| /** |
| * threads.c: set of generic threading related routines |
| * |
| * See Copyright for the status of this software. |
| * |
| * Gary Pennington <Gary.Pennington@uk.sun.com> |
| * daniel@veillard.com |
| */ |
| |
| #define IN_LIBXML |
| #include "libxml.h" |
| |
| #include <string.h> |
| |
| #include <libxml/threads.h> |
| #include <libxml/globals.h> |
| |
| #ifdef HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #ifdef HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #ifdef HAVE_PTHREAD_H |
| #include <pthread.h> |
| #elif defined HAVE_WIN32_THREADS |
| #define WIN32_LEAN_AND_MEAN |
| #include <windows.h> |
| #ifndef HAVE_COMPILER_TLS |
| #include <process.h> |
| #endif |
| #endif |
| |
| #ifdef HAVE_BEOS_THREADS |
| #include <OS.h> |
| #include <TLS.h> |
| #endif |
| |
| #if defined(SOLARIS) |
| #include <note.h> |
| #endif |
| |
| /* #define DEBUG_THREADS */ |
| |
| #ifdef HAVE_PTHREAD_H |
| |
| #if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 303) && \ |
| defined(__GLIBC__) && defined(__linux__) |
| |
| static int libxml_is_threaded = -1; |
| |
| #define XML_PTHREAD_WEAK |
| |
| #pragma weak pthread_once |
| #pragma weak pthread_getspecific |
| #pragma weak pthread_setspecific |
| #pragma weak pthread_key_create |
| #pragma weak pthread_key_delete |
| #pragma weak pthread_mutex_init |
| #pragma weak pthread_mutex_destroy |
| #pragma weak pthread_mutex_lock |
| #pragma weak pthread_mutex_unlock |
| #pragma weak pthread_cond_init |
| #pragma weak pthread_cond_destroy |
| #pragma weak pthread_cond_wait |
| #pragma weak pthread_equal |
| #pragma weak pthread_self |
| #pragma weak pthread_key_create |
| #pragma weak pthread_key_delete |
| #pragma weak pthread_cond_signal |
| |
| #else /* __GNUC__, __GLIBC__, __linux__ */ |
| |
| static int libxml_is_threaded = 1; |
| |
| #endif /* __GNUC__, __GLIBC__, __linux__ */ |
| |
| #endif /* HAVE_PTHREAD_H */ |
| |
| /* |
| * TODO: this module still uses malloc/free and not xmlMalloc/xmlFree |
| * to avoid some craziness since xmlMalloc/xmlFree may actually |
| * be hosted on allocated blocks needing them for the allocation ... |
| */ |
| |
| /* |
| * xmlMutex are a simple mutual exception locks |
| */ |
| struct _xmlMutex { |
| #ifdef HAVE_PTHREAD_H |
| pthread_mutex_t lock; |
| #elif defined HAVE_WIN32_THREADS |
| HANDLE mutex; |
| #elif defined HAVE_BEOS_THREADS |
| sem_id sem; |
| thread_id tid; |
| #else |
| int empty; |
| #endif |
| }; |
| |
| /* |
| * xmlRMutex are reentrant mutual exception locks |
| */ |
| struct _xmlRMutex { |
| #ifdef HAVE_PTHREAD_H |
| pthread_mutex_t lock; |
| unsigned int held; |
| unsigned int waiters; |
| pthread_t tid; |
| pthread_cond_t cv; |
| #elif defined HAVE_WIN32_THREADS |
| CRITICAL_SECTION cs; |
| unsigned int count; |
| #elif defined HAVE_BEOS_THREADS |
| xmlMutexPtr lock; |
| thread_id tid; |
| int32 count; |
| #else |
| int empty; |
| #endif |
| }; |
| |
| /* |
| * This module still has some internal static data. |
| * - xmlLibraryLock a global lock |
| * - globalkey used for per-thread data |
| */ |
| |
| #ifdef HAVE_PTHREAD_H |
| static pthread_key_t globalkey; |
| static pthread_t mainthread; |
| static pthread_once_t once_control = PTHREAD_ONCE_INIT; |
| static pthread_once_t once_control_init = PTHREAD_ONCE_INIT; |
| static pthread_mutex_t global_init_lock = PTHREAD_MUTEX_INITIALIZER; |
| #elif defined HAVE_WIN32_THREADS |
| #if defined(HAVE_COMPILER_TLS) |
| static __declspec(thread) xmlGlobalState tlstate; |
| static __declspec(thread) int tlstate_inited = 0; |
| #else /* HAVE_COMPILER_TLS */ |
| static DWORD globalkey = TLS_OUT_OF_INDEXES; |
| #endif /* HAVE_COMPILER_TLS */ |
| static DWORD mainthread; |
| static struct { |
| DWORD done; |
| LONG control; |
| } run_once = { 0, 0}; |
| static volatile LPCRITICAL_SECTION global_init_lock = NULL; |
| |
| /* endif HAVE_WIN32_THREADS */ |
| #elif defined HAVE_BEOS_THREADS |
| int32 globalkey = 0; |
| thread_id mainthread = 0; |
| int32 run_once_init = 0; |
| static int32 global_init_lock = -1; |
| static vint32 global_init_count = 0; |
| #endif |
| |
| static xmlRMutexPtr xmlLibraryLock = NULL; |
| |
| #ifdef LIBXML_THREAD_ENABLED |
| static void xmlOnceInit(void); |
| #endif |
| |
| /** |
| * xmlNewMutex: |
| * |
| * xmlNewMutex() is used to allocate a libxml2 token struct for use in |
| * synchronizing access to data. |
| * |
| * Returns a new simple mutex pointer or NULL in case of error |
| */ |
| xmlMutexPtr |
| xmlNewMutex(void) |
| { |
| xmlMutexPtr tok; |
| |
| if ((tok = malloc(sizeof(xmlMutex))) == NULL) |
| return (NULL); |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) |
| pthread_mutex_init(&tok->lock, NULL); |
| #elif defined HAVE_WIN32_THREADS |
| tok->mutex = CreateMutex(NULL, FALSE, NULL); |
| #elif defined HAVE_BEOS_THREADS |
| if ((tok->sem = create_sem(1, "xmlMutex")) < B_OK) { |
| free(tok); |
| return NULL; |
| } |
| tok->tid = -1; |
| #endif |
| return (tok); |
| } |
| |
| /** |
| * xmlFreeMutex: |
| * @tok: the simple mutex |
| * |
| * xmlFreeMutex() is used to reclaim resources associated with a libxml2 token |
| * struct. |
| */ |
| void |
| xmlFreeMutex(xmlMutexPtr tok) |
| { |
| if (tok == NULL) |
| return; |
| |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) |
| pthread_mutex_destroy(&tok->lock); |
| #elif defined HAVE_WIN32_THREADS |
| CloseHandle(tok->mutex); |
| #elif defined HAVE_BEOS_THREADS |
| delete_sem(tok->sem); |
| #endif |
| free(tok); |
| } |
| |
| /** |
| * xmlMutexLock: |
| * @tok: the simple mutex |
| * |
| * xmlMutexLock() is used to lock a libxml2 token. |
| */ |
| void |
| xmlMutexLock(xmlMutexPtr tok) |
| { |
| if (tok == NULL) |
| return; |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) |
| pthread_mutex_lock(&tok->lock); |
| #elif defined HAVE_WIN32_THREADS |
| WaitForSingleObject(tok->mutex, INFINITE); |
| #elif defined HAVE_BEOS_THREADS |
| if (acquire_sem(tok->sem) != B_NO_ERROR) { |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, |
| "xmlMutexLock():BeOS:Couldn't acquire semaphore\n"); |
| #endif |
| } |
| tok->tid = find_thread(NULL); |
| #endif |
| |
| } |
| |
| /** |
| * xmlMutexUnlock: |
| * @tok: the simple mutex |
| * |
| * xmlMutexUnlock() is used to unlock a libxml2 token. |
| */ |
| void |
| xmlMutexUnlock(xmlMutexPtr tok) |
| { |
| if (tok == NULL) |
| return; |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) |
| pthread_mutex_unlock(&tok->lock); |
| #elif defined HAVE_WIN32_THREADS |
| ReleaseMutex(tok->mutex); |
| #elif defined HAVE_BEOS_THREADS |
| if (tok->tid == find_thread(NULL)) { |
| tok->tid = -1; |
| release_sem(tok->sem); |
| } |
| #endif |
| } |
| |
| /** |
| * xmlNewRMutex: |
| * |
| * xmlRNewMutex() is used to allocate a reentrant mutex for use in |
| * synchronizing access to data. token_r is a re-entrant lock and thus useful |
| * for synchronizing access to data structures that may be manipulated in a |
| * recursive fashion. |
| * |
| * Returns the new reentrant mutex pointer or NULL in case of error |
| */ |
| xmlRMutexPtr |
| xmlNewRMutex(void) |
| { |
| xmlRMutexPtr tok; |
| |
| if ((tok = malloc(sizeof(xmlRMutex))) == NULL) |
| return (NULL); |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) { |
| pthread_mutex_init(&tok->lock, NULL); |
| tok->held = 0; |
| tok->waiters = 0; |
| pthread_cond_init(&tok->cv, NULL); |
| } |
| #elif defined HAVE_WIN32_THREADS |
| InitializeCriticalSection(&tok->cs); |
| tok->count = 0; |
| #elif defined HAVE_BEOS_THREADS |
| if ((tok->lock = xmlNewMutex()) == NULL) { |
| free(tok); |
| return NULL; |
| } |
| tok->count = 0; |
| #endif |
| return (tok); |
| } |
| |
| /** |
| * xmlFreeRMutex: |
| * @tok: the reentrant mutex |
| * |
| * xmlRFreeMutex() is used to reclaim resources associated with a |
| * reentrant mutex. |
| */ |
| void |
| xmlFreeRMutex(xmlRMutexPtr tok ATTRIBUTE_UNUSED) |
| { |
| if (tok == NULL) |
| return; |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) { |
| pthread_mutex_destroy(&tok->lock); |
| pthread_cond_destroy(&tok->cv); |
| } |
| #elif defined HAVE_WIN32_THREADS |
| DeleteCriticalSection(&tok->cs); |
| #elif defined HAVE_BEOS_THREADS |
| xmlFreeMutex(tok->lock); |
| #endif |
| free(tok); |
| } |
| |
| /** |
| * xmlRMutexLock: |
| * @tok: the reentrant mutex |
| * |
| * xmlRMutexLock() is used to lock a libxml2 token_r. |
| */ |
| void |
| xmlRMutexLock(xmlRMutexPtr tok) |
| { |
| if (tok == NULL) |
| return; |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded == 0) |
| return; |
| |
| pthread_mutex_lock(&tok->lock); |
| if (tok->held) { |
| if (pthread_equal(tok->tid, pthread_self())) { |
| tok->held++; |
| pthread_mutex_unlock(&tok->lock); |
| return; |
| } else { |
| tok->waiters++; |
| while (tok->held) |
| pthread_cond_wait(&tok->cv, &tok->lock); |
| tok->waiters--; |
| } |
| } |
| tok->tid = pthread_self(); |
| tok->held = 1; |
| pthread_mutex_unlock(&tok->lock); |
| #elif defined HAVE_WIN32_THREADS |
| EnterCriticalSection(&tok->cs); |
| tok->count++; |
| #elif defined HAVE_BEOS_THREADS |
| if (tok->lock->tid == find_thread(NULL)) { |
| tok->count++; |
| return; |
| } else { |
| xmlMutexLock(tok->lock); |
| tok->count = 1; |
| } |
| #endif |
| } |
| |
| /** |
| * xmlRMutexUnlock: |
| * @tok: the reentrant mutex |
| * |
| * xmlRMutexUnlock() is used to unlock a libxml2 token_r. |
| */ |
| void |
| xmlRMutexUnlock(xmlRMutexPtr tok ATTRIBUTE_UNUSED) |
| { |
| if (tok == NULL) |
| return; |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded == 0) |
| return; |
| |
| pthread_mutex_lock(&tok->lock); |
| tok->held--; |
| if (tok->held == 0) { |
| if (tok->waiters) |
| pthread_cond_signal(&tok->cv); |
| memset(&tok->tid, 0, sizeof(tok->tid)); |
| } |
| pthread_mutex_unlock(&tok->lock); |
| #elif defined HAVE_WIN32_THREADS |
| if (tok->count > 0) { |
| tok->count--; |
| LeaveCriticalSection(&tok->cs); |
| } |
| #elif defined HAVE_BEOS_THREADS |
| if (tok->lock->tid == find_thread(NULL)) { |
| tok->count--; |
| if (tok->count == 0) { |
| xmlMutexUnlock(tok->lock); |
| } |
| return; |
| } |
| #endif |
| } |
| |
| /** |
| * xmlGlobalInitMutexLock |
| * |
| * Makes sure that the global initialization mutex is initialized and |
| * locks it. |
| */ |
| void |
| __xmlGlobalInitMutexLock(void) |
| { |
| /* Make sure the global init lock is initialized and then lock it. */ |
| #ifdef HAVE_PTHREAD_H |
| /* The mutex is statically initialized, so we just lock it. */ |
| #ifdef XML_PTHREAD_WEAK |
| if (pthread_mutex_lock == NULL) |
| return; |
| #endif /* XML_PTHREAD_WEAK */ |
| pthread_mutex_lock(&global_init_lock); |
| #elif defined HAVE_WIN32_THREADS |
| LPCRITICAL_SECTION cs; |
| |
| /* Create a new critical section */ |
| if (global_init_lock == NULL) { |
| cs = malloc(sizeof(CRITICAL_SECTION)); |
| if (cs == NULL) { |
| xmlGenericError(xmlGenericErrorContext, |
| "xmlGlobalInitMutexLock: out of memory\n"); |
| return; |
| } |
| InitializeCriticalSection(cs); |
| |
| /* Swap it into the global_init_lock */ |
| #ifdef InterlockedCompareExchangePointer |
| InterlockedCompareExchangePointer((void **) &global_init_lock, |
| cs, NULL); |
| #else /* Use older void* version */ |
| InterlockedCompareExchange((void **) &global_init_lock, |
| (void *) cs, NULL); |
| #endif /* InterlockedCompareExchangePointer */ |
| |
| /* If another thread successfully recorded its critical |
| * section in the global_init_lock then discard the one |
| * allocated by this thread. */ |
| if (global_init_lock != cs) { |
| DeleteCriticalSection(cs); |
| free(cs); |
| } |
| } |
| |
| /* Lock the chosen critical section */ |
| EnterCriticalSection(global_init_lock); |
| #elif defined HAVE_BEOS_THREADS |
| int32 sem; |
| |
| /* Allocate a new semaphore */ |
| sem = create_sem(1, "xmlGlobalinitMutex"); |
| |
| while (global_init_lock == -1) { |
| if (atomic_add(&global_init_count, 1) == 0) { |
| global_init_lock = sem; |
| } else { |
| snooze(1); |
| atomic_add(&global_init_count, -1); |
| } |
| } |
| |
| /* If another thread successfully recorded its critical |
| * section in the global_init_lock then discard the one |
| * allocated by this thread. */ |
| if (global_init_lock != sem) |
| delete_sem(sem); |
| |
| /* Acquire the chosen semaphore */ |
| if (acquire_sem(global_init_lock) != B_NO_ERROR) { |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, |
| "xmlGlobalInitMutexLock():BeOS:Couldn't acquire semaphore\n"); |
| #endif |
| } |
| #endif |
| } |
| |
| void |
| __xmlGlobalInitMutexUnlock(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| #ifdef XML_PTHREAD_WEAK |
| if (pthread_mutex_unlock == NULL) |
| return; |
| #endif /* XML_PTHREAD_WEAK */ |
| pthread_mutex_unlock(&global_init_lock); |
| #elif defined HAVE_WIN32_THREADS |
| if (global_init_lock != NULL) { |
| LeaveCriticalSection(global_init_lock); |
| } |
| #elif defined HAVE_BEOS_THREADS |
| release_sem(global_init_lock); |
| #endif |
| } |
| |
| /** |
| * xmlGlobalInitMutexDestroy |
| * |
| * Makes sure that the global initialization mutex is destroyed before |
| * application termination. |
| */ |
| void |
| __xmlGlobalInitMutexDestroy(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| #elif defined HAVE_WIN32_THREADS |
| if (global_init_lock != NULL) { |
| DeleteCriticalSection(global_init_lock); |
| free(global_init_lock); |
| global_init_lock = NULL; |
| } |
| #endif |
| } |
| |
| /************************************************************************ |
| * * |
| * Per thread global state handling * |
| * * |
| ************************************************************************/ |
| |
| #ifdef LIBXML_THREAD_ENABLED |
| #ifdef xmlLastError |
| #undef xmlLastError |
| #endif |
| |
| /** |
| * xmlFreeGlobalState: |
| * @state: a thread global state |
| * |
| * xmlFreeGlobalState() is called when a thread terminates with a non-NULL |
| * global state. It is is used here to reclaim memory resources. |
| */ |
| static void |
| xmlFreeGlobalState(void *state) |
| { |
| xmlGlobalState *gs = (xmlGlobalState *) state; |
| |
| /* free any memory allocated in the thread's xmlLastError */ |
| xmlResetError(&(gs->xmlLastError)); |
| free(state); |
| } |
| |
| /** |
| * xmlNewGlobalState: |
| * |
| * xmlNewGlobalState() allocates a global state. This structure is used to |
| * hold all data for use by a thread when supporting backwards compatibility |
| * of libxml2 to pre-thread-safe behaviour. |
| * |
| * Returns the newly allocated xmlGlobalStatePtr or NULL in case of error |
| */ |
| static xmlGlobalStatePtr |
| xmlNewGlobalState(void) |
| { |
| xmlGlobalState *gs; |
| |
| gs = malloc(sizeof(xmlGlobalState)); |
| if (gs == NULL) { |
| xmlGenericError(xmlGenericErrorContext, |
| "xmlGetGlobalState: out of memory\n"); |
| return (NULL); |
| } |
| |
| memset(gs, 0, sizeof(xmlGlobalState)); |
| xmlInitializeGlobalState(gs); |
| return (gs); |
| } |
| #endif /* LIBXML_THREAD_ENABLED */ |
| |
| #ifdef HAVE_PTHREAD_H |
| #elif defined HAVE_WIN32_THREADS |
| #if !defined(HAVE_COMPILER_TLS) |
| #if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL) |
| typedef struct _xmlGlobalStateCleanupHelperParams { |
| HANDLE thread; |
| void *memory; |
| } xmlGlobalStateCleanupHelperParams; |
| |
| static void XMLCDECL |
| xmlGlobalStateCleanupHelper(void *p) |
| { |
| xmlGlobalStateCleanupHelperParams *params = |
| (xmlGlobalStateCleanupHelperParams *) p; |
| WaitForSingleObject(params->thread, INFINITE); |
| CloseHandle(params->thread); |
| xmlFreeGlobalState(params->memory); |
| free(params); |
| _endthread(); |
| } |
| #else /* LIBXML_STATIC && !LIBXML_STATIC_FOR_DLL */ |
| |
| typedef struct _xmlGlobalStateCleanupHelperParams { |
| void *memory; |
| struct _xmlGlobalStateCleanupHelperParams *prev; |
| struct _xmlGlobalStateCleanupHelperParams *next; |
| } xmlGlobalStateCleanupHelperParams; |
| |
| static xmlGlobalStateCleanupHelperParams *cleanup_helpers_head = NULL; |
| static CRITICAL_SECTION cleanup_helpers_cs; |
| |
| #endif /* LIBXMLSTATIC && !LIBXML_STATIC_FOR_DLL */ |
| #endif /* HAVE_COMPILER_TLS */ |
| #endif /* HAVE_WIN32_THREADS */ |
| |
| #if defined HAVE_BEOS_THREADS |
| |
| /** |
| * xmlGlobalStateCleanup: |
| * @data: unused parameter |
| * |
| * Used for Beos only |
| */ |
| void |
| xmlGlobalStateCleanup(void *data) |
| { |
| void *globalval = tls_get(globalkey); |
| |
| if (globalval != NULL) |
| xmlFreeGlobalState(globalval); |
| } |
| #endif |
| |
| /** |
| * xmlGetGlobalState: |
| * |
| * xmlGetGlobalState() is called to retrieve the global state for a thread. |
| * |
| * Returns the thread global state or NULL in case of error |
| */ |
| xmlGlobalStatePtr |
| xmlGetGlobalState(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| xmlGlobalState *globalval; |
| |
| if (libxml_is_threaded == 0) |
| return (NULL); |
| |
| pthread_once(&once_control, xmlOnceInit); |
| |
| if ((globalval = (xmlGlobalState *) |
| pthread_getspecific(globalkey)) == NULL) { |
| xmlGlobalState *tsd = xmlNewGlobalState(); |
| if (tsd == NULL) |
| return(NULL); |
| |
| pthread_setspecific(globalkey, tsd); |
| return (tsd); |
| } |
| return (globalval); |
| #elif defined HAVE_WIN32_THREADS |
| #if defined(HAVE_COMPILER_TLS) |
| if (!tlstate_inited) { |
| tlstate_inited = 1; |
| xmlInitializeGlobalState(&tlstate); |
| } |
| return &tlstate; |
| #else /* HAVE_COMPILER_TLS */ |
| xmlGlobalState *globalval; |
| xmlGlobalStateCleanupHelperParams *p; |
| |
| xmlOnceInit(); |
| #if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL) |
| globalval = (xmlGlobalState *) TlsGetValue(globalkey); |
| #else |
| p = (xmlGlobalStateCleanupHelperParams *) TlsGetValue(globalkey); |
| globalval = (xmlGlobalState *) (p ? p->memory : NULL); |
| #endif |
| if (globalval == NULL) { |
| xmlGlobalState *tsd = xmlNewGlobalState(); |
| |
| if (tsd == NULL) |
| return(NULL); |
| p = (xmlGlobalStateCleanupHelperParams *) |
| malloc(sizeof(xmlGlobalStateCleanupHelperParams)); |
| if (p == NULL) { |
| xmlGenericError(xmlGenericErrorContext, |
| "xmlGetGlobalState: out of memory\n"); |
| xmlFreeGlobalState(tsd); |
| return(NULL); |
| } |
| p->memory = tsd; |
| #if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL) |
| DuplicateHandle(GetCurrentProcess(), GetCurrentThread(), |
| GetCurrentProcess(), &p->thread, 0, TRUE, |
| DUPLICATE_SAME_ACCESS); |
| TlsSetValue(globalkey, tsd); |
| _beginthread(xmlGlobalStateCleanupHelper, 0, p); |
| #else |
| EnterCriticalSection(&cleanup_helpers_cs); |
| if (cleanup_helpers_head != NULL) { |
| cleanup_helpers_head->prev = p; |
| } |
| p->next = cleanup_helpers_head; |
| p->prev = NULL; |
| cleanup_helpers_head = p; |
| TlsSetValue(globalkey, p); |
| LeaveCriticalSection(&cleanup_helpers_cs); |
| #endif |
| |
| return (tsd); |
| } |
| return (globalval); |
| #endif /* HAVE_COMPILER_TLS */ |
| #elif defined HAVE_BEOS_THREADS |
| xmlGlobalState *globalval; |
| |
| xmlOnceInit(); |
| |
| if ((globalval = (xmlGlobalState *) tls_get(globalkey)) == NULL) { |
| xmlGlobalState *tsd = xmlNewGlobalState(); |
| if (tsd == NULL) |
| return (NULL); |
| |
| tls_set(globalkey, tsd); |
| on_exit_thread(xmlGlobalStateCleanup, NULL); |
| return (tsd); |
| } |
| return (globalval); |
| #else |
| return (NULL); |
| #endif |
| } |
| |
| /************************************************************************ |
| * * |
| * Library wide thread interfaces * |
| * * |
| ************************************************************************/ |
| |
| /** |
| * xmlGetThreadId: |
| * |
| * xmlGetThreadId() find the current thread ID number |
| * Note that this is likely to be broken on some platforms using pthreads |
| * as the specification doesn't mandate pthread_t to be an integer type |
| * |
| * Returns the current thread ID number |
| */ |
| int |
| xmlGetThreadId(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| pthread_t id; |
| int ret; |
| |
| if (libxml_is_threaded == 0) |
| return (0); |
| id = pthread_self(); |
| /* horrible but preserves compat, see warning above */ |
| memcpy(&ret, &id, sizeof(ret)); |
| return (ret); |
| #elif defined HAVE_WIN32_THREADS |
| return GetCurrentThreadId(); |
| #elif defined HAVE_BEOS_THREADS |
| return find_thread(NULL); |
| #else |
| return ((int) 0); |
| #endif |
| } |
| |
| /** |
| * xmlIsMainThread: |
| * |
| * xmlIsMainThread() check whether the current thread is the main thread. |
| * |
| * Returns 1 if the current thread is the main thread, 0 otherwise |
| */ |
| int |
| xmlIsMainThread(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded == -1) |
| xmlInitThreads(); |
| if (libxml_is_threaded == 0) |
| return (1); |
| pthread_once(&once_control, xmlOnceInit); |
| #elif defined HAVE_WIN32_THREADS |
| xmlOnceInit(); |
| #elif defined HAVE_BEOS_THREADS |
| xmlOnceInit(); |
| #endif |
| |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, "xmlIsMainThread()\n"); |
| #endif |
| #ifdef HAVE_PTHREAD_H |
| return (pthread_equal(mainthread,pthread_self())); |
| #elif defined HAVE_WIN32_THREADS |
| return (mainthread == GetCurrentThreadId()); |
| #elif defined HAVE_BEOS_THREADS |
| return (mainthread == find_thread(NULL)); |
| #else |
| return (1); |
| #endif |
| } |
| |
| /** |
| * xmlLockLibrary: |
| * |
| * xmlLockLibrary() is used to take out a re-entrant lock on the libxml2 |
| * library. |
| */ |
| void |
| xmlLockLibrary(void) |
| { |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, "xmlLockLibrary()\n"); |
| #endif |
| xmlRMutexLock(xmlLibraryLock); |
| } |
| |
| /** |
| * xmlUnlockLibrary: |
| * |
| * xmlUnlockLibrary() is used to release a re-entrant lock on the libxml2 |
| * library. |
| */ |
| void |
| xmlUnlockLibrary(void) |
| { |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, "xmlUnlockLibrary()\n"); |
| #endif |
| xmlRMutexUnlock(xmlLibraryLock); |
| } |
| |
| /** |
| * xmlInitThreads: |
| * |
| * xmlInitThreads() is used to to initialize all the thread related |
| * data of the libxml2 library. |
| */ |
| void |
| xmlInitThreads(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| #ifdef XML_PTHREAD_WEAK |
| if (libxml_is_threaded == -1) { |
| if ((pthread_once != NULL) && |
| (pthread_getspecific != NULL) && |
| (pthread_setspecific != NULL) && |
| (pthread_key_create != NULL) && |
| (pthread_key_delete != NULL) && |
| (pthread_mutex_init != NULL) && |
| (pthread_mutex_destroy != NULL) && |
| (pthread_mutex_lock != NULL) && |
| (pthread_mutex_unlock != NULL) && |
| (pthread_cond_init != NULL) && |
| (pthread_cond_destroy != NULL) && |
| (pthread_cond_wait != NULL) && |
| (pthread_equal != NULL) && |
| (pthread_self != NULL) && |
| (pthread_cond_signal != NULL)) { |
| libxml_is_threaded = 1; |
| |
| /* fprintf(stderr, "Running multithreaded\n"); */ |
| } else { |
| |
| /* fprintf(stderr, "Running without multithread\n"); */ |
| libxml_is_threaded = 0; |
| } |
| } |
| #endif /* XML_PTHREAD_WEAK */ |
| #endif |
| } |
| |
| /** |
| * xmlCleanupThreads: |
| * |
| * xmlCleanupThreads() is used to to cleanup all the thread related |
| * data of the libxml2 library once processing has ended. |
| * |
| * WARNING: if your application is multithreaded or has plugin support |
| * calling this may crash the application if another thread or |
| * a plugin is still using libxml2. It's sometimes very hard to |
| * guess if libxml2 is in use in the application, some libraries |
| * or plugins may use it without notice. In case of doubt abstain |
| * from calling this function or do it just before calling exit() |
| * to avoid leak reports from valgrind ! |
| */ |
| void |
| xmlCleanupThreads(void) |
| { |
| #ifdef DEBUG_THREADS |
| xmlGenericError(xmlGenericErrorContext, "xmlCleanupThreads()\n"); |
| #endif |
| #ifdef HAVE_PTHREAD_H |
| if (libxml_is_threaded != 0) |
| pthread_key_delete(globalkey); |
| once_control = once_control_init; |
| #elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL)) |
| if (globalkey != TLS_OUT_OF_INDEXES) { |
| xmlGlobalStateCleanupHelperParams *p; |
| |
| EnterCriticalSection(&cleanup_helpers_cs); |
| p = cleanup_helpers_head; |
| while (p != NULL) { |
| xmlGlobalStateCleanupHelperParams *temp = p; |
| |
| p = p->next; |
| xmlFreeGlobalState(temp->memory); |
| free(temp); |
| } |
| cleanup_helpers_head = 0; |
| LeaveCriticalSection(&cleanup_helpers_cs); |
| TlsFree(globalkey); |
| globalkey = TLS_OUT_OF_INDEXES; |
| } |
| DeleteCriticalSection(&cleanup_helpers_cs); |
| #endif |
| } |
| |
| #ifdef LIBXML_THREAD_ENABLED |
| |
| /** |
| * xmlOnceInit |
| * |
| * xmlOnceInit() is used to initialize the value of mainthread for use |
| * in other routines. This function should only be called using |
| * pthread_once() in association with the once_control variable to ensure |
| * that the function is only called once. See man pthread_once for more |
| * details. |
| */ |
| static void |
| xmlOnceInit(void) |
| { |
| #ifdef HAVE_PTHREAD_H |
| (void) pthread_key_create(&globalkey, xmlFreeGlobalState); |
| mainthread = pthread_self(); |
| __xmlInitializeDict(); |
| #elif defined(HAVE_WIN32_THREADS) |
| if (!run_once.done) { |
| if (InterlockedIncrement(&run_once.control) == 1) { |
| #if !defined(HAVE_COMPILER_TLS) |
| #if !defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL) |
| InitializeCriticalSection(&cleanup_helpers_cs); |
| #endif |
| globalkey = TlsAlloc(); |
| #endif |
| mainthread = GetCurrentThreadId(); |
| __xmlInitializeDict(); |
| run_once.done = 1; |
| } else { |
| /* Another thread is working; give up our slice and |
| * wait until they're done. */ |
| while (!run_once.done) |
| Sleep(0); |
| } |
| } |
| #elif defined HAVE_BEOS_THREADS |
| if (atomic_add(&run_once_init, 1) == 0) { |
| globalkey = tls_allocate(); |
| tls_set(globalkey, NULL); |
| mainthread = find_thread(NULL); |
| __xmlInitializeDict(); |
| } else |
| atomic_add(&run_once_init, -1); |
| #endif |
| } |
| #endif |
| |
| /** |
| * DllMain: |
| * @hinstDLL: handle to DLL instance |
| * @fdwReason: Reason code for entry |
| * @lpvReserved: generic pointer (depends upon reason code) |
| * |
| * Entry point for Windows library. It is being used to free thread-specific |
| * storage. |
| * |
| * Returns TRUE always |
| */ |
| #ifdef HAVE_PTHREAD_H |
| #elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL)) |
| #if defined(LIBXML_STATIC_FOR_DLL) |
| int XMLCALL |
| xmlDllMain(ATTRIBUTE_UNUSED void *hinstDLL, unsigned long fdwReason, |
| ATTRIBUTE_UNUSED void *lpvReserved) |
| #else |
| /* declare to avoid "no previous prototype for 'DllMain'" warning */ |
| /* Note that we do NOT want to include this function declaration in |
| a public header because it's meant to be called by Windows itself, |
| not a program that uses this library. This also has to be exported. */ |
| |
| XMLPUBFUN BOOL WINAPI |
| DllMain (HINSTANCE hinstDLL, |
| DWORD fdwReason, |
| LPVOID lpvReserved); |
| |
| BOOL WINAPI |
| DllMain(ATTRIBUTE_UNUSED HINSTANCE hinstDLL, DWORD fdwReason, |
| ATTRIBUTE_UNUSED LPVOID lpvReserved) |
| #endif |
| { |
| switch (fdwReason) { |
| case DLL_THREAD_DETACH: |
| if (globalkey != TLS_OUT_OF_INDEXES) { |
| xmlGlobalState *globalval = NULL; |
| xmlGlobalStateCleanupHelperParams *p = |
| (xmlGlobalStateCleanupHelperParams *) |
| TlsGetValue(globalkey); |
| globalval = (xmlGlobalState *) (p ? p->memory : NULL); |
| if (globalval) { |
| xmlFreeGlobalState(globalval); |
| TlsSetValue(globalkey, NULL); |
| } |
| if (p) { |
| EnterCriticalSection(&cleanup_helpers_cs); |
| if (p == cleanup_helpers_head) |
| cleanup_helpers_head = p->next; |
| else |
| p->prev->next = p->next; |
| if (p->next != NULL) |
| p->next->prev = p->prev; |
| LeaveCriticalSection(&cleanup_helpers_cs); |
| free(p); |
| } |
| } |
| break; |
| } |
| return TRUE; |
| } |
| #endif |
| #define bottom_threads |
| #include "elfgcchack.h" |