Generic interface to atomic operations.
authordrepper <drepper>
Thu, 20 Mar 2003 06:50:22 +0000 (06:50 +0000)
committerdrepper <drepper>
Thu, 20 Mar 2003 06:50:22 +0000 (06:50 +0000)
include/atomic.h [new file with mode: 0644]

diff --git a/include/atomic.h b/include/atomic.h
new file mode 100644 (file)
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@@ -0,0 +1,141 @@
+/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library 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.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _ATOMIC_H
+#define _ATOMIC_H      1
+
+#include <stdlib.h>
+
+#include <bits/atomic.h>
+
+
+#ifndef atomic_compare_and_exchange_acq
+# define atomic_compare_and_exchange_acq(mem, newval, oldval) \
+  ({ __typeof (__arch_compare_and_exchange_32_acq (mem, newval, oldval))      \
+        __result;                                                            \
+     if (sizeof (*mem) == 1)                                                 \
+       __result = __arch_compare_and_exchange_8_acq (mem, newval, oldval);    \
+     else if (sizeof (*mem) == 2)                                            \
+       __result = __arch_compare_and_exchange_16_acq (mem, newval, oldval);   \
+     else if (sizeof (*mem) == 4)                                            \
+       __result = __arch_compare_and_exchange_32_acq (mem, newval, oldval);   \
+     else if (sizeof (*mem) == 8)                                            \
+       __result = __arch_compare_and_exchange_64_acq (mem, newval, oldval);   \
+     else                                                                    \
+       abort ();                                                             \
+     __result; })
+#endif
+
+
+#ifndef atomic_compare_and_exchange_rel
+# define atomic_compare_and_exchange_rel(mem, oldval, newval) \
+  atomic_compare_and_exchange_acq (mem, oldval, newval)
+#endif
+
+
+#ifndef atomic_exchange_and_add
+# define atomic_exchange_and_add(mem, value) \
+  ({ __typeof (*mem) __oldval;                                               \
+     __typeof (mem) __memp = (mem);                                          \
+     __typeof (*mem) __value = (value);                                              \
+                                                                             \
+     do                                                                              \
+       __oldval = (*__memp);                                                 \
+     while (atomic_compare_and_exchange_acq (__memp, __oldval + __value,      \
+                                            __oldval));                      \
+                                                                             \
+     __oldval + __value; })
+#endif
+
+
+#ifndef atomic_add
+# define atomic_add(mem, value) (void) atomic_exchange_and_add (mem, value)
+#endif
+
+
+#ifndef atomic_increment
+# define atomic_increment(mem) atomic_add (mem, 1)
+#endif
+
+
+#ifndef atomic_increment_and_test
+# define atomic_increment_and_test(mem) \
+  (atomic_exchange_and_add (mem, 1) == 0)
+#endif
+
+
+#ifndef atomic_decrement
+# define atomic_decrement(mem) atomic_add (mem, -1)
+#endif
+
+
+#ifndef atomic_decrement_and_test
+# define atomic_decrement_and_test(mem) \
+  (atomic_exchange_and_add (mem, -1) == 0)
+#endif
+
+
+#ifndef atomic_add_negative
+# define atomic_add_negative(mem, value) \
+  (atomic_exchange_and_add (mem, value) < 0)
+#endif
+
+
+#ifndef atomic_add_zero
+# define atomic_add_zero(mem, value) \
+  (atomic_exchange_and_add (mem, value) == 0)
+#endif
+
+
+#ifndef atomic_bit_set
+# define atomic_bit_set(mem, bit) \
+  (void) atomic_bit_test_set(mem, bit)
+#endif
+
+
+#ifndef atomic_bit_test_set
+# define atomic_bit_test_set(mem, bit) \
+  ({ __typeof (*mem) __oldval;                                               \
+     __typeof (mem) __memp = (mem);                                          \
+     __typeof (*mem) __mask = (1 << (bit));                                  \
+                                                                             \
+     do                                                                              \
+       __oldval = (*__memp);                                                 \
+     while (atomic_compare_and_exchange_acq (__memp,                         \
+                                            __oldval | __mask, __oldval));   \
+                                                                             \
+     __oldval & __mask; })
+#endif
+
+
+#ifndef atomic_full_barrier
+# define atomic_full_barrier() __asm ("" ::: "memory")
+#endif
+
+
+#ifndef atomic_read_barrier
+# define atomic_read_barrier() atomic_full_barrier()
+#endif
+
+
+#ifndef atomic_write_barrier
+# define atomic_write_barrier() atomic_full_barrier()
+#endif
+
+#endif /* atomic.h */