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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /erts/include/internal/sparc32/spinlock.h
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The R13B03 release.OTP_R13B03
Diffstat (limited to 'erts/include/internal/sparc32/spinlock.h')
-rw-r--r--erts/include/internal/sparc32/spinlock.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/erts/include/internal/sparc32/spinlock.h b/erts/include/internal/sparc32/spinlock.h
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2005-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * Native ethread spinlocks on SPARC V9.
+ * Author: Mikael Pettersson.
+ */
+#ifndef ETHR_SPARC32_SPINLOCK_H
+#define ETHR_SPARC32_SPINLOCK_H
+
+/* Locked with ldstub, so unlocked when 0 and locked when non-zero. */
+typedef struct {
+ volatile unsigned char lock;
+} ethr_native_spinlock_t;
+
+#ifdef ETHR_TRY_INLINE_FUNCS
+
+static ETHR_INLINE void
+ethr_native_spinlock_init(ethr_native_spinlock_t *lock)
+{
+ lock->lock = 0;
+}
+
+static ETHR_INLINE void
+ethr_native_spin_unlock(ethr_native_spinlock_t *lock)
+{
+ __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ lock->lock = 0;
+}
+
+static ETHR_INLINE int
+ethr_native_spin_trylock(ethr_native_spinlock_t *lock)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__(
+ "ldstub [%1], %0\n\t"
+ "membar #StoreLoad|#StoreStore"
+ : "=r"(prev)
+ : "r"(&lock->lock)
+ : "memory");
+ return prev == 0;
+}
+
+static ETHR_INLINE int
+ethr_native_spin_is_locked(ethr_native_spinlock_t *lock)
+{
+ return lock->lock != 0;
+}
+
+static ETHR_INLINE void
+ethr_native_spin_lock(ethr_native_spinlock_t *lock)
+{
+ for(;;) {
+ if (__builtin_expect(ethr_native_spin_trylock(lock) != 0, 1))
+ break;
+ do {
+ __asm__ __volatile__("membar #LoadLoad");
+ } while (ethr_native_spin_is_locked(lock));
+ }
+}
+
+#endif /* ETHR_TRY_INLINE_FUNCS */
+
+#endif /* ETHR_SPARC32_SPINLOCK_H */