164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc. */
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/* Compile this one with gcc. */
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/* Copyright (C) 2019-2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* AMD GCN does not support dynamic creation of threads. There may be many
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hardware threads, but they're all created simultaneously at launch time.
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This implementation is intended to provide mutexes for libgfortran, etc.
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It is not intended to provide a TLS implementation at this time,
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although that may be added later if needed.
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__gthread_active_p returns "1" to ensure that mutexes are used, and that
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programs attempting to use emutls will fail with the appropriate abort.
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It is expected that the TLS tests will fail. */
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#ifndef GCC_GTHR_GCN_H
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#define GCC_GTHR_GCN_H
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#define __GTHREADS 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef _LIBOBJC
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#error "Objective C is not supported on AMD GCN"
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#else
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static inline int
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__gthread_active_p (void)
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{
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return 1;
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}
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typedef int __gthread_key_t;
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typedef int __gthread_once_t;
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typedef int __gthread_mutex_t;
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typedef int __gthread_recursive_mutex_t;
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#define __GTHREAD_ONCE_INIT 0
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#define __GTHREAD_MUTEX_INIT 0
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#define __GTHREAD_RECURSIVE_MUTEX_INIT 0
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static inline int
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__gthread_once (__gthread_once_t *__once __attribute__((unused)),
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void (*__func) (void) __attribute__((unused)))
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{
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return 0;
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}
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static inline int
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__gthread_key_create (__gthread_key_t *__key __attribute__((unused)),
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void (*__dtor) (void *) __attribute__((unused)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline int
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__gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline void *
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__gthread_getspecific (__gthread_key_t __key __attribute__((unused)))
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{
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return NULL;
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}
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static inline int
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__gthread_setspecific (__gthread_key_t __key __attribute__((unused)),
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const void *__ptr __attribute__((unused)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline int
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__gthread_mutex_destroy (__gthread_mutex_t *__mutex __attribute__((unused)))
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{
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return 0;
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}
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static inline int
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__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex __attribute__((unused)))
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{
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return 0;
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *__mutex)
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{
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while (__sync_lock_test_and_set (__mutex, 1))
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asm volatile ("s_sleep\t1" ::: "memory");
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return 0;
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
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{
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return __sync_lock_test_and_set (__mutex, 1);
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
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{
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__sync_lock_release (__mutex);
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return 0;
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}
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static inline int
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__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex __attribute__((unused)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline int
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__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex __attribute__((unused)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline int
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__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex __attribute__((unused)))
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{
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/* Operation is not supported. */
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return -1;
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}
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#endif /* _LIBOBJC */
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! GCC_GTHR_GCN_H */
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