From 7c96d6059c81b15916112ecafbb3a6bcd81a3271 Mon Sep 17 00:00:00 2001 From: Corinna Vinschen Date: Fri, 18 Mar 2016 14:40:26 +0100 Subject: [PATCH] Arc4random locking: Check for threaded application on Cygwin libc/stdlib/arc4random.h (_ARC4_LOCK): Special case Cygwin. (_ARC4_UNLOCK): Ditto. Signed-off-by: Corinna Vinschen --- newlib/libc/stdlib/arc4random.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/newlib/libc/stdlib/arc4random.h b/newlib/libc/stdlib/arc4random.h index 938a80b2e..8bb72f40e 100644 --- a/newlib/libc/stdlib/arc4random.h +++ b/newlib/libc/stdlib/arc4random.h @@ -39,10 +39,29 @@ __LOCK_INIT(static, _arc4random_mutex); +#ifdef __CYGWIN__ + +extern int __isthreaded; + +#define _ARC4_LOCK() \ + do { \ + if (__isthreaded) \ + __lock_acquire (_arc4random_mutex); \ + } while (0) + +#define _ARC4_UNLOCK() \ + do { \ + if (__isthreaded) \ + __lock_release (_arc4random_mutex); \ + } while (0) +#else + #define _ARC4_LOCK() __lock_acquire(_arc4random_mutex) #define _ARC4_UNLOCK() __lock_release(_arc4random_mutex) +#endif + #ifdef _ARC4RANDOM_DATA _ARC4RANDOM_DATA #else