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1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson <rth@tamu.edu>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If
19 not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 # define PT_EI extern inline
27 /* Spinlock implementation; required. */
29 testandset (int *spinlock
)
33 __asm__
__volatile__("ldstub %1,%0"
34 : "=r"(ret
), "=m"(*spinlock
) : "m"(*spinlock
));
40 /* Memory barrier; default is to do nothing */
41 /* FIXME: is stbar OK, or should we use the more general membar instruction?
42 If so, which mode to pass to membar? */
43 #define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory")
45 #define WRITE_MEMORY_BARRIER() \
46 __asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory")
49 /* Get some notion of the current stack. Need not be exactly the top
50 of the stack, just something somewhere in the current frame. */
51 #define CURRENT_STACK_FRAME stack_pointer
52 register char *stack_pointer
__asm__ ("%sp");
55 /* Registers %g6 and %g7 are reserved by the ABI for "system use". It
56 happens that Solaris uses %g6 for the thread pointer -- we do the same. */
57 struct _pthread_descr_struct
;
58 register struct _pthread_descr_struct
*__thread_self
__asm__("%g6");
60 /* Return the thread descriptor for the current thread. */
61 #define THREAD_SELF __thread_self
63 /* Initialize the thread-unique value. */
64 #define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
67 /* Compare-and-swap for semaphores. */
69 #define HAS_COMPARE_AND_SWAP
71 __compare_and_swap (long int *p
, long int oldval
, long int newval
)
75 __asm__
__volatile__ ("casx [%4], %2, %0"
76 : "=r"(readval
), "=m"(*p
)
77 : "r"(oldval
), "m"(*p
), "r"(p
), "0"(newval
));
79 return readval
== oldval
;
82 /* Access to data in the thread descriptor is easy. */
83 #define THREAD_GETMEM(descr, member) __thread_self->member
84 #define THREAD_GETMEM_NC(descr, member) __thread_self->member
85 #define THREAD_SETMEM(descr, member, value) __thread_self->member = (value)
86 #define THREAD_SETMEM_NC(descr, member, value) __thread_self->member = (value)
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