mirror of
https://github.com/Relintai/sdl2_frt.git
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0e45984fa0
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
457 lines
12 KiB
C
457 lines
12 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2015 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_internal.h"
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/* System independent thread management routines for SDL */
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#include "SDL_assert.h"
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#include "SDL_thread.h"
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#include "SDL_thread_c.h"
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#include "SDL_systhread.h"
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#include "../SDL_error_c.h"
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SDL_TLSID
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SDL_TLSCreate()
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{
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static SDL_atomic_t SDL_tls_id;
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return SDL_AtomicIncRef(&SDL_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 *storage;
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storage = SDL_SYS_GetTLSData();
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if (!storage || id == 0 || id > storage->limit) {
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return NULL;
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}
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return storage->array[id-1].data;
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}
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int
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SDL_TLSSet(SDL_TLSID id, const void *value, void (*destructor)(void *))
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{
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SDL_TLSData *storage;
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if (id == 0) {
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return SDL_InvalidParamError("id");
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}
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storage = SDL_SYS_GetTLSData();
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if (!storage || (id > storage->limit)) {
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unsigned int i, oldlimit, newlimit;
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oldlimit = storage ? storage->limit : 0;
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newlimit = (id + TLS_ALLOC_CHUNKSIZE);
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storage = (SDL_TLSData *)SDL_realloc(storage, sizeof(*storage)+(newlimit-1)*sizeof(storage->array[0]));
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if (!storage) {
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return SDL_OutOfMemory();
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}
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storage->limit = newlimit;
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for (i = oldlimit; i < newlimit; ++i) {
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storage->array[i].data = NULL;
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storage->array[i].destructor = NULL;
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}
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if (SDL_SYS_SetTLSData(storage) != 0) {
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return -1;
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}
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}
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storage->array[id-1].data = SDL_const_cast(void*, value);
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storage->array[id-1].destructor = destructor;
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return 0;
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}
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static void
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SDL_TLSCleanup()
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{
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SDL_TLSData *storage;
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storage = SDL_SYS_GetTLSData();
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if (storage) {
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unsigned int i;
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for (i = 0; i < storage->limit; ++i) {
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if (storage->array[i].destructor) {
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storage->array[i].destructor(storage->array[i].data);
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}
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}
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SDL_SYS_SetTLSData(NULL);
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SDL_free(storage);
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}
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}
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/* This is a generic implementation of thread-local storage which doesn't
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require additional OS support.
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It is not especially efficient and doesn't clean up thread-local storage
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as threads exit. If there is a real OS that doesn't support thread-local
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storage this implementation should be improved to be production quality.
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*/
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typedef struct SDL_TLSEntry {
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SDL_threadID thread;
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SDL_TLSData *storage;
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struct SDL_TLSEntry *next;
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} SDL_TLSEntry;
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static SDL_mutex *SDL_generic_TLS_mutex;
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static SDL_TLSEntry *SDL_generic_TLS;
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SDL_TLSData *
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SDL_Generic_GetTLSData()
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{
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SDL_threadID thread = SDL_ThreadID();
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SDL_TLSEntry *entry;
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SDL_TLSData *storage = NULL;
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#if !SDL_THREADS_DISABLED
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if (!SDL_generic_TLS_mutex) {
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static SDL_SpinLock tls_lock;
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SDL_AtomicLock(&tls_lock);
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if (!SDL_generic_TLS_mutex) {
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SDL_mutex *mutex = SDL_CreateMutex();
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SDL_MemoryBarrierRelease();
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SDL_generic_TLS_mutex = mutex;
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if (!SDL_generic_TLS_mutex) {
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SDL_AtomicUnlock(&tls_lock);
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return NULL;
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}
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}
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SDL_AtomicUnlock(&tls_lock);
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}
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#endif /* SDL_THREADS_DISABLED */
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SDL_MemoryBarrierAcquire();
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SDL_LockMutex(SDL_generic_TLS_mutex);
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for (entry = SDL_generic_TLS; entry; entry = entry->next) {
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if (entry->thread == thread) {
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storage = entry->storage;
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break;
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}
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}
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#if !SDL_THREADS_DISABLED
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SDL_UnlockMutex(SDL_generic_TLS_mutex);
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#endif
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return storage;
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}
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int
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SDL_Generic_SetTLSData(SDL_TLSData *storage)
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{
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SDL_threadID thread = SDL_ThreadID();
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SDL_TLSEntry *prev, *entry;
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/* SDL_Generic_GetTLSData() is always called first, so we can assume SDL_generic_TLS_mutex */
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SDL_LockMutex(SDL_generic_TLS_mutex);
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prev = NULL;
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for (entry = SDL_generic_TLS; entry; entry = entry->next) {
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if (entry->thread == thread) {
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if (storage) {
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entry->storage = storage;
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} else {
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if (prev) {
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prev->next = entry->next;
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} else {
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SDL_generic_TLS = entry->next;
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}
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SDL_free(entry);
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}
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break;
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}
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prev = entry;
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}
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if (!entry) {
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entry = (SDL_TLSEntry *)SDL_malloc(sizeof(*entry));
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if (entry) {
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entry->thread = thread;
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entry->storage = storage;
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entry->next = SDL_generic_TLS;
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SDL_generic_TLS = entry;
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}
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}
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SDL_UnlockMutex(SDL_generic_TLS_mutex);
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if (!entry) {
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return SDL_OutOfMemory();
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}
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return 0;
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}
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/* Routine to get the thread-specific error variable */
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SDL_error *
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SDL_GetErrBuf(void)
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{
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static SDL_SpinLock tls_lock;
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static SDL_bool tls_being_created;
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static SDL_TLSID tls_errbuf;
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static SDL_error SDL_global_errbuf;
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const SDL_error *ALLOCATION_IN_PROGRESS = (SDL_error *)-1;
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SDL_error *errbuf;
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/* tls_being_created is there simply to prevent recursion if SDL_TLSCreate() fails.
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It also means it's possible for another thread to also use SDL_global_errbuf,
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but that's very unlikely and hopefully won't cause issues.
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*/
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if (!tls_errbuf && !tls_being_created) {
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SDL_AtomicLock(&tls_lock);
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if (!tls_errbuf) {
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SDL_TLSID slot;
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tls_being_created = SDL_TRUE;
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slot = SDL_TLSCreate();
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tls_being_created = SDL_FALSE;
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SDL_MemoryBarrierRelease();
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tls_errbuf = slot;
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}
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SDL_AtomicUnlock(&tls_lock);
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}
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if (!tls_errbuf) {
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return &SDL_global_errbuf;
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}
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SDL_MemoryBarrierAcquire();
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errbuf = (SDL_error *)SDL_TLSGet(tls_errbuf);
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if (errbuf == ALLOCATION_IN_PROGRESS) {
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return &SDL_global_errbuf;
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}
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if (!errbuf) {
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/* Mark that we're in the middle of allocating our buffer */
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SDL_TLSSet(tls_errbuf, ALLOCATION_IN_PROGRESS, NULL);
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errbuf = (SDL_error *)SDL_malloc(sizeof(*errbuf));
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if (!errbuf) {
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SDL_TLSSet(tls_errbuf, NULL, NULL);
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return &SDL_global_errbuf;
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}
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SDL_zerop(errbuf);
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SDL_TLSSet(tls_errbuf, errbuf, SDL_free);
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}
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return errbuf;
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}
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/* Arguments and callback to setup and run the user thread function */
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typedef struct
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{
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int (SDLCALL * func) (void *);
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void *data;
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SDL_Thread *info;
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SDL_sem *wait;
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} thread_args;
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void
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SDL_RunThread(void *data)
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{
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thread_args *args = (thread_args *) data;
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int (SDLCALL * userfunc) (void *) = args->func;
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void *userdata = args->data;
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SDL_Thread *thread = args->info;
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int *statusloc = &thread->status;
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/* Perform any system-dependent setup - this function may not fail */
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SDL_SYS_SetupThread(thread->name);
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/* Get the thread id */
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thread->threadid = SDL_ThreadID();
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/* Wake up the parent thread */
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SDL_SemPost(args->wait);
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/* Run the function */
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*statusloc = userfunc(userdata);
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/* Clean up thread-local storage */
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SDL_TLSCleanup();
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/* Mark us as ready to be joined (or detached) */
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if (!SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_ALIVE, SDL_THREAD_STATE_ZOMBIE)) {
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/* Clean up if something already detached us. */
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if (SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_DETACHED, SDL_THREAD_STATE_CLEANED)) {
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if (thread->name) {
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SDL_free(thread->name);
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}
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SDL_free(thread);
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}
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}
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}
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#ifdef SDL_CreateThread
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#undef SDL_CreateThread
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#endif
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#if SDL_DYNAMIC_API
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#define SDL_CreateThread SDL_CreateThread_REAL
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#endif
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#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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DECLSPEC SDL_Thread *SDLCALL
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SDL_CreateThread(int (SDLCALL * fn) (void *),
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const char *name, void *data,
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pfnSDL_CurrentBeginThread pfnBeginThread,
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pfnSDL_CurrentEndThread pfnEndThread)
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#else
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DECLSPEC SDL_Thread *SDLCALL
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SDL_CreateThread(int (SDLCALL * fn) (void *),
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const char *name, void *data)
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#endif
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{
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SDL_Thread *thread;
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thread_args *args;
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int ret;
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/* Allocate memory for the thread info structure */
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thread = (SDL_Thread *) SDL_malloc(sizeof(*thread));
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if (thread == NULL) {
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SDL_OutOfMemory();
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return (NULL);
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}
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SDL_zerop(thread);
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thread->status = -1;
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SDL_AtomicSet(&thread->state, SDL_THREAD_STATE_ALIVE);
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/* Set up the arguments for the thread */
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if (name != NULL) {
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thread->name = SDL_strdup(name);
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if (thread->name == NULL) {
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SDL_OutOfMemory();
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SDL_free(thread);
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return (NULL);
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}
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}
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/* Set up the arguments for the thread */
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args = (thread_args *) SDL_malloc(sizeof(*args));
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if (args == NULL) {
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SDL_OutOfMemory();
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if (thread->name) {
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SDL_free(thread->name);
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}
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SDL_free(thread);
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return (NULL);
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}
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args->func = fn;
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args->data = data;
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args->info = thread;
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args->wait = SDL_CreateSemaphore(0);
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if (args->wait == NULL) {
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if (thread->name) {
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SDL_free(thread->name);
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}
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SDL_free(thread);
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SDL_free(args);
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return (NULL);
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}
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/* Create the thread and go! */
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#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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#else
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ret = SDL_SYS_CreateThread(thread, args);
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#endif
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if (ret >= 0) {
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/* Wait for the thread function to use arguments */
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SDL_SemWait(args->wait);
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} else {
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/* Oops, failed. Gotta free everything */
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if (thread->name) {
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SDL_free(thread->name);
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}
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SDL_free(thread);
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thread = NULL;
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}
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SDL_DestroySemaphore(args->wait);
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SDL_free(args);
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/* Everything is running now */
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return (thread);
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}
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SDL_threadID
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SDL_GetThreadID(SDL_Thread * thread)
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{
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SDL_threadID id;
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if (thread) {
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id = thread->threadid;
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} else {
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id = SDL_ThreadID();
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}
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return id;
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}
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const char *
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SDL_GetThreadName(SDL_Thread * thread)
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{
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if (thread) {
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return thread->name;
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} else {
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return NULL;
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}
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}
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int
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SDL_SetThreadPriority(SDL_ThreadPriority priority)
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{
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return SDL_SYS_SetThreadPriority(priority);
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}
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void
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SDL_WaitThread(SDL_Thread * thread, int *status)
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{
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if (thread) {
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SDL_SYS_WaitThread(thread);
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if (status) {
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*status = thread->status;
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}
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if (thread->name) {
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SDL_free(thread->name);
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}
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SDL_free(thread);
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}
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}
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void
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SDL_DetachThread(SDL_Thread * thread)
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{
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if (!thread) {
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return;
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}
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/* Grab dibs if the state is alive+joinable. */
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if (SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_ALIVE, SDL_THREAD_STATE_DETACHED)) {
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SDL_SYS_DetachThread(thread);
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} else {
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/* all other states are pretty final, see where we landed. */
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const int thread_state = SDL_AtomicGet(&thread->state);
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if ((thread_state == SDL_THREAD_STATE_DETACHED) || (thread_state == SDL_THREAD_STATE_CLEANED)) {
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return; /* already detached (you shouldn't call this twice!) */
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} else if (thread_state == SDL_THREAD_STATE_ZOMBIE) {
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SDL_WaitThread(thread, NULL); /* already done, clean it up. */
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} else {
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SDL_assert(0 && "Unexpected thread state");
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}
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}
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}
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/* vi: set ts=4 sw=4 expandtab: */
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