I want to use/ subscribe a to a pub-socket on a server that implements ZeroMQ ( ) There is no operating system/kernel level indication that will give you any kind of a guarantee as to the amount of a send() or write() call on a socket will accept. You will need to figure out which logic/algorithm based solution will work best for your specific program. The number of possible, alternative solutions has no limit. This would avoid having all execution thread wedged by a hung socket, at expense of grown memory, that's holding all unsent data.īut that's just one possible approach. Just one possibility would be a dedicated execution thread that handles all socket input/output, and all your other execution threads sending their messages to the socket thread, instead of writing to the socket directly. Each eventual solution needs to be tailored based on each program's unique requirements and purpose. There is no single, cookie-cutter, paint-by-numbers, solution to this that works in every situation, in every program, that needs to do something like this. It goes without sending that this leaves open a possibility that a blocked/hung socket will result in a single thread locking this mutex for an excessive amount of time, until the socket times out and your execution thread ends up dealing with a failed send() or write(), in whatever fashion it is already doing now (you are, of course, checking the return value from send/write, and handling the exception conditions appropriately).
It will be necessary to handle the synchronization at this level, by employing a mutex that each thread locks before sending its message and unlocking it only after the entire message is sent. Sent to the same socket by different threads Not only there's a chance of that, it is pretty much going to be a certainty, at one point or another.
But, my worry is that beacuse Tcp is a stream the client will receive fragments of each message and I was thinking that adding framing to each message I could rebuild the message on the client side, if I knew how many bytes are sent at a time.Īlthough the call to ::send() is done sequentially, is the any chance that the byte stream is still mixed?Īlthough the call to ::send() is done sequentially, is the any chance that The loop is mutexed so can be seen as thread safe, so each thread has to perform the sending after the other.
Thus, go with the loop solution until all the bytes are sent. In some cases where messages are large multiple calls to ::send() are required as not all the bytes are sent at the initial call. Is there any way to know exactly how many bytes can be sent before sending? If the socket will allow for the entire message, or that the message will be fragmented and by how much?Ģ messages are sent to the same socket by different threads at the same time on the same tcp client via ::send(). ) where sent_bytes is only 256 bytes so this needs to be called again. I'm aware that the ::send within a Linux TCP server can limit the sending of the payload such that ::send needs to be called multiple times until the entire payload is sent. b) -txt-subst-file=strings.txt /tmp/netscreen1.cfg. Note that the script tries to handle network addresses so that network address and netmask (both given in notation as well as a.b.c.d/xy notation) will match by simply setting all netmasks to /32. Using an RFC1918 private address range is a good idea. The second argument is a network address, which should be given in CIDR notation, and really represents a range of IP addresses from which we can draw from while doing the IP address substitutions (Note that the use of NetAddr::IP means that we will never overflow this range - but it will wrap around if we increment it enough). This way you can protect an organization's identity at the same time. from firewalls but do not want to expose the production data on a test system. This is useful if you need to use production configuration data for testing. Input is a number of ASCII files (all parameters not starting with -) IP addresses as well as strings are replaced one-for-one throughout all text files, so once an IP address has an anonymized equivalent, it stays that way. b) replacing strings in a file with anonymized strings. a) replacing IP addresses in plain text with anonymized equivalents from the network range supplied. replace IP addresses with anonymized IPs as well as text with anonymized text in plain text files.
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