ChangeLog update from my last commit

[thirdparty/glibc.git] / mach / lock-intern.h

diff --git a/mach/lock-intern.h b/mach/lock-intern.h
index 0a5df7aa09dab97126d51c42278654c74087ddb6..6d9e5e3a2e74973701a644b9183b3f8baeec23a0 100644 (file)
--- a/mach/lock-intern.h
+++ b/mach/lock-intern.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2013 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -13,26 +13,37 @@
 
    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
+   <https://www.gnu.org/licenses/>.  */
 
 #ifndef _LOCK_INTERN_H
 #define        _LOCK_INTERN_H
 
 #include <sys/cdefs.h>
-#include <machine-lock.h>
+#if defined __USE_EXTERN_INLINES && defined _LIBC
+# include <lowlevellock.h>
+#endif
 
 #ifndef _EXTERN_INLINE
 #define _EXTERN_INLINE __extern_inline
 #endif
 
+/* The type of a spin lock variable.  */
+typedef unsigned int __spin_lock_t;
+
+/* Static initializer for spinlocks.  */
+#define __SPIN_LOCK_INITIALIZER   LLL_INITIALIZER
 
 /* Initialize LOCK.  */
 
+extern void __spin_lock_init (__spin_lock_t *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
 _EXTERN_INLINE void
 __spin_lock_init (__spin_lock_t *__lock)
 {
   *__lock = __SPIN_LOCK_INITIALIZER;
 }
+#endif
 
 
 /* Lock LOCK, blocking if we can't get it.  */
@@ -40,57 +51,87 @@ extern void __spin_lock_solid (__spin_lock_t *__lock);
 
 /* Lock the spin lock LOCK.  */
 
+extern void __spin_lock (__spin_lock_t *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
 _EXTERN_INLINE void
 __spin_lock (__spin_lock_t *__lock)
 {
-  if (! __spin_try_lock (__lock))
-    __spin_lock_solid (__lock);
+  lll_lock (__lock, 0);
 }
-\f
-/* Name space-clean internal interface to mutex locks.
+#endif
 
-   Code internal to the C library uses these functions to lock and unlock
-   mutex locks.  These locks are of type `struct mutex', defined in
-   <cthreads.h>.  The functions here are name space-clean.  If the program
-   is linked with the cthreads library, `__mutex_lock_solid' and
-   `__mutex_unlock_solid' will invoke the corresponding cthreads functions
-   to implement real mutex locks.  If not, simple stub versions just use
-   spin locks.  */
+/* Unlock LOCK.  */
+extern void __spin_unlock (__spin_lock_t *__lock);
 
+#if defined __USE_EXTERN_INLINES && defined _LIBC
+_EXTERN_INLINE void
+__spin_unlock (__spin_lock_t *__lock)
+{
+  lll_unlock (__lock, 0);
+}
+#endif
 
-/* Initialize the newly allocated mutex lock LOCK for further use.  */
-extern void __mutex_init (void *__lock);
+/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
+extern int __spin_try_lock (__spin_lock_t *__lock);
 
-/* Lock LOCK, blocking if we can't get it.  */
-extern void __mutex_lock_solid (void *__lock);
+#if defined __USE_EXTERN_INLINES && defined _LIBC
+_EXTERN_INLINE int
+__spin_try_lock (__spin_lock_t *__lock)
+{
+  return (lll_trylock (__lock) == 0);
+}
+#endif
+
+/* Return nonzero if LOCK is locked.  */
+extern int __spin_lock_locked (__spin_lock_t *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
+_EXTERN_INLINE int
+__spin_lock_locked (__spin_lock_t *__lock)
+{
+  return (*(volatile __spin_lock_t *)__lock != 0);
+}
+#endif
+\f
+/* Name space-clean internal interface to mutex locks.  */
 
-/* Finish unlocking LOCK, after the spin lock LOCK->held has already been
-   unlocked.  This function will wake up any thread waiting on LOCK.  */
-extern void __mutex_unlock_solid (void *__lock);
+/* Initialize the newly allocated mutex lock LOCK for further use.  */
+extern void __mutex_init (void *__lock);
 
 /* Lock the mutex lock LOCK.  */
 
+extern void __mutex_lock (void *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
 _EXTERN_INLINE void
 __mutex_lock (void *__lock)
 {
-  if (! __spin_try_lock ((__spin_lock_t *) __lock))
-    __mutex_lock_solid (__lock);
+  __spin_lock ((__spin_lock_t *)__lock);
 }
+#endif
 
 /* Unlock the mutex lock LOCK.  */
 
+extern void __mutex_unlock (void *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
 _EXTERN_INLINE void
 __mutex_unlock (void *__lock)
 {
-  __spin_unlock ((__spin_lock_t *) __lock);
-  __mutex_unlock_solid (__lock);
+  __spin_unlock ((__spin_lock_t *)__lock);
 }
+#endif
 
 
+extern int __mutex_trylock (void *__lock);
+
+#if defined __USE_EXTERN_INLINES && defined _LIBC
 _EXTERN_INLINE int
 __mutex_trylock (void *__lock)
 {
-  return __spin_try_lock ((__spin_lock_t *) __lock);
+  return (__spin_try_lock ((__spin_lock_t *)__lock));
 }
+#endif
 
 #endif /* lock-intern.h */