diff --git a/libjava/sysdep/alpha/locks.h b/libjava/sysdep/alpha/locks.h new file mode 100644 index 00000000000..1c20249cce3 --- /dev/null +++ b/libjava/sysdep/alpha/locks.h @@ -0,0 +1,53 @@ +// locks.h - Thread synchronization primitives. Alpha 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. */ + +inline static bool +compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + unsigned long oldval; + char result; + __asm__ __volatile__( + "1:ldq_l %0, %1\n\t" \ + "cmpeq %0, %5, %2\n\t" \ + "beq %2, 2f\n\t" \ + "mov %3, %0\n\t" \ + "stq_c %0, %1\n\t" \ + "bne %0, 2f\n\t" \ + "br 1b\n\t" \ + "2:mb" + : "=&r"(oldval), "=m"(*addr), "=&r"(result) + : "r" (new_val), "m"(*addr), "r"(old) : "memory"); + return (bool) result; +} + +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__("mb" : : : "memory"); + *(addr) = new_val; +} + +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); +} + +#endif diff --git a/libjava/sysdep/generic/locks.h b/libjava/sysdep/generic/locks.h new file mode 100644 index 00000000000..fce6c71669e --- /dev/null +++ b/libjava/sysdep/generic/locks.h @@ -0,0 +1,11 @@ +// locks.h - Thread synchronization primitives. Generic 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. */ + +#error Thread synchronization primitives not implemented for this platform. diff --git a/libjava/sysdep/i386/locks.h b/libjava/sysdep/i386/locks.h new file mode 100644 index 00000000000..0c029ac939a --- /dev/null +++ b/libjava/sysdep/i386/locks.h @@ -0,0 +1,65 @@ +// 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() +{ +} + +#endif diff --git a/libjava/sysdep/ia64/locks.h b/libjava/sysdep/ia64/locks.h new file mode 100644 index 00000000000..6edee83ea99 --- /dev/null +++ b/libjava/sysdep/ia64/locks.h @@ -0,0 +1,50 @@ +// locks.h - Thread synchronization primitives. IA64 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. */ + +inline static bool +compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + unsigned long oldval; + __asm__ __volatile__("mov ar.ccv=%4 ;; cmpxchg8.acq %0=%1,%2,ar.ccv" + : "=r"(oldval), "=m"(*addr) + : "r"(new_val), "1"(*addr), "r"(old) : "memory"); + return (oldval == old); +} + +// The fact that *addr is volatile should cause the compiler to +// automatically generate an st8.rel. +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__(" " : : : "memory"); + *(addr) = new_val; +} + +inline static bool +compare_and_swap_release(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + unsigned long oldval; + __asm__ __volatile__("mov ar.ccv=%4 ;; cmpxchg8.rel %0=%1,%2,ar.ccv" + : "=r"(oldval), "=m"(*addr) + : "r"(new_val), "1"(*addr), "r"(old) : "memory"); + return (oldval == old); +} + +#endif diff --git a/libjava/sysdep/powerpc/locks.h b/libjava/sysdep/powerpc/locks.h new file mode 100644 index 00000000000..414b5dcb7f8 --- /dev/null +++ b/libjava/sysdep/powerpc/locks.h @@ -0,0 +1,78 @@ +// locks.h - Thread synchronization primitives. PowerPC 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. */ + +inline static bool +compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + int ret; + + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(addr), "r"(new_val), "r"(old) + : "cr0", "memory"); + /* This version of __compare_and_swap is to be used when acquiring + a lock, so we don't need to worry about whether other memory + operations have completed, but we do need to be sure that any loads + after this point really occur after we have acquired the lock. */ + __asm__ __volatile__ ("isync" : : : "memory"); + return ret == 0; +} + +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__ ("sync" : : : "memory"); + *(addr) = new_val; +} + +inline static bool +compare_and_swap_release(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + int ret; + + __asm__ __volatile__ ("sync" : : : "memory"); + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(addr), "r"(new_val), "r"(old) + : "cr0", "memory"); + return ret == 0; +} + +// Ensure that subsequent instructions do not execute on stale +// data that was loaded from memory before the barrier. +inline static void +read_barrier() +{ + __asm__ __volatile__ ("isync" : : : "memory"); +} + +#endif