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/* |
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Modifications for Freebob (C) 2006 Pieter Palmers |
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Copied from the jackd/jackdmp sources |
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function names changed in order to avoid naming problems when using this in |
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a jackd backend. |
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Copyright (C) 2004-2006 Grame |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#ifndef __FreebobAtomic__ |
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#define __FreebobAtomic__ |
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typedef unsigned short UInt16; |
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typedef unsigned long UInt32; |
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typedef long SInt32; |
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typedef unsigned long long UInt64; |
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#if defined(__APPLE__) |
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#if defined(__ppc__) |
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static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr) |
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{ |
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register int result; |
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asm volatile ( |
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"# CAS \n" |
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" lwarx r0, 0, %1 \n" // creates a reservation on addr |
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" cmpw r0, %2 \n" // test value at addr |
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" bne- 1f \n" |
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" sync \n" // synchronize instructions |
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" stwcx. %3, 0, %1 \n" // if the reservation is not altered |
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// stores the new value at addr |
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" bne- 1f \n" |
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" li %0, 1 \n" |
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" b 2f \n" |
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"1: \n" |
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" li %0, 0 \n" |
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"2: \n" |
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: "=r" (result) |
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: "r" (addr), "r" (value), "r" (newvalue) |
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: "r0" |
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); |
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return result; |
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} |
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#endif |
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#if defined(__i386__) || defined(__x86_64__) |
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#ifdef __SMP__ |
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# define LOCK "lock ; " |
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#else |
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# define LOCK "" |
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#endif |
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static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr) |
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{ |
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register char ret; |
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__asm__ __volatile__ ( |
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"# CAS \n\t" |
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LOCK "cmpxchg %2, (%1) \n\t" |
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"sete %0 \n\t" |
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: "=a" (ret) |
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: "c" (addr), "d" (newvalue), "a" (value) |
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); |
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return ret; |
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} |
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#endif |
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#endif |
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#ifdef __linux__ |
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#ifdef __PPC__ |
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static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr) |
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{ |
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register int result; |
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register UInt32 tmp; |
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asm volatile ( |
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"# CAS \n" |
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" lwarx %4, 0, %1 \n" // creates a reservation on addr |
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" cmpw %4, %2 \n" // test value at addr |
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" bne- 1f \n" |
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" sync \n" // synchronize instructions |
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" stwcx. %3, 0, %1 \n" // if the reservation is not altered |
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// stores the new value at addr |
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" bne- 1f \n" |
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" li %0, 1 \n" |
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" b 2f \n" |
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"1: \n" |
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" li %0, 0 \n" |
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"2: \n" |
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: "=r" (result) |
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: "r" (addr), "r" (value), "r" (newvalue), "r" (tmp) |
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); |
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return result; |
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} |
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#endif |
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#if defined(__i386__) || defined(__x86_64__) |
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#ifdef __SMP__ |
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# define LOCK "lock ; " |
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#else |
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# define LOCK "" |
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#endif |
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static inline char CAS(volatile UInt32 value, UInt32 newvalue, volatile void* addr) |
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{ |
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register char ret; |
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__asm__ __volatile__ ( |
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"# CAS \n\t" |
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LOCK "cmpxchg %2, (%1) \n\t" |
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"sete %0 \n\t" |
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: "=a" (ret) |
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: "c" (addr), "d" (newvalue), "a" (value) |
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); |
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return ret; |
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} |
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#endif |
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#endif |
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static inline long INC_ATOMIC(volatile SInt32* val) |
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{ |
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SInt32 actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual + 1, val)); |
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return actual; |
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} |
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static inline long DEC_ATOMIC(volatile SInt32* val) |
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{ |
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SInt32 actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual - 1, val)); |
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return actual; |
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} |
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static inline long ADD_ATOMIC(volatile SInt32* val, SInt32 addval) |
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{ |
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SInt32 actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual + addval, val)); |
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return actual; |
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} |
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static inline long SUBSTRACT_ATOMIC(volatile SInt32* val, SInt32 addval) |
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{ |
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SInt32 actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual - addval, val)); |
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return actual; |
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} |
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static inline long ZERO_ATOMIC(volatile SInt32* val) |
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{ |
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SInt32 actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, 0, val)); |
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return actual; |
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} |
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#endif |
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