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• Is it okay to use a language that isn't supported by your company for some tasks?

  - by systempuntoout

  I work for a company that supports several languages: COBOL, VB6, C# and Java. I use those languages for my primary work, but I often find myself to coding some minor programs (e.g. scripts) in Python because I found it to be the best tool for that type of task. For example: An analyst gives me a complex CSV file to populate some DB tables, so I would use Python to parse it and create a DB script. What's the problem? The main problem I see is that a few parts of these quick & dirty scripts are slowly gaining importance and: My company does not support Python They're not version controlled (I back them up in another way) My coworkers do not know Python The analysts have even started referencing them in email ("launch the script that exports..."), so they are needed more often than I initially thought. I should add that these scripts are just utilities that are not part of the main project; they simply help to get trivial tasks done in less time. For my own small tasks they help a lot. In short, if I were a lottery winner to be in a accident, my coworkers would need to keep the project alive without those scripts; they would spend more time in fixing CSV errors by hand for example. Is this a common scenario? Am I doing something wrong? What should I do?

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• For what purpose I can use c++ to increase my skills?

  - by user824981

  I want to learn new things. Initially I was a PHP programmer. Then I thought it was not enough. Then I started learning Java thing. It took me 3 months to learn. Java, J2EE, Spring, Hibernte, Spring Security, Spring Roo and many design patterns MVC and stuff like AOP, DI . I never knew that before but I got the idea what J2EE. After 3 months, I just made a simple page with Registration form integrated with Spring Security. I wanted to make one complete project in it but that was too much for me and I didn't want spend more time on it as then i need to host that as well so I left that. Then I started learning Python and made few sys admin scripts and then Django and now I am finishing a complete web app in Python. Now I want to learn C++, but before that I need to find out what i can do with it. Just like I know Python is very useful because I have my own servers so I can write scripting and websites so Python is good for me. But I am confused in which areas C++ can help me. I don't want to end up like I have with Java where either I have big projects or nothing for day to day use.

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• Weird vps server issue

  - by anon-user0

  I have an unmanaged linux vps Ubuntu 11.10 (Oneiric Ocelot). I have LNMP installed. Also php-fpm php-apc, varnish, memcache. I have (or rather had) several live sites on it. under normal load the server uses ~700 mb memory. But since last night its using only 20mb~ memory and a lot of the services seems to be down (according to htop) I only see nginx working and mysql starts up and goes does every few minutes on a loop. Here are some information on the server that might help you help me: root@server:~# uname -a Linux server 2.6.18-308.el5.028stab099.3 #1 SMP Wed Mar 7 15:56:00 MSK 2012 i686 i686 i386 GNU/Linux - root@server:~# ifconfig -a lo Link encap:Local Loopback LOOPBACK MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:127.0.0.2 P-t-P:127.0.0.2 Bcast:0.0.0.0 Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 RX packets:12515 errors:0 dropped:0 overruns:0 frame:0 TX packets:9541 errors:0 dropped:1 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:7191214 (7.1 MB) TX bytes:536726 (536.7 KB) venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:176.31.158.78 P-t-P:176.31.158.78 Bcast:0.0.0.0 Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 - root@server:~# netstat -l Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:http-alt *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp6 0 0 [::]:http-alt [::]:* LISTEN tcp6 0 0 [::]:ssh [::]:* LISTEN Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 9307368 @/com/ubuntu/upstart - htop: http://i.stack.imgur.com/NHKYX.png EDIT: Stressed. mind was not working adding log: root@server:~# less /var/log/syslog Jun 27 05:27:42 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 05:39:01 server CRON[9298]: (root) CMD ([ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete) Jun 27 05:40:01 server CRON[9463]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 05:46:21 server sm-msp-queue[9480]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=00:19:14, xdelay=00:06:18, mailer=relay, pri=122407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 05:52:39 server sm-msp-queue[9480]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=03:06:32, xdelay=00:06:18, mailer=relay, pri=842407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:00:01 server CRON[15671]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 06:06:22 server sm-msp-queue[15690]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=00:39:15, xdelay=00:06:18, mailer=relay, pri=212407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:09:01 server CRON[18114]: (root) CMD ([ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete) Jun 27 06:12:40 server sm-msp-queue[15690]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=03:26:33, xdelay=00:06:18, mailer=relay, pri=932407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:20:02 server CRON[21888]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 06:26:22 server sm-msp-queue[21907]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=00:59:15, xdelay=00:06:18, mailer=relay, pri=302407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:27:02 server CRON[24021]: (root) CMD (cd / && run-parts --report /etc/cron.hourly) Jun 27 06:32:40 server sm-msp-queue[21907]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=03:46:33, xdelay=00:06:18, mailer=relay, pri=1022407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:39:01 server CRON[27941]: (root) CMD ([ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete) Jun 27 06:40:02 server CRON[28110]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 06:46:22 server sm-msp-queue[28125]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=01:19:15, xdelay=00:06:18, mailer=relay, pri=392407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:52:40 server sm-msp-queue[28125]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=04:06:33, xdelay=00:06:18, mailer=relay, pri=1112407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 06:52:40 server sm-msp-queue[28125]: q5QMk7S9009582: q5R2e4uo028125: sender notify: Warning: could not send message for past 4 hours Jun 27 06:52:44 server sm-msp-queue[28125]: q5R2e4uo028125: to=root, delay=00:00:04, xdelay=00:00:04, mailer=relay, pri=33690, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:00:02 server CRON[1543]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 07:06:21 server sm-msp-queue[1560]: q5R2e4uo028125: to=root, delay=00:13:41, xdelay=00:06:18, mailer=relay, pri=123690, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:09:01 server CRON[3986]: (root) CMD ([ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete) Jun 27 07:12:39 server sm-msp-queue[1560]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=01:45:32, xdelay=00:06:18, mailer=relay, pri=482407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:18:57 server sm-msp-queue[1560]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=04:32:50, xdelay=00:06:18, mailer=relay, pri=1202407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:20:02 server CRON[7760]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Jun 27 07:26:22 server sm-msp-queue[7775]: q5R2e4uo028125: to=root, delay=00:33:42, xdelay=00:06:18, mailer=relay, pri=213690, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:27:01 server CRON[9887]: (root) CMD (cd / && run-parts --report /etc/cron.hourly) Jun 27 07:32:40 server sm-msp-queue[7775]: q5R1R7Ue004056: to=root, ctladdr=root (0/0), delay=02:05:33, xdelay=00:06:18, mailer=relay, pri=572407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:38:58 server sm-msp-queue[7775]: q5QMk7S9009582: to=root, ctladdr=root (0/0), delay=04:52:51, xdelay=00:06:18, mailer=relay, pri=1292407, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1] Jun 27 07:39:01 server CRON[13813]: (root) CMD ([ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth : root@server:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/simfs 20G 2.3G 18G 12% / - Jun 26 16:22:41 server varnishd[1413]: Child (32425) died signal=3 Jun 26 16:22:41 server varnishd[1413]: child (21687) Started Jun 26 16:22:41 server varnishd[1413]: Child (21687) said Child starts Jun 26 16:22:41 server varnishd[1413]: Child (21687) said SMF.s0 mmap'ed 1073741824 bytes of 1073741824 Jun 26 16:34:28 server -- MARK -- Jun 26 16:54:29 server -- MARK -- Jun 26 17:14:29 server -- MARK -- Jun 26 17:34:29 server -- MARK -- Jun 26 17:54:29 server -- MARK -- Jun 26 18:14:29 server -- MARK -- Jun 26 18:34:29 server -- MARK -- Jun 26 18:54:29 server -- MARK -- Jun 26 19:14:29 server -- MARK -- Jun 26 19:34:29 server -- MARK -- Jun 26 19:54:29 server -- MARK -- Jun 26 20:14:29 server -- MARK -- Jun 26 20:34:29 server -- MARK -- Jun 26 20:48:12 server exiting on signal 15 Jun 26 20:51:58 server syslogd 1.5.0#6ubuntu1: restart. Jun 26 20:52:01 server varnishd[1324]: Platform: Linux,2.6.18-308.el5.028stab099.3,i686,-sfile,-smalloc,-hcritbit Jun 26 21:11:58 server -- MARK -- Jun 26 21:31:58 server -- MARK -- Jun 26 21:51:58 server -- MARK -- Jun 26 22:11:58 server -- MARK -- Jun 26 22:31:58 server -- MARK -- Jun 26 22:51:58 server -- MARK -- Jun 26 23:11:58 server -- MARK -- Jun 26 23:31:58 server -- MARK -- Jun 26 23:51:58 server -- MARK -- Jun 27 00:11:58 server -- MARK -- Jun 27 00:23:42 server exiting on signal 15 Jun 27 02:21:10 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 02:21:12 server varnishd[1341]: Platform: Linux,2.6.18-308.el5.028stab099.3,i686,-sfile,-smalloc,-hcritbit Jun 27 02:41:10 server -- MARK -- Jun 27 02:46:41 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 03:20:44 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 03:20:46 server varnishd[1238]: Platform: Linux,2.6.18-308.el5.028stab099.3,i686,-sfile,-smalloc,-hcritbit Jun 27 03:20:46 server varnishd[1238]: child (1239) Started Jun 27 03:20:46 server varnishd[1238]: Child (1239) said Child starts Jun 27 03:20:46 server varnishd[1238]: Child (1239) said SMF.s0 mmap'ed 1073741824 bytes of 1073741824 Jun 27 03:32:52 server exiting on signal 15 Jun 27 03:33:16 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 03:33:31 server varnishd[1372]: Platform: Linux,2.6.18-308.el5.028stab099.3,i686,-sfile,-smalloc,-hcritbit Jun 27 03:53:16 server -- MARK -- Jun 27 04:13:16 server -- MARK -- Jun 27 04:33:16 server -- MARK -- Jun 27 04:53:16 server -- MARK -- Jun 27 05:13:16 server -- MARK -- Jun 27 05:27:42 server syslogd 1.5.0#6ubuntu1: restart. Jun 27 05:53:17 server -- MARK -- Jun 27 06:13:17 server -- MARK -- Jun 27 06:33:17 server -- MARK -- Jun 27 06:53:17 server -- MARK -- Jun 27 07:13:17 server -- MARK -- Jun 27 07:33:17 server -- MARK -- Jun 27 07:53:17 server -- MARK -- Jun 27 08:13:17 server -- MARK -- Jun 27 08:33:17 server -- MARK -- Jun 27 08:53:17 server -- MARK -- Jun 27 09:13:17 server -- MARK -- Jun 27 09:33:17 server -- MARK -- Jun 27 09:53:17 server -- MARK -- Jun 27 10:13:17 server -- MARK -- Jun 27 10:33:17 server -- MARK -- Jun 27 10:53:17 server -- MARK -- Jun 27 11:13:17 server -- MARK -- Jun 27 11:33:17 server -- MARK -- Jun 27 11:53:18 server -- MARK -- Jun 27 12:13:18 server -- MARK -- Jun 27 12:33:18 server -- MARK -- Jun 27 12:53:18 server -- MARK -- Jun 27 13:13:18 server -- MARK -- Jun 27 13:33:18 server -- MARK -- Jun 27 13:53:18 server -- MARK -- Jun 27 14:13:18 server -- MARK -- Jun 27 14:33:18 server -- MARK -- Jun 27 14:53:18 server -- MARK -- -- root@server:~# cat /var/log/nginx/error.log 2012/06/27 03:32:54 [alert] 1199#0: worker process 1203 exited on signal 9 2012/06/27 03:32:54 [alert] 1199#0: worker process 1200 exited on signal 9 2012/06/27 03:32:54 [alert] 1199#0: worker process 1201 exited on signal 9 2012/06/27 03:32:54 [alert] 1199#0: worker process 1202 exited on signal 9 root@server:~# cat /var/log/nginx/access.log 31.210.99.87 - - [27/Jun/2012:09:09:08 +0400] "GET /w00tw00t.at.ISC.SANS.DFind:) HTTP/1.1" 400 172 "-" "-" 88.191.138.103 - - [27/Jun/2012:13:27:08 +0400] "GET /cms/cmx.jsp HTTP/1.1" 301 184 "-" "-" 88.191.138.103 - - [27/Jun/2012:13:27:08 +0400] "GET /iesvc/iesvc.jsp HTTP/1.1" 301 184 "-" "-" 88.191.138.103 - - [27/Jun/2012:13:27:08 +0400] "GET /cmd2/index.jsp HTTP/1.1" 301 184 "-" "-" 88.191.138.103 - - [27/Jun/2012:13:27:09 +0400] "GET /cmd/index.jsp HTTP/1.1" 301 184 "-" "-" 58.97.147.197 - - [27/Jun/2012:17:17:19 +0400] "GET / HTTP/1.1" 301 184 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5" 58.97.147.197 - - [27/Jun/2012:17:17:37 +0400] "GET / HTTP/1.1" 301 184 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5" 58.97.147.197 - - [27/Jun/2012:17:17:38 +0400] "-" 400 0 "-" "-" 58.97.147.197 - - [27/Jun/2012:17:17:38 +0400] "-" 400 0 "-" "-" 58.97.147.197 - - [27/Jun/2012:17:17:48 +0400] "-" 400 0 "-" "-" - root@server:~# cat /var/log/daemon.log Jun 26 20:48:10 server xinetd[1177]: Exiting... Jun 26 20:51:58 server xinetd[1174]: Reading included configuration file: /etc/xinetd.d/daytime [file=/etc/xinetd.d/daytime] [line=28] Jun 26 20:51:58 server xinetd[1174]: Reading included configuration file: /etc/xinetd.d/discard [file=/etc/xinetd.d/discard] [line=26] Jun 26 20:51:58 server xinetd[1174]: Reading included configuration file: /etc/xinetd.d/echo [file=/etc/xinetd.d/echo] [line=25] Jun 26 20:51:58 server xinetd[1174]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=26] Jun 26 20:51:58 server xinetd[1174]: removing chargen Jun 26 20:51:58 server xinetd[1174]: removing chargen Jun 26 20:51:58 server xinetd[1174]: removing daytime Jun 26 20:51:58 server xinetd[1174]: removing daytime Jun 26 20:51:58 server xinetd[1174]: removing discard Jun 26 20:51:58 server xinetd[1174]: removing discard Jun 26 20:51:58 server xinetd[1174]: removing echo Jun 26 20:51:58 server xinetd[1174]: removing echo Jun 26 20:51:58 server xinetd[1174]: removing time Jun 26 20:51:58 server xinetd[1174]: removing time Jun 26 20:51:58 server xinetd[1174]: xinetd Version 2.3.14 started with libwrap loadavg options compiled in. Jun 26 20:51:58 server xinetd[1174]: Started working: 0 available services Jun 26 20:52:01 server vnstatd[1330]: vnStat daemon 1.11 started. Jun 26 20:52:01 server vnstatd[1330]: Monitoring: venet0 Jun 27 00:23:41 server xinetd[1174]: Exiting... Jun 27 02:21:12 server vnstatd[1349]: vnStat daemon 1.11 started. Jun 27 02:21:12 server vnstatd[1349]: Monitoring: venet0 Jun 27 03:20:44 server xinetd[1166]: attribute: disable should not be in default section [file=/etc/xinetd.conf] [line=12] Jun 27 03:20:44 server xinetd[1166]: Reading included configuration file: /etc/xinetd.d/chargen [file=/etc/xinetd.conf] [line=15] Jun 27 03:20:44 server xinetd[1166]: Reading included configuration file: /etc/xinetd.d/daytime [file=/etc/xinetd.d/daytime] [line=28] Jun 27 03:20:44 server xinetd[1166]: Reading included configuration file: /etc/xinetd.d/discard [file=/etc/xinetd.d/discard] [line=26] Jun 27 03:20:44 server xinetd[1166]: Reading included configuration file: /etc/xinetd.d/echo [file=/etc/xinetd.d/echo] [line=25] Jun 27 03:20:44 server xinetd[1166]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=26] Jun 27 03:20:44 server xinetd[1166]: removing chargen Jun 27 03:20:44 server xinetd[1166]: removing chargen Jun 27 03:20:44 server xinetd[1166]: removing daytime Jun 27 03:20:44 server xinetd[1166]: removing daytime Jun 27 03:20:44 server xinetd[1166]: removing discard Jun 27 03:20:44 server xinetd[1166]: removing discard Jun 27 03:20:44 server xinetd[1166]: removing echo Jun 27 03:20:44 server xinetd[1166]: removing echo Jun 27 03:20:44 server xinetd[1166]: removing time Jun 27 03:20:44 server xinetd[1166]: removing time Jun 27 03:20:44 server xinetd[1166]: xinetd Version 2.3.14 started with libwrap loadavg options compiled in. Jun 27 03:20:44 server xinetd[1166]: Started working: 0 available services Jun 27 03:20:46 server vnstatd[1249]: vnStat daemon 1.11 started. Jun 27 03:20:46 server vnstatd[1249]: Monitoring: venet0 Jun 27 03:32:41 server xinetd[1166]: Exiting... Jun 27 03:33:32 server vnstatd[1380]: vnStat daemon 1.11 started. Jun 27 03:33:32 server vnstatd[1380]: Monitoring: venet0 root@server:~# - Anything else you need let me know

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• PyGTK: dynamic label wrapping

  - by detly

  It's a known bug/issue that a label in GTK will not dynamically resize when the parent changes. It's one of those really annoying small details, and I want to hack around it if possible. I followed the approach at 16 software, but as per the disclaimer you cannot then resize it smaller. So I attempted a trick mentioned in one of the comments (the set_size_request call in the signal callback), but this results in some sort of infinite loop (try it and see). Does anyone have any other ideas? (You can't block the signal just for the duration of the call, since as the print statements seem to indicate, the problem starts after the function is left.) The code is below. You can see what I mean if you run it and try to resize the window larger and then smaller. (If you want to see the original problem, comment out the line after "Connect to the size-allocate signal", run it, and resize the window bigger.) The Glade file ("example.glade"): <?xml version="1.0"?> <glade-interface> <!-- interface-requires gtk+ 2.16 --> <!-- interface-naming-policy project-wide --> <widget class="GtkWindow" id="window1"> <property name="visible">True</property> <signal name="destroy" handler="on_destroy"/> <child> <widget class="GtkLabel" id="label1"> <property name="visible">True</property> <property name="label" translatable="yes">In publishing and graphic design, lorem ipsum[p][1][2] is the name given to commonly used placeholder text (filler text) to demonstrate the graphic elements of a document or visual presentation, such as font, typography, and layout. The lorem ipsum text, which is typically a nonsensical list of semi-Latin words, is a hacked version of a Latin text by Cicero, with words/letters omitted and others inserted, but not proper Latin[1][2] (see below: History and discovery). The closest English translation would be "pain itself" (dolorem = pain, grief, misery, suffering; ipsum = itself).</property> <property name="wrap">True</property> </widget> </child> </widget> </glade-interface> The Python code: #!/usr/bin/python import pygtk import gobject import gtk.glade def wrapped_label_hack(gtklabel, allocation): print "In wrapped_label_hack" gtklabel.set_size_request(allocation.width, -1) # If you uncomment this, we get INFINITE LOOPING! # gtklabel.set_size_request(-1, -1) print "Leaving wrapped_label_hack" class ExampleGTK: def __init__(self, filename): self.tree = gtk.glade.XML(filename, "window1", "Example") self.id = "window1" self.tree.signal_autoconnect(self) # Connect to the size-allocate signal self.get_widget("label1").connect("size-allocate", wrapped_label_hack) def on_destroy(self, widget): self.close() def get_widget(self, id): return self.tree.get_widget(id) def close(self): window = self.get_widget(self.id) if window is not None: window.destroy() gtk.main_quit() if __name__ == "__main__": window = ExampleGTK("example.glade") gtk.main()

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• Why does my ko computed observable not update bound UI elements when its value changes?

  - by Allen

  I'm trying to wrap a cookie in a computed observable (which I'll later turn into a protectedObservable) and I'm having some problems with the computed observable. I was under the opinion that changes to the computed observable would be broadcast to any UI elements that have been bound to it. I've created the following fiddle JavaScript: var viewModel = {}; // simulating a cookie store, this part isnt as important var cookie = function () { // simulating a value stored in cookies var privateZipcode = "12345"; return { 'write' : function (val) { privateZipcode = val; }, 'read': function () { return privateZipcode; } } }(); viewModel.zipcode = ko.computed({ read: function () { return cookie.read(); }, write: function (value) { cookie.write(value); }, owner: viewModel }); ko.applyBindings(viewModel);? HTML: zipcode: <input type='text' data-bind="value: zipcode"> <br /> zipcode: <span data-bind="text: zipcode"></span>? I'm not using an observable to store privateZipcode since that's really just going to be in a cookie. I'm hoping that the ko.computed will provide the notifications and binding functionality that I need, though most of the examples I've seen with ko.computed end up using a ko.observable underneath the covers. Shouldn't the act of writing the value to my computed observable signal the UI elements that are bound to its value? Shouldn't these just update? Workaround I've got a simple workaround where I just use a ko.observable along side of my cookie store and using that will trigger the required updates to my DOM elements but this seems completely unnecessary, unless ko.computed lacks the signaling / dependency type functionality that ko.observable has. My workaround fiddle, you'll notice that the only thing that changes is that I added a seperateObservable that isn't used as a store, its only purpose is to signal to the UI that the underlying data has changed. // simulating a cookie store, this part isnt as important var cookie = function () { // simulating a value stored in cookies var privateZipcode = "12345"; // extra observable that isnt really used as a store, just to trigger updates to the UI var seperateObservable = ko.observable(privateZipcode); return { 'write' : function (val) { privateZipcode = val; seperateObservable(val); }, 'read': function () { seperateObservable(); return privateZipcode; } } }(); This makes sense and works as I'd expect because viewModel.zipcode depends on seperateObservable and updates to that should (and does) signal the UI to update. What I don't understand, is why doesn't a call to the write function on my ko.computed signal the UI to update, since that element is bound to that ko.computed? I suspected that I might have to use something in knockout to manually signal that my ko.computed has been updated, and I'm fine with that, that makes sense. I just haven't been able to find a way to accomplish that.

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• linked list elements gone?

  - by Hristo

  I create a linked list dynamically and initialize the first node in main(), and I add to the list every time I spawn a worker process. Before the worker process exits, I print the list. Also, I print the list inside my sigchld signal handler. in main(): head = NULL; tail = NULL; // linked list to keep track of worker process dll_node_t *node; node = (dll_node_t *) malloc(sizeof(dll_node_t)); // initialize list, allocate memory append_node(node); node->pid = mainPID; // the first node is the MAIN process node->type = MAIN; in a fork()'d process: // add to list dll_node_t *node; node = (dll_node_t *) malloc(sizeof(dll_node_t)); append_node(node); node->pid = mmapFileWorkerStats->childPID; node->workerFileName = mmapFileWorkerStats->workerFileName; node->type = WORK; functions: void append_node(dll_node_t *nodeToAppend) { /* * append param node to end of list */ // if the list is empty if (head == NULL) { // create the first/head node head = nodeToAppend; nodeToAppend->prev = NULL; } else { tail->next = nodeToAppend; nodeToAppend->prev = tail; } // fix the tail to point to the new node tail = nodeToAppend; nodeToAppend->next = NULL; } finally... the signal handler: void chld_signalHandler() { dll_node_t *temp1 = head; while (temp1 != NULL) { printf("2. node's pid: %d\n", temp1->pid); temp1 = temp1->next; } int termChildPID = waitpid(-1, NULL, WNOHANG); dll_node_t *temp = head; while (temp != NULL) { if (temp->pid == termChildPID) { printf("found process: %d\n", temp->pid); } temp = temp->next; } return; } Is it true that upon the worker process exiting, the SIGCHLD signal handler is triggered? If so, that would mean that after I print the tree before exiting, the next thing I do is in the signal handler which is print the tree... which would mean i would print the tree twice? But the tree isn't the same. The node I add in the worker process doesn't exist when I print in the signal handler or at the very end of main(). Any idea why? Thanks, Hristo

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• Why is there still so much offer for Perl programmers?

  - by user491444

  A quick search on monster.com on different scripting languages resulted on Perl having much more job opportunities than Python and Ruby (in Europe, I didn't check for the rest of the world), and since I'm just a newbie programmer I was wondering why is this? I've read everywhere that Python and Ruby are much better languages, and much more organized. Having coded in python and php myself, Perl's code seems so alien to me. Anyways, sorry for my poor English, it's my second language, and this is not a critique on the Perl language, I was just wondering whether it's a good idea to learn it at this point or not.

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• How are Programing Language Designed?

  - by Anteater7171

  After doing a bit of programing, I've become quite curious on language design itself. I'm still a novice (I've been doing it for about a year), so the majority of my code pertains to only two fields (GUI design in Python and basic algorithms in C/C++). I have become intrigued with how the actual languages themselves are written. I mean this in both senses. Such as how it was literally written (ie, what language the language was written in). As well as various features like white spacing (Python) or object orientation (C++ and Python). Where would one start learning how to write a language? What are some of the fundamentals of language design, things that would make it a "complete" language?

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• Best/Easiest Technology for a RESTful webservice [closed]

  - by user1751547

  So I'm going to be creating a phone app + website that will need to utilize a web service. Webservices are completely outside my domain so I'm not entirely sure where to start. Does anybody have any suggestions on the technology stack I should use? (mainly in terms of ease of use and reliability) So far what I've looked at are: RoR Python + Django + TastyPie Python + Flask Microsoft WCF 3.5 PHP + some framework I would rather not do anything with Java I'm leaning towards the Python + Django + TastyPie route as it seems like it would be easy to get up and going and learn in general. My only concern with it is the reliability of the libraries (feature breaking updates, abandonment, etc). Also I would prefer to create the website with the same framework so I wouldn't have to deal with learning and using two different ones. Any advice would be helpful, thanks.

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• Alternatives to Project Euler for improving Excel ability

  - by Jonathan Deamer

  I've recently been enjoying using the mathematical problems listed at Project Euler to learn Python. My Excel ability is better than my Python, but I think I'd still benefit from the sort of inductive learning that comes with solving a series of increasingly difficult puzzles using a particular tool. I know Project Euler can be completed using Excel, but are there any other puzzle series similar to this or The Python Challenge specifically tailored for people trying to increase their knowledge of Excel and what it can do? NB. I'm not looking for a "tutorial", I know there are plenty of these. And apologies if this isn't completely appropriate for programmers.SE.com - some of the folks at SuperUser suggested it was a better fit here than there!

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• 'module' object has no attribute 'PY2'

  - by ManikandanV

  I am using ubuntu 14.04, was trying to install python-memcache. I have got an error like Downloading/unpacking python-memcached Downloading python-memcached-1.53.tar.gz Cleaning up... Exception: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main status = self.run(options, args) File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1229, in prepare_files req_to_install.run_egg_info() File "/usr/lib/python2.7/dist-packages/pip/req.py", line 292, in run_egg_info logger.notify('Running setup.py (path:%s) egg_info for package %s' % (self.setup_py, self.name)) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 284, in setup_py if six.PY2 and isinstance(setup_py, six.text_type): AttributeError: 'module' object has no attribute 'PY2' Storing debug log for failure in /home/mani/.pip/pip.log I am getting the same error when installing Django-celery, pymongo etc

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• YouTube Scalability Lessons

  - by Bertrand Matthelié

  @font-face { font-family: "Arial"; }@font-face { font-family: "Courier New"; }@font-face { font-family: "Wingdings"; }@font-face { font-family: "Calibri"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }h2 { margin: 12pt 0cm 3pt; page-break-after: avoid; font-size: 14pt; font-family: "Times New Roman"; font-style: italic; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }span.Heading2Char { font-family: Calibri; font-weight: bold; font-style: italic; }div.Section1 { page: Section1; }ol { margin-bottom: 0cm; }ul { margin-bottom: 0cm; } Very interesting blog post by Todd Hoff at highscalability.com presenting “7 Years of YouTube Scalability Lessons in 30 min” based on a presentation from Mike Solomon, one of the original engineers at YouTube: …. The key takeaway away of the talk for me was doing a lot with really simple tools. While many teams are moving on to more complex ecosystems, YouTube really does keep it simple. They program primarily in Python, use MySQL as their database, they’ve stuck with Apache, and even new features for such a massive site start as a very simple Python program. That doesn’t mean YouTube doesn’t do cool stuff, they do, but what makes everything work together is more a philosophy or a way of doing things than technological hocus pocus. What made YouTube into one of the world’s largest websites? Read on and see... Stats @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } 4 billion Views a day 60 hours of video is uploaded every minute 350+ million devices are YouTube enabled Revenue double in 2010 The number of videos has gone up 9 orders of magnitude and the number of developers has only gone up two orders of magnitude. 1 million lines of Python code Stack @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } Python - most of the lines of code for YouTube are still in Python. Everytime you watch a YouTube video you are executing a bunch of Python code. Apache - when you think you need to get rid of it, you don’t. Apache is a real rockstar technology at YouTube because they keep it simple. Every request goes through Apache. Linux - the benefit of Linux is there’s always a way to get in and see how your system is behaving. No matter how bad your app is behaving, you can take a look at it with Linux tools like strace and tcpdump. MySQL - is used a lot. When you watch a video you are getting data from MySQL. Sometime it’s used a relational database or a blob store. It’s about tuning and making choices about how you organize your data. Vitess- a  new project released by YouTube, written in Go, it’s a frontend to MySQL. It does a lot of optimization on the fly, it rewrites queries and acts as a proxy. Currently it serves every YouTube database request. It’s RPC based. Zookeeper - a distributed lock server. It’s used for configuration. Really interesting piece of technology. Hard to use correctly so read the manual Wiseguy - a CGI servlet container. Spitfire - a templating system. It has an abstract syntax tree that let’s them do transformations to make things go faster. Serialization formats - no matter which one you use, they are all expensive. Measure. Don’t use pickle. Not a good choice. Found protocol buffers slow. They wrote their own BSON implementation, which is 10-15 time faster than the one you can download. ...Contiues. Read the blog Watch the video

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• How to make custom libraries accessible?

  - by Milen Bilyanov

  I am trying to compile and install every custom module under it's own designated folder. (ex: /myApps/myLinux/compiled_app) I had luck with python so far, where my python is compiled from source and lives in: /myApps/myLinux/python2.5 and "python2.5" - /myApps/myLinux/python2.5.6-gcc463 so I can access this python through a wrapper script that sets the right environment. The question is recently I had to compile and add something called gperf3.0.4. So now it lives: /myApps/myLinux/gperf3.0 and "gperf3.0" - /myApps/myLinux/gperf3.0.4-gcc463 The question is: How will I point to this lib if some other app needs to access it? Is it done through the LD_LIBRARY_PATH variable? Thanks.

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• Is type safety worth the trade-offs?

  - by Prof Plum

  I began coding in in Python primarily where there is no type safety, then moved to C# and Java where there is. I found that I could work a bit more quickly and with less headaches in Python, but then again, my C# and Java apps are at much higher level of complexity so I have never given Python a true stress test I suppose. The Java and C# camps make it sound like without the type safety in place, most people would be running into all sorts of horrible bugs left an right and it would be more trouble than its worth. This is not a language comparison, so please do not address issues like compiled vs interpreted. Is type safety worth the hit to speed of development and flexibilty? WHY? to the people who wanted an example of the opinion that dynamic typing is faster: "Use a dynamically typed language during development. It gives you faster feedback, turn-around time, and development speed." - http://blog.jayway.com/2010/04/14/static-typing-is-the-root-of-all-evil/

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• What's shell script's advantage over interpreted programming languages?

  - by Lai Yu-Hsuan

  (I'm not sure if it's a appropriate question here) Shell script, like bash, can do many things. It can call Unix programs, pipe their output, redirect I/O from/to files, control flow, check whether a file exists, etc. But a modern programming language, e.g, python and ruby, can also do these all. And their are (I think) more readable and maintainable. bash is worldwide spreaded. But many distributions have installed python interpreter, too. So what's the advantage of shell script? If I could write python, ruby or perl, is it worth to learn bash?

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• How to choose a language, when taking in account the community it includes?

  - by Rick Rhodes

  I was reading the following article: Great Hackers The following part grabbed my attention: "When you choose a language, you're also choosing a community. The programmers you'll be able to hire to work on a Java project won't be as smart as the ones you could get to work on a project written in Python. And the quality of your hackers probably matters more than the language you choose. Though, frankly, the fact that good hackers prefer Python to Java should tell you something about the relative merits of those languages." I would like to apply his advice on a commercial web application I am building (I am a strong believer in culture and community), yet this article was written in 2004, and python has increased in popularity in the recent years. How can I decided a language when taking in consideration its community, rather than the popularity? Any recommendations? Is there any language community that show dedication and passion for developing, rather than learning a language to get a Job and a paycheck?

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• What is a *slightly* less extreme equivalent to being "fluent" in a language?

  - by Mehrdad

  tl;dr: What is a less extreme (but still noticeable) alternative to the word "fluent", when saying e.g. "I am fluent in C++/Python/whatever?" I think I can call myself "fluent" in C#, because I know the language and runtime very well, and I'm very familiar with the .NET framework's APIs and classes, etc. I would like to claim the same thing for Python and C++. But while I can program in Python (I did so for an entire summer, making a website with Django), for example, I would not call myself fluent because my code isn't always "Pythonic" (e.g. using map/filter vs. list comprehensions), and I'm not too intimate with some aspects of the language and standard library yet (e.g. the introspection API, etc.). Is there a word or phrase I can use on e.g. a resume to describe what I know? I can think of "very familiar with", but is there a better word/phrase I can use?

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• How are Programming Languages Designed?

  - by RectangleTangle

  After doing a bit of programming, I've become quite curious on language design itself. I'm still a novice (I've been doing it for about a year), so the majority of my code pertains to only two fields (GUI design in Python and basic algorithms in C/C++). I have become intrigued with how the actual languages themselves are written. I mean this in both senses. Such as how it was literally written (ie, what language the language was written in). As well as various features like white spacing (Python) or object orientation (C++ and Python). Where would one start learning how to write a language? What are some of the fundamentals of language design, things that would make it a "complete" language?

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• How would i down-sample a .wav file then reconstruct it using nyquist? - in matlab [closed]

  - by martin

  Possible Duplicate: How would i down-sample a .wav file then reconstruct it using nyquist? - in matlab This is all done in MatLab 2010 My objective is to show the results of: undersampling, nyquist rate/ oversampling First i need to downsample the .wav file to get an incomplete/ or impartial data stream that i can then reconstuct. Heres the flow chart of what im going to be doing So the flow is analog signal - sampling analog filter - ADC - resample down - resample up - DAC - reconstruction analog filter what needs to be achieved: F= Frequency F(Hz=1/s) E.x. 100Hz = 1000 (Cyc/sec) F(s)= 1/(2f) Example problem: 1000 hz = Highest frequency 1/2(1000hz) = 1/2000 = 5x10(-3) sec/cyc or a sampling rate of 5ms This is my first signal processing project using matlab. what i have so far. % Fs = frequency sampled (44100hz or the sampling frequency of a cd) [test,fs]=wavread('test.wav'); % loads the .wav file left=test(:,1); % Plot of the .wav signal time vs. strength time=(1/44100)*length(left); t=linspace(0,time,length(left)); plot(t,left) xlabel('time (sec)'); ylabel('relative signal strength') **%this is were i would need to sample it at the different frequecys (both above and below and at) nyquist frequency.*I think.*** soundsc(left,fs) % shows the resaultant audio file , which is the same as original ( only at or above nyquist frequency however) Can anyone tell me how to make it better, and how to do the various sampling at different frequencies?

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• When does a PHP <5.3.0 daemon script receive signals?

  - by MidnightLightning

  I've got a PHP script in the works that is a job worker; its main task is to check a database table for new jobs, and if there are any, to act on them. But jobs will be coming in in bursts, with long gaps in between, so I devised a sleep cycle like: while(true) { if ($jobs = get_new_jobs()) { // Act upon the jobs } else { // No new jobs now sleep(30); } } Good, but in some cases that means there might be a 30 second lag before a new job is acted upon. Since this is a daemon script, I figured I'd try the pcntl_signal hook to catch a SIGUSR1 signal to nudge the script to wake up, like: $_isAwake = true; function user_sig($signo) { global $_isAwake; daemon_log("Caught SIGUSR1"); $_isAwake = true; } pcntl_signal(SIGUSR1, 'user_sig'); while(true) { if ($jobs = get_new_jobs()) { // Act upon the jobs } else { // No new jobs now daemon_log("No new jobs, sleeping..."); $_isAwake = false; $ts = time(); while(time() < $ts+30) { sleep(1); if ($_isAwake) break; // Did a signal happen while we were sleeping? If so, stop sleeping } $_isAwake = true; } } I broke the sleep(30) up into smaller sleep bits, in case a signal doesn't interrupt a sleep() command, thinking that this would cause at most a one-second delay, but in the log file, I'm seeing that the SIGUSR1 isn't being caught until after the full 30 seconds has passed (and maybe the outer while loop resets). I found the pcntl_signal_dispatch command, but that's only for PHP 5.3 and higher. If I were using that version, I could stick a call to that command before the if ($_isAwake) call, but as it currently stands I'm on 5.2.13. On what sort of situations is the signals queue interpreted in PHP versions without the means to explicitly call the queue parsing? Could I put in some other useless command in that sleep loop that would trigger a signal queue parse within there?

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• Simple menubar using Qt4

  - by Buzz

  Hi all i'm trying to make a simple GUI with QT 4.6. i made a separete class that represents the menu bar: MenuBar::MenuBar() { aboutAct = new QAction(tr("&About QT"), this); aboutAct->setStatusTip(tr("Show the application's About box")); connect(aboutAct, SIGNAL(triggered()), this, SLOT(about())); quitAct = new QAction(tr("&Quit"),this); quitAct->setStatusTip(tr("Exit to the program")); //connect(quitAct, SIGNAL(triggered()), &QApp, SLOT(quit())); menuFile = new QMenu("File"); menuFile->addAction(quitAct); menuLinks = new QMenu("Links"); menuAbout = new QMenu("Info"); menuAbout->addAction(aboutAct); addMenu(menuFile); addMenu(menuLinks); addMenu(menuAbout); } i can't connect the signal of the quitAct with the quit slot of the main application probably because it is not visible from the MenuBar class.. //connect(quitAct, SIGNAL(triggered()), &QApp, SLOT(quit())); how can i do it?

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• UIImage imageNamed not autoreleasing correctly

  - by MrHen

  For some reason, the retain/release behavior in the following code has me completely baffled. selectedImage = [UIImage imageNamed:@"icon_72.png"]; [selectedImage release]; This should break but does not. Why? I thought imageNamed autoreleased itself which means the release here is redundant and should break when the autorelease occurs. Here are snippets relevant to selectedImage from the .h and .m files: @property (nonatomic, readonly) UIImage *selectedImage; @synthesize delegate, selectedImage, spacerBottom, currentIndex; Other notes, this does break: selectedImage = [UIImage imageNamed:@"icon_72.png"]; [selectedImage release]; [selectedImage release]; //objc[55541]: FREED(id): message release sent to freed object=0x59245b0 //Program received signal: “EXC_BAD_INSTRUCTION”. As does this: selectedImage = [UIImage imageNamed:@"icon_72.png"]; [selectedImage release]; [selectedImage autorelease]; //objc[55403]: FREED(id): message autorelease sent to freed object=0x59b54c0 //Program received signal: “EXC_BAD_INSTRUCTION”. And so does the following: selectedImage = [UIImage imageNamed:@"icon_72.png"]; [selectedImage autorelease]; [selectedImage release]; //objc[55264]: FREED(id): message release sent to freed object=0x592c9a0 //Program received signal: “EXC_BAD_INSTRUCTION”. And so does this: selectedImage = [UIImage imageNamed:@"icon_72.png"]; [selectedImage autorelease]; [selectedImage autorelease]; //objc[55635]: FREED(id): message release sent to freed object=0x5b305d0 //Program received signal: “EXC_BAD_INSTRUCTION”.

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• verilog / systemverilog -- What is the behavior of blocking statements across two always blocks?

  - by miles.sherman

  I am wondering about the behavior of the below code. There are two always blocks, one is combinational to calculate the next_state signal, the other is sequential which will perform some logic and determine whether or not to shutdown the system. It does this by setting the shutdown_now signal high and then calling state <= next_state. My question is if the conditions become true that the shutdown_now signal is set (during clock cycle n) in a blocking manner before the state <= next_state line, will the state during clock cycle n+1 be SHUTDOWN or RUNNING? In other words, does the shutdown_now = 1'b1 line block across both state machines since the state signal is dependent on it through the next_state determination? enum {IDLE, RUNNING, SHUTDOWN} state, next_state; logic shutdown_now; // State machine (combinational) always_comb begin case (state) IDLE: next_state <= RUNNING; RUNNING: next_state <= shutdown ? SHUTDOWN : RUNNING; SHUTDOWN: next_state <= SHUTDOWN; default: next_state <= SHUTDOWN; endcase end // Sequential Behavior always_ff @ (posedge clk) begin // Some code here if (/*some condition) begin shutdown_now = 1'b0; end else begin shutdown_now = 1'b1; end state <= next_state; end

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• Lightweight alternative to Manual/AutoResetEvent in C#

  - by sweetlilmre

  Hi, I have written what I hope is a lightweight alternative to using the ManualResetEvent and AutoResetEvent classes in C#/.NET. The reasoning behind this was to have Event like functionality without the weight of using a kernel locking object. Although the code seems to work well in both testing and production, getting this kind of thing right for all possibilities can be a fraught undertaking and I would humbly request any constructive comments and or criticism from the StackOverflow crowd on this. Hopefully (after review) this will be useful to others. Usage should be similar to the Manual/AutoResetEvent classes with Notify() used for Set(). Here goes: using System; using System.Threading; public class Signal { private readonly object _lock = new object(); private readonly bool _autoResetSignal; private bool _notified; public Signal() : this(false, false) { } public Signal(bool initialState, bool autoReset) { _autoResetSignal = autoReset; _notified = initialState; } public virtual void Notify() { lock (_lock) { // first time? if (!_notified) { // set the flag _notified = true; // unblock a thread which is waiting on this signal Monitor.Pulse(_lock); } } } public void Wait() { Wait(Timeout.Infinite); } public virtual bool Wait(int milliseconds) { lock (_lock) { bool ret = true; // this check needs to be inside the lock otherwise you can get nailed // with a race condition where the notify thread sets the flag AFTER // the waiting thread has checked it and acquires the lock and does the // pulse before the Monitor.Wait below - when this happens the caller // will wait forever as he "just missed" the only pulse which is ever // going to happen if (!_notified) { ret = Monitor.Wait(_lock, milliseconds); } if (_autoResetSignal) { _notified = false; } return (ret); } } }

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• How to delete a QProcess instance correctly?

  - by Kopfschmerzen

  Hi everyone! I have a class looking like this: class FakeRunner : public QObject { Q_OBJECT private: QProcess* proc; public: FakeRunner(); int run() { if (proc) return -1; proc = new QProcess(); QStringList args; QString programName = "fake.exe"; connect(comp, SIGNAL(started()), this, SLOT(procStarted())); connect(comp, SIGNAL(error(QProcess::ProcessError)), this, SLOT(procError(QProcess::ProcessError))); connect(comp, SIGNAL(finished(int, QProcess::ExitStatus)), this, SLOT(procFinished(int, QProcess::ExitStatus))); proc->start(programName, args); return 0; }; private slots: void procStarted() {}; void procFinished(int, QProcess::ExitStatus) {}; void procError(QProcess::ProcessError); } Since "fake.exe" does not exist on my system, proc emits the error() signal. If I handle it like following, my program crashes: void FakeRunner::procError(QProcess::ProcessError rc) { delete proc; proc = 0; } It works well, though, if I don't delete the pointer. So, the question is how (and when) should I delete the pointer to QProcess? I believe I have to delete it to avoid a memory leak. FakeRunner::run() can be invoked many times, so the leak, if there is one, will grow. Thanks!

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