static void
set_tp_thread_info (ThreadPool *tp)
{
const gchar *name;
MonoInternalThread *thread = mono_thread_internal_current ();
mono_profiler_thread_start (thread->tid);
name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker";
mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), name), FALSE);
}
static void
async_invoke_thread (gpointer data)
{
MonoDomain *domain;
MonoInternalThread *thread;
MonoWSQ *wsq;
ThreadPool *tp;
gboolean must_die;
const gchar *name;
tp = data;
wsq = NULL;
if (!tp->is_io)
wsq = add_wsq ();
thread = mono_thread_internal_current ();
mono_profiler_thread_start (thread->tid);
name = (tp->is_io) ? "IO Threadpool worker" : "Threadpool worker";
mono_thread_set_name_internal (thread, mono_string_new (mono_domain_get (), name), FALSE);
if (tp_start_func)
tp_start_func (tp_hooks_user_data);
data = NULL;
for (;;) {
MonoAsyncResult *ar;
MonoClass *klass;
gboolean is_io_task;
gboolean is_socket;
int n_naps = 0;
is_io_task = FALSE;
ar = (MonoAsyncResult *) data;
if (ar) {
InterlockedIncrement (&tp->busy_threads);
domain = ((MonoObject *)ar)->vtable->domain;
#ifndef DISABLE_SOCKETS
klass = ((MonoObject *) data)->vtable->klass;
is_io_task = !is_corlib_asyncresult (domain, klass);
is_socket = FALSE;
if (is_io_task) {
MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
is_socket = is_socketasyncresult (domain, klass);
ar = state->ares;
switch (state->operation) {
case AIO_OP_RECEIVE:
state->total = ICALL_RECV (state);
break;
case AIO_OP_SEND:
state->total = ICALL_SEND (state);
break;
}
}
#endif
/* worker threads invokes methods in different domains,
* so we need to set the right domain here */
g_assert (domain);
if (mono_domain_is_unloading (domain) || mono_runtime_is_shutting_down ()) {
threadpool_jobs_dec ((MonoObject *)ar);
data = NULL;
ar = NULL;
InterlockedDecrement (&tp->busy_threads);
} else {
mono_thread_push_appdomain_ref (domain);
if (threadpool_jobs_dec ((MonoObject *)ar)) {
data = NULL;
ar = NULL;
mono_thread_pop_appdomain_ref ();
InterlockedDecrement (&tp->busy_threads);
continue;
}
if (mono_domain_set (domain, FALSE)) {
MonoObject *exc;
if (tp_item_begin_func)
tp_item_begin_func (tp_item_user_data);
if (!is_io_task && ar->add_time > 0)
process_idle_times (tp, ar->add_time);
exc = mono_async_invoke (tp, ar);
if (tp_item_end_func)
tp_item_end_func (tp_item_user_data);
if (exc)
mono_internal_thread_unhandled_exception (exc);
if (is_socket && tp->is_io) {
MonoSocketAsyncResult *state = (MonoSocketAsyncResult *) data;
if (state->completed && state->callback) {
MonoAsyncResult *cb_ares;
cb_ares = create_simple_asyncresult ((MonoObject *) state->callback,
(MonoObject *) state);
icall_append_job ((MonoObject *) cb_ares);
}
}
mono_domain_set (mono_get_root_domain (), TRUE);
}
mono_thread_pop_appdomain_ref ();
InterlockedDecrement (&tp->busy_threads);
/* If the callee changes the background status, set it back to TRUE */
mono_thread_clr_state (thread , ~ThreadState_Background);
if (!mono_thread_test_state (thread , ThreadState_Background))
ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
}
}
ar = NULL;
data = NULL;
must_die = should_i_die (tp);
if (!must_die && (tp->is_io || !mono_wsq_local_pop (&data)))
dequeue_or_steal (tp, &data, wsq);
n_naps = 0;
while (!must_die && !data && n_naps < 4) {
gboolean res;
InterlockedIncrement (&tp->waiting);
// Another thread may have added a job into its wsq since the last call to dequeue_or_steal
// Check all the queues again before entering the wait loop
dequeue_or_steal (tp, &data, wsq);
if (data) {
InterlockedDecrement (&tp->waiting);
break;
}
mono_gc_set_skip_thread (TRUE);
#if defined(__OpenBSD__)
while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_wait (&tp->new_job, TRUE)) == -1) {// && errno == EINTR) {
#else
while (mono_cq_count (tp->queue) == 0 && (res = mono_sem_timedwait (&tp->new_job, 2000, TRUE)) == -1) {// && errno == EINTR) {
#endif
if (mono_runtime_is_shutting_down ())
break;
if (THREAD_WANTS_A_BREAK (thread))
mono_thread_interruption_checkpoint ();
}
InterlockedDecrement (&tp->waiting);
mono_gc_set_skip_thread (FALSE);
if (mono_runtime_is_shutting_down ())
break;
must_die = should_i_die (tp);
dequeue_or_steal (tp, &data, wsq);
n_naps++;
}
if (!data && !tp->is_io && !mono_runtime_is_shutting_down ()) {
mono_wsq_local_pop (&data);
if (data && must_die) {
InterlockedCompareExchange (&tp->destroy_thread, 1, 0);
pulse_on_new_job (tp);
}
}
if (!data) {
gint nt;
gboolean down;
while (1) {
nt = tp->nthreads;
down = mono_runtime_is_shutting_down ();
if (!down && nt <= tp->min_threads)
break;
if (down || InterlockedCompareExchange (&tp->nthreads, nt - 1, nt) == nt) {
mono_perfcounter_update_value (tp->pc_nthreads, TRUE, -1);
if (!tp->is_io) {
remove_wsq (wsq);
}
mono_profiler_thread_end (thread->tid);
if (tp_finish_func)
tp_finish_func (tp_hooks_user_data);
return;
}
}
}
}
g_assert_not_reached ();
}
void
ves_icall_System_Threading_ThreadPool_GetAvailableThreads (gint *workerThreads, gint *completionPortThreads)
{
*workerThreads = async_tp.max_threads - async_tp.busy_threads;
*completionPortThreads = async_io_tp.max_threads - async_io_tp.busy_threads;
}
static gsize
sampling_thread_func (gpointer unused)
{
MonoInternalThread *thread = mono_thread_internal_current ();
thread->flags |= MONO_THREAD_FLAG_DONT_MANAGE;
ERROR_DECL (error);
MonoString *name = mono_string_new_checked (mono_get_root_domain (), "Profiler Sampler", error);
mono_error_assert_ok (error);
mono_thread_set_name_internal (thread, name, FALSE, FALSE, error);
mono_error_assert_ok (error);
mono_thread_info_set_flags (MONO_THREAD_INFO_FLAGS_NO_GC | MONO_THREAD_INFO_FLAGS_NO_SAMPLE);
int old_policy;
struct sched_param old_sched;
pthread_getschedparam (pthread_self (), &old_policy, &old_sched);
/*
* Attempt to switch the thread to real time scheduling. This will not
* necessarily work on all OSs; for example, most Linux systems will give
* us EPERM here unless configured to allow this.
*
* TODO: This does not work on Mac (and maybe some other OSs). On Mac, we
* have to use the Mach thread policy routines to switch to real-time
* scheduling. This is quite tricky as we need to specify how often we'll
* be doing work (easy), the normal processing time needed (also easy),
* and the maximum amount of processing time needed (hard). This is
* further complicated by the fact that if we misbehave and take too long
* to do our work, the kernel may knock us back down to the normal thread
* scheduling policy without telling us.
*/
struct sched_param sched = { .sched_priority = sched_get_priority_max (SCHED_FIFO) };
pthread_setschedparam (pthread_self (), SCHED_FIFO, &sched);
MonoProfilerSampleMode mode;
init:
mono_profiler_get_sample_mode (NULL, &mode, NULL);
if (mode == MONO_PROFILER_SAMPLE_MODE_NONE) {
mono_profiler_sampling_thread_wait ();
if (!mono_atomic_load_i32 (&sampling_thread_running))
goto done;
goto init;
}
clock_init (mode);
for (guint64 sleep = clock_get_time_ns (); mono_atomic_load_i32 (&sampling_thread_running); clock_sleep_ns_abs (sleep)) {
uint32_t freq;
MonoProfilerSampleMode new_mode;
mono_profiler_get_sample_mode (NULL, &new_mode, &freq);
if (new_mode != mode) {
clock_cleanup ();
goto init;
}
sleep += 1000000000 / freq;
FOREACH_THREAD_SAFE_EXCLUDE (info, MONO_THREAD_INFO_FLAGS_NO_SAMPLE) {
g_assert (mono_thread_info_get_tid (info) != sampling_thread);
/*
* Require an ack for the last sampling signal sent to the thread
* so that we don't overflow the signal queue, leading to all sorts
* of problems (e.g. GC STW failing).
*/
if (profiler_signal != SIGPROF && !mono_atomic_cas_i32 (&info->profiler_signal_ack, 0, 1))
continue;
mono_threads_pthread_kill (info, profiler_signal);
mono_atomic_inc_i32 (&profiler_signals_sent);
} FOREACH_THREAD_SAFE_END
}
