* Author:
* Dick Porter (dick@ximian.com)
*
- * (C) 2002 Ximian, Inc.
+ * (C) 2002-2006 Ximian, Inc.
*/
#include <config.h>
#include <stdio.h>
#include <glib.h>
#include <string.h>
+#include <mono/utils/gc_wrapper.h>
#include <pthread.h>
#include <signal.h>
#include <sched.h>
#include <mono/io-layer/wapi.h>
#include <mono/io-layer/wapi-private.h>
-#include <mono/io-layer/timed-thread.h>
#include <mono/io-layer/handles-private.h>
#include <mono/io-layer/misc-private.h>
#include <mono/io-layer/mono-mutex.h>
#include <mono/io-layer/thread-private.h>
#include <mono/io-layer/mono-spinlock.h>
#include <mono/io-layer/mutex-private.h>
+#include <mono/io-layer/atomic.h>
-#if HAVE_VALGRIND_MEMCHECK_H
+#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#undef DEBUG
#undef TLS_DEBUG
+#if 0
+#define WAIT_DEBUG(code) do { code } while (0)
+#else
+#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 mono_mutex_t thread_hash_mutex = MONO_MUTEX_INITIALIZER;
-static GHashTable *thread_hash=NULL;
+static pthread_key_t thread_hash_key;
-static gboolean thread_own (gpointer handle);
+/* 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_shared */
+ NULL, /* close */
NULL, /* signal */
- thread_own, /* own */
+ NULL, /* own */
NULL, /* is_owned */
+ NULL, /* special_wait */
+ NULL /* prewait */
};
static mono_once_t thread_ops_once=MONO_ONCE_INIT;
-#ifdef WITH_INCLUDED_LIBGC
-static void gc_init (void);
-#endif
-
static void thread_ops_init (void)
{
_wapi_handle_register_capabilities (WAPI_HANDLE_THREAD,
WAPI_HANDLE_CAP_WAIT);
+}
-#ifdef WITH_INCLUDED_LIBGC
- gc_init ();
-#endif
+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);
}
-static gboolean thread_own (gpointer handle)
+/* 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)
{
- struct _WapiHandleShared shared_handle;
struct _WapiHandle_thread *thread_handle;
gboolean ok;
+ int i;
+ pid_t pid = _wapi_getpid ();
+ pthread_t tid = pthread_self ();
#ifdef DEBUG
- g_message ("%s: owning thread handle %p", __func__, handle);
+ g_message ("%s: Thread %p abandoning held mutexes", __func__, handle);
#endif
- ok = _wapi_copy_handle (handle, WAPI_HANDLE_THREAD,
- &shared_handle);
+ 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 copying thread handle %p", __func__,
+ g_warning ("%s: error looking up thread handle %p", __func__,
handle);
- return(FALSE);
+ return;
}
- thread_handle = &shared_handle.u.thread;
-
- if (thread_handle->owner_pid != getpid()) {
-#ifdef DEBUG
- g_message ("%s: can't join thread, %d not owner process %d",
- __func__, getpid(), thread_handle->owner_pid);
-#endif
- /* FIXME: might need to return TRUE here so that other
- * processes can WaitFor thread handles
- */
- return(FALSE);
+
+ if (!pthread_equal (thread_handle->id, tid)) {
+ return;
}
- if (thread_handle->joined == FALSE) {
- _wapi_timed_thread_join (thread_handle->thread, NULL, NULL);
- thread_handle->joined = TRUE;
-
- ok = _wapi_replace_handle (handle, WAPI_HANDLE_THREAD,
- &shared_handle);
- if (ok == FALSE) {
- SetLastError (ERROR_OUTOFMEMORY);
- return (FALSE);
- }
+ 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);
}
-
- return(TRUE);
}
-static void thread_exit(guint32 exitstatus, gpointer handle)
+void _wapi_thread_set_termination_details (gpointer handle,
+ guint32 exitstatus)
{
- struct _WapiHandleShared shared_handle;
struct _WapiHandle_thread *thread_handle;
gboolean ok;
int thr_ret;
-
- pthread_cleanup_push ((void(*)(void *))_wapi_handle_unlock_handle,
- handle);
- thr_ret = _wapi_handle_lock_handle (handle);
- g_assert (thr_ret == 0);
- ok = _wapi_copy_handle (handle, WAPI_HANDLE_THREAD,
- &shared_handle);
- if (ok == FALSE) {
- g_warning ("%s: error copying thread handle %p", __func__,
- handle);
+ if (_wapi_handle_issignalled (handle) ||
+ _wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
+ /* We must have already deliberately finished with
+ * this thread, so don't do any more now
+ */
return;
}
- thread_handle = &shared_handle.u.thread;
-
- _wapi_mutex_check_abandoned (getpid (), thread_handle->thread->id);
#ifdef DEBUG
- g_message ("%s: Recording thread handle %p exit status", __func__,
- handle);
+ g_message ("%s: Thread %p terminating", __func__, handle);
#endif
-
- thread_handle->exitstatus = exitstatus;
- thread_handle->state = THREAD_STATE_EXITED;
- ok = _wapi_replace_handle (handle, WAPI_HANDLE_THREAD, &shared_handle);
+ _wapi_thread_abandon_mutexes (handle);
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread_handle);
if (ok == FALSE) {
- SetLastError (ERROR_OUTOFMEMORY);
+ g_warning ("%s: error looking up thread handle %p", __func__,
+ handle);
+
return;
}
- _wapi_shared_handle_set_signal_state (handle, 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;
+ MONO_SEM_DESTROY (&thread_handle->suspend_sem);
+ 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);
#ifdef DEBUG
g_message("%s: Recording thread handle %p id %ld status as %d",
- __func__, handle, thread_handle->thread->id, exitstatus);
+ __func__, handle, thread_handle->id, exitstatus);
#endif
+
+ /* The thread is no longer active, so unref it */
+ _wapi_handle_unref (handle);
+}
- /* Remove this thread from the hash */
- pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
- (void *)&thread_hash_mutex);
- thr_ret = mono_mutex_lock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
+void _wapi_thread_signal_self (guint32 exitstatus)
+{
+ gpointer handle;
+
+ handle = _wapi_thread_handle_from_id (pthread_self ());
+ if (handle == NULL) {
+ /* Something gone badly wrong... */
+ return;
+ }
- g_hash_table_remove (thread_hash, GUINT_TO_POINTER (thread_handle->thread->id));
+ _wapi_thread_set_termination_details (handle, exitstatus);
+}
- thr_ret = mono_mutex_unlock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
+/* 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;
+static void thread_exit (guint32 exitstatus, gpointer handle)
+{
+ _wapi_thread_set_termination_details (handle, exitstatus);
+
+ /* Call pthread_exit() to call destructors and really exit the
+ * thread
+ */
+ pthread_exit (NULL);
+}
- /* The thread is no longer active, so unref it */
- _wapi_handle_unref (handle);
+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)
{
- thread_hash = g_hash_table_new (NULL, NULL);
+ 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);
+}
+
+static void _wapi_thread_suspend (struct _WapiHandle_thread *thread)
+{
+ g_assert (pthread_equal (thread->id, pthread_self ()));
+
+ while (MONO_SEM_WAIT (&thread->suspend_sem) != 0 &&
+ errno == EINTR);
+}
+
+static void _wapi_thread_resume (struct _WapiHandle_thread *thread)
+{
+ MONO_SEM_POST (&thread->suspend_sem);
+}
+
+static void *thread_start_routine (gpointer args) G_GNUC_NORETURN;
+static void *thread_start_routine (gpointer args)
+{
+ struct _WapiHandle_thread *thread = (struct _WapiHandle_thread *)args;
+ int thr_ret;
+
+ thr_ret = pthread_detach (pthread_self ());
+ g_assert (thr_ret == 0);
+
+ thr_ret = pthread_setspecific (thread_hash_key,
+ (void *)thread->handle);
+ if (thr_ret != 0) {
+ /* This is only supposed to happen when Mono is
+ shutting down. We cannot assert on it, though,
+ because we must not depend on metadata, which is
+ where the shutdown code is.
+
+ This is a race condition which arises because
+ pthreads don't allow creation of suspended threads.
+ Once Mono is set to shut down no new thread is
+ allowed to start, even though threads may still be
+ created. We emulate suspended threads in this
+ function by calling _wapi_thread_suspend() below.
+
+ So it can happen that even though Mono is already
+ shutting down we still end up here, and at this
+ point the thread_hash_key might already be
+ destroyed. */
+ pthread_exit (NULL);
+ }
+
+ thread->id = pthread_self();
+
+#ifdef DEBUG
+ g_message ("%s: started thread id %ld", __func__, thread->id);
+#endif
+
+ if (thread->create_flags & CREATE_SUSPENDED) {
+ _wapi_thread_suspend (thread);
+ }
+
+ thread_exit (thread->start_routine (thread->start_arg),
+ thread->handle);
+
+#ifndef __GNUC__
+ /* Even though we tell gcc that this function doesn't return,
+ * other compilers won't see that.
+ */
+ return(NULL);
+#endif
}
/**
* @create: If 0, the new thread is ready to run immediately. If
* %CREATE_SUSPENDED, the new thread will be in the suspended state,
* requiring a ResumeThread() call to continue running.
- * @tid: If non-NULL, the ID of the new thread is stored here.
+ * @tid: If non-NULL, the ID of the new thread is stored here. NB
+ * this is defined as a DWORD (ie 32bit) in the MS API, but we need to
+ * cope with 64 bit IDs for s390x and amd64.
*
* Creates a new threading handle.
*
*/
gpointer CreateThread(WapiSecurityAttributes *security G_GNUC_UNUSED, guint32 stacksize,
WapiThreadStart start, gpointer param, guint32 create,
- guint32 *tid)
+ gsize *tid)
{
- struct _WapiHandleShared shared_handle;
- struct _WapiHandle_thread thread_handle = {0};
+ struct _WapiHandle_thread thread_handle = {0}, *thread_handle_p;
pthread_attr_t attr;
gpointer handle;
gboolean ok;
int ret;
int thr_ret;
+ int i, unrefs = 0;
gpointer ct_ret = NULL;
mono_once (&thread_hash_once, thread_hash_init);
}
thread_handle.state = THREAD_STATE_START;
- thread_handle.owner_pid = getpid();
+ thread_handle.owned_mutexes = g_ptr_array_new ();
+ thread_handle.create_flags = create;
+ thread_handle.start_routine = start;
+ thread_handle.start_arg = param;
+
+ 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);
/* Set a 2M stack size. This is the default on Linux, but BSD
* needs it. (The original bug report from Martin Dvorak <md@9ll.cz>
g_assert (thr_ret == 0);
/* defaults of 2Mb for 32bits and 4Mb for 64bits */
- /* temporarily changed to use 1 MB: this allows more threads to be used,
- * as well as using less virtual memory and so more is available for
- * the GC heap.
+ /* temporarily changed to use 1 MB: this allows more threads
+ * to be used, as well as using less virtual memory and so
+ * more is available for the GC heap.
*/
if (stacksize == 0){
#if HAVE_VALGRIND_MEMCHECK_H
#else
stacksize = (SIZEOF_VOID_P / 4) * 1024 * 1024;
#endif
-
}
#ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
thr_ret = pthread_attr_setstacksize(&attr, stacksize);
g_assert (thr_ret == 0);
#endif
-
- /* Lock around the thread create, so that the new thread cant
- * race us to look up the thread handle in GetCurrentThread()
- */
- pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
- (void *)&thread_hash_mutex);
- thr_ret = mono_mutex_lock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
-
- handle = _wapi_handle_new (WAPI_HANDLE_THREAD, &thread_handle);
- if (handle == _WAPI_HANDLE_INVALID) {
- g_warning ("%s: error creating thread handle", __func__);
- goto thread_hash_cleanup;
- }
- ct_ret = handle;
- ret = _wapi_timed_thread_create (&thread_handle.thread, &attr,
- create, start, thread_exit, param,
- handle);
+ MONO_SEM_INIT (&thread_handle_p->suspend_sem, 0);
+ thread_handle_p->handle = handle;
+
+ ret = pthread_create (&thread_handle_p->id, &attr,
+ thread_start_routine, (void *)thread_handle_p);
if (ret != 0) {
#ifdef DEBUG
g_message ("%s: Thread create error: %s", __func__,
strerror(ret));
#endif
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
- }
- /* Need to update the handle with the state info that
- * _wapi_timed_thread_create created, after the initial handle
- * info was copied into shared memory
- */
- ok = _wapi_copy_handle (handle, WAPI_HANDLE_THREAD, &shared_handle);
- if (ok == FALSE) {
- g_warning ("%s: error copying thread handle %p", __func__,
- handle);
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
- }
- shared_handle.u.thread.thread = thread_handle.thread;
- ok = _wapi_replace_handle (handle, WAPI_HANDLE_THREAD, &shared_handle);
- if (ok == FALSE) {
- SetLastError (ERROR_OUTOFMEMORY);
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
+ /* Two, because of the reference we took above */
+ unrefs = 2;
+
+ goto cleanup;
}
-
- /* Hold a reference while the thread is active, because we use
- * the handle to store thread exit information
- */
- _wapi_handle_ref (handle);
-
- g_hash_table_insert (thread_hash, GUINT_TO_POINTER (thread_handle.thread->id), handle);
+ ct_ret = handle;
#ifdef DEBUG
- g_message("%s: Started thread handle %p thread %p ID %ld", __func__,
- handle, thread_handle.thread, thread_handle.thread->id);
+ g_message("%s: Started thread handle %p ID %ld", __func__, handle,
+ thread_handle_p->id);
#endif
if (tid != NULL) {
#ifdef PTHREAD_POINTER_ID
- *tid = GPOINTER_TO_UINT (thread_handle.thread->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.thread->id;
+ *tid = thread_handle_p->id;
#endif
}
-thread_hash_cleanup:
- thr_ret = mono_mutex_unlock (&thread_hash_mutex);
+cleanup:
+ thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
+ /* Must not call _wapi_handle_unref() with the shared handles
+ * already locked
+ */
+ for (i = 0; i < unrefs; i++) {
+ _wapi_handle_unref (handle);
+ }
+
return(ct_ret);
}
-gpointer OpenThread (guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, guint32 tid)
+/* 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
+ * return and do a handle search in that case.
+ */
+gpointer _wapi_thread_handle_from_id (pthread_t tid)
{
- gpointer ret=NULL;
- int thr_ret;
+ gpointer ret;
+
+ if (pthread_equal (tid, pthread_self ()) &&
+ (ret = pthread_getspecific (thread_hash_key)) != NULL) {
+ /* We know the handle */
+
+#ifdef DEBUG
+ g_message ("%s: Returning %p for self thread %ld from TLS",
+ __func__, ret, tid);
+#endif
+
+ return(ret);
+ }
- mono_once(&thread_hash_once, thread_hash_init);
- mono_once (&thread_ops_once, thread_ops_init);
+#ifdef DEBUG
+ g_message ("%s: Returning NULL for unknown or non-self thread %ld",
+ __func__, tid);
+#endif
+
+
+ return(NULL);
+}
+
+static gboolean find_thread_by_id (gpointer handle, gpointer user_data)
+{
+ pthread_t tid = (pthread_t)user_data;
+ struct _WapiHandle_thread *thread_handle;
+ gboolean ok;
+ /* Ignore threads that have already exited (ie they are signalled) */
+ if (_wapi_handle_issignalled (handle) == FALSE) {
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread_handle);
+ if (ok == FALSE) {
+ /* It's possible that the handle has vanished
+ * during the _wapi_search_handle before it
+ * gets here, so don't spam the console with
+ * warnings.
+ */
+ return(FALSE);
+ }
+
#ifdef DEBUG
- g_message ("%s: looking up thread %d", __func__, tid);
+ g_message ("%s: looking at thread %ld from process %d", __func__, thread_handle->id, 0);
#endif
- pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
- (void *)&thread_hash_mutex);
- thr_ret = mono_mutex_lock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
+ if (pthread_equal (thread_handle->id, tid)) {
+#ifdef DEBUG
+ g_message ("%s: found the thread we are looking for",
+ __func__);
+#endif
+ return(TRUE);
+ }
+ }
+
+#ifdef DEBUG
+ g_message ("%s: not found %ld, returning FALSE", __func__, tid);
+#endif
- ret = g_hash_table_lookup (thread_hash, GUINT_TO_POINTER (tid));
+ return(FALSE);
+}
- thr_ret = mono_mutex_unlock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
+/* NB tid is 32bit in MS API, but we need 64bit on amd64 and s390x
+ * (and probably others)
+ */
+gpointer OpenThread (guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, gsize tid)
+{
+ gpointer ret=NULL;
+
+ mono_once (&thread_hash_once, thread_hash_init);
+ mono_once (&thread_ops_once, thread_ops_init);
- if(ret!=NULL) {
+#ifdef DEBUG
+ g_message ("%s: looking up thread %"G_GSIZE_FORMAT, __func__, tid);
+#endif
+
+ ret = _wapi_thread_handle_from_id ((pthread_t)tid);
+ 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 */
+ } else {
+ /* if _wapi_search_handle() returns a found handle, it
+ * refs it itself
+ */
_wapi_handle_ref (ret);
}
*/
void ExitThread(guint32 exitcode)
{
- _wapi_timed_thread_exit(exitcode);
+ gpointer thread = _wapi_thread_handle_from_id (pthread_self ());
+
+ if (thread != NULL) {
+ thread_exit(exitcode, thread);
+ } else {
+ /* Just blow this thread away */
+ pthread_exit (NULL);
+ }
}
/**
*/
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);
+ }
+
#ifdef DEBUG
g_message ("%s: Finding exit status for thread handle %p id %ld",
- __func__, handle,
- WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread->id);
+ __func__, handle, thread_handle->id);
#endif
if (exitcode == NULL) {
return(FALSE);
}
- if (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).state != THREAD_STATE_EXITED) {
+ if (thread_handle->state != THREAD_STATE_EXITED) {
#ifdef DEBUG
g_message ("%s: Thread still active (state %d, exited is %d)",
- __func__,
- WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).state,
+ __func__, thread_handle->state,
THREAD_STATE_EXITED);
#endif
*exitcode = STILL_ACTIVE;
return(TRUE);
}
- *exitcode = WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).exitstatus;
+ *exitcode = thread_handle->exitstatus;
return(TRUE);
}
* Looks up the thread ID of the current thread. This ID can be
* passed to OpenThread() to create a new handle on this thread.
*
- * Return value: the thread ID.
+ * Return value: the thread ID. NB this is defined as DWORD (ie 32
+ * bit) in the MS API, but we need to cope with 64 bit IDs for s390x
+ * and amd64. This doesn't really break the API, it just embraces and
+ * extends it on 64bit platforms :)
*/
-guint32 GetCurrentThreadId(void)
+gsize GetCurrentThreadId(void)
{
pthread_t tid = pthread_self();
#ifdef PTHREAD_POINTER_ID
- return(GPOINTER_TO_UINT(tid));
+ /* 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(guint32 *tid)
+static gpointer thread_attach(gsize *tid)
{
- struct _WapiHandleShared shared_handle;
- struct _WapiHandle_thread thread_handle = {0};
+ struct _WapiHandle_thread thread_handle = {0}, *thread_handle_p;
gpointer handle;
gboolean ok;
- int ret;
int thr_ret;
- gpointer ta_ret = NULL;
mono_once (&thread_hash_once, thread_hash_init);
mono_once (&thread_ops_once, thread_ops_init);
thread_handle.state = THREAD_STATE_START;
- thread_handle.owner_pid = getpid();
-
- /* Lock around the thread create, so that the new thread cant
- * race us to look up the thread handle in GetCurrentThread()
- */
- pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
- (void *)&thread_hash_mutex);
- thr_ret = mono_mutex_lock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
+ 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__);
- goto thread_hash_cleanup;
- }
- ta_ret = handle;
-
- ret = _wapi_timed_thread_attach (&thread_handle.thread, thread_exit,
- handle);
- if (ret != 0) {
-#ifdef DEBUG
- g_message ("%s: Thread attach error: %s", __func__,
- strerror(ret));
-#endif
-
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
+
+ SetLastError (ERROR_GEN_FAILURE);
+ return (NULL);
}
- /* Need to update the handle with the state info that
- * _wapi_timed_thread_create created, after the initial handle
- * info was copied into shared memory
- */
- ok = _wapi_copy_handle (handle, WAPI_HANDLE_THREAD, &shared_handle);
+ 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 copying thread handle %p", __func__,
+ g_warning ("%s: error looking up thread handle %p", __func__,
handle);
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
- }
- shared_handle.u.thread.thread = thread_handle.thread;
- ok = _wapi_replace_handle (handle, WAPI_HANDLE_THREAD, &shared_handle);
- if (ok == FALSE) {
- SetLastError (ERROR_OUTOFMEMORY);
- _wapi_handle_unref (handle);
- goto thread_hash_cleanup;
+
+ 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);
-
- g_hash_table_insert (thread_hash, GUINT_TO_POINTER (thread_handle.thread->id), handle);
+ /* suspend_sem is not used for attached threads, but
+ * thread_exit() might try to destroy it
+ */
+ MONO_SEM_INIT (&thread_handle_p->suspend_sem, 0);
+ 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);
+
#ifdef DEBUG
- g_message("%s: Attached thread handle %p thread %p ID %ld", __func__,
- handle, thread_handle.thread, thread_handle.thread->id);
+ g_message("%s: Attached thread handle %p ID %ld", __func__, handle,
+ thread_handle_p->id);
#endif
if (tid != NULL) {
#ifdef PTHREAD_POINTER_ID
- *tid = GPOINTER_TO_UINT(thread_handle.thread->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.thread->id;
+ *tid = thread_handle_p->id;
#endif
}
-thread_hash_cleanup:
- thr_ret = mono_mutex_unlock (&thread_hash_mutex);
+cleanup:
+ thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
- return(ta_ret);
+ return(handle);
+}
+
+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);
}
/**
*/
gpointer GetCurrentThread(void)
{
- gpointer ret=NULL;
- guint32 tid;
- int thr_ret;
-
mono_once(&thread_hash_once, thread_hash_init);
mono_once (&thread_ops_once, thread_ops_init);
- tid=GetCurrentThreadId();
-
- pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
- (void *)&thread_hash_mutex);
- thr_ret = mono_mutex_lock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
-
- ret = g_hash_table_lookup (thread_hash, GUINT_TO_POINTER (tid));
-
- thr_ret = mono_mutex_unlock(&thread_hash_mutex);
- g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
-
- if (!ret) {
- ret = thread_attach (NULL);
- }
-
- return(ret);
+ return(_WAPI_THREAD_CURRENT);
}
/**
*/
guint32 ResumeThread(gpointer handle)
{
- if (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread == NULL) {
- return(0xFFFFFFFF);
+ 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 (0xFFFFFFFF);
}
-#ifdef WITH_INCLUDED_LIBGC
- if (WAPI_SHARED_HANDLE_DATA(handle, thread).thread->suspend_count <= 1)
- _wapi_timed_thread_resume (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread);
-
- return (--(WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread->suspend_count));
-#else
/* This is still a kludge that only copes with starting a
* thread that was suspended on create, so don't bother with
* the suspend count crap yet
*/
- _wapi_timed_thread_resume (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread);
+ _wapi_thread_resume (thread_handle);
return(0xFFFFFFFF);
-#endif
}
/**
*/
guint32 SuspendThread(gpointer handle)
{
-#ifdef WITH_INCLUDED_LIBGC
- gpointer current;
-
- current = GetCurrentThread ();
-
- if (WAPI_SHARED_HANDLE_DATA(handle, thread).thread == NULL) {
- return(0xFFFFFFFF);
- }
-
- if (!WAPI_SHARED_HANDLE_DATA(handle, thread).thread->suspend_count) {
- if (handle == current)
- _wapi_timed_thread_suspend (WAPI_SHARED_HANDLE_DATA(handle, thread).thread);
- else {
- pthread_kill (WAPI_SHARED_HANDLE_DATA(handle, thread).thread->id, SIGPWR);
- while (MONO_SEM_WAIT (&WAPI_SHARED_HANDLE_DATA(handle, thread).thread->suspended_sem) != 0) {
- if (errno != EINTR) {
- return(0xFFFFFFFF);
- }
- }
- }
- }
-
- return (WAPI_SHARED_HANDLE_DATA(handle, thread).thread->suspend_count++);
-#else
return(0xFFFFFFFF);
-#endif
}
/*
#endif
if (alertable) {
- current_thread = GetCurrentThread ();
+ current_thread = _wapi_thread_handle_from_id (pthread_self ());
+ if (current_thread == NULL) {
+ SetLastError (ERROR_INVALID_HANDLE);
+ return(WAIT_FAILED);
+ }
+
if (_wapi_thread_apc_pending (current_thread)) {
_wapi_thread_dispatch_apc_queue (current_thread);
return WAIT_IO_COMPLETION;
SleepEx(ms, FALSE);
}
-guint32 QueueUserAPC (WapiApcProc apc_callback, gpointer handle,
- gpointer param)
-{
- _wapi_timed_thread_queue_apc (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread, apc_callback, param);
- return(1);
-}
-
gboolean _wapi_thread_cur_apc_pending (void)
{
- return(_wapi_thread_apc_pending (GetCurrentThread ()));
+ gpointer thread = _wapi_thread_handle_from_id (pthread_self ());
+
+ if (thread == NULL) {
+ SetLastError (ERROR_INVALID_HANDLE);
+ return(FALSE);
+ }
+
+ return(_wapi_thread_apc_pending (thread));
}
gboolean _wapi_thread_apc_pending (gpointer handle)
{
- return(_wapi_timed_thread_apc_pending (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread));
+ struct _WapiHandle_thread *thread;
+ gboolean ok;
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ if (ok == FALSE) {
+#ifdef DEBUG
+ /* This might happen at process shutdown, as all
+ * thread handles are forcibly closed. If a thread
+ * still has an alertable wait the final
+ * _wapi_thread_apc_pending check will probably fail
+ * to find the handle
+ */
+ g_warning ("%s: error looking up thread handle %p", __func__,
+ handle);
+#endif
+ return (FALSE);
+ }
+
+ return(thread->has_apc || thread->wait_handle == INTERRUPTION_REQUESTED_HANDLE);
}
gboolean _wapi_thread_dispatch_apc_queue (gpointer handle)
{
- _wapi_timed_thread_dispatch_apc_queue (WAPI_SHARED_HANDLE_TYPED_DATA(handle, thread).thread);
+ /* We don't support calling APC functions */
+ struct _WapiHandle_thread *thread;
+ gboolean ok;
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ g_assert (ok);
+
+ thread->has_apc = FALSE;
+
+ return(TRUE);
+}
+
+/*
+ * 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
+ * the signal, the wait will be broken after the signal handler returns.
+ * In this case, this function is async-signal-safe.
+ */
+guint32 QueueUserAPC (WapiApcProc apc_callback, gpointer handle,
+ gpointer param)
+{
+ 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 (0);
+ }
+
+ g_assert (thread_handle->id == GetCurrentThreadId ());
+ /* No locking/memory barriers are needed here */
+ thread_handle->has_apc = TRUE;
return(1);
}
+/*
+ * wapi_interrupt_thread:
+ *
+ * This is not part of the WIN32 API.
+ * The state of the thread handle HANDLE is set to 'interrupted' which means that
+ * if the thread calls one of the WaitFor functions, the function will return with
+ * WAIT_IO_COMPLETION instead of waiting. Also, if the thread was waiting when
+ * this function was called, the wait will be broken.
+ * It is possible that the wait functions return WAIT_IO_COMPLETION, but the
+ * target thread didn't receive the interrupt signal yet, in this case it should
+ * call the wait function again. This essentially means that the target thread will
+ * busy wait until it is ready to process the interruption.
+ * FIXME: get rid of QueueUserAPC and thread->has_apc, SleepEx seems to require it.
+ */
+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);
+
+ 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_handle->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);
+}
+
+/*
+ * wapi_clear_interruption:
+ *
+ * This is not part of the WIN32 API.
+ * Clear the 'interrupted' state of the calling thread.
+ */
+void wapi_clear_interruption (void)
+{
+ struct _WapiHandle_thread *thread;
+ gboolean ok;
+ gpointer prev_handle;
+ gpointer thread_handle;
+
+ thread_handle = OpenThread (0, 0, GetCurrentThreadId ());
+ ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ g_assert (ok);
+ prev_handle = InterlockedCompareExchangePointer (&thread->wait_handle,
+ NULL, INTERRUPTION_REQUESTED_HANDLE);
+ if (prev_handle == INTERRUPTION_REQUESTED_HANDLE)
+ WAIT_DEBUG (printf ("%p: state -> NORMAL.\n", GetCurrentThreadId ()););
-#ifdef WITH_INCLUDED_LIBGC
+ _wapi_handle_unref (thread_handle);
+}
-static void GC_suspend_handler (int sig)
+char* wapi_current_thread_desc ()
{
+ struct _WapiHandle_thread *thread;
+ int i;
+ gboolean ok;
gpointer handle;
+ gpointer thread_handle;
+ GString* text;
+ char *res;
+
+ thread_handle = OpenThread (0, 0, GetCurrentThreadId ());
+ ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ if (!ok)
+ return g_strdup_printf ("thread handle %p state : lookup failure", thread_handle);
+
+ handle = thread->wait_handle;
+ text = g_string_new (0);
+ g_string_append_printf (text, "thread handle %p state : ", thread_handle);
+
+ if (!handle)
+ g_string_append_printf (text, "not waiting");
+ else if (handle == INTERRUPTION_REQUESTED_HANDLE)
+ g_string_append_printf (text, "interrupted state");
+ else
+ g_string_append_printf (text, "waiting on %p : %s ", handle, _wapi_handle_typename[_wapi_handle_type (handle)]);
+ g_string_append_printf (text, " owns (");
+ for (i = 0; i < thread->owned_mutexes->len; i++) {
+ gpointer mutex = g_ptr_array_index (thread->owned_mutexes, i);
+ if (i > 0)
+ g_string_append_printf (text, ", %p", mutex);
+ else
+ g_string_append_printf (text, "%p", mutex);
+ }
+ g_string_append_printf (text, ")");
- handle = GetCurrentThread ();
-
- WAPI_SHARED_HANDLE_DATA(handle, thread).thread->stack_ptr = &ok;
- MONO_SEM_POST (&WAPI_SHARED_HANDLE_DATA(handle, thread).thread->suspended_sem);
+ res = text->str;
+ g_string_free (text, FALSE);
+ return res;
+}
- _wapi_timed_thread_suspend (WAPI_SHARED_HANDLE_DATA(handle, thread).thread);
+/**
+ * wapi_thread_set_wait_handle:
+ *
+ * Set the wait handle for the current thread to HANDLE. Return TRUE on success, FALSE
+ * if the thread is in interrupted state, and cannot start waiting.
+ */
+gboolean wapi_thread_set_wait_handle (gpointer handle)
+{
+ struct _WapiHandle_thread *thread;
+ gboolean ok;
+ gpointer prev_handle;
+ gpointer thread_handle;
+
+ thread_handle = OpenThread (0, 0, GetCurrentThreadId ());
+ ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ g_assert (ok);
+
+ prev_handle = InterlockedCompareExchangePointer (&thread->wait_handle,
+ handle, NULL);
+ _wapi_handle_unref (thread_handle);
+
+ if (prev_handle == NULL) {
+ /* thread->wait_handle acts as an additional reference to the handle */
+ _wapi_handle_ref (handle);
+
+ WAIT_DEBUG (printf ("%p: state -> WAITING.\n", GetCurrentThreadId ()););
+ } else {
+ g_assert (prev_handle == INTERRUPTION_REQUESTED_HANDLE);
+ WAIT_DEBUG (printf ("%p: unable to set state to WAITING.\n", GetCurrentThreadId ()););
+ }
- WAPI_SHARED_HANDLE_DATA(handle, thread).thread->stack_ptr = NULL;
+ return prev_handle == NULL;
}
-static void gc_init (void)
+/**
+ * wapi_thread_clear_wait_handle:
+ *
+ * Clear the wait handle of the current thread.
+ */
+void wapi_thread_clear_wait_handle (gpointer handle)
{
- struct sigaction act;
+ struct _WapiHandle_thread *thread;
+ gboolean ok;
+ gpointer prev_handle;
+ gpointer thread_handle;
+
+ thread_handle = OpenThread (0, 0, GetCurrentThreadId ());
+ ok = _wapi_lookup_handle (thread_handle, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread);
+ g_assert (ok);
+
+ prev_handle = InterlockedCompareExchangePointer (&thread->wait_handle,
+ NULL, handle);
+
+ if (prev_handle == handle) {
+ _wapi_handle_unref (handle);
+ WAIT_DEBUG (printf ("%p: state -> NORMAL.\n", GetCurrentThreadId ()););
+ } else {
+ g_assert (prev_handle == INTERRUPTION_REQUESTED_HANDLE);
+ WAIT_DEBUG (printf ("%p: finished waiting.\n", GetCurrentThreadId ()););
+ }
- act.sa_handler = GC_suspend_handler;
- g_assert (sigaction (SIGPWR, &act, NULL) == 0);
+ _wapi_handle_unref (thread_handle);
}
-void mono_wapi_push_thread_stack (gpointer handle, gpointer stack_ptr)
+void _wapi_thread_own_mutex (gpointer mutex)
{
- GC_push_all_stack (WAPI_SHARED_HANDLE_DATA(handle, thread).thread->stack_ptr, stack_ptr);
+ struct _WapiHandle_thread *thread_handle;
+ gboolean ok;
+ gpointer thread;
+
+ thread = _wapi_thread_handle_from_id (pthread_self ());
+ if (thread == NULL) {
+ g_warning ("%s: error looking up thread by ID", __func__);
+ return;
+ }
+
+ ok = _wapi_lookup_handle (thread, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread_handle);
+ if (ok == FALSE) {
+ g_warning ("%s: error looking up thread handle %p", __func__,
+ thread);
+ return;
+ }
+
+ _wapi_handle_ref (mutex);
+
+ g_ptr_array_add (thread_handle->owned_mutexes, mutex);
}
-#endif /* WITH_INCLUDED_LIBGC */
+void _wapi_thread_disown_mutex (gpointer mutex)
+{
+ struct _WapiHandle_thread *thread_handle;
+ gboolean ok;
+ gpointer thread;
+
+ thread = _wapi_thread_handle_from_id (pthread_self ());
+ if (thread == NULL) {
+ g_warning ("%s: error looking up thread by ID", __func__);
+ return;
+ }
+
+ ok = _wapi_lookup_handle (thread, WAPI_HANDLE_THREAD,
+ (gpointer *)&thread_handle);
+ if (ok == FALSE) {
+ g_warning ("%s: error looking up thread handle %p", __func__,
+ thread);
+ return;
+ }
+
+ _wapi_handle_unref (mutex);
+
+ g_ptr_array_remove (thread_handle->owned_mutexes, mutex);
+}
projects / mono.git / blobdiff