[patch] add a 'dont_pack_binaries' option to open_port/2 to disable packing small binaries in port_command/2
Fri May 12 07:59:40 CEST 2006
Here is a patch that adds an option to open_port/2 that disables
binaries packing in the implementation of port_command/2.
Packing is normally triggered when more than 16 binaries are
passed in the io-list. In that case, contiguous "small enough"
binaries are copied together into single buffers.
With this patch, when this option is set, packing is never
triggered, ensuring that all binaries are passed by reference
and are never copied.
Preventing packing is necessary when the boundaries between
binaries must be preserved.
This patch is against the otp_src_R10B_2006-02-27 snapshot.
I have no patch for the documentation, but I suggest adding this
comment into the documentation about open_port/2, in
the 'erlang' module documentation:
Prevents packing (copying/grouping of small binaries in
io-lists into larger buffers) in calls to port_command/2.
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