X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=libjava%2Fsysdep%2Fi386%2Flocks.h;fp=libjava%2Fsysdep%2Fi386%2Flocks.h;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=a9501ae99b23729584bef89a2fdd62f99bbe1a3d;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/libjava/sysdep/i386/locks.h b/libjava/sysdep/i386/locks.h deleted file mode 100644 index a9501ae9..00000000 --- a/libjava/sysdep/i386/locks.h +++ /dev/null @@ -1,73 +0,0 @@ -// locks.h - Thread synchronization primitives. X86 implementation. - -/* Copyright (C) 2002 Free Software Foundation - - This file is part of libgcj. - -This software is copyrighted work licensed under the terms of the -Libgcj License. Please consult the file "LIBGCJ_LICENSE" for -details. */ - -#ifndef __SYSDEP_LOCKS_H__ -#define __SYSDEP_LOCKS_H__ - -typedef size_t obj_addr_t; /* Integer type big enough for object */ - /* address. */ - -// Atomically replace *addr by new_val if it was initially equal to old. -// Return true if the comparison succeeded. -// Assumed to have acquire semantics, i.e. later memory operations -// cannot execute before the compare_and_swap finishes. -inline static bool -compare_and_swap(volatile obj_addr_t *addr, - obj_addr_t old, - obj_addr_t new_val) -{ - char result; - __asm__ __volatile__("lock; cmpxchgl %2, %0; setz %1" - : "+m"(*(addr)), "=q"(result) - : "r" (new_val), "a"(old) - : "memory"); - return (bool) result; -} - -// Set *addr to new_val with release semantics, i.e. making sure -// that prior loads and stores complete before this -// assignment. -// On X86, the hardware shouldn't reorder reads and writes, -// so we just have to convince gcc not to do it either. -inline static void -release_set(volatile obj_addr_t *addr, obj_addr_t new_val) -{ - __asm__ __volatile__(" " : : : "memory"); - *(addr) = new_val; -} - -// Compare_and_swap with release semantics instead of acquire semantics. -// On many architecture, the operation makes both guarantees, so the -// implementation can be the same. -inline static bool -compare_and_swap_release(volatile obj_addr_t *addr, - obj_addr_t old, - obj_addr_t new_val) -{ - return compare_and_swap(addr, old, new_val); -} - -// Ensure that subsequent instructions do not execute on stale -// data that was loaded from memory before the barrier. -// On X86, the hardware ensures that reads are properly ordered. -inline static void -read_barrier() -{ -} - -// Ensure that prior stores to memory are completed with respect to other -// processors. -inline static void -write_barrier() -{ - // X86 does not reorder writes. We just need to ensure that gcc also doesn't. - __asm__ __volatile__(" " : : : "memory"); -} -#endif