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-rw-r--r--lib/asyncsafe-spin.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/lib/asyncsafe-spin.c b/lib/asyncsafe-spin.c
index ba22b9c1e5..63352184ae 100644
--- a/lib/asyncsafe-spin.c
+++ b/lib/asyncsafe-spin.c
@@ -1,18 +1,18 @@
/* Spin locks for communication between threads and signal handlers.
- Copyright (C) 2020-2021 Free Software Foundation, Inc.
+ Copyright (C) 2020-2024 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
+ GNU Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, see <https://www.gnu.org/licenses/>. */
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
@@ -21,11 +21,13 @@
/* Specification. */
#include "asyncsafe-spin.h"
-#include <stdbool.h>
#include <stdlib.h>
#if defined _AIX
# include <sys/atomic_op.h>
#endif
+#if 0x590 <= __SUNPRO_C && __STDC__
+# define asm __asm
+#endif
#if defined _WIN32 && ! defined __CYGWIN__
/* Use Windows threads. */
@@ -68,7 +70,7 @@ asyncsafe_spin_destroy (asyncsafe_spinlock_t *lock)
require to link with -latomic. */
# if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7) \
- || __clang_major > 3 || (__clang_major__ == 3 && __clang_minor__ >= 1)) \
+ || __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 1)) \
&& !defined __ibmxl__
/* Use GCC built-ins (available in GCC >= 4.7 and clang >= 3.1) that operate on
the first byte of the lock.
@@ -132,10 +134,9 @@ do_unlock (asyncsafe_spinlock_t *lock)
# endif
# elif (((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) \
- && !defined __sparc__) \
- || __clang_major__ >= 3) \
- && !defined __ibmxl__
-/* Use GCC built-ins (available in GCC >= 4.1, except on SPARC, and
+ || __clang_major__ >= 3) \
+ && HAVE_ATOMIC_COMPARE_AND_SWAP_GCC41)
+/* Use GCC built-ins (available on many platforms with GCC >= 4.1 or
clang >= 3.0).
Documentation:
<https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html> */
@@ -190,7 +191,7 @@ do_unlock (asyncsafe_spinlock_t *lock)
abort ();
}
-# elif (defined __GNUC__ || defined __clang__ || defined __SUNPRO_C) && (defined __sparc || defined __i386 || defined __x86_64__)
+# elif ((defined __GNUC__ || defined __clang__ || defined __SUNPRO_C) && (defined __sparc || defined __i386 || defined __x86_64__)) || (defined __TINYC__ && (defined __i386 || defined __x86_64__))
/* For older versions of GCC or clang, use inline assembly.
GCC, clang, and the Oracle Studio C 12 compiler understand GCC's extended
asm syntax, but the plain Oracle Studio C 11 compiler understands only
@@ -200,9 +201,14 @@ do_unlock (asyncsafe_spinlock_t *lock)
static void
memory_barrier (void)
{
-# if defined __GNUC__ || defined __clang__ || __SUNPRO_C >= 0x590
+# if defined __GNUC__ || defined __clang__ || __SUNPRO_C >= 0x590 || defined __TINYC__
# if defined __i386 || defined __x86_64__
+# if defined __TINYC__ && defined __i386
+ /* Cannot use the SSE instruction "mfence" with this compiler. */
+ asm volatile ("lock orl $0,(%esp)");
+# else
asm volatile ("mfence");
+# endif
# endif
# if defined __sparc
asm volatile ("membar 2");
@@ -223,7 +229,7 @@ static unsigned int
atomic_compare_and_swap (volatile unsigned int *vp, unsigned int cmp,
unsigned int newval)
{
-# if defined __GNUC__ || defined __clang__ || __SUNPRO_C >= 0x590
+# if defined __GNUC__ || defined __clang__ || __SUNPRO_C >= 0x590 || defined __TINYC__
unsigned int oldval;
# if defined __i386 || defined __x86_64__
asm volatile (" lock\n cmpxchgl %3,(%1)"

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