- make arc4random*() functions thread safe. Use a custom spinlock function

instead of the generic pthread macros since free(3) uses __arc4_getbyte()
when freeing small sized allocations and the generic pthread macros call
malloc(3).
- eliminate passing pointers to a static variable with global scope (rs)
for additional code clarity and reduction.
- shlib minor bumps for libc and libpthread due to new functions.
From andreas@ with some bits from me. okay tedu@ marc@ w/some spot
checking from millert@

1 files changed, 18 insertions, 1 deletions

diff --git a/lib/librthread/rthread_libc.c b/lib/librthread/rthread_libc.c
index bf3c057d874..da0d92f8da5 100644
--- a/lib/librthread/rthread_libc.c
+++ b/lib/librthread/rthread_libc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rthread_libc.c,v 1.4 2007/06/05 18:11:49 kurt Exp $ */
+/* $OpenBSD: rthread_libc.c,v 1.5 2008/01/01 00:43:39 kurt Exp $ */
 /* $snafu: libc_tag.c,v 1.4 2004/11/30 07:00:06 marc Exp $ */
 
 /* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
@@ -175,6 +175,23 @@ _thread_malloc_init(void)
 {
 }
 
+/*
+ * arc4random lock
+ */
+static _spinlock_lock_t arc4_lock = _SPINLOCK_UNLOCKED;
+
+void
+_thread_arc4_lock(void)
+{
+	_spinlock(&arc4_lock);
+}
+
+void
+_thread_arc4_unlock(void)
+{
+	_spinunlock(&arc4_lock);
+}
+
 #if 0
 /*
  * miscellaneous libc exported symbols we want to override