src/thread/beos/SDL_systls.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 10 Jul 2013 02:37:57 -0700
changeset 7392 7e32fcb41b44
parent 7391 a29895dc5e9a
child 7393 358696c354a8
permissions -rw-r--r--
Fixed Haiku build
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#include "SDL_thread.h"
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#if SDL_THREAD_BEOS
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#include <support/TLS.h>
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#define TLS_ALLOC_CHUNKSIZE 8
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typedef struct {
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    int limit;
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    void *data[1];
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} SDL_TLSData;
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static SDL_SpinLock tls_lock;
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static int32 thread_local_storage = B_NO_MEMORY;
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static SDL_atomic_t tls_id;
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SDL_TLSID
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SDL_TLSCreate()
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{
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    if (thread_local_storage == B_NO_MEMORY) {
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        SDL_AtomicLock(&tls_lock);
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        if (thread_local_storage == B_NO_MEMORY) {
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            thread_local_storage = tls_allocate();
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            if (thread_local_storage == B_NO_MEMORY) {
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                SDL_SetError("tls_allocate() failed");
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                SDL_AtomicUnlock(&tls_lock);
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                return 0;
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            }
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        }
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        SDL_AtomicUnlock(&tls_lock);
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    }
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    return SDL_AtomicIncRef(&tls_id)+1;
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}
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void *
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SDL_TLSGet(SDL_TLSID id)
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{
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    SDL_TLSData *data;
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    data = (SDL_TLSData *)tls_get(thread_local_storage);
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    if (!data || id <= 0 || id > data->limit) {
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        return NULL;
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    }
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    return data->data[id-1];
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}
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int
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SDL_TLSSet(SDL_TLSID id, const void *value)
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{
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    SDL_TLSData *data;
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    if (thread_local_storage == B_NO_MEMORY || id <= 0) {
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        return SDL_InvalidParamError(id);
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    }
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    data = (SDL_TLSData *)tls_get(thread_local_storage);
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    if (!data || id > data->limit) {
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        int i, oldlimit, newlimit;
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        oldlimit = data ? data->limit : 0;
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        newlimit = (id + TLS_ALLOC_CHUNKSIZE);
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        data = (SDL_TLSData *)SDL_realloc(data, sizeof(*data)+(newlimit-1)*sizeof(void*));
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        if (!data) {
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            return SDL_OutOfMemory();
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        }
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        data->limit = newlimit;
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        for (i = oldlimit; i < newlimit; ++i) {
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            data->data[i] = NULL;
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        }
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        tls_set(thread_local_storage, data);
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    }
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    data->data[id-1] = SDL_const_cast(void*, value);
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    return 0;
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}
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#endif /* SDL_THREAD_BEOS */
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/* vi: set ts=4 sw=4 expandtab: */