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Diffstat (limited to 'byterun/caml/signals_machdep.h')
| -rw-r--r-- | byterun/caml/signals_machdep.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/byterun/caml/signals_machdep.h b/byterun/caml/signals_machdep.h new file mode 100644 index 000000000..4987e2f6a --- /dev/null +++ b/byterun/caml/signals_machdep.h @@ -0,0 +1,60 @@ +/***********************************************************************/ +/* */ +/* OCaml */ +/* */ +/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */ +/* */ +/* Copyright 1996 Institut National de Recherche en Informatique et */ +/* en Automatique. All rights reserved. This file is distributed */ +/* under the terms of the GNU Library General Public License, with */ +/* the special exception on linking described in file ../LICENSE. */ +/* */ +/***********************************************************************/ + +/* Processor-specific operation: atomic "read and clear" */ + +#ifndef CAML_SIGNALS_MACHDEP_H +#define CAML_SIGNALS_MACHDEP_H + +#if defined(__GNUC__) && defined(__i386__) + +#define Read_and_clear(dst,src) \ + asm("xorl %0, %0; xchgl %0, %1" \ + : "=r" (dst), "=m" (src) \ + : "m" (src)) + +#elif defined(__GNUC__) && defined(__x86_64__) + +#define Read_and_clear(dst,src) \ + asm("xorq %0, %0; xchgq %0, %1" \ + : "=r" (dst), "=m" (src) \ + : "m" (src)) + +#elif defined(__GNUC__) && defined(__ppc__) + +#define Read_and_clear(dst,src) \ + asm("0: lwarx %0, 0, %1\n\t" \ + "stwcx. %2, 0, %1\n\t" \ + "bne- 0b" \ + : "=&r" (dst) \ + : "r" (&(src)), "r" (0) \ + : "cr0", "memory") + +#elif defined(__GNUC__) && defined(__ppc64__) + +#define Read_and_clear(dst,src) \ + asm("0: ldarx %0, 0, %1\n\t" \ + "stdcx. %2, 0, %1\n\t" \ + "bne- 0b" \ + : "=&r" (dst) \ + : "r" (&(src)), "r" (0) \ + : "cr0", "memory") + +#else + +/* Default, non-atomic implementation */ +#define Read_and_clear(dst,src) ((dst) = (src), (src) = 0) + +#endif + +#endif /* CAML_SIGNALS_MACHDEP_H */ |