Merged revisions 111049 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r111049 | mmichelson | 2008-03-26 14:22:16 -0500 (Wed, 26 Mar 2008) | 9 lines

Add a lock to the vm_state structure and use the lock around mail_open calls
to prevent concurrent access of the same mailstream. This, along with trunk's
ability to configure TCP timeouts for IMAP storage will help to prevent
crashes and hangs when using voicemail with IMAP storage.

(closes issue #10487)
Reported by: ewilhelmsen


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@111067 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -416,6 +416,7 @@ struct vm_state {
 	int starting;
 	int repeats;
 #ifdef IMAP_STORAGE
+	ast_mutex_t lock;
 	int updated;                         /*!< decremented on each mail check until 1 -allows delay */
 	long msgArray[256];
 	MAILSTREAM *mailstream;
@@ -5042,7 +5043,9 @@ static int init_mailstream(struct vm_state *vms, int box)
 #endif
 		/* Connect to mailbox to get mailstream so we can get delimiter */ 
 		imap_mailbox_name(tmp, sizeof(tmp), vms, 0, 1);
+		ast_mutex_lock(&vms->lock);
 		stream = mail_open (stream, tmp, debug ? OP_DEBUG : NIL);
+		ast_mutex_unlock(&vms->lock);
 		if (stream == NIL) {
 			ast_log(LOG_ERROR, "Can't connect to imap server %s\n", tmp);
 			return -1;
@@ -5057,7 +5060,9 @@ static int init_mailstream(struct vm_state *vms, int box)
 	/* Now connect to the target folder */
 	imap_mailbox_name(tmp, sizeof(tmp), vms, box, 1);
 	ast_debug(3, "Before mail_open, server: %s, box:%d\n", tmp, box);
-	vms->mailstream = mail_open(stream, tmp, debug ? OP_DEBUG : NIL);
+	ast_mutex_lock(&vms->lock);
+	vms->mailstream = mail_open (stream, tmp, debug ? OP_DEBUG : NIL);
+	ast_mutex_unlock(&vms->lock);
 	if (vms->mailstream == NIL) {
 		return -1;
 	} else {
@@ -9793,8 +9798,10 @@ static void vmstate_delete(struct vm_state *vms)
 	AST_LIST_TRAVERSE_SAFE_END
 	AST_LIST_UNLOCK(&vmstates);
 	
-	if (vc)
+	if (vc) {
+		ast_mutex_destroy(&vms->lock);
 		ast_free(vc);
+	}
 	else
 		ast_log(LOG_ERROR, "No vmstate found for user:%s, mailbox %s\n", vms->imapuser, vms->username);
 }
@@ -9823,6 +9830,7 @@ static void init_vm_state(struct vm_state *vms)
 	for (x = 0; x < 256; x++) {
 		vms->msgArray[x] = 0;
 	}
+	ast_mutex_init(&vms->lock);
 }
 
 static void check_msgArray(struct vm_state *vms)