75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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/* Processor-specific operation: atomic "read and clear" */
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#ifndef CAML_SIGNALS_MACHDEP_H
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#define CAML_SIGNALS_MACHDEP_H
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#ifdef CAML_INTERNALS
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#if defined(__GNUC__) && defined(__ATOMIC_SEQ_CST) \
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&& defined(__GCC_ATOMIC_LONG_LOCK_FREE)
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/* Use the "atomic" builtins of GCC and Clang */
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#define Read_and_clear(dst,src) \
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((dst) = __atomic_exchange_n(&(src), 0, __ATOMIC_SEQ_CST))
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#elif defined(__GNUC__) && (defined(__i386__) || (defined(__x86_64__) \
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&& defined(__ILP32__)))
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#define Read_and_clear(dst,src) \
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asm("xorl %0, %0; xchgl %0, %1" \
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: "=r" (dst), "=m" (src) \
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: "m" (src))
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#elif defined(__GNUC__) && defined(__x86_64__)
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#define Read_and_clear(dst,src) \
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asm("xorq %0, %0; xchgq %0, %1" \
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: "=r" (dst), "=m" (src) \
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: "m" (src))
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#elif defined(__GNUC__) && defined(__ppc__)
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#define Read_and_clear(dst,src) \
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asm("0: lwarx %0, 0, %1\n\t" \
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"stwcx. %2, 0, %1\n\t" \
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"bne- 0b" \
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: "=&r" (dst) \
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: "r" (&(src)), "r" (0) \
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: "cr0", "memory")
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#elif defined(__GNUC__) && defined(__ppc64__)
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#define Read_and_clear(dst,src) \
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asm("0: ldarx %0, 0, %1\n\t" \
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"stdcx. %2, 0, %1\n\t" \
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"bne- 0b" \
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: "=&r" (dst) \
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: "r" (&(src)), "r" (0) \
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: "cr0", "memory")
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#else
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/* Default, non-atomic implementation */
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#define Read_and_clear(dst,src) ((dst) = (src), (src) = 0)
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#endif
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#endif /* CAML_INTERNALS */
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#endif /* CAML_SIGNALS_MACHDEP_H */
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