git://sourceware.org / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5afdca00 UD |
1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | Sparc v9 version. | |
| 00a2f9aa | 3 | Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
| 5afdca00 UD |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Richard Henderson <rth@tamu.edu>. | |
| 6 | ||
| 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. | |
| 11 | ||
| 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. | |
| 16 | ||
| 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. */ | |
| 21 | ||
| 22 | ||
| 23 | /* Spinlock implementation; required. */ | |
| 24 | extern inline int | |
| 25 | testandset (int *spinlock) | |
| 26 | { | |
| 27 | int ret; | |
| 28 | ||
| 29 | __asm__ __volatile__("ldstub %1,%0" | |
| 30 | : "=r"(ret), "=m"(*spinlock) : "m"(*spinlock)); | |
| 31 | ||
| 32 | return ret; | |
| 33 | } | |
| 34 | ||
| 35 | ||
| 36 | /* Get some notion of the current stack. Need not be exactly the top | |
| 37 | of the stack, just something somewhere in the current frame. */ | |
| 38 | #define CURRENT_STACK_FRAME stack_pointer | |
| 39 | register char * stack_pointer __asm__ ("%sp"); | |
| 40 | ||
| 41 | ||
| 42 | /* Registers %g6 and %g7 are reserved by the ABI for "system use". It | |
| 43 | happens that Solaris uses %g6 for the thread pointer -- we do the same. */ | |
| 44 | struct _pthread_descr_struct; | |
| 45 | register struct _pthread_descr_struct *__thread_self __asm__("%g6"); | |
| 46 | ||
| 47 | /* Return the thread descriptor for the current thread. */ | |
| 48 | #define THREAD_SELF __thread_self | |
| 49 | ||
| 50 | /* Initialize the thread-unique value. */ | |
| 51 | #define INIT_THREAD_SELF(descr) (__thread_self = (descr)) | |
| 52 | ||
| 53 | ||
| 54 | /* Compare-and-swap for semaphores. */ | |
| 55 | ||
| 56 | #define HAS_COMPARE_AND_SWAP | |
| 57 | extern inline int | |
| 58 | __compare_and_swap (long int *p, long int oldval, long int newval) | |
| 59 | { | |
| 60 | long int readval; | |
| 61 | ||
| 62 | __asm__ __volatile__ ("cas %1, %2, %0" | |
| 63 | : "=r"(readval), "=m"(*p) | |
| 64 | : "r"(oldval), "m"(*p), "0"(newval)); | |
| 65 | ||
| 66 | return readval == newval; | |
| 67 | } | |
| 00a2f9aa UD |
68 | |
| 69 | /* Access to data in the thread descriptor is easy. */ | |
| 70 | #define THREAD_GETMEM(descr, member) __thread_self->member | |
| 71 | #define THREAD_SETMEM(descr, member, value) __thread_self->member = (value) |