From 0294603dfc23128e02b8b60f5e3c07db6107a057 Mon Sep 17 00:00:00 2001
From: Sergey Lyubka <valenok@gmail.com>
Date: Thu, 12 May 2022 15:07:02 +0100
Subject: [PATCH] MG_ARCH_RTX nits

---
 docs/README.md | 5 +++++
 mongoose.c     | 3 ++-
 mongoose.h     | 4 +++-
 src/arch_rtx.h | 2 ++
 src/config.h   | 2 +-
 src/sock.c     | 3 ++-
 6 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/docs/README.md b/docs/README.md
index 6f12e60e..7334f68c 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -244,6 +244,11 @@ struct mg_connection {
   mg_http_printf_chunk(c, "%s", "bar");
   mg_http_printf_chunk(c, "");  // Don't forget the last empty chunk
   ```
+- On embedded environment, make sure that serving task has enough stack:
+  give it 2k for simple RESTful serving, or 4-8k for complex dynamic/static
+  serving. In certain environments, it is necessary to adjust heap size, too.
+  By default, IO buffer allocation size `MG_IO_SIZE` is 2048: change it to 512
+  to trim run-time per-connection memory consumption.
 
 ## Build options
 
diff --git a/mongoose.c b/mongoose.c
index 36e52c03..6927bc55 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -3543,7 +3543,8 @@ static bool mg_socketpair(SOCKET sp[2], union usa usa[2]) {
   usa[1] = usa[0];
 
   if ((sock = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
-      bind(sock, &usa[0].sa, len) == 0 && listen(sock, 3) == 0 &&
+      bind(sock, &usa[0].sa, len) == 0 &&
+      listen(sock, MG_SOCK_LISTEN_BACKLOG_SIZE) == 0 &&
       getsockname(sock, &usa[0].sa, &len) == 0 &&
       (sp[0] = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
       connect(sp[0], &usa[0].sa, len) == 0 &&
diff --git a/mongoose.h b/mongoose.h
index cf36714d..4a3ab101 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -335,6 +335,8 @@ struct timeval {
 
 #include <rl_net.h>
 
+#define MG_IO_SIZE 512
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 1
 #define MG_ENABLE_CUSTOM_MILLIS 1
 typedef int socklen_t;
 #define closesocket(x) closesocket(x)
@@ -629,7 +631,7 @@ int sscanf(const char *, const char *, ...);
 #endif
 
 #ifndef MG_SOCK_LISTEN_BACKLOG_SIZE
-#define MG_SOCK_LISTEN_BACKLOG_SIZE 128
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 3
 #endif
 
 #ifndef MG_DIRSEP
diff --git a/src/arch_rtx.h b/src/arch_rtx.h
index 8b7dfbc5..6c53f529 100644
--- a/src/arch_rtx.h
+++ b/src/arch_rtx.h
@@ -15,6 +15,8 @@
 
 #include <rl_net.h>
 
+#define MG_IO_SIZE 512
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 1
 #define MG_ENABLE_CUSTOM_MILLIS 1
 typedef int socklen_t;
 #define closesocket(x) closesocket(x)
diff --git a/src/config.h b/src/config.h
index 49074dae..e4a69758 100644
--- a/src/config.h
+++ b/src/config.h
@@ -80,7 +80,7 @@
 #endif
 
 #ifndef MG_SOCK_LISTEN_BACKLOG_SIZE
-#define MG_SOCK_LISTEN_BACKLOG_SIZE 128
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 3
 #endif
 
 #ifndef MG_DIRSEP
diff --git a/src/sock.c b/src/sock.c
index 8de82d75..6bc7d974 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -406,7 +406,8 @@ static bool mg_socketpair(SOCKET sp[2], union usa usa[2]) {
   usa[1] = usa[0];
 
   if ((sock = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
-      bind(sock, &usa[0].sa, len) == 0 && listen(sock, 3) == 0 &&
+      bind(sock, &usa[0].sa, len) == 0 &&
+      listen(sock, MG_SOCK_LISTEN_BACKLOG_SIZE) == 0 &&
       getsockname(sock, &usa[0].sa, &len) == 0 &&
       (sp[0] = socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET &&
       connect(sp[0], &usa[0].sa, len) == 0 &&