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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 10 Jan 2011 16:10:25 +0000 (UTC)
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Subject: svn commit: r217224 - head/lib/libthr/thread
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Author: kib
Date: Mon Jan 10 16:10:25 2011
New Revision: 217224
URL: http://svn.freebsd.org/changeset/base/217224

Log:
  For the process that already loaded libthr but still not initialized
  threading, fall back to libc method of performing
  __pthread_map_stacks_exec() job.
  
  Reported and tested by:	Mykola Dzham <i levsha me>

Modified:
  head/lib/libthr/thread/thr_stack.c

Modified: head/lib/libthr/thread/thr_stack.c
==============================================================================
--- head/lib/libthr/thread/thr_stack.c	Mon Jan 10 16:09:35 2011	(r217223)
+++ head/lib/libthr/thread/thr_stack.c	Mon Jan 10 16:10:25 2011	(r217224)
@@ -30,6 +30,8 @@
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <sys/queue.h>
+#include <sys/resource.h>
+#include <sys/sysctl.h>
 #include <stdlib.h>
 #include <pthread.h>
 #include <link.h>
@@ -139,6 +141,26 @@ _thr_stack_fix_protection(struct pthread
 	    _rtld_get_stack_prot());
 }
 
+static void
+singlethread_map_stacks_exec(void)
+{
+	int mib[2];
+	struct rlimit rlim;
+	u_long usrstack;
+	size_t len;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_USRSTACK;
+	len = sizeof(usrstack);
+	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0)
+	    == -1)
+		return;
+	if (getrlimit(RLIMIT_STACK, &rlim) == -1)
+		return;
+	mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur),
+	    rlim.rlim_cur, _rtld_get_stack_prot());
+}
+
 void __pthread_map_stacks_exec(void);
 void
 __pthread_map_stacks_exec(void)
@@ -146,6 +168,10 @@ __pthread_map_stacks_exec(void)
 	struct pthread *curthread, *thrd;
 	struct stack *st;
 
+	if (!_thr_is_inited()) {
+		singlethread_map_stacks_exec();
+		return;
+	}
 	curthread = _get_curthread();
 	THREAD_LIST_RDLOCK(curthread);
 	LIST_FOREACH(st, &mstackq, qe)