy (mailbox_t mbox)
 	free (mpd->pmessages);
       free (mpd);
       mbox->data = NULL;
-      mailbox_unlock (mbox);
+      monitor_unlock (mbox->monitor);
     }
 }
 
@@ -545,12 +545,12 @@ pop_close (mailbox_t mbox)
     return EINVAL;
 
   /* CHECK_BUSY (mbox, mpd, func, 0); */
-  mailbox_wrlock (mbox);
+  monitor_wrlock (mbox->monitor);
   if (mpd->func && mpd->func != func)
     mpd->state = POP_NO_STATE;
   mpd->id = 0;
   mpd->func = func;
-  mailbox_unlock (mbox);
+  monitor_unlock (mbox->monitor);
 
   /*  Ok boys, it's a wrap: UPDATE State.  */
   switch (mpd->state)
@@ -625,7 +625,7 @@ pop_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
   if (pmsg == NULL || mpd == NULL)
     return EINVAL;
 
-  mailbox_rdlock (mbox);
+  monitor_rdlock (mbox->monitor);
   /* See if we have already this message.  */
   for (i = 0; i < mpd->pmessages_count; i++)
     {
@@ -634,12 +634,12 @@ pop_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
 	  if (mpd->pmessages[i]->num == msgno)
 	    {
 	      *pmsg = mpd->pmessages[i]->message;
-	      mailbox_unlock (mbox);
+	      monitor_unlock (mbox->monitor);
 	      return 0;
 	    }
 	}
     }
-  mailbox_unlock (mbox);
+  monitor_unlock (mbox->monitor);
 
   mpm = calloc (1, sizeof (*mpm));
   if (mpm == NULL)
@@ -724,7 +724,7 @@ pop_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
   message_set_uidl (msg, pop_uidl, mpm);
 
   /* Add it to the list.  */
-  mailbox_wrlock (mbox);
+  monitor_wrlock (mbox->monitor);
   {
     pop_message_t *m ;
     m = realloc (mpd->pmessages, (mpd->pmessages_count + 1)*sizeof (*m));
@@ -732,14 +732,14 @@ pop_get_message (mailbox_t mbox, size_t msgno, message_t *pmsg)
       {
 	message_destroy (&msg, mpm);
 	free (mpm);
-	mailbox_unlock (mbox);
+	monitor_unlock (mbox->monitor);
 	return ENOMEM;
       }
     mpd->pmessages = m;
     mpd->pmessages[mpd->pmessages_count] = mpm;
     mpd->pmessages_count++;
   }
-  mailbox_unlock (mbox);
+  monitor_unlock (mbox->monitor);
 
   /* Save The message.  */
   *pmsg = mpm->message = msg;

@@ -21,6 +21,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
+#include <unistd.h>
+#include <time.h>
 
 #include <mailutils/message.h>
 #include <mailutils/stream.h>
@@ -371,7 +373,7 @@ static int _mime_set_content_type(mime_t mime)
 	char boundary[128];
 	header_t	hdr = NULL;
 	size_t		size;
-	
+
 	if ( mime->nmtp_parts > 1 ) {
 		if ( mime->flags & MIME_ADDED_MULTIPART_CT )
 			return 0;
@@ -453,7 +455,7 @@ static int _mime_body_read(stream_t stream, char *buf, size_t buflen, off_t off,
 					}
 					while(mime->postamble) {
 						mime->postamble--;
-						ADD_CHAR(buf, '-', mime->cur_offset, buflen, *nbytes);						
+						ADD_CHAR(buf, '-', mime->cur_offset, buflen, *nbytes);
 					}
 					mime->flags &= ~(MIME_INSERT_BOUNDARY|MIME_ADDING_BOUNDARY);
 					mime->part_offset = 0;
@@ -463,9 +465,9 @@ static int _mime_body_read(stream_t stream, char *buf, size_t buflen, off_t off,
 				   return 0;
 				message_get_stream(mime->mtp_parts[mime->cur_part]->msg, &msg_stream);
 			} else {
-				body_t body;
-				message_get_body(mime->mtp_parts[mime->cur_part]->msg, &body);
-				body_get_stream(body, &msg_stream);
+				body_t b;
+				message_get_body(mime->mtp_parts[mime->cur_part]->msg, &b);
+				body_get_stream(b, &msg_stream);
 			}
 			ret = stream_read(msg_stream, buf, buflen, mime->part_offset, &part_nbytes );
     		len += part_nbytes;
@@ -673,7 +675,7 @@ int mime_get_num_parts(mime_t mime, int *nmtp_parts)
 int mime_add_part(mime_t mime, message_t msg)
 {
 	int ret;
-	
+
 	if ( mime == NULL || msg == NULL || ( mime->flags & MIME_NEW_MESSAGE ) == 0 )
 		return EINVAL;
 	if ( ( ret = _mime_append_part(mime, msg, 0, 0, 0) ) == 0 )

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, 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 Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <monitor0.h>
+
+int
+monitor_create (monitor_t *pmonitor, void *owner)
+{
+  monitor_t monitor;
+  int status = 0;
+  if (pmonitor == NULL)
+    return EINVAL;
+  monitor = calloc (1, sizeof (*monitor));
+  if (monitor == NULL)
+    return ENOMEM;
+  monitor->owner = owner;
+  status = RWLOCK_INIT (&(monitor->lock), NULL);
+  if (status == 0)
+    {
+      free (monitor);
+      return status;
+    }
+  *pmonitor = monitor;
+  return status;
+}
+
+void *
+monitor_get_owner (monitor_t monitor)
+{
+  return (monitor == NULL) ? NULL : monitor->owner;
+}
+
+void
+monitor_destroy (monitor_t *pmonitor, void *owner)
+{
+  if (pmonitor && *pmonitor)
+    {
+      monitor_t monitor = *pmonitor;
+      if (monitor->owner == owner)
+	{
+	  RWLOCK_DESTROY (&(monitor->lock));
+	}
+      free (monitor);
+      *pmonitor = NULL;
+    }
+}
+
+int
+monitor_rdlock (monitor_t monitor)
+{
+  if (monitor)
+    {
+      return RWLOCK_RDLOCK (&(monitor->lock));
+    }
+  return 0;
+}
+
+int
+monitor_wrlock  (monitor_t monitor)
+{
+  if (monitor)
+    {
+      return RWLOCK_WRLOCK (&(monitor->lock));
+    }
+  return 0;
+}
+
+int
+monitor_unlock (monitor_t monitor)
+{
+  if (monitor)
+    {
+      return RWLOCK_UNLOCK (&(monitor->lock));
+    }
+  return 0;
+}
+
+int
+monitor_wait (monitor_t monitor)
+{
+  (void)monitor;
+  return ENOSYS;
+}
+
+int
+monitor_notify (monitor_t monitor)
+{
+  (void)monitor;
+  return ENOSYS;
+}