2 This source code file is part of thread_mpi.
3 Written by Sander Pronk, Erik Lindahl, and possibly others.
5 Copyright (c) 2009, Sander Pronk, Erik Lindahl.
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions are met:
10 1) Redistributions of source code must retain the above copyright
11 notice, this list of conditions and the following disclaimer.
12 2) Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in the
14 documentation and/or other materials provided with the distribution.
15 3) Neither the name of the copyright holders nor the
16 names of its contributors may be used to endorse or promote products
17 derived from this software without specific prior written permission.
19 THIS SOFTWARE IS PROVIDED BY US ''AS IS'' AND ANY
20 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 DISCLAIMED. IN NO EVENT SHALL WE BE LIABLE FOR ANY
23 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 If you want to redistribute modifications, please consider that
31 scientific software is very special. Version control is crucial -
32 bugs must be traceable. We will be happy to consider code for
33 inclusion in the official distribution, but derived work should not
34 be called official thread_mpi. Details are found in the README & COPYING
41 ***************************************************************************
42 this file is not used any more. gcc intrinsics take care of the atomics
43 ***************************************************************************
47 #error included gcc_ppc.h. This file is outdated
51 typedef struct tMPI_Atomic
53 volatile int value; /*!< Volatile, to avoid compiler aliasing */
57 typedef struct tMPI_Atomic_ptr
59 void* volatile* value; /*!< Volatile, to avoid compiler aliasing */
64 typedef struct tMPI_Spinlock
66 volatile unsigned int lock; /*!< Volatile, to avoid compiler aliasing */
69 #define TMPI_ATOMIC_HAVE_NATIVE_SPINLOCK
72 #define TMPI_SPINLOCK_INITIALIZER { 0 }
74 #define tMPI_Atomic_get(a) ((a)->value)
75 #define tMPI_Atomic_set(a, i) (((a)->value) = (i))
77 #define tMPI_Atomic_ptr_get(a) (void*)((a)->value)
78 #define tMPI_Atomic_ptr_set(a, i) (((a)->value) = (void*)(i))
81 #if (TMPI_GCC_VERSION >= 40100)
83 #include "gcc_intrinsics.h"
87 /* Compiler-dependent stuff: GCC memory barrier */
88 #define tMPI_Atomic_memory_barrier() __asm__ __volatile__("isync" : : : "memory")
92 #define TMPI_ATOMIC_HAVE_NATIVE_SWAP
93 static inline int tMPI_Atomic_swap(tMPI_Atomic_t *a, int b)
97 __asm__ __volatile__ ("1: lwarx %0,0,%2 \n"
100 : "=&r" (ret), "=m" (a->value)
101 : "r" (&(a->value)), "r" (b)
107 static inline void* tMPI_Atomic_ptr_swap(tMPI_Atomic_ptr_t *a, void *b)
111 #if (!defined(__PPC64__)) && (!defined(__ppc64))
112 __asm__ __volatile__ ("1: lwarx %0,0,%2 \n"
113 "\tstwcx. %3,0,%2 \n"
115 : "=&r" (ret), "=m" (a->value)
116 : "r" (&(a->value)), "r" (b)
119 __asm__ __volatile__ ("1: ldarx %0,0,%2 \n"
120 "\tstdcx. %3,0,%2 \n"
122 : "=&r" (ret), "=m" (a->value)
123 : "r" (&(a->value)), "r" (b)
132 static inline int tMPI_Atomic_cas(tMPI_Atomic_t *a, int oldval, int newval)
136 __asm__ __volatile__ ("1: lwarx %0,0,%2 \n"
139 "\tstwcx. %4,0,%2 \n"
143 : "=&r" (prev), "=m" (a->value)
144 : "r" (&a->value), "r" (oldval), "r" (newval),
148 return prev == oldval;
152 static inline int tMPI_Atomic_ptr_cas(tMPI_Atomic_ptr_t *a, void *oldval,
157 #if (!defined(__PPC64__)) && (!defined(__ppc64))
158 __asm__ __volatile__ ("1: lwarx %0,0,%2 \n"
161 "\tstwcx. %4,0,%2 \n"
165 : "=&r" (prev), "=m" (a->value)
166 : "r" (&a->value), "r" (oldval), "r" (newval),
170 __asm__ __volatile__ ("1: ldarx %0,0,%2 \n"
173 "\tstdcx. %4,0,%2 \n"
177 : "=&r" (prev), "=m" (a->value)
178 : "r" (&a->value), "r" (oldval), "r" (newval),
182 return prev == oldval;
185 #define TMPI_ATOMIC_HAVE_NATIVE_ADD_RETURN
186 static inline int tMPI_Atomic_add_return(tMPI_Atomic_t *a, int i)
190 __asm__ __volatile__("1: lwarx %0,0,%2\n"
192 "\tstwcx. %0,0,%2 \n"
196 : "r" (i), "r" (&a->value)
203 #define TMPI_ATOMIC_HAVE_NATIVE_FETCH_ADD
204 static inline int tMPI_Atomic_fetch_add(tMPI_Atomic_t *a, int i)
208 __asm__ __volatile__("\teieio\n"
211 "\tstwcx. %0,0,%2 \n"
215 : "r" (i), "r" (&a->value)
225 static inline void tMPI_Spinlock_init(tMPI_Spinlock_t *x)
232 static inline void tMPI_Spinlock_lock(tMPI_Spinlock_t *x)
236 __asm__ __volatile__("\tb 1f\n"
247 : "r" (&x->lock), "r" (1)
252 static inline int tMPI_Spinlock_trylock(tMPI_Spinlock_t *x)
255 unsigned int mask = 1;
256 volatile unsigned int *p = &x->lock;
258 __asm__ __volatile__("\teieio\n"
259 "1: lwarx %0,0,%4 \n"
261 "\tstwcx. %1,0,%4 \n"
264 : "=&r" (old), "=&r" (t), "=m" (*p)
265 : "r" (mask), "r" (p), "m" (*p)
272 static inline void tMPI_Spinlock_unlock(tMPI_Spinlock_t *x)
274 __asm__ __volatile__("\teieio\n" : : : "memory");
279 static inline int tMPI_Spinlock_islocked(const tMPI_Spinlock_t *x)
281 return ( x->lock != 0);
285 static inline void tMPI_Spinlock_wait(tMPI_Spinlock_t *x)
289 tMPI_Atomic_memory_barrier();
291 while (tMPI_Spinlock_islocked(x));