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Full Discussion: Writing a REST server to run on FreeBSD -- how to structure for concurrency?
Top Forums UNIX for Advanced & Expert Users Writing a REST server to run on FreeBSD -- how to structure for concurrency? Post 302981454 by Corona688 on Tuesday 13th of September 2016 11:31:22 AM
Old 09-13-2016
Shared memory can happen in IPC, too. What isn't shared between processes is file/socket handles. Theoretically, you can copy a file handle from one process to another, but the procedure for doing so without resorting to fork() makes me smell burnt toast... Threads of course don't have this problem, they share everything.

IPC is also a can of worms in some ways, their synchronization primitives have read/write bits just like files do, if you're not building your own private client/server model they can be more complicated than needed.
 

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LEARN ABOUT HPUX

shmem

shmem(5)							File Formats Manual							  shmem(5)

NAME

       shmem - enable or disable System V shared memory

DESCRIPTION

       The tunable is obsolete.  The System V IPC shared memory subsystem is always enabled.

       Shared  memory is an efficient InterProcess Communications (IPC) mechanism.  One process creates a shared memory segment and attaches it to
       its address space.  Any processes looking to communicate with this process through the shared memory segment, then attach the shared memory
       segment	to  their  corresponding  address spaces as well.  Once attached, a process can read from or write to the segment depending on the
       permissions specified while attaching it.

WARNINGS

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       shmmax(5), shmmni(5), shmseg(5).

							     Tunable Kernel Parameters							  shmem(5)
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