Messages in this thread | | | Subject | send(), sendmsg(), sendto() not thread-safe | From | Mark A Smith <> | Date | Mon, 15 May 2006 14:39:06 -0700 |
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I discovered that in some cases, send(), sendmsg(), and sendto() are not thread-safe. Although the man page for these functions does not specify whether these functions are supposed to be thread-safe, my reading of the POSIX/SUSv3 specification tells me that they should be. I traced the problem to tcp_sendmsg(). I was very curious about this issue, so I wrote up a small page to describe in more detail my findings. You can find it at: http://www.almaden.ibm.com/cs/people/marksmith/sendmsg.html .
Thanks, Mark A. Smith
PS. I am using the term "thread" in the general sense, this is a problem independent of pthreads, etc. The problem occurs when two processes (whether or not they share an address space) send on the same socket (and some other low-resource conditions exist).
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