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Implemented an API for thread-local storage: SDL_TLSCreate(), SDL_TLSSet(), SDL_TLSGet()

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This commit is contained in:
Sam Lantinga 2013-07-10 02:32:04 -07:00
parent ab91b4ce14
commit bfcb08d569
14 changed files with 618 additions and 156 deletions
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169
src/thread/SDL_thread.c
View file

@ -22,158 +22,46 @@
/* System independent thread management routines for SDL */
#include "SDL_mutex.h"
#include "SDL_thread.h"
#include "SDL_thread_c.h"
#include "SDL_systhread.h"
#include "../SDL_error_c.h"
#define ARRAY_CHUNKSIZE 32
/* The array of threads currently active in the application
(except the main thread)
The manipulation of an array here is safer than using a linked list.
*/
static int SDL_maxthreads = 0;
static int SDL_numthreads = 0;
static SDL_Thread **SDL_Threads = NULL;
static SDL_mutex *thread_lock = NULL;
static int
SDL_ThreadsInit(void)
{
int retval;
retval = 0;
thread_lock = SDL_CreateMutex();
if (thread_lock == NULL) {
retval = -1;
}
return (retval);
}
/* This should never be called...
If this is called by SDL_Quit(), we don't know whether or not we should
clean up threads here. If any threads are still running after this call,
they will no longer have access to any per-thread data.
*/
#if 0
static void
SDL_ThreadsQuit(void)
{
SDL_mutex *mutex;
mutex = thread_lock;
thread_lock = NULL;
if (mutex != NULL) {
SDL_DestroyMutex(mutex);
}
}
#endif
/* Routines for manipulating the thread list */
static void
SDL_AddThread(SDL_Thread * thread)
{
/* WARNING:
If the very first threads are created simultaneously, then
there could be a race condition causing memory corruption.
In practice, this isn't a problem because by definition there
is only one thread running the first time this is called.
*/
if (!thread_lock) {
if (SDL_ThreadsInit() < 0) {
return;
}
}
SDL_LockMutex(thread_lock);
/* Expand the list of threads, if necessary */
#ifdef DEBUG_THREADS
printf("Adding thread (%d already - %d max)\n",
SDL_numthreads, SDL_maxthreads);
#endif
if (SDL_numthreads == SDL_maxthreads) {
SDL_Thread **threads;
threads = (SDL_Thread **) SDL_realloc(SDL_Threads,
(SDL_maxthreads +
ARRAY_CHUNKSIZE) *
(sizeof *threads));
if (threads == NULL) {
SDL_OutOfMemory();
goto done;
}
SDL_maxthreads += ARRAY_CHUNKSIZE;
SDL_Threads = threads;
}
SDL_Threads[SDL_numthreads++] = thread;
done:
SDL_mutexV(thread_lock);
}
static void
SDL_DelThread(SDL_Thread * thread)
{
int i;
if (!thread_lock) {
return;
}
SDL_LockMutex(thread_lock);
for (i = 0; i < SDL_numthreads; ++i) {
if (thread == SDL_Threads[i]) {
break;
}
}
if (i < SDL_numthreads) {
if (--SDL_numthreads > 0) {
while (i < SDL_numthreads) {
SDL_Threads[i] = SDL_Threads[i + 1];
++i;
}
} else {
SDL_maxthreads = 0;
SDL_free(SDL_Threads);
SDL_Threads = NULL;
}
#ifdef DEBUG_THREADS
printf("Deleting thread (%d left - %d max)\n",
SDL_numthreads, SDL_maxthreads);
#endif
}
SDL_mutexV(thread_lock);
#if 0 /* There could be memory corruption if another thread is starting */
if (SDL_Threads == NULL) {
SDL_ThreadsQuit();
}
#endif
}
/* The default (non-thread-safe) global error variable */
static SDL_error SDL_global_error;
/* Routine to get the thread-specific error variable */
SDL_error *
SDL_GetErrBuf(void)
{
static SDL_SpinLock spinlock;
static SDL_bool tls_being_created;
static SDL_TLSID tls_errbuf;
static SDL_error SDL_global_errbuf;
SDL_error *errbuf;
errbuf = &SDL_global_error;
if (SDL_Threads) {
int i;
SDL_threadID this_thread;
this_thread = SDL_ThreadID();
SDL_LockMutex(thread_lock);
for (i = 0; i < SDL_numthreads; ++i) {
if (this_thread == SDL_Threads[i]->threadid) {
errbuf = &SDL_Threads[i]->errbuf;
break;
}
if (!tls_errbuf && !tls_being_created) {
SDL_AtomicLock(&spinlock);
if (!tls_errbuf) {
/* SDL_TLSCreate() could fail and call SDL_SetError() */
tls_being_created = SDL_TRUE;
tls_errbuf = SDL_TLSCreate();
tls_being_created = SDL_FALSE;
}
SDL_mutexV(thread_lock);
SDL_AtomicUnlock(&spinlock);
}
return (errbuf);
if (!tls_errbuf) {
return &SDL_global_errbuf;
}
errbuf = SDL_TLSGet(tls_errbuf);
if (!errbuf) {
errbuf = (SDL_error *)SDL_malloc(sizeof(*errbuf));
if (!errbuf) {
return &SDL_global_errbuf;
}
SDL_zerop(errbuf);
SDL_TLSSet(tls_errbuf, errbuf);
}
return errbuf;
}
@ -264,9 +152,6 @@ SDL_CreateThread(int (SDLCALL * fn) (void *),
return (NULL);
}
/* Add the thread to the list of available threads */
SDL_AddThread(thread);
/* Create the thread and go! */
#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
@ -278,7 +163,6 @@ SDL_CreateThread(int (SDLCALL * fn) (void *),
SDL_SemWait(args->wait);
} else {
/* Oops, failed. Gotta free everything */
SDL_DelThread(thread);
SDL_free(thread->name);
SDL_free(thread);
thread = NULL;
@ -323,7 +207,6 @@ SDL_WaitThread(SDL_Thread * thread, int *status)
if (status) {
*status = thread->status;
}
SDL_DelThread(thread);
SDL_free(thread->name);
SDL_free(thread);
}

106
src/thread/beos/SDL_systls.c Normal file
View file

@ -0,0 +1,106 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#include "SDL_thread.h"
#if SDL_THREAD_BEOS
#include <support/TLS.h>
#define TLS_ALLOC_CHUNKSIZE 8
typedef struct {
int limit;
void *data[1];
} SDL_TLSData;
static SDL_SpinLock tls_lock;
static int32 thread_local_storage = B_NO_MEMORY;
static SDL_atomic_t tls_id;
SDL_TLSID
SDL_TLSCreate()
{
if (thread_local_storage == B_NO_MEMORY) {
SDL_AtomicLock(&tls_lock);
if (thread_local_storage == B_NO_MEMORY) {
thread_local_storage = tls_allocate();
if (thread_local_storage == B_NO_MEMORY) {
SDL_SetError("tls_allocate() failed");
SDL_AtomicUnlock(&tls_lock);
return 0;
}
}
SDL_AtomicUnlock(&tls_lock);
}
return SDL_AtomicIncRef(&tls_id)+1;
}
void *
SDL_TLSGet(SDL_TLSID id)
{
SDL_TLSData *data;
data = (SDL_TLSData *)tls_get(thread_local_storage);
if (!data || id <= 0 || id > data->limit) {
return NULL;
}
return data->data[id-1];
}
int
SDL_TLSSet(SDL_TLSID id, const void *value)
{
SDL_TLSData *data;
if (thread_local_storage == B_NO_MEMORY || id <= 0) {
return SDL_InvalidParamError(id);
}
data = (SDL_TLSData *)tls_get(thread_local_storage);
if (!data || id > data->limit) {
int i, oldlimit, newlimit;
oldlimit = data ? data->limit : 0;
newlimit = (id + TLS_ALLOC_CHUNKSIZE);
data = (SDL_TLSData *)SDL_realloc(data, sizeof(*data)+(newlimit-1)*sizeof(void*));
if (!data) {
return SDL_OutOfMemory();
}
data->limit = newlimit;
for (i = oldlimit; i < newlimit; ++i) {
data->data[i] = NULL;
}
if (!tls_set(thread_local_storage, data)) {
return SDL_SetError("TlsSetValue() failed");
}
}
data->data[id-1] = SDL_const_cast(void*, value);
return 0;
}
#endif /* SDL_THREAD_BEOS */
/* vi: set ts=4 sw=4 expandtab: */

163
src/thread/generic/SDL_systls.c Normal file
View file

@ -0,0 +1,163 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#include "SDL_thread.h"
/* This is a generic implementation of thread-local storage which doesn't
require additional OS support.
It is not especially efficient and doesn't clean up thread-local storage
as threads exit. If there is a real OS that doesn't support thread-local
storage this implementation should be improved to be production quality.
*/
#define TLS_ALLOC_CHUNKSIZE 8
typedef struct {
int limit;
void *data[1];
} SDL_TLSData;
typedef struct SDL_TLSEntry {
SDL_threadID thread;
SDL_TLSData *data;
struct SDL_TLSEntry *next;
} SDL_TLSEntry;
static SDL_SpinLock tls_lock;
static SDL_mutex *tls_mutex;
static SDL_TLSEntry *thread_local_storage;
static SDL_atomic_t tls_id;
static SDL_TLSData *GetTLSData()
{
SDL_threadID thread = SDL_ThreadID();
SDL_TLSEntry *entry;
SDL_TLSData *data = NULL;
if (!tls_mutex) {
SDL_AtomicLock(&tls_lock);
if (!tls_mutex) {
tls_mutex = SDL_CreateMutex();
if (!tls_mutex) {
SDL_AtomicUnlock(&tls_lock);
return NULL;
}
}
SDL_AtomicUnlock(&tls_lock);
}
SDL_LockMutex(tls_mutex);
for (entry = thread_local_storage; entry; entry = entry->next) {
if (entry->thread == thread) {
data = entry->data;
break;
}
}
SDL_UnlockMutex(tls_mutex);
return data;
}
static int SetTLSData(SDL_TLSData *data)
{
SDL_threadID thread = SDL_ThreadID();
SDL_TLSEntry *entry;
/* GetTLSData() is always called first, so we can assume tls_mutex */
SDL_LockMutex(tls_mutex);
for (entry = thread_local_storage; entry; entry = entry->next) {
if (entry->thread == thread) {
entry->data = data;
break;
}
}
if (!entry) {
entry = (SDL_TLSEntry *)SDL_malloc(sizeof(*entry));
if (entry) {
entry->thread = thread;
entry->data = data;
entry->next = thread_local_storage;
thread_local_storage = entry;
}
}
SDL_UnlockMutex(tls_mutex);
if (!entry) {
return SDL_OutOfMemory();
}
return 0;
}
SDL_TLSID
SDL_TLSCreate()
{
return SDL_AtomicIncRef(&tls_id)+1;
}
void *
SDL_TLSGet(SDL_TLSID id)
{
SDL_TLSData *data;
data = GetTLSData();
if (!data || id <= 0 || id > data->limit) {
return NULL;
}
return data->data[id-1];
}
int
SDL_TLSSet(SDL_TLSID id, const void *value)
{
SDL_TLSData *data;
if (id <= 0) {
return SDL_InvalidParamError(id);
}
data = GetTLSData();
if (!data || id > data->limit) {
int i, oldlimit, newlimit;
oldlimit = data ? data->limit : 0;
newlimit = (id + TLS_ALLOC_CHUNKSIZE);
data = (SDL_TLSData *)SDL_realloc(data, sizeof(*data)+(newlimit-1)*sizeof(void*));
if (!data) {
return SDL_OutOfMemory();
}
data->limit = newlimit;
for (i = oldlimit; i < newlimit; ++i) {
data->data[i] = NULL;
}
if (SetTLSData(data) != 0) {
return -1;
}
}
data->data[id-1] = SDL_const_cast(void*, value);
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */

101
src/thread/pthread/SDL_systls.c Normal file
View file

@ -0,0 +1,101 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#include "SDL_thread.h"
#include <pthread.h>
#define TLS_ALLOC_CHUNKSIZE 8
typedef struct {
int limit;
void *data[1];
} SDL_TLSData;
static SDL_SpinLock tls_lock;
static pthread_key_t thread_local_storage;
static SDL_atomic_t tls_id;
SDL_TLSID
SDL_TLSCreate()
{
if (!thread_local_storage) {
SDL_AtomicLock(&tls_lock);
if (!thread_local_storage) {
if (pthread_key_create(&thread_local_storage, NULL) != 0) {
SDL_SetError("pthread_key_create() failed");
SDL_AtomicUnlock(&tls_lock);
return 0;
}
}
SDL_AtomicUnlock(&tls_lock);
}
return SDL_AtomicIncRef(&tls_id)+1;
}
void *
SDL_TLSGet(SDL_TLSID id)
{
SDL_TLSData *data;
data = (SDL_TLSData *)pthread_getspecific(thread_local_storage);
if (!data || id <= 0 || id > data->limit) {
return NULL;
}
return data->data[id-1];
}
int
SDL_TLSSet(SDL_TLSID id, const void *value)
{
SDL_TLSData *data;
if (!thread_local_storage || id <= 0) {
return SDL_InvalidParamError(id);
}
data = (SDL_TLSData *)pthread_getspecific(thread_local_storage);
if (!data || id > data->limit) {
int i, oldlimit, newlimit;
oldlimit = data ? data->limit : 0;
newlimit = (id + TLS_ALLOC_CHUNKSIZE);
data = (SDL_TLSData *)SDL_realloc(data, sizeof(*data)+(newlimit-1)*sizeof(void*));
if (!data) {
return SDL_OutOfMemory();
}
data->limit = newlimit;
for (i = oldlimit; i < newlimit; ++i) {
data->data[i] = NULL;
}
if (pthread_setspecific(thread_local_storage, data) != 0) {
return SDL_SetError("pthread_setspecific() failed");
}
}
data->data[id-1] = SDL_const_cast(void*, value);
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */

106
src/thread/windows/SDL_systls.c Normal file
View file

@ -0,0 +1,106 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#include "SDL_thread.h"
#if SDL_THREAD_WINDOWS
#include "../../core/windows/SDL_windows.h"
#define TLS_ALLOC_CHUNKSIZE 8
typedef struct {
int limit;
void *data[1];
} SDL_TLSData;
static SDL_SpinLock tls_lock;
static DWORD thread_local_storage = TLS_OUT_OF_INDEXES;
static SDL_atomic_t tls_id;
SDL_TLSID
SDL_TLSCreate()
{
if (thread_local_storage == TLS_OUT_OF_INDEXES) {
SDL_AtomicLock(&tls_lock);
if (thread_local_storage == TLS_OUT_OF_INDEXES) {
thread_local_storage = TlsAlloc();
if (thread_local_storage == TLS_OUT_OF_INDEXES) {
SDL_SetError("TlsAlloc() failed");
SDL_AtomicUnlock(&tls_lock);
return 0;
}
}
SDL_AtomicUnlock(&tls_lock);
}
return SDL_AtomicIncRef(&tls_id)+1;
}
void *
SDL_TLSGet(SDL_TLSID id)
{
SDL_TLSData *data;
data = (SDL_TLSData *)TlsGetValue(thread_local_storage);
if (!data || id <= 0 || id > data->limit) {
return NULL;
}
return data->data[id-1];
}
int
SDL_TLSSet(SDL_TLSID id, const void *value)
{
SDL_TLSData *data;
if (thread_local_storage == TLS_OUT_OF_INDEXES || id <= 0) {
return SDL_InvalidParamError(id);
}
data = (SDL_TLSData *)TlsGetValue(thread_local_storage);
if (!data || id > data->limit) {
int i, oldlimit, newlimit;
oldlimit = data ? data->limit : 0;
newlimit = (id + TLS_ALLOC_CHUNKSIZE);
data = (SDL_TLSData *)SDL_realloc(data, sizeof(*data)+(newlimit-1)*sizeof(void*));
if (!data) {
return SDL_OutOfMemory();
}
data->limit = newlimit;
for (i = oldlimit; i < newlimit; ++i) {
data->data[i] = NULL;
}
if (!TlsSetValue(thread_local_storage, data)) {
return SDL_SetError("TlsSetValue() failed");
}
}
data->data[id-1] = SDL_const_cast(void*, value);
return 0;
}
#endif /* SDL_THREAD_WINDOWS */
/* vi: set ts=4 sw=4 expandtab: */