* Author:
* Dick Porter (dick@ximian.com)
*
- * (C) 2003 Ximian, Inc.
+ * Copyright 2003 Ximian, Inc (http://www.ximian.com)
+ * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
*/
#include <config.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/marshal.h>
+#include <mono/metadata/profiler-private.h>
#include <mono/utils/mono-time.h>
/*
static __thread gsize tls_pthread_self MONO_TLS_FAST;
#endif
-#ifndef PLATFORM_WIN32
+#ifndef HOST_WIN32
#ifdef HAVE_KW_THREAD
#define GetCurrentThreadId() tls_pthread_self
#else
void
mono_monitor_cleanup (void)
{
+ MonoThreadsSync *mon;
+ /* MonitorArray *marray, *next = NULL; */
+
/*DeleteCriticalSection (&monitor_mutex);*/
+
+ /* The monitors on the freelist don't have weak links - mark them */
+ for (mon = monitor_freelist; mon; mon = mon->data)
+ mon->wait_list = (gpointer)-1;
+
+ /* FIXME: This still crashes with sgen (async_read.exe) */
+ /*
+ for (marray = monitor_allocated; marray; marray = next) {
+ int i;
+
+ for (i = 0; i < marray->num_monitors; ++i) {
+ mon = &marray->monitors [i];
+ if (mon->wait_list != (gpointer)-1)
+ mono_gc_weak_link_remove (&mon->data);
+ }
+
+ next = marray->next;
+ g_free (marray);
+ }
+ */
}
/*
void
mono_monitor_init_tls (void)
{
-#if !defined(PLATFORM_WIN32) && defined(HAVE_KW_THREAD)
+#if !defined(HOST_WIN32) && defined(HAVE_KW_THREAD)
tls_pthread_self = pthread_self ();
#endif
}
static void
mon_finalize (MonoThreadsSync *mon)
{
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": Finalizing sync %p", mon));
+ LOCK_DEBUG (g_message ("%s: Finalizing sync %p", __func__, mon));
if (mon->entry_sem != NULL) {
CloseHandle (mon->entry_sem);
for (i = 0; i < marray->num_monitors; ++i) {
if (marray->monitors [i].data == NULL) {
new = &marray->monitors [i];
+ if (new->wait_list) {
+ /* Orphaned events left by aborted threads */
+ while (new->wait_list) {
+ LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d): Closing orphaned event %d", GetCurrentThreadId (), new->wait_list->data));
+ CloseHandle (new->wait_list->data);
+ new->wait_list = g_slist_remove (new->wait_list, new->wait_list->data);
+ }
+ }
+ mono_gc_weak_link_remove (&new->data);
new->data = monitor_freelist;
monitor_freelist = new;
}
/* need to allocate a new array of monitors */
if (!monitor_freelist) {
MonitorArray *last;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": allocating more monitors: %d", array_size));
+ LOCK_DEBUG (g_message ("%s: allocating more monitors: %d", __func__, array_size));
marray = g_malloc0 (sizeof (MonoArray) + array_size * sizeof (MonoThreadsSync));
marray->num_monitors = array_size;
array_size *= 2;
guint32 then = 0, now, delta;
guint32 waitms;
guint32 ret;
- MonoThread *thread;
+ MonoInternalThread *thread;
- LOCK_DEBUG (g_message(G_GNUC_PRETTY_FUNCTION
- ": (%d) Trying to lock object %p (%d ms)", id, obj, ms));
+ LOCK_DEBUG (g_message("%s: (%d) Trying to lock object %p (%d ms)", __func__, id, obj, ms));
if (G_UNLIKELY (!obj)) {
mono_raise_exception (mono_get_exception_argument_null ("obj"));
mono_monitor_allocator_lock ();
mon = mon_new (id);
if (InterlockedCompareExchangePointer ((gpointer*)&obj->synchronisation, mon, NULL) == NULL) {
- mono_gc_weak_link_add (&mon->data, obj);
+ mono_gc_weak_link_add (&mon->data, obj, FALSE);
mono_monitor_allocator_unlock ();
/* Successfully locked */
return 1;
lw.sync = mon;
lw.lock_word |= LOCK_WORD_FAT_HASH;
if (InterlockedCompareExchangePointer ((gpointer*)&obj->synchronisation, lw.sync, oldlw) == oldlw) {
- mono_gc_weak_link_add (&mon->data, obj);
+ mono_gc_weak_link_add (&mon->data, obj, FALSE);
mono_monitor_allocator_unlock ();
/* Successfully locked */
return 1;
lw.sync = mon;
lw.lock_word |= LOCK_WORD_FAT_HASH;
if (InterlockedCompareExchangePointer ((gpointer*)&obj->synchronisation, lw.sync, oldlw) == oldlw) {
- mono_gc_weak_link_add (&mon->data, obj);
+ mono_gc_weak_link_add (&mon->data, obj, TRUE);
mono_monitor_allocator_unlock ();
/* Successfully locked */
return 1;
/* If ms is 0 we don't block, but just fail straight away */
if (ms == 0) {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) timed out, returning FALSE", id));
+ LOCK_DEBUG (g_message ("%s: (%d) timed out, returning FALSE", __func__, id));
return 0;
}
- /* The slow path begins here. We need to make sure theres a
- * semaphore handle (creating it if necessary), and block on
- * it
+ mono_profiler_monitor_event (obj, MONO_PROFILER_MONITOR_CONTENTION);
+
+ /* The slow path begins here. */
+retry_contended:
+ /* a small amount of duplicated code, but it allows us to insert the profiler
+ * callbacks without impacting the fast path: from here on we don't need to go back to the
+ * retry label, but to retry_contended. At this point mon is already installed in the object
+ * header.
+ */
+ /* This case differs from Dice's case 3 because we don't
+ * deflate locks or cache unused lock records
+ */
+ if (G_LIKELY (mon->owner == 0)) {
+ /* Try to install our ID in the owner field, nest
+ * should have been left at 1 by the previous unlock
+ * operation
+ */
+ if (G_LIKELY (InterlockedCompareExchangePointer ((gpointer *)&mon->owner, (gpointer)id, 0) == 0)) {
+ /* Success */
+ g_assert (mon->nest == 1);
+ mono_profiler_monitor_event (obj, MONO_PROFILER_MONITOR_DONE);
+ return 1;
+ }
+ }
+
+ /* If the object is currently locked by this thread... */
+ if (mon->owner == id) {
+ mon->nest++;
+ mono_profiler_monitor_event (obj, MONO_PROFILER_MONITOR_DONE);
+ return 1;
+ }
+
+ /* We need to make sure there's a semaphore handle (creating it if
+ * necessary), and block on it
*/
if (mon->entry_sem == NULL) {
/* Create the semaphore */
mono_perfcounters->thread_queue_len++;
mono_perfcounters->thread_queue_max++;
- thread = mono_thread_current ();
+ thread = mono_thread_internal_current ();
mono_thread_set_state (thread, ThreadState_WaitSleepJoin);
if (now < then) {
/* The counter must have wrapped around */
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": wrapped around! now=0x%x then=0x%x", now, then));
+ LOCK_DEBUG (g_message ("%s: wrapped around! now=0x%x then=0x%x", __func__, now, then));
now += (0xffffffff - then);
then = 0;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": wrap rejig: now=0x%x then=0x%x delta=0x%x", now, then, now-then));
+ LOCK_DEBUG (g_message ("%s: wrap rejig: now=0x%x then=0x%x delta=0x%x", __func__, now, then, now-then));
}
delta = now - then;
if ((ret == WAIT_TIMEOUT || (ret == WAIT_IO_COMPLETION && !allow_interruption)) && ms > 0) {
/* More time left */
- goto retry;
+ goto retry_contended;
}
} else {
if (ret == WAIT_TIMEOUT || (ret == WAIT_IO_COMPLETION && !allow_interruption)) {
- if (ret == WAIT_IO_COMPLETION && mono_thread_test_state (mono_thread_current (), ThreadState_StopRequested)) {
+ if (ret == WAIT_IO_COMPLETION && (mono_thread_test_state (mono_thread_internal_current (), (ThreadState_StopRequested|ThreadState_SuspendRequested)))) {
/*
- * We have to obey a stop request even if allow_interruption is
- * FALSE to avoid hangs at shutdown.
+ * We have to obey a stop/suspend request even if
+ * allow_interruption is FALSE to avoid hangs at shutdown.
*/
+ mono_profiler_monitor_event (obj, MONO_PROFILER_MONITOR_FAIL);
return -1;
}
/* Infinite wait, so just try again */
- goto retry;
+ goto retry_contended;
}
}
if (ret == WAIT_OBJECT_0) {
/* retry from the top */
- goto retry;
+ goto retry_contended;
}
-
+
/* We must have timed out */
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) timed out waiting, returning FALSE", id));
+ LOCK_DEBUG (g_message ("%s: (%d) timed out waiting, returning FALSE", __func__, id));
+
+ mono_profiler_monitor_event (obj, MONO_PROFILER_MONITOR_FAIL);
if (ret == WAIT_IO_COMPLETION)
return -1;
MonoThreadsSync *mon;
guint32 nest;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Unlocking %p", GetCurrentThreadId (), obj));
+ LOCK_DEBUG (g_message ("%s: (%d) Unlocking %p", __func__, GetCurrentThreadId (), obj));
if (G_UNLIKELY (!obj)) {
mono_raise_exception (mono_get_exception_argument_null ("obj"));
nest = mon->nest - 1;
if (nest == 0) {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": (%d) Object %p is now unlocked", GetCurrentThreadId (), obj));
+ LOCK_DEBUG (g_message ("%s: (%d) Object %p is now unlocked", __func__, GetCurrentThreadId (), obj));
/* object is now unlocked, leave nest==1 so we don't
* need to set it when the lock is reacquired
ReleaseSemaphore (mon->entry_sem, 1, NULL);
}
} else {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": (%d) Object %p is now locked %d times", GetCurrentThreadId (), obj, nest));
+ LOCK_DEBUG (g_message ("%s: (%d) Object %p is now locked %d times", __func__, GetCurrentThreadId (), obj, nest));
mon->nest = nest;
}
}
+void**
+mono_monitor_get_object_monitor_weak_link (MonoObject *object)
+{
+ LockWord lw;
+ MonoThreadsSync *sync = NULL;
+
+ lw.sync = object->synchronisation;
+ if (lw.lock_word & LOCK_WORD_FAT_HASH) {
+ lw.lock_word &= ~LOCK_WORD_BITS_MASK;
+ sync = lw.sync;
+ } else if (!(lw.lock_word & LOCK_WORD_THIN_HASH)) {
+ sync = lw.sync;
+ }
+
+ if (sync && sync->data)
+ return &sync->data;
+ return NULL;
+}
+
static void
emit_obj_syncp_check (MonoMethodBuilder *mb, int syncp_loc, int *obj_null_branch, int *syncp_true_false_branch,
gboolean branch_on_true)
mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
mono_mb_emit_byte (mb, CEE_MONO_TLS);
mono_mb_emit_i4 (mb, thread_tls_offset);
- mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoThread, tid));
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoInternalThread, tid));
mono_mb_emit_byte (mb, CEE_ADD);
mono_mb_emit_byte (mb, CEE_LDIND_I);
mono_mb_emit_stloc (mb, tid_loc);
mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
mono_mb_emit_byte (mb, CEE_MONO_TLS);
mono_mb_emit_i4 (mb, thread_tls_offset);
- mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoThread, tid));
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoInternalThread, tid));
mono_mb_emit_byte (mb, CEE_ADD);
mono_mb_emit_byte (mb, CEE_LDIND_I);
owned_branch = mono_mb_emit_short_branch (mb, CEE_BEQ_S);
return NULL;
}
+/*
+ * mono_monitor_threads_sync_member_offset:
+ * @owner_offset: returns size and offset of the "owner" member
+ * @nest_offset: returns size and offset of the "nest" member
+ * @entry_count_offset: returns size and offset of the "entry_count" member
+ *
+ * Returns the offsets and sizes of three members of the
+ * MonoThreadsSync struct. The Monitor ASM fastpaths need this.
+ */
+void
+mono_monitor_threads_sync_members_offset (int *owner_offset, int *nest_offset, int *entry_count_offset)
+{
+ MonoThreadsSync ts;
+
+#define ENCODE_OFF_SIZE(o,s) (((o) << 8) | ((s) & 0xff))
+
+ *owner_offset = ENCODE_OFF_SIZE (G_STRUCT_OFFSET (MonoThreadsSync, owner), sizeof (ts.owner));
+ *nest_offset = ENCODE_OFF_SIZE (G_STRUCT_OFFSET (MonoThreadsSync, nest), sizeof (ts.nest));
+ *entry_count_offset = ENCODE_OFF_SIZE (G_STRUCT_OFFSET (MonoThreadsSync, entry_count), sizeof (ts.entry_count));
+}
+
gboolean
ves_icall_System_Threading_Monitor_Monitor_try_enter (MonoObject *obj, guint32 ms)
{
return res == 1;
}
+void
+ves_icall_System_Threading_Monitor_Monitor_try_enter_with_atomic_var (MonoObject *obj, guint32 ms, char *lockTaken)
+{
+ gint32 res;
+ do {
+ res = mono_monitor_try_enter_internal (obj, ms, TRUE);
+ /*This means we got interrupted during the wait and didn't got the monitor.*/
+ if (res == -1)
+ mono_thread_interruption_checkpoint ();
+ } while (res == -1);
+ /*It's safe to do it from here since interruption would happen only on the wrapper.*/
+ *lockTaken = res == 1;
+}
+
gboolean
ves_icall_System_Threading_Monitor_Monitor_test_owner (MonoObject *obj)
{
MonoThreadsSync *mon;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": Testing if %p is owned by thread %d", obj, GetCurrentThreadId()));
+ LOCK_DEBUG (g_message ("%s: Testing if %p is owned by thread %d", __func__, obj, GetCurrentThreadId()));
mon = obj->synchronisation;
#ifdef HAVE_MOVING_COLLECTOR
{
MonoThreadsSync *mon;
- LOCK_DEBUG (g_message(G_GNUC_PRETTY_FUNCTION
- ": (%d) Testing if %p is owned by any thread", GetCurrentThreadId (), obj));
+ LOCK_DEBUG (g_message("%s: (%d) Testing if %p is owned by any thread", __func__, GetCurrentThreadId (), obj));
mon = obj->synchronisation;
#ifdef HAVE_MOVING_COLLECTOR
{
MonoThreadsSync *mon;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Pulsing %p",
- GetCurrentThreadId (), obj));
+ LOCK_DEBUG (g_message ("%s: (%d) Pulsing %p", __func__, GetCurrentThreadId (), obj));
mon = obj->synchronisation;
#ifdef HAVE_MOVING_COLLECTOR
return;
}
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) %d threads waiting",
- GetCurrentThreadId (), g_slist_length (mon->wait_list)));
+ LOCK_DEBUG (g_message ("%s: (%d) %d threads waiting", __func__, GetCurrentThreadId (), g_slist_length (mon->wait_list)));
if (mon->wait_list != NULL) {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": (%d) signalling and dequeuing handle %p",
- GetCurrentThreadId (), mon->wait_list->data));
+ LOCK_DEBUG (g_message ("%s: (%d) signalling and dequeuing handle %p", __func__, GetCurrentThreadId (), mon->wait_list->data));
SetEvent (mon->wait_list->data);
mon->wait_list = g_slist_remove (mon->wait_list, mon->wait_list->data);
{
MonoThreadsSync *mon;
- LOCK_DEBUG (g_message(G_GNUC_PRETTY_FUNCTION ": (%d) Pulsing all %p",
- GetCurrentThreadId (), obj));
+ LOCK_DEBUG (g_message("%s: (%d) Pulsing all %p", __func__, GetCurrentThreadId (), obj));
mon = obj->synchronisation;
#ifdef HAVE_MOVING_COLLECTOR
return;
}
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) %d threads waiting",
- GetCurrentThreadId (), g_slist_length (mon->wait_list)));
+ LOCK_DEBUG (g_message ("%s: (%d) %d threads waiting", __func__, GetCurrentThreadId (), g_slist_length (mon->wait_list)));
while (mon->wait_list != NULL) {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": (%d) signalling and dequeuing handle %p",
- GetCurrentThreadId (), mon->wait_list->data));
+ LOCK_DEBUG (g_message ("%s: (%d) signalling and dequeuing handle %p", __func__, GetCurrentThreadId (), mon->wait_list->data));
SetEvent (mon->wait_list->data);
mon->wait_list = g_slist_remove (mon->wait_list, mon->wait_list->data);
guint32 ret;
gboolean success = FALSE;
gint32 regain;
- MonoThread *thread = mono_thread_current ();
+ MonoInternalThread *thread = mono_thread_internal_current ();
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION
- ": (%d) Trying to wait for %p with timeout %dms",
- GetCurrentThreadId (), obj, ms));
+ LOCK_DEBUG (g_message ("%s: (%d) Trying to wait for %p with timeout %dms", __func__, GetCurrentThreadId (), obj, ms));
mon = obj->synchronisation;
#ifdef HAVE_MOVING_COLLECTOR
return FALSE;
}
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) queuing handle %p",
- GetCurrentThreadId (), event));
+ LOCK_DEBUG (g_message ("%s: (%d) queuing handle %p", __func__, GetCurrentThreadId (), event));
mono_thread_current_check_pending_interrupt ();
mon->nest = 1;
mono_monitor_exit (obj);
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Unlocked %p lock %p",
- GetCurrentThreadId (), obj, mon));
+ LOCK_DEBUG (g_message ("%s: (%d) Unlocked %p lock %p", __func__, GetCurrentThreadId (), obj, mon));
/* There's no race between unlocking mon and waiting for the
* event, because auto reset events are sticky, and this event
mono_thread_clr_state (thread, ThreadState_WaitSleepJoin);
if (mono_thread_interruption_requested ()) {
- CloseHandle (event);
+ /*
+ * Can't remove the event from wait_list, since the monitor is not locked by
+ * us. So leave it there, mon_new () will delete it when the mon structure
+ * is placed on the free list.
+ * FIXME: The caller expects to hold the lock after the wait returns, but it
+ * doesn't happen in this case:
+ * http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=97268
+ */
return FALSE;
}
mon->nest = nest;
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Regained %p lock %p",
- GetCurrentThreadId (), obj, mon));
+ LOCK_DEBUG (g_message ("%s: (%d) Regained %p lock %p", __func__, GetCurrentThreadId (), obj, mon));
if (ret == WAIT_TIMEOUT) {
/* Poll the event again, just in case it was signalled
*/
if (ret == WAIT_OBJECT_0) {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Success",
- GetCurrentThreadId ()));
+ LOCK_DEBUG (g_message ("%s: (%d) Success", __func__, GetCurrentThreadId ()));
success = TRUE;
} else {
- LOCK_DEBUG (g_message (G_GNUC_PRETTY_FUNCTION ": (%d) Wait failed, dequeuing handle %p",
- GetCurrentThreadId (), event));
+ LOCK_DEBUG (g_message ("%s: (%d) Wait failed, dequeuing handle %p", __func__, GetCurrentThreadId (), event));
/* No pulse, so we have to remove ourself from the
* wait queue
*/
projects / mono.git / blobdiff