2 * mono-threads-posix.c: Low-level threading, posix version
5 * Rodrigo Kumpera (kumpera@gmail.com)
12 /* For pthread_main_np, pthread_get_stackaddr_np and pthread_get_stacksize_np */
13 #if defined (__MACH__)
14 #define _DARWIN_C_SOURCE 1
17 #include <mono/utils/mono-threads.h>
18 #include <mono/utils/mono-threads-posix-signals.h>
19 #include <mono/utils/mono-coop-semaphore.h>
20 #include <mono/metadata/gc-internals.h>
21 #include <mono/utils/w32handle.h>
25 #if defined(PLATFORM_ANDROID) && !defined(TARGET_ARM64) && !defined(TARGET_AMD64)
26 #define USE_TKILL_ON_ANDROID 1
29 #ifdef USE_TKILL_ON_ANDROID
30 extern int tkill (pid_t tid, int signal);
33 #if defined(_POSIX_VERSION) || defined(__native_client__)
37 #include <sys/resource.h>
39 #if defined(__native_client__)
40 void nacl_shutdown_gc_thread(void);
45 GPtrArray *owned_mutexes;
47 } MonoW32HandleThread;
50 thread_handle_create (void)
52 MonoW32HandleThread thread_data;
53 gpointer thread_handle;
55 thread_data.id = pthread_self ();
56 thread_data.owned_mutexes = g_ptr_array_new ();
57 thread_data.priority = MONO_THREAD_PRIORITY_NORMAL;
59 thread_handle = mono_w32handle_new (MONO_W32HANDLE_THREAD, (gpointer) &thread_data);
60 if (thread_handle == INVALID_HANDLE_VALUE)
63 /* We need to keep the handle alive, as long as the corresponding managed
64 * thread object is alive. The handle is going to be unref when calling
65 * the finalizer on the MonoThreadInternal object */
66 mono_w32handle_ref (thread_handle);
72 win32_priority_to_posix_priority (MonoThreadPriority priority, int policy)
74 g_assert (priority >= MONO_THREAD_PRIORITY_LOWEST);
75 g_assert (priority <= MONO_THREAD_PRIORITY_HIGHEST);
77 /* Necessary to get valid priority range */
78 #ifdef _POSIX_PRIORITY_SCHEDULING
81 min = sched_get_priority_min (policy);
82 max = sched_get_priority_max (policy);
84 /* Partition priority range linearly (cross-multiply) */
85 if (max > 0 && min >= 0 && max > min)
86 return (int)((double) priority * (max - min) / (MONO_THREAD_PRIORITY_HIGHEST - MONO_THREAD_PRIORITY_LOWEST));
104 mono_threads_platform_register (MonoThreadInfo *info)
106 g_assert (!info->handle);
107 info->handle = thread_handle_create ();
111 void *(*start_routine)(void*);
115 MonoCoopSem registered;
120 inner_start_thread (void *arg)
122 StartInfo *start_info = (StartInfo *) arg;
123 void *t_arg = start_info->arg;
125 void *(*start_func)(void*) = start_info->start_routine;
126 guint32 flags = start_info->flags;
128 MonoThreadInfo *info;
130 info = mono_thread_info_attach (&result);
131 info->runtime_thread = TRUE;
133 start_info->handle = info->handle;
135 mono_threads_platform_set_priority (info, start_info->priority);
137 if (flags & CREATE_SUSPENDED) {
138 info->create_suspended = TRUE;
139 mono_coop_sem_init (&info->create_suspended_sem, 0);
142 /* start_info is not valid after this */
143 mono_coop_sem_post (&(start_info->registered));
146 if (flags & CREATE_SUSPENDED) {
147 res = mono_coop_sem_wait (&info->create_suspended_sem, MONO_SEM_FLAGS_NONE);
148 g_assert (res != -1);
150 mono_coop_sem_destroy (&info->create_suspended_sem);
153 /* Run the actual main function of the thread */
154 result = start_func (t_arg);
156 mono_threads_platform_exit (GPOINTER_TO_UINT (result));
157 g_assert_not_reached ();
161 mono_threads_platform_create_thread (MonoThreadStart start_routine, gpointer arg, MonoThreadParm *tp, MonoNativeThreadId *out_tid)
166 StartInfo start_info;
169 struct sched_param sp;
171 res = pthread_attr_init (&attr);
174 if (tp->stack_size == 0) {
175 #if HAVE_VALGRIND_MEMCHECK_H
176 if (RUNNING_ON_VALGRIND)
177 stack_size = 1 << 20;
179 stack_size = (SIZEOF_VOID_P / 4) * 1024 * 1024;
181 stack_size = (SIZEOF_VOID_P / 4) * 1024 * 1024;
184 stack_size = tp->stack_size;
186 #ifdef PTHREAD_STACK_MIN
187 if (stack_size < PTHREAD_STACK_MIN)
188 stack_size = PTHREAD_STACK_MIN;
191 #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
192 res = pthread_attr_setstacksize (&attr, stack_size);
197 * For policies that respect priorities set the prirority for the new thread
199 pthread_getschedparam(pthread_self(), &policy, &sp);
200 if ((policy == SCHED_FIFO) || (policy == SCHED_RR)) {
201 sp.sched_priority = win32_priority_to_posix_priority (tp->priority, policy);
202 res = pthread_attr_setschedparam (&attr, &sp);
205 memset (&start_info, 0, sizeof (StartInfo));
206 start_info.start_routine = (void *(*)(void *)) start_routine;
207 start_info.arg = arg;
208 start_info.flags = tp->creation_flags;
209 start_info.priority = tp->priority;
210 mono_coop_sem_init (&(start_info.registered), 0);
212 /* Actually start the thread */
213 res = mono_gc_pthread_create (&thread, &attr, inner_start_thread, &start_info);
215 mono_coop_sem_destroy (&(start_info.registered));
219 /* Wait until the thread register itself in various places */
220 res = mono_coop_sem_wait (&start_info.registered, MONO_SEM_FLAGS_NONE);
221 g_assert (res != -1);
223 mono_coop_sem_destroy (&(start_info.registered));
228 return start_info.handle;
232 * mono_threads_platform_resume_created:
234 * Resume a newly created thread created using CREATE_SUSPENDED.
237 mono_threads_platform_resume_created (MonoThreadInfo *info, MonoNativeThreadId tid)
239 mono_coop_sem_post (&info->create_suspended_sem);
243 mono_threads_platform_yield (void)
245 return sched_yield () == 0;
249 mono_threads_platform_exit (int exit_code)
251 #if defined(__native_client__)
252 nacl_shutdown_gc_thread();
255 mono_thread_info_detach ();
261 mono_threads_platform_unregister (MonoThreadInfo *info)
263 mono_threads_platform_set_exited (info);
267 mono_threads_platform_open_handle (void)
269 MonoThreadInfo *info;
271 info = mono_thread_info_current ();
273 g_assert (info->handle);
275 mono_w32handle_ref (info->handle);
281 mono_threads_get_max_stack_size (void)
285 /* If getrlimit fails, we don't enforce any limits. */
286 if (getrlimit (RLIMIT_STACK, &lim))
288 /* rlim_t is an unsigned long long on 64bits OSX but we want an int response. */
289 if (lim.rlim_max > (rlim_t)INT_MAX)
291 return (int)lim.rlim_max;
295 mono_threads_platform_open_thread_handle (HANDLE handle, MonoNativeThreadId tid)
297 mono_w32handle_ref (handle);
303 mono_threads_pthread_kill (MonoThreadInfo *info, int signum)
305 THREADS_SUSPEND_DEBUG ("sending signal %d to %p[%p]\n", signum, info, mono_thread_info_get_tid (info));
306 #ifdef USE_TKILL_ON_ANDROID
307 int result, old_errno = errno;
308 result = tkill (info->native_handle, signum);
314 #elif defined(__native_client__)
315 /* Workaround pthread_kill abort() in NaCl glibc. */
317 #elif !defined(HAVE_PTHREAD_KILL)
318 g_error ("pthread_kill() is not supported by this platform");
320 return pthread_kill (mono_thread_info_get_tid (info), signum);
325 mono_native_thread_id_get (void)
327 return pthread_self ();
331 mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2)
333 return pthread_equal (id1, id2);
337 * mono_native_thread_create:
339 * Low level thread creation function without any GC wrappers.
342 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg)
344 return pthread_create (tid, NULL, (void *(*)(void *)) func, arg) == 0;
348 mono_native_thread_set_name (MonoNativeThreadId tid, const char *name)
352 * We can't set the thread name for other threads, but we can at least make
353 * it work for threads that try to change their own name.
355 if (tid != mono_native_thread_id_get ())
359 pthread_setname_np ("");
363 strncpy (n, name, 63);
365 pthread_setname_np (n);
367 #elif defined (__NetBSD__)
369 pthread_setname_np (tid, "%s", (void*)"");
371 char n [PTHREAD_MAX_NAMELEN_NP];
373 strncpy (n, name, PTHREAD_MAX_NAMELEN_NP);
374 n [PTHREAD_MAX_NAMELEN_NP - 1] = '\0';
375 pthread_setname_np (tid, "%s", (void*)n);
377 #elif defined (HAVE_PTHREAD_SETNAME_NP)
379 pthread_setname_np (tid, "");
383 strncpy (n, name, 16);
385 pthread_setname_np (tid, n);
391 mono_threads_platform_set_exited (MonoThreadInfo *info)
393 MonoW32HandleThread *thread_data;
394 gpointer mutex_handle;
399 g_assert (info->handle);
401 if (mono_w32handle_issignalled (info->handle) || mono_w32handle_get_type (info->handle) == MONO_W32HANDLE_UNUSED) {
402 /* We must have already deliberately finished
403 * with this thread, so don't do any more now */
407 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer*) &thread_data))
408 g_error ("unknown thread handle %p", info->handle);
410 pid = wapi_getpid ();
411 tid = pthread_self ();
413 for (i = 0; i < thread_data->owned_mutexes->len; i++) {
414 mutex_handle = g_ptr_array_index (thread_data->owned_mutexes, i);
415 wapi_mutex_abandon (mutex_handle, pid, tid);
416 mono_thread_info_disown_mutex (info, mutex_handle);
419 g_ptr_array_free (thread_data->owned_mutexes, TRUE);
421 thr_ret = mono_w32handle_lock_handle (info->handle);
422 g_assert (thr_ret == 0);
424 mono_w32handle_set_signal_state (info->handle, TRUE, TRUE);
426 thr_ret = mono_w32handle_unlock_handle (info->handle);
427 g_assert (thr_ret == 0);
429 /* The thread is no longer active, so unref it */
430 mono_w32handle_unref (info->handle);
436 mono_threads_platform_describe (MonoThreadInfo *info, GString *text)
438 MonoW32HandleThread *thread_data;
441 g_assert (info->handle);
443 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer*) &thread_data))
444 g_error ("unknown thread handle %p", info->handle);
446 g_string_append_printf (text, "thread handle %p state : ", info->handle);
448 mono_thread_info_describe_interrupt_token (info, text);
450 g_string_append_printf (text, ", owns (");
451 for (i = 0; i < thread_data->owned_mutexes->len; i++)
452 g_string_append_printf (text, i > 0 ? ", %p" : "%p", g_ptr_array_index (thread_data->owned_mutexes, i));
453 g_string_append_printf (text, ")");
457 mono_threads_platform_own_mutex (MonoThreadInfo *info, gpointer mutex_handle)
459 MonoW32HandleThread *thread_data;
461 g_assert (info->handle);
463 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer*) &thread_data))
464 g_error ("unknown thread handle %p", info->handle);
466 mono_w32handle_ref (mutex_handle);
468 g_ptr_array_add (thread_data->owned_mutexes, mutex_handle);
472 mono_threads_platform_disown_mutex (MonoThreadInfo *info, gpointer mutex_handle)
474 MonoW32HandleThread *thread_data;
476 g_assert (info->handle);
478 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer*) &thread_data))
479 g_error ("unknown thread handle %p", info->handle);
481 mono_w32handle_unref (mutex_handle);
483 g_ptr_array_remove (thread_data->owned_mutexes, mutex_handle);
487 mono_threads_platform_get_priority (MonoThreadInfo *info)
489 MonoW32HandleThread *thread_data;
491 g_assert (info->handle);
493 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer *)&thread_data))
494 return MONO_THREAD_PRIORITY_NORMAL;
496 return thread_data->priority;
500 mono_threads_platform_set_priority (MonoThreadInfo *info, MonoThreadPriority priority)
502 MonoW32HandleThread *thread_data;
503 int policy, posix_priority;
504 struct sched_param param;
506 g_assert (info->handle);
508 if (!mono_w32handle_lookup (info->handle, MONO_W32HANDLE_THREAD, (gpointer*) &thread_data))
511 switch (pthread_getschedparam (thread_data->id, &policy, ¶m)) {
515 g_warning ("pthread_getschedparam: error looking up thread id %x", (gsize)thread_data->id);
521 posix_priority = win32_priority_to_posix_priority (priority, policy);
522 if (posix_priority < 0)
525 param.sched_priority = posix_priority;
526 switch (pthread_setschedparam (thread_data->id, policy, ¶m)) {
530 g_warning ("%s: pthread_setschedprio: error looking up thread id %x", __func__, (gsize)thread_data->id);
533 g_warning ("%s: priority %d not supported", __func__, priority);
536 g_warning ("%s: permission denied", __func__);
542 thread_data->priority = priority;
547 static void thread_details (gpointer data)
549 MonoW32HandleThread *thread = (MonoW32HandleThread*) data;
550 g_print ("id: %p, owned_mutexes: %d, priority: %d",
551 thread->id, thread->owned_mutexes->len, thread->priority);
554 static const gchar* thread_typename (void)
559 static gsize thread_typesize (void)
561 return sizeof (MonoW32HandleThread);
564 static MonoW32HandleOps thread_ops = {
569 NULL, /* special_wait */
571 thread_details, /* details */
572 thread_typename, /* typename */
573 thread_typesize, /* typesize */
577 mono_threads_platform_init (void)
579 mono_w32handle_register_ops (MONO_W32HANDLE_THREAD, &thread_ops);
581 mono_w32handle_register_capabilities (MONO_W32HANDLE_THREAD, MONO_W32HANDLE_CAP_WAIT);
584 #endif /* defined(_POSIX_VERSION) || defined(__native_client__) */
586 #if defined(USE_POSIX_BACKEND)
589 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
591 int sig = interrupt_kernel ? mono_threads_posix_get_abort_signal () : mono_threads_posix_get_suspend_signal ();
593 if (!mono_threads_pthread_kill (info, sig)) {
594 mono_threads_add_to_pending_operation_set (info);
601 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
603 return info->suspend_can_continue;
607 This begins async resume. This function must do the following:
609 - Install an async target if one was requested.
610 - Notify the target to resume.
613 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
615 mono_threads_add_to_pending_operation_set (info);
616 return mono_threads_pthread_kill (info, mono_threads_posix_get_restart_signal ()) == 0;
620 mono_threads_suspend_register (MonoThreadInfo *info)
622 #if defined (PLATFORM_ANDROID)
623 info->native_handle = gettid ();
628 mono_threads_suspend_free (MonoThreadInfo *info)
633 mono_threads_suspend_init (void)
635 mono_threads_posix_init_signals (MONO_THREADS_POSIX_INIT_SIGNALS_SUSPEND_RESTART);
638 #endif /* defined(USE_POSIX_BACKEND) */