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Moved the assembler functions from gatomic.h to gatomic.c, which makes for
2004-02-29 Sebastian Wilhelmi <seppi@seppi.de> * configure.in, glib/gatomic.c, glib/gatomic.h: Moved the assembler functions from gatomic.h to gatomic.c, which makes for better maintainability. Also use gint instead of gint32 to be able to use reference counting for ABI-fixed structures with gint/guint. * glib/gthread.h: Adapted accordingly. * tests/atomic-test.c: Updated to test for G_MAXINT and G_MININT.
This commit is contained in:
Sebastian Wilhelmi
Sebastian Wilhelmi
parent
fe2efd06a0
commit
769f36db47
507
glib/gatomic.c
507
glib/gatomic.c
@ -1,7 +1,7 @@
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/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* GAtomic: atomic integer operation.
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* g_atomic_*: atomic operations.
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* Copyright (C) 2003 Sebastian Wilhelmi
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*
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* This library is free software; you can redistribute it and/or
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@ -20,67 +20,414 @@
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* Boston, MA 02111-1307, USA.
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*/
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#include <glib.h>
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#include "config.h"
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#ifdef G_THREADS_ENABLED
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# if !defined (G_ATOMIC_USE_FALLBACK_IMPLEMENTATION)
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/* We have an inline implementation, which we can now use for the
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* fallback implementation. This fallback implementation is only used by
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* modules, which are not compliled with gcc
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#include "glib.h"
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#if defined (__GNUC__)
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# if defined (G_ATOMIC_I486)
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/* Adapted from CVS version 1.10 of glibc's sysdeps/i386/i486/bits/atomic.h
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*/
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gint32
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g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
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gint32 val)
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gint
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g_atomic_int_exchange_and_add (gint *atomic,
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gint val)
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{
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return g_atomic_int_exchange_and_add (atomic, val);
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gint result;
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__asm__ __volatile__ ("lock; xaddl %0,%1"
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: "=r" (result), "=m" (*atomic)
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: "0" (val), "m" (*atomic));
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return result;
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}
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void
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g_atomic_int_add_fallback (gint32 *atomic,
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gint32 val)
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g_atomic_int_add (gint *atomic,
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gint val)
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{
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g_atomic_int_add (atomic, val);
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__asm__ __volatile__ ("lock; addl %1,%0"
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: "=m" (*atomic)
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: "ir" (val), "m" (*atomic));
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}
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gboolean
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g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
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gint32 oldval,
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gint32 newval)
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g_atomic_int_compare_and_exchange (gint *atomic,
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gint oldval,
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gint newval)
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{
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return g_atomic_int_compare_and_exchange (atomic, oldval, newval);
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gint result;
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__asm __volatile ("lock; cmpxchgl %2, %1"
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: "=a" (result), "=m" (*atomic)
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: "r" (newval), "m" (*atomic), "0" (oldval));
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return result == oldval;
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}
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/* The same code as above, as on i386 gpointer is 32 bit as well.
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* Duplicating the code here seems more natural than casting the
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* arguments and calling the former function */
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gpointer result;
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__asm __volatile ("lock; cmpxchgl %2, %1"
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: "=a" (result), "=m" (*atomic)
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: "r" (newval), "m" (*atomic), "0" (oldval));
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return result == oldval;
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}
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# elif defined (G_ATOMIC_SPARCV9)
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/* Adapted from CVS version 1.3 of glibc's sysdeps/sparc/sparc64/bits/atomic.h
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*/
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# define ATOMIC_INT_CMP_XCHG(atomic, oldval, newval) \
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({ \
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gint __result; \
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__asm __volatile ("cas [%4], %2, %0" \
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: "=r" (__result), "=m" (*(atomic)) \
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: "r" (oldval), "m" (*(atomic)), "r" (atomic), \
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"0" (newval)); \
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__result == oldval; \
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})
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# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gpointer result;
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__asm __volatile ("cas [%4], %2, %0"
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: "=r" (result), "=m" (*atomic)
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: "r" (oldval), "m" (*atomic), "r" (atomic),
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"0" (newval));
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return result == oldval;
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}
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# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gpointer result;
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gpointer *a = atomic;
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__asm __volatile ("casx [%4], %2, %0"
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: "=r" (result), "=m" (*a)
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: "r" (oldval), "m" (*a), "r" (a),
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"0" (newval));
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return result != 0;
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}
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# else /* What's that */
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# error "Your system has an unsupported pointer size"
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# endif /* GLIB_SIZEOF_VOID_P */
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# define G_ATOMIC_MEMORY_BARRIER \
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__asm __volatile ("membar #LoadLoad | #LoadStore" \
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" | #StoreLoad | #StoreStore" : : : "memory")
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# elif defined (G_ATOMIC_ALPHA)
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/* Adapted from CVS version 1.3 of glibc's sysdeps/alpha/bits/atomic.h
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*/
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# define ATOMIC_INT_CMP_XCHG(atomic, oldval, newval) \
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({ \
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gint __result; \
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gint __prev; \
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__asm__ __volatile__ ( \
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" mb\n" \
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"1: ldl_l %0,%2\n" \
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" cmpeq %0,%3,%1\n" \
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" beq %1,2f\n" \
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" mov %4,%1\n" \
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" stl_c %1,%2\n" \
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" beq %1,1b\n" \
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" mb\n" \
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"2:" \
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: "=&r" (__prev), \
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"=&r" (__result) \
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: "m" (*(atomic)), \
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"Ir" (oldval), \
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"Ir" (newval) \
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: "memory"); \
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__result != 0; \
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})
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# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gint result;
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gpointer prev;
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__asm__ __volatile__ (
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" mb\n"
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"1: ldl_l %0,%2\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stl_c %1,%2\n"
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" beq %1,1b\n"
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" mb\n"
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"2:"
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: "=&r" (prev),
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"=&r" (result)
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: "m" (*atomic),
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"Ir" (oldval),
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"Ir" (newval)
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: "memory");
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return result != 0;
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}
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# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gint result;
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gpointer prev;
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__asm__ __volatile__ (
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" mb\n"
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"1: ldq_l %0,%2\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stq_c %1,%2\n"
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" beq %1,1b\n"
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" mb\n"
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"2:"
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: "=&r" (prev),
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"=&r" (result)
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: "m" (*atomic),
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"Ir" (oldval),
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"Ir" (newval)
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: "memory");
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return result != 0;
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}
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# else /* What's that */
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# error "Your system has an unsupported pointer size"
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# endif /* GLIB_SIZEOF_VOID_P */
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# define G_ATOMIC_MEMORY_BARRIER __asm ("mb" : : : "memory")
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# elif defined (G_ATOMIC_X86_64)
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/* Adapted from CVS version 1.9 of glibc's sysdeps/x86_64/bits/atomic.h
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*/
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gint
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g_atomic_int_exchange_and_add (gint *atomic,
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gint val)
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{
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gint result;
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__asm__ __volatile__ ("lock; xaddl %0,%1"
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: "=r" (result), "=m" (*atomic)
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: "0" (val), "m" (*atomic));
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return result;
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}
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void
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g_atomic_int_add (gint *atomic,
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gint val)
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{
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__asm__ __volatile__ ("lock; addl %1,%0"
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: "=m" (*atomic)
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: "ir" (val), "m" (*atomic));
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}
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gboolean
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g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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g_atomic_int_compare_and_exchange (gint *atomic,
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gint oldval,
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gint newval)
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{
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return g_atomic_pointer_compare_and_exchange (atomic, oldval, newval);
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gint result;
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__asm __volatile ("lock; cmpxchgl %2, %1"
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: "=a" (result), "=m" (*atomic)
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: "r" (newval), "m" (*atomic), "0" (oldval));
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return result == oldval;
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}
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gint32
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g_atomic_int_get_fallback (gint32 *atomic)
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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return g_atomic_int_get (atomic);
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gpointer result;
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__asm __volatile ("lock; cmpxchgq %q2, %1"
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: "=a" (result), "=m" (*atomic)
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: "r" (newval), "m" (*atomic), "0" (oldval));
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return result == oldval;
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}
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gint32
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g_atomic_pointer_get_fallback (gpointer *atomic)
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# elif defined (G_ATOMIC_POWERPC)
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/* Adapted from CVS version 1.12 of glibc's sysdeps/powerpc/bits/atomic.h
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* and CVS version 1.3 of glibc's sysdeps/powerpc/powerpc32/bits/atomic.h
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* and CVS version 1.2 of glibc's sysdeps/powerpc/powerpc64/bits/atomic.h
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*/
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gint
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g_atomic_int_exchange_and_add (gint *atomic,
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gint val)
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{
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return g_atomic_int_get (atomic);
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}
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gint result, temp;
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__asm __volatile ("1: lwarx %0,0,%3\n"
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" add %1,%0,%4\n"
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" stwcx. %1,0,%3\n"
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" bne- 1b"
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: "=&b" (result), "=&r" (temp), "=m" (*atomic)
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: "b" (atomic), "r" (val), "2" (*atomic)
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: "cr0", "memory");
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return result;
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}
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/* The same as above, to save a function call repeated here */
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void
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g_atomic_int_add (gint *atomic,
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gint val)
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{
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gint result, temp;
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__asm __volatile ("1: lwarx %0,0,%3\n"
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" add %1,%0,%4\n"
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" stwcx. %1,0,%3\n"
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" bne- 1b"
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: "=&b" (result), "=&r" (temp), "=m" (*atomic)
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: "b" (atomic), "r" (val), "2" (*atomic)
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: "cr0", "memory");
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}
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# else /* !G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
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# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
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gboolean
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g_atomic_int_compare_and_exchange (gint *atomic,
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gint oldval,
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gint newval)
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{
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gint result;
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__asm __volatile ("sync\n"
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"1: lwarx %0,0,%1\n"
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" subf. %0,%2,%0\n"
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" bne 2f\n"
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" stwcx. %3,0,%1\n"
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" bne- 1b\n"
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"2: isync"
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: "=&r" (result)
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: "b" (atomic), "r" (oldval), "r" (newval)
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: "cr0", "memory");
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return result == 0;
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}
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
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{
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gpointer result;
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__asm __volatile ("sync\n"
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"1: lwarx %0,0,%1\n"
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" subf. %0,%2,%0\n"
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" bne 2f\n"
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" stwcx. %3,0,%1\n"
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" bne- 1b\n"
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"2: isync"
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: "=&r" (result)
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: "b" (atomic), "r" (oldval), "r" (newval)
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: "cr0", "memory");
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return result == 0;
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}
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# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
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gboolean
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g_atomic_int_compare_and_exchange (gint *atomic,
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gint oldval,
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gint newval)
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{
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__asm __volatile ("sync\n"
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"1: lwarx %0,0,%1\n"
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" extsw %0,%0\n"
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" subf. %0,%2,%0\n"
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" bne 2f\n"
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" stwcx. %3,0,%1\n"
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" bne- 1b\n"
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"2: isync"
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: "=&r" (result)
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: "b" (atomic), "r" (oldval), "r" (newval)
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: "cr0", "memory");
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return result == 0;
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}
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gboolean
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
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gpointer oldval,
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gpointer newval)
|
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{
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gpointer result;
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__asm __volatile ("sync\n"
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"1: ldarx %0,0,%1\n"
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" subf. %0,%2,%0\n"
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" bne 2f\n"
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" stdcx. %3,0,%1\n"
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" bne- 1b\n"
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"2: isync"
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: "=&r" (result)
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: "b" (atomic), "r" (oldval), "r" (newval)
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: "cr0", "memory");
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return result == 0;
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}
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# else /* What's that */
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# error "Your system has an unsupported pointer size"
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# endif /* GLIB_SIZEOF_VOID_P */
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# define G_ATOMIC_MEMORY_BARRIER __asm ("sync" : : : "memory")
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# elif defined (G_ATOMIC_IA64)
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/* Adapted from CVS version 1.8 of glibc's sysdeps/ia64/bits/atomic.h
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*/
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gint
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g_atomic_int_exchange_and_add (gint *atomic,
|
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gint val)
|
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{
|
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return __sync_fetch_and_add_si (atomic, val);
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}
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void
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g_atomic_int_add (gint *atomic,
|
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gint val)
|
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{
|
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__sync_fetch_and_add_si (atomic, val);
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}
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|
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gboolean
|
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g_atomic_int_compare_and_exchange (gint *atomic,
|
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gint oldval,
|
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gint newval)
|
||||
{
|
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return __sync_bool_compare_and_swap_si (atomic, oldval, newval);
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}
|
||||
|
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gboolean
|
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g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
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gpointer oldval,
|
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gpointer newval)
|
||||
{
|
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return __sync_bool_compare_and_swap_di ((long *)atomic,
|
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(long)oldval, (long)newval);
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}
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# define G_ATOMIC_MEMORY_BARRIER __sync_synchronize ()
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# else /* !G_ATOMIC */
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# define DEFINE_WITH_MUTEXES
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# endif /* G_ATOMIC */
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#else /* !__GNUC__ */
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# define DEFINE_WITH_MUTEXES
|
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#endif /* __GNUC__ */
|
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|
||||
#ifdef DEFINE_WITH_MUTEXES
|
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/* We have to use the slow, but safe locking method */
|
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G_LOCK_DEFINE_STATIC (g_atomic_lock);
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|
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gint32
|
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g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
|
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gint32 val)
|
||||
gint
|
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g_atomic_int_exchange_and_add (gint *atomic,
|
||||
gint val)
|
||||
{
|
||||
gint32 result;
|
||||
gint result;
|
||||
|
||||
G_LOCK (g_atomic_lock);
|
||||
result = *atomic;
|
||||
@ -92,8 +439,8 @@ g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
|
||||
|
||||
|
||||
void
|
||||
g_atomic_int_add_fallback (gint32 *atomic,
|
||||
gint32 val)
|
||||
g_atomic_int_add (gint *atomic,
|
||||
gint val)
|
||||
{
|
||||
G_LOCK (g_atomic_lock);
|
||||
*atomic += val;
|
||||
@ -101,9 +448,9 @@ g_atomic_int_add_fallback (gint32 *atomic,
|
||||
}
|
||||
|
||||
gboolean
|
||||
g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
g_atomic_int_compare_and_exchange (gint *atomic,
|
||||
gint oldval,
|
||||
gint newval)
|
||||
{
|
||||
gboolean result;
|
||||
|
||||
@ -121,9 +468,9 @@ g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
|
||||
}
|
||||
|
||||
gboolean
|
||||
g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gboolean result;
|
||||
|
||||
@ -140,10 +487,10 @@ g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline gint32
|
||||
g_atomic_int_get_fallback (gint32 *atomic)
|
||||
gint
|
||||
g_atomic_int_get (gint *atomic)
|
||||
{
|
||||
gint32 result;
|
||||
gint result;
|
||||
|
||||
G_LOCK (g_atomic_lock);
|
||||
result = *atomic;
|
||||
@ -152,8 +499,8 @@ g_atomic_int_get_fallback (gint32 *atomic)
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline gpointer
|
||||
g_atomic_pointer_get_fallback (gpointer *atomic)
|
||||
gpointer
|
||||
g_atomic_pointer_get (gpointer *atomic)
|
||||
{
|
||||
gpointer result;
|
||||
|
||||
@ -163,16 +510,56 @@ g_atomic_pointer_get_fallback (gpointer *atomic)
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
# endif /* G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
|
||||
#else /* !G_THREADS_ENABLED */
|
||||
gint32 g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
#elif defined (G_ATOMIC_OP_MEMORY_BARRIER_NEEDED)
|
||||
gint
|
||||
g_atomic_int_get (gint *atomic)
|
||||
{
|
||||
gint32 result = *atomic;
|
||||
*atomic += val;
|
||||
gint result = *atomic;
|
||||
|
||||
G_ATOMIC_MEMORY_BARRIER;
|
||||
|
||||
return result;
|
||||
}
|
||||
#endif /* G_THREADS_ENABLED */
|
||||
|
||||
gpointer
|
||||
g_atomic_pointer_get (gpointer *atomic)
|
||||
{
|
||||
gpointer result = *atomic;
|
||||
|
||||
G_ATOMIC_MEMORY_BARRIER;
|
||||
|
||||
return result;
|
||||
}
|
||||
#endif /* DEFINE_WITH_MUTEXES || G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
|
||||
|
||||
#ifdef ATOMIC_INT_CMP_XCHG
|
||||
gboolean
|
||||
g_atomic_int_compare_and_exchange (gint *atomic,
|
||||
gint oldval,
|
||||
gint newval)
|
||||
{
|
||||
return ATOMIC_INT_CMP_XCHG (atomic, oldval, newval);
|
||||
}
|
||||
|
||||
gint
|
||||
g_atomic_int_exchange_and_add (gint *atomic,
|
||||
gint val)
|
||||
{
|
||||
gint result;
|
||||
do
|
||||
result = *atomic;
|
||||
while (!ATOMIC_INT_CMP_XCHG (atomic, result, result + val));
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
void
|
||||
g_atomic_int_add (gint *atomic,
|
||||
gint val)
|
||||
{
|
||||
gint result;
|
||||
do
|
||||
result = *atomic;
|
||||
while (!ATOMIC_INT_CMP_XCHG (atomic, result, result + val));
|
||||
}
|
||||
#endif /* ATOMIC_INT_CMP_XCHG */
|
||||
|
||||
515
glib/gatomic.h
515
glib/gatomic.h
@ -1,7 +1,7 @@
|
||||
/* GLIB - Library of useful routines for C programming
|
||||
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
|
||||
*
|
||||
* GAtomic: atomic integer operation.
|
||||
* g_atomic_*: atomic operations.
|
||||
* Copyright (C) 2003 Sebastian Wilhelmi
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
@ -34,507 +34,24 @@
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
#ifdef G_THREADS_ENABLED
|
||||
gint g_atomic_int_exchange_and_add (gint *atomic,
|
||||
gint val);
|
||||
void g_atomic_int_add (gint *atomic,
|
||||
gint val);
|
||||
gboolean g_atomic_int_compare_and_exchange (gint *atomic,
|
||||
gint oldval,
|
||||
gint newval);
|
||||
gboolean g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval);
|
||||
|
||||
gint32 g_atomic_int_exchange_and_add_fallback (gint32 *atomic,
|
||||
gint32 val);
|
||||
void g_atomic_int_add_fallback (gint32 *atomic,
|
||||
gint32 val);
|
||||
gboolean g_atomic_int_compare_and_exchange_fallback (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval);
|
||||
gboolean g_atomic_pointer_compare_and_exchange_fallback (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval);
|
||||
|
||||
# if defined (__GNUC__)
|
||||
# if defined (G_ATOMIC_INLINED_IMPLEMENTATION_I486)
|
||||
/* Adapted from CVS version 1.10 of glibc's sysdeps/i386/i486/bits/atomic.h
|
||||
*/
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
gint32 result;
|
||||
|
||||
__asm__ __volatile__ ("lock; xaddl %0,%1"
|
||||
: "=r" (result), "=m" (*atomic)
|
||||
: "0" (val), "m" (*atomic));
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
__asm__ __volatile__ ("lock; addl %1,%0"
|
||||
: "=m" (*atomic)
|
||||
: "ir" (val), "m" (*atomic));
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
gint32 result;
|
||||
|
||||
__asm __volatile ("lock; cmpxchgl %2, %1"
|
||||
: "=a" (result), "=m" (*atomic)
|
||||
: "r" (newval), "m" (*atomic), "0" (oldval));
|
||||
|
||||
return result == oldval;
|
||||
}
|
||||
|
||||
/* The same code as above, as on i386 gpointer is 32 bit as well.
|
||||
* Duplicating the code here seems more natural than casting the
|
||||
* arguments and calling the former function */
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
|
||||
__asm __volatile ("lock; cmpxchgl %2, %1"
|
||||
: "=a" (result), "=m" (*atomic)
|
||||
: "r" (newval), "m" (*atomic), "0" (oldval));
|
||||
|
||||
return result == oldval;
|
||||
}
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() /* Not needed */
|
||||
|
||||
# elif defined(G_ATOMIC_INLINED_IMPLEMENTATION_SPARCV9) \
|
||||
&& (defined(__sparcv8) || defined(__sparcv9) || defined(__sparc_v9__))
|
||||
/* Adapted from CVS version 1.3 of glibc's sysdeps/sparc/sparc64/bits/atomic.h
|
||||
*/
|
||||
/* Why the test for __sparcv8, wheras really the sparcv9 architecture
|
||||
* is required for the folowing assembler instructions? On
|
||||
* sparc-solaris the only difference detectable at compile time
|
||||
* between no -m and -mcpu=v9 is __sparcv8.
|
||||
*
|
||||
* However, in case -mcpu=v8 is set, the assembler will fail. This
|
||||
* should be rare however, as there are only very few v8-not-v9
|
||||
* machines still out there (and we can't do better).
|
||||
*/
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
gint32 result;
|
||||
__asm __volatile ("cas [%4], %2, %0"
|
||||
: "=r" (result), "=m" (*atomic)
|
||||
: "r" (oldval), "m" (*atomic), "r" (atomic),
|
||||
"0" (newval));
|
||||
return result != 0;
|
||||
}
|
||||
|
||||
# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
__asm __volatile ("cas [%4], %2, %0"
|
||||
: "=r" (result), "=m" (*atomic)
|
||||
: "r" (oldval), "m" (*atomic), "r" (atomic),
|
||||
"0" (newval));
|
||||
return result != 0;
|
||||
}
|
||||
# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
gpointer *a = atomic;
|
||||
__asm __volatile ("casx [%4], %2, %0"
|
||||
: "=r" (result), "=m" (*a)
|
||||
: "r" (oldval), "m" (*a), "r" (a),
|
||||
"0" (newval));
|
||||
return result != 0;
|
||||
}
|
||||
# else /* What's that */
|
||||
# error "Your system has an unsupported pointer size"
|
||||
# endif /* GLIB_SIZEOF_VOID_P */
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
gint32 result;
|
||||
do
|
||||
result = *atomic;
|
||||
while (!g_atomic_int_compare_and_exchange (atomic, result, result + val));
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
g_atomic_int_exchange_and_add (atomic, val);
|
||||
}
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() \
|
||||
__asm __volatile ("membar #LoadLoad | #LoadStore" \
|
||||
" | #StoreLoad | #StoreStore" : : : "memory")
|
||||
|
||||
# elif defined(G_ATOMIC_INLINED_IMPLEMENTATION_ALPHA)
|
||||
/* Adapted from CVS version 1.3 of glibc's sysdeps/alpha/bits/atomic.h
|
||||
*/
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
gint32 result;
|
||||
gint32 prev;
|
||||
__asm__ __volatile__ (
|
||||
" mb\n"
|
||||
"1: ldl_l %0,%2\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,1b\n"
|
||||
" mb\n"
|
||||
"2:"
|
||||
: "=&r" (prev),
|
||||
"=&r" (result)
|
||||
: "m" (*atomic),
|
||||
"Ir" ((gint64)oldval),
|
||||
"Ir" (newval)
|
||||
: "memory");
|
||||
return result != 0;
|
||||
}
|
||||
# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gint32 result;
|
||||
gpointer prev;
|
||||
__asm__ __volatile__ (
|
||||
" mb\n"
|
||||
"1: ldl_l %0,%2\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,1b\n"
|
||||
" mb\n"
|
||||
"2:"
|
||||
: "=&r" (prev),
|
||||
"=&r" (result)
|
||||
: "m" (*atomic),
|
||||
"Ir" ((gint64)oldval),
|
||||
"Ir" (newval)
|
||||
: "memory");
|
||||
return result != 0;
|
||||
}
|
||||
# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gint32 result;
|
||||
gpointer prev;
|
||||
__asm__ __volatile__ (
|
||||
" mb\n"
|
||||
"1: ldq_l %0,%2\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,1b\n"
|
||||
" mb\n"
|
||||
"2:"
|
||||
: "=&r" (prev),
|
||||
"=&r" (result)
|
||||
: "m" (*atomic),
|
||||
"Ir" ((gint64)oldval),
|
||||
"Ir" (newval)
|
||||
: "memory");
|
||||
return result != 0;
|
||||
}
|
||||
# else /* What's that */
|
||||
# error "Your system has an unsupported pointer size"
|
||||
# endif /* GLIB_SIZEOF_VOID_P */
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
gint32 result;
|
||||
do
|
||||
result = *atomic;
|
||||
while (!g_atomic_int_compare_and_exchange (atomic, result, result + val));
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
g_atomic_int_exchange_and_add (atomic, val);
|
||||
}
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() __asm ("mb" : : : "memory")
|
||||
|
||||
# elif defined(G_ATOMIC_INLINED_IMPLEMENTATION_X86_64)
|
||||
/* Adapted from CVS version 1.9 of glibc's sysdeps/x86_64/bits/atomic.h
|
||||
*/
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
gint32 result;
|
||||
|
||||
__asm__ __volatile__ ("lock; xaddl %0,%1"
|
||||
: "=r" (result), "=m" (*atomic)
|
||||
: "0" (val), "m" (*atomic));
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
__asm__ __volatile__ ("lock; addl %1,%0"
|
||||
: "=m" (*atomic)
|
||||
: "ir" (val), "m" (*atomic));
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
gint32 result;
|
||||
|
||||
__asm __volatile ("lock; cmpxchgl %2, %1"
|
||||
: "=a" (result), "=m" (*atomic)
|
||||
: "r" (newval), "m" (*atomic), "0" (oldval));
|
||||
|
||||
return result == oldval;
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
|
||||
__asm __volatile ("lock; cmpxchgq %q2, %1"
|
||||
: "=a" (result), "=m" (*atomic)
|
||||
: "r" (newval), "m" (*atomic), "0" (oldval));
|
||||
|
||||
return result == oldval;
|
||||
}
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() /* Not needed */
|
||||
|
||||
# elif defined(G_ATOMIC_INLINED_IMPLEMENTATION_POWERPC)
|
||||
/* Adapted from CVS version 1.12 of glibc's sysdeps/powerpc/bits/atomic.h
|
||||
* and CVS version 1.3 of glibc's sysdeps/powerpc/powerpc32/bits/atomic.h
|
||||
* and CVS version 1.2 of glibc's sysdeps/powerpc/powerpc64/bits/atomic.h
|
||||
*/
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
gint32 result, temp;
|
||||
__asm __volatile ("1: lwarx %0,0,%3\n"
|
||||
" add %1,%0,%4\n"
|
||||
" stwcx. %1,0,%3\n"
|
||||
" bne- 1b"
|
||||
: "=&b" (result), "=&r" (temp), "=m" (*atomic)
|
||||
: "b" (atomic), "r" (val), "2" (*atomic)
|
||||
: "cr0", "memory");
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
g_atomic_int_exchange_and_add (atomic, val);
|
||||
}
|
||||
|
||||
# if GLIB_SIZEOF_VOID_P == 4 /* 32-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
gint32 result;
|
||||
__asm __volatile ("sync\n"
|
||||
"1: lwarx %0,0,%1\n"
|
||||
" subf. %0,%2,%0\n"
|
||||
" bne 2f\n"
|
||||
" stwcx. %3,0,%1\n"
|
||||
" bne- 1b\n"
|
||||
"2: isync"
|
||||
: "=&r" (result)
|
||||
: "b" (atomic), "r" (oldval), "r" (newval)
|
||||
: "cr0", "memory");
|
||||
return result == 0;
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
__asm __volatile ("sync\n"
|
||||
"1: lwarx %0,0,%1\n"
|
||||
" subf. %0,%2,%0\n"
|
||||
" bne 2f\n"
|
||||
" stwcx. %3,0,%1\n"
|
||||
" bne- 1b\n"
|
||||
"2: isync"
|
||||
: "=&r" (result)
|
||||
: "b" (atomic), "r" (oldval), "r" (newval)
|
||||
: "cr0", "memory");
|
||||
return result == 0;
|
||||
}
|
||||
# elif GLIB_SIZEOF_VOID_P == 8 /* 64-bit system */
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
__asm __volatile ("sync\n"
|
||||
"1: lwarx %0,0,%1\n"
|
||||
" extsw %0,%0\n"
|
||||
" subf. %0,%2,%0\n"
|
||||
" bne 2f\n"
|
||||
" stwcx. %3,0,%1\n"
|
||||
" bne- 1b\n"
|
||||
"2: isync"
|
||||
: "=&r" (result)
|
||||
: "b" (atomic), "r" (oldval), "r" (newval)
|
||||
: "cr0", "memory");
|
||||
return result == 0;
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
gpointer result;
|
||||
__asm __volatile ("sync\n"
|
||||
"1: ldarx %0,0,%1\n"
|
||||
" subf. %0,%2,%0\n"
|
||||
" bne 2f\n"
|
||||
" stdcx. %3,0,%1\n"
|
||||
" bne- 1b\n"
|
||||
"2: isync"
|
||||
: "=&r" (result)
|
||||
: "b" (atomic), "r" (oldval), "r" (newval)
|
||||
: "cr0", "memory");
|
||||
return result == 0;
|
||||
}
|
||||
# else /* What's that */
|
||||
# error "Your system has an unsupported pointer size"
|
||||
# endif /* GLIB_SIZEOF_VOID_P */
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() __asm ("sync" : : : "memory")
|
||||
|
||||
# elif defined(G_ATOMIC_INLINED_IMPLEMENTATION_IA64)
|
||||
/* Adapted from CVS version 1.8 of glibc's sysdeps/ia64/bits/atomic.h
|
||||
*/
|
||||
static inline gint32
|
||||
g_atomic_int_exchange_and_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
return __sync_fetch_and_add_si (atomic, val);
|
||||
}
|
||||
|
||||
static inline void
|
||||
g_atomic_int_add (gint32 *atomic,
|
||||
gint32 val)
|
||||
{
|
||||
__sync_fetch_and_add_si (atomic, val);
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_int_compare_and_exchange (gint32 *atomic,
|
||||
gint32 oldval,
|
||||
gint32 newval)
|
||||
{
|
||||
return __sync_bool_compare_and_exchange_si (atomic, oldval, newval);
|
||||
}
|
||||
|
||||
static inline gboolean
|
||||
g_atomic_pointer_compare_and_exchange (gpointer *atomic,
|
||||
gpointer oldval,
|
||||
gpointer newval)
|
||||
{
|
||||
return __sync_bool_compare_and_exchange_di ((long *)atomic,
|
||||
(long)oldval, (long)newval);
|
||||
}
|
||||
|
||||
# define G_ATOMIC_MEMORY_BARRIER() __sync_synchronize ()
|
||||
|
||||
# else /* !G_ATOMIC_INLINED_IMPLEMENTATION_... */
|
||||
# define G_ATOMIC_USE_FALLBACK_IMPLEMENTATION
|
||||
# endif /* G_ATOMIC_INLINED_IMPLEMENTATION_... */
|
||||
# else /* !__GNU__ */
|
||||
# define G_ATOMIC_USE_FALLBACK_IMPLEMENTATION
|
||||
# endif /* __GNUC__ */
|
||||
# ifdef G_ATOMIC_USE_FALLBACK_IMPLEMENTATION
|
||||
# define g_atomic_int_exchange_and_add \
|
||||
g_atomic_int_exchange_and_add_fallback
|
||||
# define g_atomic_int_add \
|
||||
g_atomic_int_add_fallback
|
||||
# define g_atomic_int_compare_and_exchange \
|
||||
g_atomic_int_compare_and_exchange_fallback
|
||||
# define g_atomic_pointer_compare_and_exchange \
|
||||
g_atomic_pointer_compare_and_exchange_fallback
|
||||
# define g_atomic_int_get \
|
||||
g_atomic_int_get_fallback
|
||||
# define g_atomic_pointer_get \
|
||||
g_atomic_pointer_get_fallback
|
||||
# else /* !G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
|
||||
static inline gint32
|
||||
g_atomic_int_get (gint32 *atomic)
|
||||
{
|
||||
gint32 result = *atomic;
|
||||
G_ATOMIC_MEMORY_BARRIER ();
|
||||
return result;
|
||||
}
|
||||
|
||||
static inline gpointer
|
||||
g_atomic_pointer_get (gpointer *atomic)
|
||||
{
|
||||
gpointer result = *atomic;
|
||||
G_ATOMIC_MEMORY_BARRIER ();
|
||||
return result;
|
||||
}
|
||||
# endif /* G_ATOMIC_USE_FALLBACK_IMPLEMENTATION */
|
||||
#else /* !G_THREADS_ENABLED */
|
||||
gint32 g_atomic_int_exchange_and_add (gint32 *atomic, gint32 val);
|
||||
# define g_atomic_int_add(atomic, val) (void)(*(atomic) += (val))
|
||||
# define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
|
||||
(*(atomic) == (oldval) ? (*(atomic) = (newval), TRUE) : FALSE)
|
||||
# define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
|
||||
(*(atomic) == (oldval) ? (*(atomic) = (newval), TRUE) : FALSE)
|
||||
#ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
|
||||
gint g_atomic_int_get (gint *atomic);
|
||||
gpointer g_atomic_pointer_get (gpointer *atomic);
|
||||
#else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
|
||||
# define g_atomic_int_get(atomic) (*(atomic))
|
||||
# define g_atomic_pointer_get(atomic) (*(atomic))
|
||||
# define G_ATOMIC_MEMORY_BARRIER() /* Not needed */
|
||||
#endif /* G_THREADS_ENABLED */
|
||||
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
|
||||
|
||||
#define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1))
|
||||
#define g_atomic_int_dec_and_test(atomic) \
|
||||
|
||||
@ -29,8 +29,7 @@
|
||||
|
||||
#include <glib/gerror.h>
|
||||
#include <glib/gtypes.h>
|
||||
#include <glib/gutils.h> /* for G_CAN_INLINE */
|
||||
#include <glib/gatomic.h> /* for G_ATOMIC_MEMORY_BARRIER */
|
||||
#include <glib/gatomic.h> /* for g_atomic_pointer_get */
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
@ -138,6 +137,10 @@ void g_thread_init_with_errorcheck_mutexes (GThreadFunctions* vtable);
|
||||
/* internal function for fallback static mutex implementation */
|
||||
GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
|
||||
|
||||
#define g_static_mutex_get_mutex_impl_shortcut(mutex) \
|
||||
(g_atomic_pointer_get ((gpointer*)mutex) ? *(mutex) : \
|
||||
g_static_mutex_get_mutex_impl (mutex))
|
||||
|
||||
/* shorthands for conditional and unconditional function calls */
|
||||
|
||||
#define G_THREAD_UF(op, arglist) \
|
||||
@ -304,30 +307,15 @@ struct _GOnce
|
||||
|
||||
gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
|
||||
|
||||
#if defined (G_CAN_INLINE) && defined (G_ATOMIC_MEMORY_BARRIER)
|
||||
static inline gpointer
|
||||
g_once (GOnce *once, GThreadFunc func, gpointer arg)
|
||||
{
|
||||
if (once->status != G_ONCE_STATUS_READY)
|
||||
return g_once_impl (once, func, arg);
|
||||
|
||||
G_ATOMIC_MEMORY_BARRIER ();
|
||||
return once->retval;
|
||||
}
|
||||
static inline GMutex*
|
||||
g_static_mutex_get_mutex_impl_shortcut (GMutex **mutex)
|
||||
{
|
||||
if (! *mutex)
|
||||
return g_static_mutex_get_mutex_impl (mutex);
|
||||
|
||||
G_ATOMIC_MEMORY_BARRIER ();
|
||||
return *mutex;
|
||||
}
|
||||
#else /* !G_CAN_INLINE || !G_ATOMIC_MEMORY_BARRIER */
|
||||
# define g_once g_once_impl
|
||||
# define g_static_mutex_get_mutex_impl_shortcut g_static_mutex_get_mutex_impl
|
||||
#endif /* G_CAN_INLINE && G_ATOMIC_MEMORY_BARRIER*/
|
||||
|
||||
#ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
|
||||
# define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
|
||||
#else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
|
||||
# define g_once(once, func, arg) \
|
||||
(((once)->status == G_ONCE_STATUS_READY) ? \
|
||||
(once)->retval : \
|
||||
g_once_impl ((once), (func), (arg)))
|
||||
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
|
||||
|
||||
/* these are some convenience macros that expand to nothing if GLib
|
||||
* was configured with --disable-threads. for using StaticMutexes,
|
||||
* you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)
|
||||
|
||||
@ -11,7 +11,7 @@ main (int argc,
|
||||
char *argv[])
|
||||
{
|
||||
gint i;
|
||||
gint32 atomic = -5;
|
||||
gint atomic = -5;
|
||||
gpointer atomic_pointer = NULL;
|
||||
gpointer biggest_pointer = atomic_pointer - 1;
|
||||
|
||||
@ -43,6 +43,12 @@ main (int argc,
|
||||
g_assert (!g_atomic_int_compare_and_exchange (&atomic, 42, 12));
|
||||
g_assert (atomic == 20);
|
||||
|
||||
g_assert (g_atomic_int_compare_and_exchange (&atomic, 20, G_MAXINT));
|
||||
g_assert (atomic == G_MAXINT);
|
||||
|
||||
g_assert (g_atomic_int_compare_and_exchange (&atomic, G_MAXINT, G_MININT));
|
||||
g_assert (atomic == G_MININT);
|
||||
|
||||
g_assert (g_atomic_pointer_compare_and_exchange (&atomic_pointer,
|
||||
NULL, biggest_pointer));
|
||||
g_assert (atomic_pointer == biggest_pointer);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user