/*
WARNING:
If we are trying to suspend a target that is on a critical region
and running a syscall we risk looping forever if @interrupt_kernel is FALSE.
So, be VERY carefull in calling this with @interrupt_kernel == FALSE.
Info is not put on a hazard pointer as a suspended thread cannot exit and be freed.
This function MUST be matched with mono_thread_info_finish_suspend or mono_thread_info_finish_suspend_and_resume
*/
MonoThreadInfo*
mono_thread_info_safe_suspend_sync (MonoNativeThreadId id, gboolean interrupt_kernel)
{
MonoThreadInfo *info = NULL;
int sleep_duration = 0;
/*FIXME: unify this with self-suspend*/
g_assert (id != mono_native_thread_id_get ());
mono_thread_info_suspend_lock ();
for (;;) {
const char *suspend_error = "Unknown error";
if (!(info = mono_thread_info_suspend_sync (id, interrupt_kernel, &suspend_error))) {
g_warning ("failed to suspend thread %p due to %s, hopefully it is dead", (gpointer)id, suspend_error);
mono_thread_info_suspend_unlock ();
return NULL;
}
/*WARNING: We now are in interrupt context until we resume the thread. */
if (!is_thread_in_critical_region (info))
break;
if (!mono_thread_info_core_resume (info)) {
g_warning ("failed to resume thread %p, hopefully it is dead", (gpointer)id);
mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
mono_thread_info_suspend_unlock ();
return NULL;
}
THREADS_DEBUG ("restarted thread %p\n", (gpointer)id);
if (!sleep_duration) {
#ifdef HOST_WIN32
SwitchToThread ();
#else
sched_yield ();
#endif
}
else {
g_usleep (sleep_duration);
}
sleep_duration += 10;
}
/* XXX this clears HP 1, so we restated it again */
mono_atomic_store_release (&mono_thread_info_current ()->inside_critical_region, TRUE);
mono_thread_info_suspend_unlock ();
return info;
}
/*
WARNING:
If we are trying to suspend a target that is on a critical region
and running a syscall we risk looping forever if @interrupt_kernel is FALSE.
So, be VERY carefull in calling this with @interrupt_kernel == FALSE.
*/
MonoThreadInfo*
mono_thread_info_safe_suspend_sync (MonoNativeThreadId id, gboolean interrupt_kernel)
{
MonoThreadInfo *info = NULL;
int sleep_duration = 0;
/*FIXME: unify this with self-suspend*/
g_assert (id != mono_native_thread_id_get ());
mono_thread_info_suspend_lock ();
for (;;) {
if (!(info = mono_thread_info_suspend_sync (id, interrupt_kernel))) {
g_warning ("failed to suspend thread %p, hopefully it is dead", (gpointer)id);
mono_thread_info_suspend_unlock ();
return NULL;
}
/*WARNING: We now are in interrupt context until we resume the thread. */
if (!is_thread_in_critical_region (info))
break;
if (!mono_thread_info_resume (id)) {
g_warning ("failed to result thread %p, hopefully it is dead", (gpointer)id);
mono_thread_info_suspend_unlock ();
return NULL;
}
THREADS_DEBUG ("restarted thread %p\n", (gpointer)id);
if (!sleep_duration) {
#ifdef HOST_WIN32
SwitchToThread ();
#else
sched_yield ();
#endif
}
else {
g_usleep (sleep_duration);
}
sleep_duration += 10;
}
mono_thread_info_suspend_unlock ();
return info;
}
static MonoThreadInfo*
suspend_sync_nolock (MonoNativeThreadId id, gboolean interrupt_kernel)
{
MonoThreadInfo *info = NULL;
int sleep_duration = 0;
for (;;) {
const char *suspend_error = "Unknown error";
if (!(info = mono_thread_info_suspend_sync (id, interrupt_kernel, &suspend_error))) {
mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
return NULL;
}
/*WARNING: We now are in interrupt context until we resume the thread. */
if (!is_thread_in_critical_region (info))
break;
if (!mono_thread_info_core_resume (info)) {
mono_hazard_pointer_clear (mono_hazard_pointer_get (), 1);
return NULL;
}
THREADS_SUSPEND_DEBUG ("RESTARTED thread tid %p\n", (void*)id);
/* Wait for the pending resume to finish */
mono_threads_wait_pending_operations ();
if (!sleep_duration) {
#ifdef HOST_WIN32
SwitchToThread ();
#else
sched_yield ();
#endif
}
else {
g_usleep (sleep_duration);
}
sleep_duration += 10;
}
return info;
}