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https://gitea.wildfiregames.com/0ad/0ad
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98770fa4cc
CAS: uintptr_t->intptr_t to allow use of both cpu_CAS and cpu_AtomicAdd topology: remove non-thread safe caching, expose ApicIds, use ModuleInit x86_x64: use ModuleInit instead of unsafe static flags; zero-init regs instead of just setting ecx ModuleInitState now holds the LibError returned by the init callback (so that the second init doesn't appear to succeed despite the first failing) wnuma: cleanup, add ACPI SLIT relative distance detection This was SVN commit r7741.
90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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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 included
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* 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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/*
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* helpers for module initialization/shutdown.
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*/
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#include "precompiled.h"
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#include "lib/module_init.h"
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#include "lib/sysdep/cpu.h" // cpu_CAS
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// not yet initialized, or already shutdown
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static const ModuleInitState UNINITIALIZED = 0; // value documented in header
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// running user callback - concurrent ModuleInit callers must spin
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static const ModuleInitState BUSY = INFO::ALREADY_EXISTS; // never returned
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// init succeeded; allow shutdown
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static const ModuleInitState INITIALIZED = INFO::SKIPPED;
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LibError ModuleInit(volatile ModuleInitState* initState, LibError (*init)())
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{
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for(;;)
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{
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if(cpu_CAS(initState, UNINITIALIZED, BUSY))
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{
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LibError ret = init();
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*initState = (ret == INFO::OK)? INITIALIZED : ret;
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cpu_MemoryBarrier();
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return ret;
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}
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const ModuleInitState latchedInitState = *initState;
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if(latchedInitState == UNINITIALIZED || latchedInitState == BUSY)
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{
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_mm_pause();
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continue;
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}
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debug_assert(latchedInitState == INITIALIZED || latchedInitState < 0);
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return (LibError)latchedInitState;
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}
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}
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LibError ModuleShutdown(volatile ModuleInitState* initState, void (*shutdown)())
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{
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for(;;)
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{
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if(cpu_CAS(initState, INITIALIZED, BUSY))
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{
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shutdown();
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*initState = UNINITIALIZED;
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cpu_MemoryBarrier();
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return INFO::OK;
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}
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const ModuleInitState latchedInitState = *initState;
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if(latchedInitState == INITIALIZED || latchedInitState == BUSY)
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{
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_mm_pause();
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continue;
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}
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if(latchedInitState == UNINITIALIZED)
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return INFO::SKIPPED;
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debug_assert(latchedInitState < 0);
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return (LibError)latchedInitState;
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}
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}
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