[newlib-cygwin] RTEMS: Optimize pthread_once_t

[newlib-cygwin] RTEMS: Optimize pthread_once_t

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4fef7312b31bed6c77add331805f5212551c54cd

commit 4fef7312b31bed6c77add331805f5212551c54cd
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Tue Sep 19 15:08:35 2017 +0200

    RTEMS: Optimize pthread_once_t
    
    Reduce size of pthread_once_t and make it zero-initialized.
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/sys/rtems/include/machine/_threads.h  | 5 ++---
 newlib/libc/sys/rtems/include/sys/_pthreadtypes.h | 8 ++++----
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/newlib/libc/sys/rtems/include/machine/_threads.h b/newlib/libc/sys/rtems/include/machine/_threads.h
index 24db21c..5faa78f 100644
--- a/newlib/libc/sys/rtems/include/machine/_threads.h
+++ b/newlib/libc/sys/rtems/include/machine/_threads.h
@@ -41,12 +41,11 @@ typedef __uint32_t tss_t;
 
 /* pthread_once_t */
 typedef struct {
-	int	_is_initialized;
-	int	_init_executed;
+	unsigned char _flags;
 } once_flag;
 
 /* PTHREAD_ONCE_INIT */
-#define	ONCE_FLAG_INIT { 1, 0 }
+#define	ONCE_FLAG_INIT { 0 }
 
 /* PTHREAD_DESTRUCTOR_ITERATIONS */
 #define	TSS_DTOR_ITERATIONS 4
diff --git a/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h b/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
index bd66c68..9db50fe 100644
--- a/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
+++ b/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
@@ -169,11 +169,11 @@ typedef struct {
 typedef __uint32_t pthread_key_t;        /* thread-specific data keys */
 
 typedef struct {
-  int   is_initialized;  /* is this structure initialized? */
-  int   init_executed;   /* has the initialization routine been run? */
-} pthread_once_t;       /* dynamic package initialization */
+  unsigned char _flags;
+} pthread_once_t;
+
+#define _PTHREAD_ONCE_INIT { 0 }
 
-#define _PTHREAD_ONCE_INIT  { 1, 0 }  /* is initialized and not run */
 #endif /* defined(_POSIX_THREADS) */
 
 /* POSIX Barrier Types */