2 * mono-threads.h: Low-level threading
5 * Rodrigo Kumpera (kumpera@gmail.com)
10 #ifndef __MONO_THREADS_H__
11 #define __MONO_THREADS_H__
13 #include <mono/utils/mono-semaphore.h>
14 #include <mono/utils/mono-stack-unwinding.h>
15 #include <mono/utils/mono-linked-list-set.h>
16 #include <mono/utils/mono-mutex.h>
17 #include <mono/utils/mono-tls.h>
25 typedef DWORD MonoNativeThreadId;
26 typedef HANDLE MonoNativeThreadHandle; /* unused */
28 typedef DWORD mono_native_thread_return_t;
30 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (tid)
31 #define MONO_UINT_TO_NATIVE_THREAD_ID(tid) ((MonoNativeThreadId)(tid))
38 #include <mono/utils/mach-support.h>
40 typedef thread_port_t MonoNativeThreadHandle;
46 typedef pid_t MonoNativeThreadHandle;
48 #endif /* defined(__MACH__) */
50 typedef pthread_t MonoNativeThreadId;
52 typedef void* mono_native_thread_return_t;
54 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (gsize)(tid)
55 #define MONO_UINT_TO_NATIVE_THREAD_ID(tid) (MonoNativeThreadId)(gsize)(tid)
57 #endif /* #ifdef HOST_WIN32 */
60 THREAD_INFO_TYPE is a way to make the mono-threads module parametric - or sort of.
61 The GC using mono-threads might extend the MonoThreadInfo struct to add its own
62 data, this avoid a pointer indirection on what is on a lot of hot paths.
64 But extending MonoThreadInfo has de disavantage that all functions here return type
65 would require a cast, something like the following:
73 ((MyThreadInfo*)mono_thread_info_current ())->stuff = 1;
75 While porting sgen to use mono-threads, the number of casts required was too much and
76 code ended up looking horrible. So we use this cute little hack. The idea is that
77 whomever is including this header can set the expected type to be used by functions here
78 and reduce the number of casts drastically.
81 #ifndef THREAD_INFO_TYPE
82 #define THREAD_INFO_TYPE MonoThreadInfo
86 STATE_STARTING = 0x00,
88 STATE_SHUTTING_DOWN = 0x02,
90 RUN_STATE_MASK = 0x0F,
92 STATE_SUSPENDED = 0x10,
93 STATE_SELF_SUSPENDED = 0x20,
94 SUSPEND_STATE_MASK = 0xF0,
98 * This enum tells which async thread service corresponds to which bit.
101 MONO_SERVICE_REQUEST_SAMPLE = 1,
105 MonoLinkedListSetNode node;
106 guint32 small_id; /*Used by hazard pointers */
107 MonoNativeThreadHandle native_handle; /* Valid on mach and android */
110 /*Tells if this thread was created by the runtime or not.*/
111 gboolean runtime_thread;
113 /* Tells if this thread should be ignored or not by runtime services such as GC and profiling */
114 gboolean tools_thread;
116 /* Max stack bounds, all valid addresses must be between [stack_start_limit, stack_end[ */
117 void *stack_start_limit, *stack_end;
119 /* suspend machinery, fields protected by suspend_semaphore */
120 MonoSemType suspend_semaphore;
123 MonoSemType finish_resume_semaphore;
124 MonoSemType resume_semaphore;
126 /* only needed by the posix backend */
127 #if (defined(_POSIX_VERSION) || defined(__native_client__)) && !defined (__MACH__)
128 MonoSemType begin_suspend_semaphore;
129 gboolean syscall_break_signal;
130 gboolean suspend_can_continue;
133 /*In theory, only the posix backend needs this, but having it on mach/win32 simplifies things a lot.*/
134 MonoThreadUnwindState suspend_state;
136 /*async call machinery, thread MUST be suspended before accessing those fields*/
137 void (*async_target)(void*);
141 If true, this thread is running a critical region of code and cannot be suspended.
142 A critical session is implicitly started when you call mono_thread_info_safe_suspend_sync
143 and is ended when you call either mono_thread_info_resume or mono_thread_info_finish_suspend.
145 gboolean inside_critical_region;
148 * If TRUE, the thread is in async context. Code can use this information to avoid async-unsafe
149 * operations like locking without having to pass an 'async' parameter around.
151 gboolean is_async_context;
153 gboolean create_suspended;
155 /* Semaphore used to implement CREATE_SUSPENDED */
156 MonoSemType create_suspended_sem;
159 * Values of TLS variables for this thread.
160 * This can be used to obtain the values of TLS variable for threads
161 * other than the current one.
163 gpointer tls [TLS_KEY_NUM];
165 /* IO layer handle for this thread */
166 /* Set when the thread is started, or in _wapi_thread_duplicate () */
169 /* Asynchronous service request. This flag is meant to be consumed by the multiplexing signal handlers to discover what sort of work they need to do.
170 * Use the mono_threads_add_async_job and mono_threads_consume_async_jobs APIs to modify this flag.
171 * In the future the signaling should be part of the API, but for now, it's only for massaging the bits.
173 volatile gint32 service_requests;
177 void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
179 This callback is called with @info still on the thread list.
180 This call is made while holding the suspend lock, so don't do callbacks.
181 SMR remains functional as its small_id has not been reclaimed.
183 void (*thread_unregister)(THREAD_INFO_TYPE *info);
185 This callback is called right before thread_unregister. This is called
186 without any locks held so it's the place for complicated cleanup.
188 The thread must remain operational between this call and thread_unregister.
189 It must be possible to successfully suspend it after thread_unregister completes.
191 void (*thread_detach)(THREAD_INFO_TYPE *info);
192 void (*thread_attach)(THREAD_INFO_TYPE *info);
193 gboolean (*mono_method_is_critical) (void *method);
194 gboolean (*mono_thread_in_critical_region) (THREAD_INFO_TYPE *info);
195 void (*thread_exit)(void *retval);
197 int (*mono_gc_pthread_create) (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
199 } MonoThreadInfoCallbacks;
202 void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
203 gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
204 gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoThreadInfo *info);
205 } MonoThreadInfoRuntimeCallbacks;
207 static inline gboolean
208 mono_threads_filter_tools_threads (THREAD_INFO_TYPE *info)
210 return !((MonoThreadInfo*)info)->tools_thread;
214 Requires the world to be stoped
216 #define FOREACH_THREAD(thread) MONO_LLS_FOREACH_FILTERED (mono_thread_info_list_head (), thread, mono_threads_filter_tools_threads, THREAD_INFO_TYPE*)
217 #define END_FOREACH_THREAD MONO_LLS_END_FOREACH
222 #define FOREACH_THREAD_SAFE(thread) MONO_LLS_FOREACH_FILTERED_SAFE (mono_thread_info_list_head (), thread, mono_threads_filter_tools_threads, THREAD_INFO_TYPE*)
223 #define END_FOREACH_THREAD_SAFE MONO_LLS_END_FOREACH_SAFE
225 #define mono_thread_info_get_tid(info) ((MonoNativeThreadId)((MonoThreadInfo*)info)->node.key)
226 #define mono_thread_info_set_tid(info, val) do { ((MonoThreadInfo*)(info))->node.key = (uintptr_t)(val); } while (0)
229 * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
230 * a single block with info from both camps.
233 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size);
236 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks);
238 MonoThreadInfoCallbacks *
239 mono_threads_get_callbacks (void);
241 MonoThreadInfoRuntimeCallbacks *
242 mono_threads_get_runtime_callbacks (void);
245 mono_thread_info_register_small_id (void);
248 mono_thread_info_attach (void *baseptr);
251 mono_thread_info_detach (void);
254 mono_thread_info_is_exiting (void);
257 mono_thread_info_current (void);
260 mono_thread_info_get_small_id (void);
263 mono_thread_info_list_head (void);
266 mono_thread_info_lookup (MonoNativeThreadId id);
269 mono_thread_info_safe_suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel);
272 mono_thread_info_resume (MonoNativeThreadId tid);
275 mono_thread_info_set_name (MonoNativeThreadId tid, const char *name);
278 mono_thread_info_finish_suspend (MonoThreadInfo *info);
281 mono_thread_info_finish_suspend_and_resume (MonoThreadInfo *info);
284 mono_thread_info_self_suspend (void);
287 mono_thread_info_new_interrupt_enabled (void);
290 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data);
293 mono_thread_info_suspend_lock (void);
296 mono_thread_info_suspend_unlock (void);
299 mono_thread_info_disable_new_interrupt (gboolean disable);
302 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid);
305 mono_thread_info_set_is_async_context (gboolean async_context);
308 mono_thread_info_is_async_context (void);
311 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize);
314 mono_thread_info_yield (void);
317 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key);
320 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value);
323 mono_thread_info_exit (void);
326 mono_thread_info_open_handle (void);
329 mono_thread_info_prepare_interrupt (HANDLE thread_handle);
332 mono_thread_info_finish_interrupt (gpointer wait_handle);
335 mono_thread_info_interrupt (HANDLE thread_handle);
338 mono_thread_info_self_interrupt (void);
341 mono_thread_info_clear_interruption (void);
344 mono_thread_info_is_live (THREAD_INFO_TYPE *info);
347 mono_threads_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid);
350 mono_threads_get_max_stack_size (void);
353 mono_threads_open_thread_handle (HANDLE handle, MonoNativeThreadId tid);
356 This is the async job submission/consumption API.
357 XXX: This is a PROVISIONAL API only meant to be used by the statistical profiler.
358 If you want to use/extend it anywhere else, understand that you'll have to do some API design work to better fit this puppy.
361 mono_threads_add_async_job (THREAD_INFO_TYPE *info, MonoAsyncJob job);
364 mono_threads_consume_async_jobs (void);
367 mono_threads_attach_tools_thread (void);
370 #if !defined(HOST_WIN32)
372 /*Use this instead of pthread_kill */
374 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum);
376 #endif /* !defined(HOST_WIN32) */
378 /* Plartform specific functions DON'T use them */
379 void mono_threads_init_platform (void); //ok
380 gboolean mono_threads_core_suspend (THREAD_INFO_TYPE *info, gboolean interrupt_kernel);
381 gboolean mono_threads_core_resume (THREAD_INFO_TYPE *info);
382 void mono_threads_platform_register (THREAD_INFO_TYPE *info); //ok
383 void mono_threads_platform_free (THREAD_INFO_TYPE *info);
384 void mono_threads_core_interrupt (THREAD_INFO_TYPE *info);
385 void mono_threads_core_abort_syscall (THREAD_INFO_TYPE *info);
386 gboolean mono_threads_core_needs_abort_syscall (void);
387 HANDLE mono_threads_core_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid);
388 void mono_threads_core_resume_created (THREAD_INFO_TYPE *info, MonoNativeThreadId tid);
389 void mono_threads_core_get_stack_bounds (guint8 **staddr, size_t *stsize);
390 gboolean mono_threads_core_yield (void);
391 void mono_threads_core_exit (int exit_code);
392 void mono_threads_core_unregister (THREAD_INFO_TYPE *info);
393 HANDLE mono_threads_core_open_handle (void);
394 HANDLE mono_threads_core_open_thread_handle (HANDLE handle, MonoNativeThreadId tid);
395 void mono_threads_core_set_name (MonoNativeThreadId tid, const char *name);
396 gpointer mono_threads_core_prepare_interrupt (HANDLE thread_handle);
397 void mono_threads_core_finish_interrupt (gpointer wait_handle);
398 void mono_threads_core_self_interrupt (void);
399 void mono_threads_core_clear_interruption (void);
401 MonoNativeThreadId mono_native_thread_id_get (void);
403 gboolean mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2);
406 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg);
408 /*Mach specific internals */
409 void mono_threads_init_dead_letter (void);
410 void mono_threads_install_dead_letter (void);
412 #endif /* __MONO_THREADS_H__ */