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  • How to get information about e-mails in Mail.app

    - by Dann
    Hi, If a user is reading e-mails in Mail.app and closes this application and opens my application .I want to show the information about the mail read by the user. Is there some way to get information about the email (in Mail.app), so that I use it in my application. Thanks.

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  • Mail php function does'nt send the email

    - by Mamadou
    Hello everybody, I have the following code wich work on some server and does not work in an other: $Name = "myname"; //senders name $email_sender = "[email protected]"; //senders e-mail adress $recipient = $email; //recipient $mail_body = "The text for the mail..."; //mail body $subject = "Subject for reviever"; //subject $header = "From: ". $Name . " <" . $email_sender . ">\r\n"; $status = mail($recipient, $subject, $mail_body, $header); print('ENVOI '. $status); the $status variable is true but i dont see any email.

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  • Postfix Stagger/Rate Limit Outbound Mail

    - by GruffTech
    We have a server that sends our weekly newsletter to subscribers, To prevent people like Hotmail or Yahoo from blocking us due to sending too many simultaneous emails to them, Is there a way we can stagger email, or rate-limit outbound emails from postfix? Keep in mind, I dont want the mailserver to stop queueing mail or accepting new messages, Simply defer delivery if there are more then 3-4 messages per destination domain/ipaddress, or something similar. Note: I dont want a Sender Throttle, as described in a similar question, here. I'm looking more for a recipient throttle but haven't had any luck finding out how to do so with PolicyD or Anvil services, and was wondering if anyone else has accomplished such a task.

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  • os x 10.4 server enable mail for account via terminal

    - by Chris
    Hello- I have an account on an OS X 10.4 server that I don't have physical access to (must use SSH). For arguments sake, let's call the account 'Bob'. Bob's account exists and appears to be fully functional, however he does not have email. How do I enable, via terminal, email for Bob's account, such that he can receive email at [email protected]? I already have the mail server all set up with several working accounts in it, I just need to add Bob. I have searched all over Google for over six hours now, but can't seem to find an answer that fits my situation. Any help is appreciated. P.S. - I am not adverse to just deleting the account and starting over, if that would make things easier...

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  • Windows Live Mail treating my Firefox as mobile device

    - by Mussnoon
    I started using Namoroka (firefox 3.6 nighly) yesterday and since then, windows live mail has been treating it like a mobile device. Same thing happens when I try with Minefield (firefox 4 nightly). I've tried loading the default page in Chromium and then pasting the URL to firefox. The sign in page shows alright then, but as soon as I sign in, the mobile inbox shows up again. I've tried clearing the cache+history+cookies everything but nothing's working. Anyone know of a solution?

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  • ubuntu: sending mail with postfix?

    - by ajsie
    i've got some questions about how it works: so ubuntu server comes with postfix installed. if i want my php script to send a mail to lets say [email protected], how does it work? do i have to specify any ip to another MTA (my ISP's MTA?) in postfix's configuration file? and if someone sends back, will it get to my ip? is it postfix that receives it? or has it to do with fetchmail?

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  • Unable to open attachment in Windows Live Mail 2011 (Build 15.4.3502.0922)

    - by Anon2010
    I use Windows Live Mail 2011 (Build 15.4.3502.0922), in Windows 7 Pro 64. When I receive an email message that has an attachment, when I double click to open this attachment, nothing happens. Any kind of attachment, nothing happens. If I right click and choose "Open", nothing happens either. If I right click and choose Save As, I can save the file to disk and open it via Windows Explorer. I would like to be able to double click to open the attachment. I tried to repair WLM but that didn't make any difference. My antivirus is Microsoft Security Essentials. Does anyone know anything about this issue? Thanks

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  • Work around for yahoo mail slowness (using 100% cpu)

    - by Tony Lee
    My yahoo mail is very slow sometimes. When it is, I notice that IE8 is using 100% cpu. Using sysinternals process explorer I discovered the thread using all the cpu in IE8 has Flash in the stackwalk. I upgraded flash from 9 to 10, but the problem persists. I'm about to edit hosts to block the flash content by redirecting the yahoo and ad click dns entries. Is there some easier way to get flash to behave? The fix for the long run will be switching to gmail.

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  • Find edited Word attachment opened via Windows Mail (Vista)

    - by Tony Meyer
    If you open (not save) a Word attachment in Windows Mail, then it will open the document up in Microsoft Word. This is saved somewhere, and you can edit the file and save it (i.e. no "save as" dialog appears). If you then close Word without explicitly saving the file somewhere, how do you then find the edited file? (Assuming that it can be found, and isn't automatically deleted). Windows Search does not find the file (presumably because it's in the folders that are excluded from search).

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  • How Often do You Change E-mail Addresses? [Poll]

    - by Asian Angel
    Recently we ran across an article about a man who consistently changes his e-mail address every 20 months. Why? To throw off spam. With that in mind we became curious and decided to ask how often you change your e-mail addresses… Everyone has their own method for dealing with the bane known as spam whether it is heavy filtering, separate accounts to catch possible spam activity, abandoning swamped accounts, etc. Here is your opportunity to share how you deal with spam, protect your accounts, and to voice your thoughts regarding consistent timed changes to new accounts as mentioned in the article linked to below. How-To Geek Polls require Javascript. Please Click Here to View the Poll. How Frequently Do You Change Your Email Address? [Apartment Therapy] 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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  • Colour table cells in Microsoft Word after mail merge

    - by James
    I have an Excel spreadsheet of student data. For each of 30 topics, students are traffic lighted R, A or G (for red, amber, green) in the spreadsheet. I am mail merging individual result print-outs in Word 2010. However, rather than printing the letter R/A/G next to each topic, I would rather change the background colour of the cell to that colour. How can I do this? Is there an option with merge fields or can it be done with a macro (please provide sample code if so - I don't have experience with macros!)

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  • Setup mail server on VPS?

    - by user41010
    This is a n00b question, sorry. I have a site running on a VPS, now I want to be able to receive mails at [email protected]. How do I need to set up the server? And how should I set up the mail client on my PC to receive those mails? The server is running CentOS/RHEL. I'll really appreciate if someone shed some light on the steps that need to be taken. It will be really helpful. Thanks in advance!

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  • Forwarding sent mail through postfix

    - by D_f-r
    So I've successfully forwarded mail from my postfix server to remote Gmail accounts using /etc/aliases and newaliases. But now of course those Gmail accounts cannot send email originating from the original, aliased addresses without further configuration. I examined the Gmail configuration and found that it is indeed possible to forward sent emails via SMTP through the postfix server, but an account with a password is necessary. Even though those accounts are simply aliases, is it possible to give them passwords to facilitate replying to emails they forward? Or is an entirely different configuration set-up necessary?

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  • Postfix mail server: can't connect via POP/IMAP

    - by MelkerOVan
    I've followed this guide on setting up a mail server on my dedicated server. I've been able to send mails from the php application I'm using and the linux commandline (using telnet, php, etc). The problem is that I cannot connect to the server via IMAP/POP which I've setup using Courier. I've tried using thunderbird but it complains that the username or password is wrong. I doubt it is the username/password but I don't know how to trouble shoot this. Edit: Here's the messages in mail.log: Jan 9 22:43:38 mail authdaemond: received auth request, service=imap, authtype=login Jan 9 22:43:38 mail authdaemond: authmysql: trying this module Jan 9 22:43:38 mail authdaemond: SQL query: SELECT id, crypt, "", uid, gid, home, "", "", name, "" FROM users WHERE id = '[email protected]' AND (enabled=1) Jan 9 22:43:38 mail authdaemond: password matches successfully Jan 9 22:43:38 mail authdaemond: authmysql: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: authmysql: clearpasswd=<null>, passwd=6SrBcYq65l8QU Jan 9 22:43:38 mail authdaemond: Authenticated: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: Authenticated: clearpasswd=peter, passwd=6SrBcYq65l8QU Jan 9 22:43:38 mail imapd: chdir Maildir: No such file or directory

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  • Mail server: can't connect via POP/IMAP

    - by MelkerOVan
    I've followed this guide on setting up a mail server on my dedicated server. I've been able to send mails from the php application I'm using and the linux commandline (using telnet, php, etc). The problem is that I cannot connect to the server via IMAP/POP which I've setup using Courier. I've tried using thunderbird but it complains that the username or password is wrong. I doubt it is the username/password but I don't know how to trouble shoot this. Edit: Here's the messages in mail.log: Jan 9 22:43:38 mail authdaemond: received auth request, service=imap, authtype=login Jan 9 22:43:38 mail authdaemond: authmysql: trying this module Jan 9 22:43:38 mail authdaemond: SQL query: SELECT id, crypt, "", uid, gid, home, "", "", name, "" FROM users WHERE id = '[email protected]' AND (enabled=1) Jan 9 22:43:38 mail authdaemond: password matches successfully Jan 9 22:43:38 mail authdaemond: authmysql: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: authmysql: clearpasswd=<null>, passwd=password Jan 9 22:43:38 mail authdaemond: Authenticated: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: Authenticated: clearpasswd=peter, passwd=password Jan 9 22:43:38 mail imapd: chdir Maildir: No such file or directory

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  • Job queue manager with RPC interface

    - by admr
    I need a job queue manager that I can control over the Internet. It should be able to execute and stop processes, check on their status (ideally notice and execute some code when a process exits), respond to commands and also be able to report back to a server. Background: I have a GWT application that allows to create jobs to execute on a cloud instance (currently EC2). I want to push a "job packet" (data for a process to operate on etc) to S3, start a Linux EC2 instance (or use one that's already running), and tell a job manager on the instance to execute that job (possibly parallel to other jobs). It should then pull the "job packet" from S3, run a process that operates on that data and report back to the server that is running the server part of my GWT application with some information (e.g. exit code, stdout, stderr). If I have to write e.g. stdour/err to a file from the process and read that file, that's OK too. I would really like the manager to be "close" to the processes it runs, meaning I want to avoid using something like Runtime.exec from the JDK. It seems like I would have to do that if I used Quartz for example. I'm fine with the calls in both directions being asynchronous. I'm fine with any reasonable technology for the calls as long as I can easily build an interface for that in my GWT server side (e.g. HTTP requests to a servlet over SSL would be nice and trivial). The job manager does not need to have a very sophisticated queueing system. Running several processes either sequentially or in parallel should be fine. Determining how much compute time a process received during its lifetime would be nice (AFAIK, this might be challenging). I did not yet find any existing software that does this, including http://java-source.net/open-source/job-schedulers. I suspect I might have to build an RPC interface (with authentication etc, of course) around a job manager; maybe use something like Apache Commons Exec. In that case, I would prefer Java or Python for the job manager part. I would be happy to hear suggestions for either the former or latter scenario!

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  • Go - Using a container/heap to implement a priority queue

    - by Seth Hoenig
    In the big picture, I'm trying to implement Dijkstra's algorithm using a priority queue. According to members of golang-nuts, the idiomatic way to do this in Go is to use the heap interface with a custom underlying data structure. So I have created Node.go and PQueue.go like so: //Node.go package pqueue type Node struct { row int col int myVal int sumVal int } func (n *Node) Init(r, c, mv, sv int) { n.row = r n.col = c n.myVal = mv n.sumVal = sv } func (n *Node) Equals(o *Node) bool { return n.row == o.row && n.col == o.col } And PQueue.go: // PQueue.go package pqueue import "container/vector" import "container/heap" type PQueue struct { data vector.Vector size int } func (pq *PQueue) Init() { heap.Init(pq) } func (pq *PQueue) IsEmpty() bool { return pq.size == 0 } func (pq *PQueue) Push(i interface{}) { heap.Push(pq, i) pq.size++ } func (pq *PQueue) Pop() interface{} { pq.size-- return heap.Pop(pq) } func (pq *PQueue) Len() int { return pq.size } func (pq *PQueue) Less(i, j int) bool { I := pq.data.At(i).(Node) J := pq.data.At(j).(Node) return (I.sumVal + I.myVal) < (J.sumVal + J.myVal) } func (pq *PQueue) Swap(i, j int) { temp := pq.data.At(i).(Node) pq.data.Set(i, pq.data.At(j).(Node)) pq.data.Set(j, temp) } And main.go: (the action is in SolveMatrix) // Euler 81 package main import "fmt" import "io/ioutil" import "strings" import "strconv" import "./pqueue" const MATSIZE = 5 const MATNAME = "matrix_small.txt" func main() { var matrix [MATSIZE][MATSIZE]int contents, err := ioutil.ReadFile(MATNAME) if err != nil { panic("FILE IO ERROR!") } inFileStr := string(contents) byrows := strings.Split(inFileStr, "\n", -1) for row := 0; row < MATSIZE; row++ { byrows[row] = (byrows[row])[0 : len(byrows[row])-1] bycols := strings.Split(byrows[row], ",", -1) for col := 0; col < MATSIZE; col++ { matrix[row][col], _ = strconv.Atoi(bycols[col]) } } PrintMatrix(matrix) sum, len := SolveMatrix(matrix) fmt.Printf("len: %d, sum: %d\n", len, sum) } func PrintMatrix(mat [MATSIZE][MATSIZE]int) { for r := 0; r < MATSIZE; r++ { for c := 0; c < MATSIZE; c++ { fmt.Printf("%d ", mat[r][c]) } fmt.Print("\n") } } func SolveMatrix(mat [MATSIZE][MATSIZE]int) (int, int) { var PQ pqueue.PQueue var firstNode pqueue.Node var endNode pqueue.Node msm1 := MATSIZE - 1 firstNode.Init(0, 0, mat[0][0], 0) endNode.Init(msm1, msm1, mat[msm1][msm1], 0) if PQ.IsEmpty() { // make compiler stfu about unused variable fmt.Print("empty") } PQ.Push(firstNode) // problem return 0, 0 } The problem is, upon compiling i get the error message: [~/Code/Euler/81] $ make 6g -o pqueue.6 Node.go PQueue.go 6g main.go main.go:58: implicit assignment of unexported field 'row' of pqueue.Node in function argument make: *** [all] Error 1 And commenting out the line PQ.Push(firstNode) does satisfy the compiler. But I don't understand why I'm getting the error message in the first place. Push doesn't modify the argument in any way.

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  • Sendmail Issue - Local Mail / Inner Domain Mail

    - by ngl5000
    Environments: Ubuntu / Sendmail / Google Apps Emailing: I send and receive all of my emails through google apps besides emails that are sent directly from my website. My Web Domain: example.com (for the purpose of the question only) Problem: When my website sends an email, using sendmail, to any local address ([email protected]) I get an unknown user error. Emails sent to other domains seem to work just fine. Question: I believe this is because I don't have these users defined on my ubuntu server, this is besides the point I need to configure sendmail such that it doesn't pick out local emails sent to ([email protected]) and instead finds their name server which points to google apps and sends it there instead. This is my first try at serverfault, I normally use stackoverflow so let me know if I'm messing up! Thank you!

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  • Postfix configuration - Uing virtual min but server is bouncing back my mail.

    - by brodiebrodie
    I have no experience in setting up postfix, and thought virtualmin minght do the legwork for me. Appears not. When I try to send mail to the domain (either [email protected] [email protected] or [email protected]) I get the following message returned This is the mail system at host dedq239.localdomain. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <[email protected]> (expanded from <[email protected]>): User unknown in virtual alias table Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 5.0.0 Diagnostic-Code: X-Postfix; User unknown in virtual alias table How can I diagnose the problem here? It seems that the mail gets to my server but the server fails to locally deliver the message to the correct user. (This is a guess, truthfully I have no idea what is happening). I have checked my virtual alias table and it seems to be set up correctly (I can post if this would be helpful). Can anyone give me a clue as to the next step? Thanks alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 html_directory = no local_recipient_maps = $virtual_mailbox_maps mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination smtpd_sasl_auth_enable = yes soft_bounce = no unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual My mail log file (the last entry) Sep 30 15:13:47 dedq239 postfix/cleanup[7237]: 207C6B18158: message-id=<[email protected]> Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 207C6B18158: from=<[email protected]>, size=1805, nrcpt=1 (queue active) Sep 30 15:13:47 dedq239 postfix/error[7238]: 207C6B18158: to=<[email protected]>, orig_to=<[email protected]>, relay=none, delay=0.64, delays=0.61/0.01/0/0.02, dsn=5.0.0, status=bounced (User unknown in virtual alias table) Sep 30 15:13:47 dedq239 postfix/cleanup[7237]: 8DC13B18169: message-id=<[email protected]> Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 8DC13B18169: from=<>, size=3691, nrcpt=1 (queue active) Sep 30 15:13:47 dedq239 postfix/bounce[7239]: 207C6B18158: sender non-delivery notification: 8DC13B18169 Sep 30 15:13:47 dedq239 postfix/qmgr[7177]: 207C6B18158: removed Sep 30 15:13:48 dedq239 postfix/smtp[7240]: 8DC13B18169: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[209.85.216.55]:25, delay=1.3, delays=0.02/0.01/0.58/0.75, dsn=2.0.0, status=sent (250 2.0.0 OK 1254348828 36si15082901pxi.91) Sep 30 15:13:48 dedq239 postfix/qmgr[7177]: 8DC13B18169: removed Sep 30 15:14:17 dedq239 postfix/smtpd[7233]: disconnect from mail-bw0-f228.google.com[209.85.218.228] etc.aliases file below I have not touched this file - myvirtualdomain is a replacement for my real domain name # Aliases in this file will NOT be expanded in the header from # Mail, but WILL be visible over networks or from /bin/mail. # # >>>>>>>>>> The program "newaliases" must be run after # >> NOTE >> this file is updated for any changes to # >>>>>>>>>> show through to sendmail. # # Basic system aliases -- these MUST be present. mailer-daemon: postmaster postmaster: root # General redirections for pseudo accounts. bin: root daemon: root adm: root lp: root sync: root shutdown: root halt: root mail: root news: root uucp: root operator: root games: root gopher: root ftp: root nobody: root radiusd: root nut: root dbus: root vcsa: root canna: root wnn: root rpm: root nscd: root pcap: root apache: root webalizer: root dovecot: root fax: root quagga: root radvd: root pvm: root amanda: root privoxy: root ident: root named: root xfs: root gdm: root mailnull: root postgres: root sshd: root smmsp: root postfix: root netdump: root ldap: root squid: root ntp: root mysql: root desktop: root rpcuser: root rpc: root nfsnobody: root ingres: root system: root toor: root manager: root dumper: root abuse: root newsadm: news newsadmin: news usenet: news ftpadm: ftp ftpadmin: ftp ftp-adm: ftp ftp-admin: ftp www: webmaster webmaster: root noc: root security: root hostmaster: root info: postmaster marketing: postmaster sales: postmaster support: postmaster # trap decode to catch security attacks decode: root # Person who should get root's mail #root: marc abuse-myvirtualdomain.com: [email protected] My etc/postfix/virtual file is below - again myvirtualdomain is a replacement. I think this file was generated by Virtualmin and I have tried messing around with is with no success... This is the version without my changes. myunixusername@myvirtualdomain .com myunixusername myvirtualdomain .com myvirtualdomain.com [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]

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  • Altq limits not being applied to UDP transfers

    - by overkordbaever
    I have a OpenBSD server acting as a router/firewall with yhr packet filter ruleset shown below, a linux server, and a linux client. When transferring files (using netcat) by TCP, the limits are applied (for example the 100mbit limit in the example), though when transferring data by UDP, the limits aren't applied; the file always takes the same amount of time no matter the queue bandwidth limit I set (I can even turn off the queues completely, and will still get the same result). Why aren't the queuing rules applied to UDP packages? The rules used: #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low I suppose this may be related a question I've previously asked, though since it's more of a separate question, I suppose a separate question should be used for this

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  • exim sending mail to wrong mail server

    - by Chris Bull
    I have recently taken over management of a server running centos and whm. It has several websites and domains running under reseller accounts. Email has always been on a server at our actual office. I have recently changed our email from our local email server to gapps for business (our local email server was pretty archaic). However, when any email is sent from the web server (such as wordpress etc) to our domain - it still routes it to the IP of our old email server. I am not very familiar with WHM or exim so don't really know how to address this. Email to other domains works fine and the gapps is working perfectly. Any help is much appreciated.

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  • Queue emails under linux

    - by md1337
    I have a slow distant mail relay server and a web application I'm using locks up when sending e-mails to that distant mail server, until the e-mail is sent. After the e-mail is sent the page comes back and the application is snappy again. SO I'm trying to set up a differed mail queue locally on the application server (linux) so that the application uses that instead of the distant mail server. My rationale is that e-mails would get queued up locally until they are processed by the distant mail server, but at least the application doesn't lock up. I have installed postfix and set up the relayhost setting to the distant mail server, but performance has not improved. What appears to happen is that postfix just forwards my SMTP instructions in real time and doesn't really queue them? What can I do? Thanks!

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  • Testing a Non-blocking Queue

    - by jsw
    I've ported the non-blocking queue psuedocode here to C#. The code below is meant as a near verbatim copy of the paper. What approach would you take to test the implementation? Note: I'm running in VS2010 so I don't have CHESS support yet. using System.Threading; #pragma warning disable 0420 namespace ConcurrentCollections { class QueueNodePointer<T> { internal QueueNode<T> ptr; internal QueueNodePointer() : this(null) { } internal QueueNodePointer(QueueNode<T> ptr) { this.ptr = ptr; } } class QueueNode<T> { internal T value; internal QueueNodePointer<T> next; internal QueueNode() : this(default(T)) { } internal QueueNode(T value) { this.value = value; this.next = new QueueNodePointer<T>(); } } public class ConcurrentQueue<T> { private volatile int count = 0; private QueueNodePointer<T> qhead = new QueueNodePointer<T>(); private QueueNodePointer<T> qtail = new QueueNodePointer<T>(); public ConcurrentQueue() { var node = new QueueNode<T>(); node.next.ptr = null; this.qhead.ptr = this.qtail.ptr = node; } public int Count { get { return this.count; } } public void Enqueue(T value) { var node = new QueueNode<T>(value); node.next.ptr = null; QueueNodePointer<T> tail; QueueNodePointer<T> next; while (true) { tail = this.qtail; next = tail.ptr.next; if (tail == this.qtail) { if (next.ptr == null) { var newtail = new QueueNodePointer<T>(node); if (Interlocked.CompareExchange(ref tail.ptr.next, newtail, next) == next) { Interlocked.Increment(ref this.count); break; } else { Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(next.ptr), tail); } } } } Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(node), tail); } public T Dequeue() { T value; while (true) { var head = this.qhead; var tail = this.qtail; var next = head.ptr.next; if (head == this.qhead) { if (head.ptr == tail.ptr) { if (next.ptr == null) { return default(T); } Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(next.ptr), tail); } else { value = next.ptr.value; var newhead = new QueueNodePointer<T>(next.ptr); if (Interlocked.CompareExchange(ref this.qhead, newhead, head) == head) { Interlocked.Decrement(ref this.count); break; } } } } return value; } } } #pragma warning restore 0420

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  • Lockless queue implementation ends up having a loop under stress

    - by Fozi
    I have lockless queues written in C in form of a linked list that contains requests from several threads posted to and handled in a single thread. After a few hours of stress I end up having the last request's next pointer pointing to itself, which creates an endless loop and locks up the handling thread. The application runs (and fails) on both Linux and Windows. I'm debugging on Windows, where my COMPARE_EXCHANGE_PTR maps to InterlockedCompareExchangePointer. This is the code that pushes a request to the head of the list, and is called from several threads: void push_request(struct request * volatile * root, struct request * request) { assert(request); do { request->next = *root; } while(COMPARE_EXCHANGE_PTR(root, request, request->next) != request->next); } This is the code that gets a request from the end of the list, and is only called by a single thread that is handling them: struct request * pop_request(struct request * volatile * root) { struct request * volatile * p; struct request * request; do { p = root; while(*p && (*p)->next) p = &(*p)->next; // <- loops here request = *p; } while(COMPARE_EXCHANGE_PTR(p, NULL, request) != request); assert(request->next == NULL); return request; } Note that I'm not using a tail pointer because I wanted to avoid the complication of having to deal with the tail pointer in push_request. However I suspect that the problem might be in the way I find the end of the list. There are several places that push a request into the queue, but they all look generaly like this: // device->requests is defined as struct request * volatile requests; struct request * request = malloc(sizeof(struct request)); if(request) { // fill out request fields push_request(&device->requests, request); sem_post(device->request_sem); } The code that handles the request is doing more than that, but in essence does this in a loop: if(sem_wait_timeout(device->request_sem, timeout) == sem_success) { struct request * request = pop_request(&device->requests); // handle request free(request); } I also just added a function that is checking the list for duplicates before and after each operation, but I'm afraid that this check will change the timing so that I will never encounter the point where it fails. (I'm waiting for it to break as I'm writing this.) When I break the hanging program the handler thread loops in pop_request at the marked position. I have a valid list of one or more requests and the last one's next pointer points to itself. The request queues are usually short, I've never seen more then 10, and only 1 and 3 the two times I could take a look at this failure in the debugger. I thought this through as much as I could and I came to the conclusion that I should never be able to end up with a loop in my list unless I push the same request twice. I'm quite sure that this never happens. I'm also fairly sure (although not completely) that it's not the ABA problem. I know that I might pop more than one request at the same time, but I believe this is irrelevant here, and I've never seen it happening. (I'll fix this as well) I thought long and hard about how I can break my function, but I don't see a way to end up with a loop. So the question is: Can someone see a way how this can break? Can someone prove that this can not? Eventually I will solve this (maybe by using a tail pointer or some other solution - locking would be a problem because the threads that post should not be locked, I do have a RW lock at hand though) but I would like to make sure that changing the list actually solves my problem (as opposed to makes it just less likely because of different timing).

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  • JavaMail - javax.mail.MessagingException

    - by legendofawesomeness
    I am trying to write a simple mail sender class that would receive a bunch of arguments and using those will send an email out using our Exchange 2010 server. While authentication etc. seem to work fine, I am getting the following exception when the code is actually trying to send the email (I think). I have ensured that the authentication is working and I get a transport back from the session, but still it fails. Could anyone shed some like on what I am doing wrong or missing? Thanks. Exception: javax.mail.MessagingException: [EOF] at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1481) at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1512) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1054) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:634) at javax.mail.Transport.send0(Transport.java:189) at javax.mail.Transport.send(Transport.java:140) at com.ri.common.mail.util.MailSender.sendHTMLEmail(MailSender.java:75) at com.ri.common.mail.util.MailSender.main(MailSender.java:106) Relevant code: import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class MailSender { public static void sendHTMLEmail( String fromEmailId, String toEmailId, String host, String hostUserName, String hostPassword, String mailSubject, String mailBody ) { // Get system properties. Properties props = System.getProperties(); // Setup mail server props.put( "mail.transport.protocol", "smtp" ); props.put( "mail.smtp.host", host ); props.put( "mail.smtp.auth", "true" ); final String hostUName = hostUserName; final String hPassword = hostPassword; Authenticator authenticator = new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication( hostUName, hPassword ); } }; // Get the default Session object. Session session = Session.getDefaultInstance( props, authenticator ); try { // Create a default MimeMessage object. MimeMessage message = new MimeMessage( session ); // Set From: header field of the header. message.setFrom( new InternetAddress( fromEmailId ) ); // Set To: header field of the header. message.addRecipient( Message.RecipientType.TO, new InternetAddress( toEmailId ) ); // Set Subject: header field message.setSubject( mailSubject ); // Send the actual HTML message, as big as you like message.setContent( mailBody, "text/html" ); // Send message Transport.send( message, message.getAllRecipients() ); System.out.println( "Sent message successfully...." ); } catch( Exception mex ) { mex.printStackTrace(); } } public static void main( String[] args ) { String to = "[email protected]"; String from = "[email protected]"; String host = "correctHostForExch2010"; String user = "correctUser"; String password = "CorrectPassword"; String subject = "Test Email"; String body = "Hi there. This is a test email!"; MailSender.sendHTMLEmail( from, to, host, user, password, subject, body ); } } EDIT: I turned on debugging and it says MAIL FROM:<[email protected]> 530 5.7.1 Client was not authenticated DEBUG SMTP: got response code 530, with response: 530 5.7.1 Client was not authenticated. Why would that be when the session authentication succeded?

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