config/thread: Use config'd per-thread stack size

Issue: 4550

This commit checks if there's a config setting for threading.stack-size
and assigns the value to a global variable for use during thread
creation.

(cherry picked from commit e4d60f451b)

src/runmodes.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2007-2013 Open Information Security Foundation
+/* Copyright (C) 2007-2022 Open Information Security Foundation
  *
  * You can copy, redistribute or modify this Program under the terms of
  * the GNU General Public License version 2 as published by the Free
@@ -59,6 +59,7 @@
 
 int debuglog_enabled = 0;
 int threading_set_cpu_affinity = FALSE;
+uint64_t threading_set_stack_size = 0;
 
 /* Runmode Global Thread Names */
 const char *thread_name_autofp = "RX";
@@ -935,4 +936,20 @@ void RunModeInitialize(void)
     }
 
     SCLogDebug("threading.detect-thread-ratio %f", threading_detect_ratio);
+
+    /*
+     * Check if there's a configuration setting for the per-thread stack size
+     * in case the default per-thread stack size is to be adjusted
+     */
+    const char *ss = NULL;
+    if ((ConfGetValue("threading.stack-size", &ss)) == 1) {
+        if (ss != NULL) {
+            if (ParseSizeStringU64(ss, &threading_set_stack_size) < 0) {
+                FatalError(SC_ERR_INVALID_ARGUMENT,
+                        "Failed to initialize thread_stack_size output, invalid limit: %s", ss);
+            }
+        }
+    }
+
+    SCLogDebug("threading.stack-size %" PRIu64, threading_set_stack_size);
 }

src/runmodes.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2007-2013 Open Information Security Foundation
+/* Copyright (C) 2007-2022 Open Information Security Foundation
  *
  * You can copy, redistribute or modify this Program under the terms of
  * the GNU General Public License version 2 as published by the Free
@@ -113,6 +113,7 @@ int RunModeNeedsBypassManager(void);
 
 extern int threading_set_cpu_affinity;
 extern float threading_detect_ratio;
+extern uint64_t threading_set_stack_size;
 
 extern int debuglog_enabled;