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Published on 2010-04-02T18:29:37Z
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2010/04/02
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You know we can use message queues with the function mq_receive(); what is a good way to implement that functionality (you know, waiting until the shared data is changed) with semaphores?
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I'd like to know if there's a way to get the number of seconds since the UNIX epoch in any POSIX compliant shell, without resorting to non-POSIX languages like perl, or using non-POSIX extensions like GNU awk's strftime function.
Here are some solutions I've already ruled out...
date +%s //…
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Under Ubuntu 8.10, bash shell, the LANG and LC_ALL variables are not set:
user@machine1:~$ locale
LANG=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
Where…
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posix does not appear when I run php -m cmd, however, I see it from the phpinfo() –enable-posix=shared on Linux with Plesk 9.
Basically, I can't use posix_*() functions as described at
http://www.php.net/manual/en/ref.posix.php
this shows doesn't exists:
if (function_exists(‘posix_getuid’)) {
echo…
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In a linux application I'm using pipes to pass information between threads.
The idea behind using pipes is that I can wait for multiple pipes at once using poll(2). That works well in practice, and my threads are sleeping most of the time and only wake up if there is something to do for them.
On…
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Hi
Do you know about any good library wrapping posix and linux functions and structures ( eg. sockets or file descriptors ) into C++ classes? For example I'm thinking about a base FileDescriptor class and some inheriting classes ( unix sockets etc ) with methods like write, read or even some syscalls…
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