From 9cb3300d8873288618caa26042799d0bbbdfce49 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Sat, 16 Aug 2014 08:38:53 +0000
Subject: MFC r269909: Add a knob LIBPTHREAD_BIGSTACK_MAIN, which instructs
 libthr to leave the whole RLIMIT_STACK-sized region of the kernel-allocated
 stack as the stack of main thread.

---
 lib/libthr/thread/thr_init.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib/libthr/thread/thr_init.c')

diff --git a/lib/libthr/thread/thr_init.c b/lib/libthr/thread/thr_init.c
index 937d83f..9bf0e29 100644
--- a/lib/libthr/thread/thr_init.c
+++ b/lib/libthr/thread/thr_init.c
@@ -37,6 +37,7 @@
 #include <sys/types.h>
 #include <sys/signalvar.h>
 #include <sys/ioctl.h>
+#include <sys/resource.h>
 #include <sys/sysctl.h>
 #include <sys/ttycom.h>
 #include <sys/mman.h>
@@ -441,6 +442,7 @@ init_main_thread(struct pthread *thread)
 static void
 init_private(void)
 {
+	struct rlimit rlim;
 	size_t len;
 	int mib[2];
 	char *env;
@@ -471,6 +473,12 @@ init_private(void)
 		len = sizeof (_usrstack);
 		if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
 			PANIC("Cannot get kern.usrstack from sysctl");
+		env = getenv("LIBPTHREAD_BIGSTACK_MAIN");
+		if (env != NULL) {
+			if (getrlimit(RLIMIT_STACK, &rlim) == -1)
+				PANIC("Cannot get stack rlimit");
+			_thr_stack_initial = rlim.rlim_cur;
+		}
 		len = sizeof(_thr_is_smp);
 		sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0);
 		_thr_is_smp = (_thr_is_smp > 1);
-- 
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