Libc-997.1.1.tar.gz

[apple/libc.git] / darwin / SpinlocksLoadStoreEx.c

diff --git a/darwin/SpinlocksLoadStoreEx.c b/darwin/SpinlocksLoadStoreEx.c
deleted file mode 100644 (file)
index a991ba0..0000000
--- a/darwin/SpinlocksLoadStoreEx.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
- * Copyright (c) 2011 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-// OSAtomic.h is included by files that include this C file.
-/* #include "OSAtomic.h" */
-
-typedef int32_t OSSpinLock;
-
-/*
- * Bear with me, there's method to this madness. clang actually produces more optimal
- * fastpath code if the lock code is split in half like this.
- *
- * Once we're spinning in userspace/kernel like this then we can be more lenient about
- * how much effort is spent doing the spin. Where the lock is uncontended, this split
- * arrangement produces a very good fastpath at the cost of some code duplication.
- *
- * Similarly, the gotos produce less wasteful code during spins then the equivalent code
- * defined with loops.
- */
-
-#import <mach/mach_traps.h>
-
-static inline void _OSSpinLockSlow(volatile OSSpinLock * lock) _OSATOMIC_VARIANT(_OSSpinLockSlow);
-static inline void _OSSpinLockSlow(volatile OSSpinLock * lock)
-{
-       int32_t r;
-       uint32_t t;
-
-_spin: ;
-#if (defined(_ARM_ARCH_7) && !defined(_OSATOMIC_NO_BARRIERS))
-       uint32_t tries = MP_SPIN_TRIES;
-       do {
-               if (*lock == 0) goto _try_store;
-               _osatomic_pause();
-       } while (--tries);
-#endif
-
-       __asm__ ("mov   r0, %[_a] ;"
-                        "mov   r1, %[_b] ;"
-                        "mov   r2, %[_c] ;"
-                        "bl    _syscall_thread_switch ;"
-                        : : [_a] "i" (0), [_b] "i" (1), [_c] "i" (1)
-                        : "r0", "r1", "r2", "r9", "r12", "lr" );
-
-_try_store:
-       do {
-               _osatomic_load_exclusive(lock, r);
-               if (slowpath(r)) goto _spin;
-               _osatomic_store_exclusive(lock, 1, t);
-       } while (slowpath(t));
-
-       _osatomic_barrier();
-}
-
-void OSSpinLockLock(volatile OSSpinLock * lock) _OSATOMIC_VARIANT(OSSpinLockLock);
-void OSSpinLockLock(volatile OSSpinLock * lock)
-{
-       _OSATOMIC_ALIAS(spin_lock, OSSpinLockLock);
-       _OSATOMIC_ALIAS(_spin_lock, OSSpinLockLock);
-
-       int32_t r;
-       uint32_t t;
-
-       do {
-               _osatomic_load_exclusive(lock, r);
-               if (slowpath(r)) return _OSSpinLockSlow(lock);
-               _osatomic_store_exclusive(lock, 1, t);
-       } while (slowpath(t));
-
-       _osatomic_barrier();
-}
-
-#ifndef _OSATOMIC_WFE
-
-bool OSSpinLockTry(OSSpinLock * lock) _OSATOMIC_VARIANT(OSSpinLockTry);
-bool OSSpinLockTry(OSSpinLock * lock)
-{
-       _OSATOMIC_ALIAS(spin_lock_try, OSSpinLockTry);
-       _OSATOMIC_ALIAS(_spin_lock_try, OSSpinLockTry);
-
-       int32_t r;
-       uint32_t t;
-
-       do {
-               _osatomic_load_exclusive(lock, r);
-               if (slowpath(r)) return false;
-               _osatomic_store_exclusive(lock, 1, t);
-       } while (slowpath(t));
-
-       _osatomic_barrier();
-       return (r == 0);
-}
-
-void OSSpinLockUnlock(OSSpinLock * lock) _OSATOMIC_VARIANT(OSSpinLockUnlock);
-void OSSpinLockUnlock(OSSpinLock * lock)
-{
-       _OSATOMIC_ALIAS(spin_unlock, OSSpinLockUnlock);
-       _OSATOMIC_ALIAS(_spin_unlock, OSSpinLockUnlock);
-
-       _osatomic_barrier();
-       *lock = 0;
-}
-
-#endif // _OSATOMIC_WFE