-/*
- * mono-threads.c: Low-level threading
+/**
+ * \file
+ * Low-level threading
*
* Author:
* Rodrigo Kumpera (kumpera@gmail.com)
#include <mono/utils/mono-threads-coop.h>
#include <mono/utils/mono-threads-debug.h>
#include <mono/utils/os-event.h>
-
-#include <mono/io-layer/io-layer.h>
+#include <mono/utils/w32api.h>
#include <errno.h>
static MonoThreadInfoRuntimeCallbacks runtime_callbacks;
static MonoNativeTlsKey thread_info_key, thread_exited_key;
#ifdef HAVE_KW_THREAD
-static __thread guint32 tls_small_id MONO_TLS_FAST;
+static __thread gint32 tls_small_id = -1;
#else
static MonoNativeTlsKey small_id_key;
#endif
static MonoSemType suspend_semaphore;
static size_t pending_suspends;
+static mono_mutex_t join_mutex;
+
#define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & THREAD_STATE_MASK)
/*warn at 50 ms*/
g_free (info);
}
+/*
+ * mono_thread_info_register_small_id
+ *
+ * Registers a small ID for the current thread. This is a 16-bit value uniquely
+ * identifying the current thread. If the current thread already has a small ID
+ * assigned, that small ID will be returned; otherwise, the newly assigned small
+ * ID is returned.
+ */
int
mono_thread_info_register_small_id (void)
{
- int small_id = mono_thread_small_id_alloc ();
+ int small_id = mono_thread_info_get_small_id ();
+
+ if (small_id != -1)
+ return small_id;
+
+ small_id = mono_thread_small_id_alloc ();
#ifdef HAVE_KW_THREAD
tls_small_id = small_id;
#else
g_free (thread_handle);
}
-static void*
-register_thread (MonoThreadInfo *info, gpointer baseptr)
+static gboolean
+register_thread (MonoThreadInfo *info)
{
size_t stsize = 0;
guint8 *staddr = NULL;
- int small_id = mono_thread_info_register_small_id ();
gboolean result;
+
+ info->small_id = mono_thread_info_register_small_id ();
mono_thread_info_set_tid (info, mono_native_thread_id_get ());
- info->small_id = small_id;
info->handle = g_new0 (MonoThreadHandle, 1);
mono_refcount_init (info->handle, thread_handle_destroy);
/*set TLS early so SMR works */
mono_native_tls_set_value (thread_info_key, info);
- THREADS_DEBUG ("registering info %p tid %p small id %x\n", info, mono_thread_info_get_tid (info), info->small_id);
-
- if (threads_callbacks.thread_register) {
- if (threads_callbacks.thread_register (info, baseptr) == NULL) {
- // g_warning ("thread registation failed\n");
- mono_native_tls_set_value (thread_info_key, NULL);
- g_free (info);
- return NULL;
- }
- }
-
mono_thread_info_get_stack_bounds (&staddr, &stsize);
g_assert (staddr);
g_assert (stsize);
info->stackdata = g_byte_array_new ();
+ info->internal_thread_gchandle = G_MAXUINT32;
+
+ info->profiler_signal_ack = 1;
+
mono_threads_suspend_register (info);
+ THREADS_DEBUG ("registering info %p tid %p small id %x\n", info, mono_thread_info_get_tid (info), info->small_id);
+
+ if (threads_callbacks.thread_attach) {
+ if (!threads_callbacks.thread_attach (info)) {
+ // g_warning ("thread registation failed\n");
+ mono_native_tls_set_value (thread_info_key, NULL);
+ return FALSE;
+ }
+ }
+
/*
Transition it before taking any locks or publishing itself to reduce the chance
of others witnessing a detached thread.
result = mono_thread_info_insert (info);
g_assert (result);
mono_thread_info_suspend_unlock ();
- return info;
+
+ return TRUE;
}
static void
g_assert (mono_thread_info_is_current (info));
g_assert (mono_thread_info_is_live (info));
+ /* Pump the HP queue while the thread is alive.*/
+ mono_thread_hazardous_try_free_some ();
+
small_id = info->small_id;
/* We only enter the GC unsafe region, as when exiting this function, the thread
be done while holding the suspend lock to give no other thread chance
to suspend it.
*/
- if (threads_callbacks.thread_unregister)
- threads_callbacks.thread_unregister (info);
+ if (threads_callbacks.thread_detach_with_lock)
+ threads_callbacks.thread_detach_with_lock (info);
/* The thread is no longer active, so unref its handle */
mono_threads_close_thread_handle (info->handle);
/*now it's safe to free the thread info.*/
mono_thread_hazardous_try_free (info, free_thread_info);
- /* Pump the HP queue */
- mono_thread_hazardous_try_free_some ();
mono_thread_small_id_free (small_id);
mono_threads_signal_thread_handle (handle);
mono_threads_close_thread_handle (handle);
+
+ mono_native_tls_set_value (thread_info_key, NULL);
}
static void
return info;
}
+/*
+ * mono_thread_info_get_small_id
+ *
+ * Retrieve the small ID for the current thread. This is a 16-bit value uniquely
+ * identifying the current thread. Returns -1 if the current thread doesn't have
+ * a small ID assigned.
+ *
+ * To ensure that the calling thread has a small ID assigned, call either
+ * mono_thread_info_attach or mono_thread_info_register_small_id.
+ */
int
mono_thread_info_get_small_id (void)
{
void
mono_threads_attach_tools_thread (void)
{
- int dummy = 0;
MonoThreadInfo *info;
/* Must only be called once */
mono_thread_info_usleep (10);
}
- info = mono_thread_info_attach (&dummy);
+ info = mono_thread_info_attach ();
g_assert (info);
info->tools_thread = TRUE;
}
MonoThreadInfo*
-mono_thread_info_attach (void *baseptr)
+mono_thread_info_attach (void)
{
MonoThreadInfo *info;
+
+#ifdef HOST_WIN32
if (!mono_threads_inited)
{
-#ifdef HOST_WIN32
/* This can happen from DllMain(DLL_THREAD_ATTACH) on Windows, if a
* thread is created before an embedding API user initialized Mono. */
- THREADS_DEBUG ("mono_thread_info_attach called before mono_threads_init\n");
+ THREADS_DEBUG ("mono_thread_info_attach called before mono_thread_info_init\n");
return NULL;
-#else
- g_assert (mono_threads_inited);
-#endif
}
+#endif
+
+ g_assert (mono_threads_inited);
+
info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
if (!info) {
info = (MonoThreadInfo *) g_malloc0 (thread_info_size);
THREADS_DEBUG ("attaching %p\n", info);
- if (!register_thread (info, baseptr))
+ if (!register_thread (info)) {
+ g_free (info);
return NULL;
- } else if (threads_callbacks.thread_attach) {
- threads_callbacks.thread_attach (info);
+ }
}
+
return info;
}
mono_thread_info_detach (void)
{
MonoThreadInfo *info;
+
+#ifdef HOST_WIN32
if (!mono_threads_inited)
{
/* This can happen from DllMain(THREAD_DETACH) on Windows, if a thread
* is created before an embedding API user initialized Mono. */
- THREADS_DEBUG ("mono_thread_info_detach called before mono_threads_init\n");
+ THREADS_DEBUG ("mono_thread_info_detach called before mono_thread_info_init\n");
return;
}
+#endif
+
+ g_assert (mono_threads_inited);
+
info = (MonoThreadInfo *) mono_native_tls_get_value (thread_info_key);
if (info) {
THREADS_DEBUG ("detaching %p\n", info);
unregister_thread (info);
- mono_native_tls_set_value (thread_info_key, NULL);
}
}
+gboolean
+mono_thread_info_try_get_internal_thread_gchandle (MonoThreadInfo *info, guint32 *gchandle)
+{
+ g_assert (info);
+
+ if (info->internal_thread_gchandle == G_MAXUINT32)
+ return FALSE;
+
+ *gchandle = info->internal_thread_gchandle;
+ return TRUE;
+}
+
+void
+mono_thread_info_set_internal_thread_gchandle (MonoThreadInfo *info, guint32 gchandle)
+{
+ g_assert (info);
+ g_assert (gchandle != G_MAXUINT32);
+ info->internal_thread_gchandle = gchandle;
+}
+
+void
+mono_thread_info_unset_internal_thread_gchandle (THREAD_INFO_TYPE *info)
+{
+ g_assert (info);
+ info->internal_thread_gchandle = G_MAXUINT32;
+}
+
/*
* mono_thread_info_is_exiting:
*
#endif
void
-mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t info_size)
+mono_thread_info_init (size_t info_size)
{
gboolean res;
- threads_callbacks = *callbacks;
thread_info_size = info_size;
- const char *sleepLimit;
+ char *sleepLimit;
#ifdef HOST_WIN32
res = mono_native_tls_alloc (&thread_info_key, NULL);
res = mono_native_tls_alloc (&thread_exited_key, NULL);
sleepWarnDuration = threshold / 20;
} else
g_warning("MONO_SLEEP_ABORT_LIMIT must be a number >= 40");
+ g_free (sleepLimit);
}
mono_os_sem_init (&global_suspend_semaphore, 1);
mono_os_sem_init (&suspend_semaphore, 0);
+ mono_os_mutex_init (&join_mutex);
mono_lls_init (&thread_list, NULL);
mono_thread_smr_init ();
mono_threads_suspend_init ();
- mono_threads_suspend_init_signals ();
mono_threads_coop_init ();
+ mono_threads_platform_init ();
#if defined(__MACH__)
mono_mach_init (thread_info_key);
}
void
-mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks)
+mono_thread_info_callbacks_init (MonoThreadInfoCallbacks *callbacks)
+{
+ threads_callbacks = *callbacks;
+}
+
+void
+mono_thread_info_signals_init (void)
+{
+ mono_threads_suspend_init_signals ();
+}
+
+void
+mono_thread_info_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks)
{
runtime_callbacks = *callbacks;
}
static gboolean
is_thread_in_critical_region (MonoThreadInfo *info)
{
- MonoMethod *method;
- MonoJitInfo *ji;
gpointer stack_start;
MonoThreadUnwindState *state;
+ if (mono_threads_platform_in_critical_region (mono_thread_info_get_tid (info)))
+ return TRUE;
+
/* Are we inside a system critical region? */
if (info->inside_critical_region)
return TRUE;
/* Are we inside a GC critical region? */
- if (threads_callbacks.mono_thread_in_critical_region && threads_callbacks.mono_thread_in_critical_region (info)) {
+ if (threads_callbacks.thread_in_critical_region && threads_callbacks.thread_in_critical_region (info)) {
return TRUE;
}
if (threads_callbacks.ip_in_critical_region)
return threads_callbacks.ip_in_critical_region ((MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN], (char *) MONO_CONTEXT_GET_IP (&state->ctx));
- ji = mono_jit_info_table_find (
- (MonoDomain *) state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
- (char *) MONO_CONTEXT_GET_IP (&state->ctx));
-
- if (!ji)
- return FALSE;
-
- method = mono_jit_info_get_method (ji);
-
- return threads_callbacks.mono_method_is_critical (method);
+ return FALSE;
}
gboolean
}
break;
case AsyncSuspendBlocking:
- if (interrupt_kernel && mono_threads_suspend_needs_abort_syscall ())
+ if (interrupt_kernel)
mono_threads_suspend_abort_syscall (info);
- break;
+ return info;
default:
g_assert_not_reached ();
}
void
mono_thread_info_setup_async_call (MonoThreadInfo *info, void (*target_func)(void*), void *user_data)
{
- /* An async call can only be setup on an async suspended thread */
- g_assert (mono_thread_info_run_state (info) == STATE_ASYNC_SUSPENDED);
+ if (!mono_threads_is_coop_enabled ()) {
+ /* In non-coop mode, an async call can only be setup on an async suspended thread, but in coop mode, a thread
+ * may be in blocking state, and will execute the async call when leaving the safepoint, leaving a gc safe
+ * region or entering a gc unsafe region */
+ g_assert (mono_thread_info_run_state (info) == STATE_ASYNC_SUSPENDED);
+ }
/*FIXME this is a bad assert, we probably should do proper locking and fail if one is already set*/
g_assert (!info->async_target);
info->async_target = target_func;
void
mono_thread_info_suspend_lock (void)
{
- mono_thread_info_suspend_lock_with_info (mono_thread_info_current_unchecked ());
+ MonoThreadInfo *info;
+ gint res;
+
+ info = mono_thread_info_current_unchecked ();
+ if (info && mono_thread_info_is_live (info)) {
+ mono_thread_info_suspend_lock_with_info (info);
+ return;
+ }
+
+ /* mono_thread_info_suspend_lock () can be called from boehm-gc.c on_gc_notification before the new thread's
+ * start_wrapper calls mono_thread_info_attach but after pthread_create calls the start wrapper. */
+
+ res = mono_os_sem_wait (&global_suspend_semaphore, MONO_SEM_FLAGS_NONE);
+ g_assert (res != -1);
}
void
MonoThreadHazardPointers *hp;
MonoThreadInfo *info;
- if (tid == mono_native_thread_id_get () || !mono_threads_suspend_needs_abort_syscall ())
+ if (tid == mono_native_thread_id_get ())
return;
hp = mono_hazard_pointer_get ();
return FALSE;
}
-typedef struct {
- MonoRefCount ref;
- MonoThreadStart start_routine;
- gpointer start_routine_arg;
- MonoCoopSem registered;
- MonoThreadHandle *handle;
-} CreateThreadData;
-
-static void
-create_thread_data_destroy (gpointer data)
-{
- CreateThreadData *thread_data;
-
- thread_data = (CreateThreadData*) data;
-
- mono_coop_sem_destroy (&thread_data->registered);
- g_free (thread_data);
-}
-
-static gsize WINAPI
-inner_start_thread (gpointer data)
-{
- CreateThreadData *thread_data;
- MonoThreadInfo *info;
- MonoThreadStart start_routine;
- gpointer start_routine_arg;
- gsize start_routine_res;
- gsize dummy;
-
- thread_data = (CreateThreadData*) data;
- g_assert (thread_data);
-
- start_routine = thread_data->start_routine;
- start_routine_arg = thread_data->start_routine_arg;
-
- info = mono_thread_info_attach (&dummy);
- info->runtime_thread = TRUE;
-
- thread_data->handle = mono_threads_open_thread_handle (info->handle);
-
- mono_coop_sem_post (&thread_data->registered);
-
- mono_refcount_dec (thread_data);
-
- /* thread_data is not valid anymore */
- thread_data = NULL;
-
- /* Run the actual main function of the thread */
- start_routine_res = start_routine (start_routine_arg);
-
- mono_thread_info_exit (start_routine_res);
-
- g_assert_not_reached ();
-}
-
-/*
- * mono_threads_create_thread:
- *
- * Create a new thread executing START with argument ARG. Store its id into OUT_TID.
- * Returns: a windows or io-layer handle for the thread.
- */
-MonoThreadHandle*
-mono_threads_create_thread (MonoThreadStart start, gpointer arg, gsize * const stack_size, MonoNativeThreadId *out_tid)
-{
- CreateThreadData *thread_data;
- gint res;
- MonoThreadHandle *ret;
-
- thread_data = g_new0 (CreateThreadData, 1);
- mono_refcount_init (thread_data, create_thread_data_destroy);
- thread_data->start_routine = start;
- thread_data->start_routine_arg = arg;
- mono_coop_sem_init (&thread_data->registered, 0);
-
- res = mono_threads_platform_create_thread (inner_start_thread, (gpointer) mono_refcount_inc (thread_data), stack_size, out_tid);
- if (res != 0) {
- /* ref is not going to be decremented in inner_start_thread */
- mono_refcount_dec (thread_data);
- ret = NULL;
- goto done;
- }
-
- res = mono_coop_sem_wait (&thread_data->registered, MONO_SEM_FLAGS_NONE);
- g_assert (res == 0);
-
- ret = thread_data->handle;
- g_assert (ret);
-
-done:
- mono_refcount_dec (thread_data);
-
- return ret;
-}
-
/*
* mono_thread_info_get_stack_bounds:
*
{
return mono_threads_platform_yield ();
}
+
static mono_lazy_init_t sleep_init = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
static MonoCoopMutex sleep_mutex;
static MonoCoopCond sleep_cond;
((MonoThreadInfo*)info)->tls [key] = value;
}
-#if defined(__native_client__)
-void nacl_shutdown_gc_thread(void);
-#endif
-
/*
* mono_thread_info_exit:
*
void
mono_thread_info_exit (gsize exit_code)
{
-#if defined(__native_client__)
- nacl_shutdown_gc_thread();
-#endif
-
mono_thread_info_detach ();
mono_threads_platform_exit (0);
{
MonoOSEventWaitRet res;
- res = mono_os_event_wait_one (&thread_handle->event, timeout);
+ res = mono_os_event_wait_one (&thread_handle->event, timeout, alertable);
if (res == MONO_OS_EVENT_WAIT_RET_SUCCESS_0)
return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0;
else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
if (background_change_event)
thread_events [nhandles ++] = background_change_event;
- res = mono_os_event_wait_multiple (thread_events, nhandles, waitall, timeout);
+ res = mono_os_event_wait_multiple (thread_events, nhandles, waitall, timeout, alertable);
if (res >= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 && res <= MONO_OS_EVENT_WAIT_RET_SUCCESS_0 + nhandles - 1)
return MONO_THREAD_INFO_WAIT_RET_SUCCESS_0 + (res - MONO_OS_EVENT_WAIT_RET_SUCCESS_0);
else if (res == MONO_OS_EVENT_WAIT_RET_ALERTED)
else
g_error ("%s: unknown res value %d", __func__, res);
}
+
+/*
+ * mono_threads_join_mutex:
+ *
+ * This mutex is used to avoid races between pthread_create () and pthread_join () on osx, see
+ * https://bugzilla.xamarin.com/show_bug.cgi?id=50529
+ * The code inside the lock should not block.
+ */
+void
+mono_threads_join_lock (void)
+{
+#ifdef TARGET_OSX
+ mono_os_mutex_lock (&join_mutex);
+#endif
+}
+
+void
+mono_threads_join_unlock (void)
+{
+#ifdef TARGET_OSX
+ mono_os_mutex_unlock (&join_mutex);
+#endif
+}
projects / mono.git / blobdiff