From d0e30d8d70931ff0ba2d936ba35996e2f4e62ee5 Mon Sep 17 00:00:00 2001
From: Garrett D'Amore <garrett@damore.org>
Date: Fri, 29 Dec 2023 19:09:24 -0800
Subject: provide NNG_MAX_POLLER_THREADS

This (defaults to 8) sets a limit on the number of poller threads
that will be used for servicing I/Os.  This is the size of the
I/O completion port thread pool on Windows.  POSIX pollers are generally
not concurrent at present.
---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04cc14de..226bb2eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -138,6 +138,14 @@ if (NNG_MAX_EXPIRE_THREADS)
     add_definitions(-DNNG_MAX_EXPIRE_THREADS=${NNG_MAX_EXPIRE_THREADS})
 endif()
 
+# Poller threads.  These threads run the pollers.  This is mostly used
+# on Windows right now, as the POSIX platforms use a single threaded poller.
+set(NNG_MAX_POLLER_THREADS 8 CACHE STRING "Upper bound on I/O poller threads, 0 for no limit")
+mark_as_advanced(NNG_MAX_POLLER_THREADS)
+if (NNG_MAX_POLLER_THREADS)
+    add_definitions(-DNNG_MAX_POLLER_THREADS=${NNG_MAX_POLLER_THREADS})
+endif()
+
 #  Platform checks.
 
 if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
-- 
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