d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
380 lines
7.1 KiB
C++
380 lines
7.1 KiB
C++
/*************************************************************************/
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/* safe_refcount.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef SAFE_REFCOUNT_H
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#define SAFE_REFCOUNT_H
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#include "os/mutex.h"
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/* x86/x86_64 GCC */
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#include "platform_config.h"
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#ifdef NO_THREADS
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struct SafeRefCount {
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int count;
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public:
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// destroy() is called when weak_count_ drops to zero.
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bool ref() { //true on success
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if (count==0)
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return false;
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count++;
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return true;
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}
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int refval() { //true on success
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if (count==0)
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return 0;
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count++;
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return count;
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}
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bool unref() { // true if must be disposed of
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if (count>0)
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count--;
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return count==0;
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}
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long get() const { // nothrow
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return static_cast<int const volatile &>( count );
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}
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void init(int p_value=1) {
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count=p_value;
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};
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};
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#else
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#if defined( PLATFORM_REFCOUNT )
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#include "platform_refcount.h"
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#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
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#define REFCOUNT_T volatile int
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#define REFCOUNT_GET_T int const volatile&
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static inline int atomic_conditional_increment( volatile int * pw ) {
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// int rv = *pw;
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// if( rv != 0 ) ++*pw;
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// return rv;
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int rv, tmp;
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__asm__
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(
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"movl %0, %%eax\n\t"
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"0:\n\t"
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"test %%eax, %%eax\n\t"
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"je 1f\n\t"
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"movl %%eax, %2\n\t"
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"incl %2\n\t"
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"lock\n\t"
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"cmpxchgl %2, %0\n\t"
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"jne 0b\n\t"
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"1:":
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"=m"( *pw ), "=&a"( rv ), "=&r"( tmp ): // outputs (%0, %1, %2)
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"m"( *pw ): // input (%3)
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"cc" // clobbers
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);
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return rv;
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}
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static inline int atomic_decrement( volatile int *pw) {
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// return --(*pw);
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unsigned char rv;
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__asm__
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(
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"lock\n\t"
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"decl %0\n\t"
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"setne %1":
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"=m" (*pw), "=qm" (rv):
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"m" (*pw):
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"memory"
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);
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return static_cast<int>(rv);
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}
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/* PowerPC32/64 GCC */
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#elif ( defined( __GNUC__ ) ) && ( defined( __powerpc__ ) || defined( __ppc__ ) )
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#define REFCOUNT_T int
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#define REFCOUNT_GET_T int const volatile&
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inline int atomic_conditional_increment( int * pw )
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{
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// if( *pw != 0 ) ++*pw;
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// return *pw;
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int rv;
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__asm__
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(
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"0:\n\t"
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"lwarx %1, 0, %2\n\t"
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"cmpwi %1, 0\n\t"
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"beq 1f\n\t"
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"addi %1, %1, 1\n\t"
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"1:\n\t"
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"stwcx. %1, 0, %2\n\t"
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"bne- 0b":
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"=m"( *pw ), "=&b"( rv ):
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"r"( pw ), "m"( *pw ):
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"cc"
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);
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return rv;
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}
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inline int atomic_decrement( int * pw )
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{
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// return --*pw;
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int rv;
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__asm__ __volatile__
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(
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"sync\n\t"
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"0:\n\t"
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"lwarx %1, 0, %2\n\t"
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"addi %1, %1, -1\n\t"
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"stwcx. %1, 0, %2\n\t"
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"bne- 0b\n\t"
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"isync":
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"=m"( *pw ), "=&b"( rv ):
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"r"( pw ), "m"( *pw ):
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"memory", "cc"
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);
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return rv;
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}
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/* CW ARM */
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#elif defined( __GNUC__ ) && ( defined( __arm__ ) )
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#define REFCOUNT_T int
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#define REFCOUNT_GET_T int const volatile&
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inline int atomic_conditional_increment(volatile int* v)
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{
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int t;
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int tmp;
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__asm__ __volatile__(
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"1: ldrex %0, [%2] \n"
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" cmp %0, #0 \n"
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" beq 2f \n"
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" add %0, %0, #1 \n"
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"2: \n"
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" strex %1, %0, [%2] \n"
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" cmp %1, #0 \n"
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" bne 1b \n"
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: "=&r" (t), "=&r" (tmp)
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: "r" (v)
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: "cc", "memory");
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return t;
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}
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inline int atomic_decrement(volatile int* v)
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{
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int t;
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int tmp;
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__asm__ __volatile__(
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"1: ldrex %0, [%2] \n"
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" add %0, %0, #-1 \n"
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" strex %1, %0, [%2] \n"
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" cmp %1, #0 \n"
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" bne 1b \n"
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: "=&r" (t), "=&r" (tmp)
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: "r" (v)
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: "cc", "memory");
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return t;
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}
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/* CW PPC */
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#elif ( defined( __MWERKS__ ) ) && defined( __POWERPC__ )
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inline long atomic_conditional_increment( register long * pw )
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{
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register int a;
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asm
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{
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loop:
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lwarx a, 0, pw
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cmpwi a, 0
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beq store
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addi a, a, 1
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store:
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stwcx. a, 0, pw
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bne- loop
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}
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return a;
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}
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inline long atomic_decrement( register long * pw )
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{
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register int a;
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asm {
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sync
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loop:
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lwarx a, 0, pw
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addi a, a, -1
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stwcx. a, 0, pw
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bne- loop
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isync
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}
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return a;
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}
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/* Any Windows (MSVC) */
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#elif defined( _MSC_VER )
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// made functions to not pollute namespace..
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#define REFCOUNT_T long
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#define REFCOUNT_GET_T long const volatile&
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long atomic_conditional_increment( register long * pw );
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long atomic_decrement( register long * pw );
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#if 0
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#elif defined( __GNUC__ ) && defined( ARMV6_ENABLED)
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#endif
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#else
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#error This platform cannot use safe refcount, compile with NO_THREADS or implement it.
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#endif
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struct SafeRefCount {
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REFCOUNT_T count;
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public:
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// destroy() is called when weak_count_ drops to zero.
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bool ref() { //true on success
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return atomic_conditional_increment( &count ) != 0;
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}
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int refval() { //true on success
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return atomic_conditional_increment( &count );
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}
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bool unref() { // true if must be disposed of
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if( atomic_decrement ( &count ) == 0 ) {
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return true;
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}
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return false;
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}
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long get() const { // nothrow
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return static_cast<REFCOUNT_GET_T>( count );
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}
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void init(int p_value=1) {
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count=p_value;
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};
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};
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#endif // no thread safe
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#endif
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