module Netsys_pollset_generic:Returns a good standard implementation of pollset for this platform. It will be good for cases where only a small to medium number of descriptors is watched (several hundred should be ok). It is no problem when the pollset lives only for a short time. Also, it is not strictly necessary to call thesig
..end
dispose
method after use.
On POSIX platforms, this returns a
Netsys_pollset_posix.poll_based_pollset
.
On Win32, this returns Netsys_pollset_win32.pollset
in single-threaded
programs, and a Netsys_pollset_win32.threaded_pollset
in
multi-threaded programs. Note that Win32 restricts the number of
descriptors that can be watched per thread to 64. The threaded_pollset
version overcomes this limit, but it is only available if your
program is compiled for multi-threading. Because of this, it may be
useful to enable multi-threading for your program even when your code
does not make use of it otherwise.
val standard_pollset : unit -> Netsys_pollset.pollset
dispose
method after use.
On POSIX platforms, this returns a
Netsys_pollset_posix.poll_based_pollset
.
On Win32, this returns Netsys_pollset_win32.pollset
in single-threaded
programs, and a Netsys_pollset_win32.threaded_pollset
in
multi-threaded programs. Note that Win32 restricts the number of
descriptors that can be watched per thread to 64. The threaded_pollset
version overcomes this limit, but it is only available if your
program is compiled for multi-threading. Because of this, it may be
useful to enable multi-threading for your program even when your code
does not make use of it otherwise.
val performance_pollset : unit -> Netsys_pollset.pollset
dispose
method is called after use.
On some POSIX platforms this is backed by
Netsys_pollset_posix.accelerated_pollset
. See the documentation
there for possible problems. If no better implementation is available,
this is the same as standard_pollset
.
val select_emulation : Netsys_pollset.pollset ->
Unix.file_descr list ->
Unix.file_descr list ->
Unix.file_descr list ->
float -> Unix.file_descr list * Unix.file_descr list * Unix.file_descr list
let select = select_emulation pset
: Returns a function with the
same meaning as Unix.select
. It is emulated on top of pset
.
Using the function is only recommended when the lists of file descriptors are short. Long lists impose a big performance penalty.
Unlike Unix.select
the descriptors may be returned in any order.