70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
// locks.h - Thread synchronization primitives. Alpha implementation.
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/* Copyright (C) 2002 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#ifndef __SYSDEP_LOCKS_H__
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#define __SYSDEP_LOCKS_H__
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typedef size_t obj_addr_t; /* Integer type big enough for object */
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/* address. */
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inline static bool
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compare_and_swap(volatile obj_addr_t *addr,
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obj_addr_t old,
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obj_addr_t new_val)
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{
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unsigned long oldval;
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char result;
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__asm__ __volatile__(
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"1:ldq_l %0, %1\n\t" \
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"cmpeq %0, %5, %2\n\t" \
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"beq %2, 2f\n\t" \
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"mov %3, %0\n\t" \
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"stq_c %0, %1\n\t" \
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"bne %0, 2f\n\t" \
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"br 1b\n\t" \
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"2:mb"
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: "=&r"(oldval), "=m"(*addr), "=&r"(result)
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: "r" (new_val), "m"(*addr), "r"(old) : "memory");
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return (bool) result;
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}
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inline static void
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release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
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{
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__asm__ __volatile__("mb" : : : "memory");
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*(addr) = new_val;
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}
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inline static bool
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compare_and_swap_release(volatile obj_addr_t *addr,
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obj_addr_t old,
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obj_addr_t new_val)
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{
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return compare_and_swap(addr, old, new_val);
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}
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// Ensure that subsequent instructions do not execute on stale
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// data that was loaded from memory before the barrier.
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inline static void
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read_barrier()
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{
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__asm__ __volatile__("mb" : : : "memory");
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}
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// Ensure that prior stores to memory are completed with respect to other
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// processors.
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inline static void
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write_barrier()
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{
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__asm__ __volatile__("wmb" : : : "memory");
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}
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#endif
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