#include <mono/io-layer/mutex-private.h>
#include <mono/utils/mono-threads.h>
-#include <mono/utils/gc_wrapper.h>
#include <mono/utils/atomic.h>
#include <mono/utils/mono-mutex.h>
#define WAIT_DEBUG(code) do { } while (0)
#endif
-/* Hash threads with tids. I thought of using TLS for this, but that
- * would have to set the data in the new thread, which is more hassle
- */
-static mono_once_t thread_hash_once = MONO_ONCE_INIT;
-static pthread_key_t thread_hash_key;
-
-/* This key is used with attached threads and a destructor to signal
- * when attached threads exit, as they don't have the thread_exit()
- * infrastructure
- */
-static pthread_key_t thread_attached_key;
-
struct _WapiHandleOps _wapi_thread_ops = {
NULL, /* close */
NULL, /* signal */
void _wapi_thread_cleanup (void)
{
- int ret;
-
- ret = pthread_key_delete (thread_hash_key);
- g_assert (ret == 0);
-
- ret = pthread_key_delete (thread_attached_key);
- g_assert (ret == 0);
}
-/* Called by thread_exit(), but maybe indirectly by
- * mono_thread_manage() via mono_thread_signal_self() too
- */
-static void _wapi_thread_abandon_mutexes (gpointer handle)
+static gpointer
+get_current_thread_handle (void)
{
- struct _WapiHandle_thread *thread_handle;
- gboolean ok;
- int i;
- pid_t pid = _wapi_getpid ();
- pthread_t tid = pthread_self ();
-
- DEBUG ("%s: Thread %p abandoning held mutexes", __func__, handle);
+ MonoThreadInfo *info;
- if (handle == NULL) {
- handle = _wapi_thread_handle_from_id (pthread_self ());
- if (handle == NULL) {
- /* Something gone badly wrong... */
- return;
- }
- }
-
- ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
- (gpointer *)&thread_handle);
- if (ok == FALSE) {
- g_warning ("%s: error looking up thread handle %p", __func__,
- handle);
- return;
- }
-
- if (!pthread_equal (thread_handle->id, tid)) {
- return;
- }
-
- for (i = 0; i < thread_handle->owned_mutexes->len; i++) {
- gpointer mutex = g_ptr_array_index (thread_handle->owned_mutexes, i);
-
- _wapi_mutex_abandon (mutex, pid, tid);
- _wapi_thread_disown_mutex (mutex);
- }
+ info = mono_thread_info_current ();
+ g_assert (info);
+ return info->handle;
}
-void _wapi_thread_set_termination_details (gpointer handle,
+static void
+_wapi_thread_set_termination_details (gpointer handle,
guint32 exitstatus)
{
struct _WapiHandle_thread *thread_handle;
gboolean ok;
- int thr_ret;
+ int i, thr_ret;
+ pid_t pid = _wapi_getpid ();
+ pthread_t tid = pthread_self ();
if (_wapi_handle_issignalled (handle) ||
_wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
DEBUG ("%s: Thread %p terminating", __func__, handle);
- _wapi_thread_abandon_mutexes (handle);
-
ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
(gpointer *)&thread_handle);
- if (ok == FALSE) {
- g_warning ("%s: error looking up thread handle %p", __func__,
- handle);
+ g_assert (ok);
- return;
+ DEBUG ("%s: Thread %p abandoning held mutexes", __func__, handle);
+
+ for (i = 0; i < thread_handle->owned_mutexes->len; i++) {
+ gpointer mutex = g_ptr_array_index (thread_handle->owned_mutexes, i);
+
+ _wapi_mutex_abandon (mutex, pid, tid);
+ _wapi_thread_disown_mutex (mutex);
}
+ g_ptr_array_free (thread_handle->owned_mutexes, TRUE);
- pthread_cleanup_push ((void(*)(void *))_wapi_handle_unlock_handle,
- handle);
thr_ret = _wapi_handle_lock_handle (handle);
g_assert (thr_ret == 0);
-
- thread_handle->exitstatus = exitstatus;
- thread_handle->state = THREAD_STATE_EXITED;
- g_ptr_array_free (thread_handle->owned_mutexes, TRUE);
_wapi_handle_set_signal_state (handle, TRUE, TRUE);
thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
DEBUG("%s: Recording thread handle %p id %ld status as %d",
__func__, handle, thread_handle->id, exitstatus);
{
gpointer handle;
- handle = _wapi_thread_handle_from_id (pthread_self ());
- if (handle == NULL) {
- /* Something gone badly wrong... */
+ handle = get_current_thread_handle ();
+ if (handle == NULL)
return;
- }
_wapi_thread_set_termination_details (handle, exitstatus);
}
-/* Called by the thread creation code as a thread is finishing up, and
- * by ExitThread()
-*/
-static void thread_exit (guint32 exitstatus, gpointer handle) G_GNUC_NORETURN;
-#if defined(__native_client__)
-void nacl_shutdown_gc_thread(void);
-#endif
-static void thread_exit (guint32 exitstatus, gpointer handle)
-{
-#if defined(__native_client__)
- nacl_shutdown_gc_thread();
-#endif
- _wapi_thread_set_termination_details (handle, exitstatus);
-
- /* Call pthread_exit() to call destructors and really exit the
- * thread
- */
- mono_gc_pthread_exit (NULL);
-}
-
void
-wapi_thread_set_exit_code (guint32 exitstatus, gpointer handle)
+wapi_thread_handle_set_exited (gpointer handle, guint32 exitstatus)
{
_wapi_thread_set_termination_details (handle, exitstatus);
}
-static void thread_attached_exit (gpointer handle)
-{
- /* Drop the extra reference we take in thread_attach, now this
- * thread is dead
- */
-
- _wapi_thread_set_termination_details (handle, 0);
-}
-
-static void thread_hash_init(void)
-{
- int thr_ret;
-
- thr_ret = pthread_key_create (&thread_hash_key, NULL);
- g_assert (thr_ret == 0);
-
- thr_ret = pthread_key_create (&thread_attached_key,
- thread_attached_exit);
- g_assert (thr_ret == 0);
-}
-
/*
* wapi_create_thread_handle:
*
gpointer handle;
int res;
- mono_once (&thread_hash_once, thread_hash_init);
mono_once (&thread_ops_once, thread_ops_init);
- thread_handle.state = THREAD_STATE_START;
thread_handle.owned_mutexes = g_ptr_array_new ();
handle = _wapi_handle_new (WAPI_HANDLE_THREAD, &thread_handle);
(gpointer *)&thread);
g_assert (res);
- thread->handle = handle;
-
- res = pthread_setspecific (thread_hash_key, handle);
- if (res)
- mono_gc_pthread_exit (NULL);
-
thread->id = pthread_self ();
/*
return handle;
}
+void
+wapi_ref_thread_handle (gpointer handle)
+{
+ _wapi_handle_ref (handle);
+}
+
/* The only time this function is called when tid != pthread_self ()
* is from OpenThread (), so we can fast-path most cases by just
* looking up the handle in TLS. OpenThread () must cope with a NULL
*/
gpointer _wapi_thread_handle_from_id (pthread_t tid)
{
- gpointer ret;
-
- if (pthread_equal (tid, pthread_self ()) &&
- (ret = pthread_getspecific (thread_hash_key)) != NULL) {
- /* We know the handle */
-
- DEBUG ("%s: Returning %p for self thread %ld from TLS",
- __func__, ret, tid);
-
- return(ret);
- }
-
- DEBUG ("%s: Returning NULL for unknown or non-self thread %ld",
- __func__, tid);
-
-
- return(NULL);
+ if (pthread_equal (tid, pthread_self ()))
+ return get_current_thread_handle ();
+ else
+ return NULL;
}
static gboolean find_thread_by_id (gpointer handle, gpointer user_data)
{
gpointer ret=NULL;
- mono_once (&thread_hash_once, thread_hash_init);
mono_once (&thread_ops_once, thread_ops_init);
DEBUG ("%s: looking up thread %"G_GSIZE_FORMAT, __func__, tid);
- ret = _wapi_thread_handle_from_id ((pthread_t)tid);
+ if (pthread_equal ((pthread_t)tid, pthread_self ()))
+ ret = get_current_thread_handle ();
if (ret == NULL) {
/* We need to search for this thread */
ret = _wapi_search_handle (WAPI_HANDLE_THREAD, find_thread_by_id, (gpointer)tid, NULL, FALSE/*TRUE*/); /* FIXME: have a proper look at this, me might not need to set search_shared = TRUE */
return(ret);
}
-/**
- * ExitThread:
- * @exitcode: Sets the thread's exit code, which can be read from
- * another thread with GetExitCodeThread().
- *
- * Terminates the calling thread. A thread can also exit by returning
- * from its start function. When the last thread in a process
- * terminates, the process itself terminates.
- */
-void ExitThread(guint32 exitcode)
-{
- gpointer thread = _wapi_thread_handle_from_id (pthread_self ());
-
- if (thread != NULL) {
- thread_exit(exitcode, thread);
- } else {
- /* Just blow this thread away */
- mono_gc_pthread_exit (NULL);
- }
-}
-
-/**
- * GetExitCodeThread:
- * @handle: The thread handle to query
- * @exitcode: The thread @handle exit code is stored here
- *
- * Finds the exit code of @handle, and stores it in @exitcode. If the
- * thread @handle is still running, the value stored is %STILL_ACTIVE.
- *
- * Return value: %TRUE, or %FALSE on error.
- */
-gboolean GetExitCodeThread(gpointer handle, guint32 *exitcode)
-{
- struct _WapiHandle_thread *thread_handle;
- gboolean ok;
-
- ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
- (gpointer *)&thread_handle);
- if (ok == FALSE) {
- g_warning ("%s: error looking up thread handle %p", __func__,
- handle);
- return (FALSE);
- }
-
- DEBUG ("%s: Finding exit status for thread handle %p id %ld",
- __func__, handle, thread_handle->id);
-
- if (exitcode == NULL) {
- DEBUG ("%s: Nowhere to store exit code", __func__);
- return(FALSE);
- }
-
- if (thread_handle->state != THREAD_STATE_EXITED) {
- DEBUG ("%s: Thread still active (state %d, exited is %d)",
- __func__, thread_handle->state,
- THREAD_STATE_EXITED);
- *exitcode = STILL_ACTIVE;
- return(TRUE);
- }
-
- *exitcode = thread_handle->exitstatus;
-
- return(TRUE);
-}
-
/**
* GetCurrentThreadId:
*
*/
gsize GetCurrentThreadId(void)
{
- pthread_t tid = pthread_self();
-
-#ifdef PTHREAD_POINTER_ID
- /* Don't use GPOINTER_TO_UINT here, it can't cope with
- * sizeof(void *) > sizeof(uint) when a cast to uint would
- * overflow
- */
- return((gsize)tid);
-#else
- return(tid);
-#endif
-}
-
-static gpointer thread_attach(gsize *tid)
-{
- struct _WapiHandle_thread thread_handle = {0}, *thread_handle_p;
- gpointer handle;
- gboolean ok;
- int thr_ret;
-
- mono_once (&thread_hash_once, thread_hash_init);
- mono_once (&thread_ops_once, thread_ops_init);
+ MonoNativeThreadId id;
- thread_handle.state = THREAD_STATE_START;
- thread_handle.owned_mutexes = g_ptr_array_new ();
-
- handle = _wapi_handle_new (WAPI_HANDLE_THREAD, &thread_handle);
- if (handle == _WAPI_HANDLE_INVALID) {
- g_warning ("%s: error creating thread handle", __func__);
-
- SetLastError (ERROR_GEN_FAILURE);
- return (NULL);
- }
-
- pthread_cleanup_push ((void(*)(void *))_wapi_handle_unlock_handle,
- handle);
- thr_ret = _wapi_handle_lock_handle (handle);
- g_assert (thr_ret == 0);
-
- ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
- (gpointer *)&thread_handle_p);
- if (ok == FALSE) {
- g_warning ("%s: error looking up thread handle %p", __func__,
- handle);
-
- SetLastError (ERROR_GEN_FAILURE);
- goto cleanup;
- }
-
- /* Hold a reference while the thread is active, because we use
- * the handle to store thread exit information
- */
- _wapi_handle_ref (handle);
-
- thread_handle_p->handle = handle;
- thread_handle_p->id = pthread_self ();
-
- thr_ret = pthread_setspecific (thread_hash_key, (void *)handle);
- g_assert (thr_ret == 0);
-
- thr_ret = pthread_setspecific (thread_attached_key, (void *)handle);
- g_assert (thr_ret == 0);
-
- DEBUG("%s: Attached thread handle %p ID %ld", __func__, handle,
- thread_handle_p->id);
-
- if (tid != NULL) {
-#ifdef PTHREAD_POINTER_ID
- /* Don't use GPOINTER_TO_UINT here, it can't cope with
- * sizeof(void *) > sizeof(uint) when a cast to uint
- * would overflow
- */
- *tid = (gsize)(thread_handle_p->id);
-#else
- *tid = thread_handle_p->id;
-#endif
- }
-
-cleanup:
- thr_ret = _wapi_handle_unlock_handle (handle);
- g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
-
- return(handle);
+ id = mono_native_thread_id_get ();
+ return MONO_NATIVE_THREAD_ID_TO_UINT (id);
}
gpointer _wapi_thread_duplicate ()
{
- gpointer ret = NULL;
-
- mono_once (&thread_hash_once, thread_hash_init);
- mono_once (&thread_ops_once, thread_ops_init);
-
- ret = _wapi_thread_handle_from_id (pthread_self ());
- if (!ret) {
- ret = thread_attach (NULL);
- } else {
- _wapi_handle_ref (ret);
- }
-
- return(ret);
-}
-
-/**
- * GetCurrentThread:
- *
- * Looks up the handle associated with the current thread. Under
- * Windows this is a pseudohandle, and must be duplicated with
- * DuplicateHandle() for some operations.
- *
- * Return value: The current thread handle, or %NULL on failure.
- * (Unknown whether Windows has a possible failure here. It may be
- * necessary to implement the pseudohandle-constant behaviour).
- */
-gpointer GetCurrentThread(void)
-{
- mono_once(&thread_hash_once, thread_hash_init);
- mono_once (&thread_ops_once, thread_ops_init);
-
- return(_WAPI_THREAD_CURRENT);
+ g_assert_not_reached ();
+ return NULL;
}
/**
DEBUG("%s: Sleeping for %d ms", __func__, ms);
if (alertable) {
- current_thread = _wapi_thread_handle_from_id (pthread_self ());
+ current_thread = get_current_thread_handle ();
if (current_thread == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
gboolean _wapi_thread_cur_apc_pending (void)
{
- gpointer thread = _wapi_thread_handle_from_id (pthread_self ());
+ gpointer thread = get_current_thread_handle ();
if (thread == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
}
/*
- * In this implementation, APC_CALLBACK is ignored.
- * if HANDLE refers to the current thread, the only effect this function has
- * that if called from a signal handler, and the thread was waiting when receiving
+ * wapi_interrupt_self:
+ *
+ * If this function called from a signal handler, and the thread was waiting when receiving
* the signal, the wait will be broken after the signal handler returns.
- * In this case, this function is async-signal-safe.
+ * This function is async-signal-safe.
*/
-guint32 QueueUserAPC (WapiApcProc apc_callback, gpointer handle,
- gpointer param)
+void
+wapi_thread_interrupt_self (void)
{
+ HANDLE handle;
struct _WapiHandle_thread *thread_handle;
gboolean ok;
+ handle = get_current_thread_handle ();
+ g_assert (handle);
+
ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
(gpointer *)&thread_handle);
if (ok == FALSE) {
g_warning ("%s: error looking up thread handle %p", __func__,
handle);
- return (0);
+ return;
}
- g_assert (thread_handle->id == (pthread_t)GetCurrentThreadId ());
/* No locking/memory barriers are needed here */
thread_handle->has_apc = TRUE;
- return(1);
}
/*
*/
void wapi_interrupt_thread (gpointer thread_handle)
{
- struct _WapiHandle_thread *thread;
- gboolean ok;
- gpointer prev_handle, wait_handle;
- guint32 idx;
- pthread_cond_t *cond;
- mono_mutex_t *mutex;
-
- ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
- (gpointer *)&thread);
- g_assert (ok);
+ gpointer wait_handle;
- while (TRUE) {
- wait_handle = thread->wait_handle;
-
- /*
- * Atomically obtain the handle the thread is waiting on, and
- * change it to a flag value.
- */
- prev_handle = InterlockedCompareExchangePointer (&thread->wait_handle,
- INTERRUPTION_REQUESTED_HANDLE, wait_handle);
- if (prev_handle == INTERRUPTION_REQUESTED_HANDLE)
- /* Already interrupted */
- return;
- if (prev_handle == wait_handle)
- break;
-
- /* Try again */
- }
-
- WAIT_DEBUG (printf ("%p: state -> INTERRUPTED.\n", thread->id););
-
- if (!wait_handle)
- /* Not waiting */
- return;
-
- /* If we reach here, then wait_handle is set to the flag value,
- * which means that the target thread is either
- * - before the first CAS in timedwait, which means it won't enter the
- * wait.
- * - it is after the first CAS, so it is already waiting, or it will
- * enter the wait, and it will be interrupted by the broadcast.
- */
- idx = GPOINTER_TO_UINT(wait_handle);
- cond = &_WAPI_PRIVATE_HANDLES(idx).signal_cond;
- mutex = &_WAPI_PRIVATE_HANDLES(idx).signal_mutex;
-
- mono_mutex_lock (mutex);
- mono_cond_broadcast (cond);
- mono_mutex_unlock (mutex);
-
- /* ref added by set_wait_handle */
- _wapi_handle_unref (wait_handle);
+ wait_handle = wapi_prepare_interrupt_thread (thread_handle);
+ wapi_finish_interrupt_thread (wait_handle);
}
-
gpointer wapi_prepare_interrupt_thread (gpointer thread_handle)
{
struct _WapiHandle_thread *thread;
_wapi_handle_unref (wait_handle);
}
-
/*
* wapi_self_interrupt:
*
*/
void wapi_self_interrupt (void)
{
- struct _WapiHandle_thread *thread;
- gboolean ok;
- gpointer prev_handle, wait_handle;
+ gpointer wait_handle;
gpointer thread_handle;
-
thread_handle = OpenThread (0, 0, GetCurrentThreadId ());
- ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
- (gpointer *)&thread);
- g_assert (ok);
-
- while (TRUE) {
- wait_handle = thread->wait_handle;
-
- /*
- * Atomically obtain the handle the thread is waiting on, and
- * change it to a flag value.
- */
- prev_handle = InterlockedCompareExchangePointer (&thread->wait_handle,
- INTERRUPTION_REQUESTED_HANDLE, wait_handle);
- if (prev_handle == INTERRUPTION_REQUESTED_HANDLE)
- /* Already interrupted */
- goto cleanup;
- /*We did not get interrupted*/
- if (prev_handle == wait_handle)
- break;
-
- /* Try again */
- }
-
- if (wait_handle) {
+ wait_handle = wapi_prepare_interrupt_thread (thread_handle);
+ if (wait_handle)
/* ref added by set_wait_handle */
_wapi_handle_unref (wait_handle);
- }
-cleanup:
_wapi_handle_unref (thread_handle);
}
gboolean ok;
gpointer thread;
- thread = _wapi_thread_handle_from_id (pthread_self ());
+ thread = get_current_thread_handle ();
if (thread == NULL) {
g_warning ("%s: error looking up thread by ID", __func__);
return;
gboolean ok;
gpointer thread;
- thread = _wapi_thread_handle_from_id (pthread_self ());
+ thread = get_current_thread_handle ();
if (thread == NULL) {
g_warning ("%s: error looking up thread by ID", __func__);
return;
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