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>
24 typedef DWORD MonoNativeThreadId;
25 typedef HANDLE MonoNativeThreadHandle; /* unused */
27 typedef DWORD mono_native_thread_return_t;
34 #include <mono/utils/mach-support.h>
36 typedef thread_port_t MonoNativeThreadHandle;
42 typedef pid_t MonoNativeThreadHandle;
44 #endif /* defined(__MACH__) */
46 typedef pthread_t MonoNativeThreadId;
48 typedef void* mono_native_thread_return_t;
50 #endif /* #ifdef HOST_WIN32 */
53 THREAD_INFO_TYPE is a way to make the mono-threads module parametric - or sort of.
54 The GC using mono-threads might extend the MonoThreadInfo struct to add its own
55 data, this avoid a pointer indirection on what is on a lot of hot paths.
57 But extending MonoThreadInfo has de disavantage that all functions here return type
58 would require a cast, something like the following:
66 ((MyThreadInfo*)mono_thread_info_current ())->stuff = 1;
68 While porting sgen to use mono-threads, the number of casts required was too much and
69 code ended up looking horrible. So we use this cute little hack. The idea is that
70 whomever is including this header can set the expected type to be used by functions here
71 and reduce the number of casts drastically.
74 #ifndef THREAD_INFO_TYPE
75 #define THREAD_INFO_TYPE MonoThreadInfo
79 STATE_STARTING = 0x00,
81 STATE_SHUTTING_DOWN = 0x02,
83 RUN_STATE_MASK = 0x0F,
85 STATE_SUSPENDED = 0x10,
86 STATE_SELF_SUSPENDED = 0x20,
87 SUSPEND_STATE_MASK = 0xF0,
90 #define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & RUN_STATE_MASK)
91 #define mono_thread_info_suspend_state(info) (((MonoThreadInfo*)info)->thread_state & SUSPEND_STATE_MASK)
94 MonoLinkedListSetNode node;
95 guint32 small_id; /*Used by hazard pointers */
96 MonoNativeThreadHandle native_handle; /* Valid on mach and android */
99 /*Tells if this thread was created by the runtime or not.*/
100 gboolean runtime_thread;
102 /* suspend machinery, fields protected by suspend_semaphore */
103 MonoSemType suspend_semaphore;
106 MonoSemType finish_resume_semaphore;
107 MonoSemType resume_semaphore;
109 /* only needed by the posix backend */
110 #if (defined(_POSIX_VERSION) || defined(__native_client__)) && !defined (__MACH__)
111 MonoSemType begin_suspend_semaphore;
112 gboolean syscall_break_signal;
113 gboolean suspend_can_continue;
116 /*In theory, only the posix backend needs this, but having it on mach/win32 simplifies things a lot.*/
117 MonoThreadUnwindState suspend_state;
119 /*async call machinery, thread MUST be suspended before accessing those fields*/
120 void (*async_target)(void*);
124 If true, this thread is running a critical region of code and cannot be suspended.
125 A critical session is implicitly started when you call mono_thread_info_safe_suspend_sync
126 and is ended when you call either mono_thread_info_resume or mono_thread_info_finish_suspend.
128 gboolean inside_critical_region;
131 * If TRUE, the thread is in async context. Code can use this information to avoid async-unsafe
132 * operations like locking without having to pass an 'async' parameter around.
134 gboolean is_async_context;
138 void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
140 This callback is called with @info still on the thread list.
141 This call is made while holding the suspend lock, so don't do callbacks.
142 SMR remains functional as its small_id has not been reclaimed.
144 void (*thread_unregister)(THREAD_INFO_TYPE *info);
146 This callback is called right before thread_unregister. This is called
147 without any locks held so it's the place for complicated cleanup.
149 The thread must remain operational between this call and thread_unregister.
150 It must be possible to successfully suspend it after thread_unregister completes.
152 void (*thread_detach)(THREAD_INFO_TYPE *info);
153 void (*thread_attach)(THREAD_INFO_TYPE *info);
154 gboolean (*mono_method_is_critical) (void *method);
156 int (*mono_gc_pthread_create) (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
158 } MonoThreadInfoCallbacks;
161 void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
162 gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
163 gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle);
164 } MonoThreadInfoRuntimeCallbacks;
167 Requires the world to be stoped
169 #define FOREACH_THREAD(thread) MONO_LLS_FOREACH (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
170 #define END_FOREACH_THREAD MONO_LLS_END_FOREACH
175 #define FOREACH_THREAD_SAFE(thread) MONO_LLS_FOREACH_SAFE (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
176 #define END_FOREACH_THREAD_SAFE MONO_LLS_END_FOREACH_SAFE
178 #define mono_thread_info_get_tid(info) ((MonoNativeThreadId)((MonoThreadInfo*)info)->node.key)
179 #define mono_thread_info_set_tid(info, val) do { ((MonoThreadInfo*)(info))->node.key = (uintptr_t)(val); } while (0)
182 * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
183 * a single block with info from both camps.
186 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size) MONO_INTERNAL;
189 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks) MONO_INTERNAL;
191 MonoThreadInfoCallbacks *
192 mono_threads_get_callbacks (void) MONO_INTERNAL;
194 MonoThreadInfoRuntimeCallbacks *
195 mono_threads_get_runtime_callbacks (void) MONO_INTERNAL;
198 mono_thread_info_register_small_id (void) MONO_INTERNAL;
201 mono_thread_info_attach (void *baseptr) MONO_INTERNAL;
204 mono_thread_info_dettach (void) MONO_INTERNAL;
207 mono_thread_info_current (void) MONO_INTERNAL;
210 mono_thread_info_get_small_id (void) MONO_INTERNAL;
213 mono_thread_info_list_head (void) MONO_INTERNAL;
216 mono_thread_info_lookup (MonoNativeThreadId id) MONO_INTERNAL;
219 mono_thread_info_safe_suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel) MONO_INTERNAL;
222 mono_thread_info_resume (MonoNativeThreadId tid) MONO_INTERNAL;
225 mono_thread_info_finish_suspend (void) MONO_INTERNAL;
228 mono_thread_info_self_suspend (void) MONO_INTERNAL;
231 mono_thread_info_new_interrupt_enabled (void) MONO_INTERNAL;
234 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data) MONO_INTERNAL;
237 mono_thread_info_suspend_lock (void) MONO_INTERNAL;
240 mono_thread_info_suspend_unlock (void) MONO_INTERNAL;
243 mono_thread_info_disable_new_interrupt (gboolean disable) MONO_INTERNAL;
246 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid) MONO_INTERNAL;
249 mono_thread_info_set_is_async_context (gboolean async_context) MONO_INTERNAL;
252 mono_thread_info_is_async_context (void) MONO_INTERNAL;
254 #if !defined(HOST_WIN32)
257 mono_threads_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg) MONO_INTERNAL;
259 #if !defined(__MACH__)
260 /*Use this instead of pthread_kill */
262 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum) MONO_INTERNAL;
265 #else /* !defined(HOST_WIN32) */
268 mono_threads_CreateThread (LPSECURITY_ATTRIBUTES attributes, SIZE_T stack_size, LPTHREAD_START_ROUTINE start_routine, LPVOID arg, DWORD creation_flags, LPDWORD thread_id);
271 #endif /* !defined(HOST_WIN32) */
273 /* Plartform specific functions DON'T use them */
274 void mono_threads_init_platform (void) MONO_INTERNAL; //ok
275 gboolean mono_threads_core_suspend (THREAD_INFO_TYPE *info) MONO_INTERNAL;
276 gboolean mono_threads_core_resume (THREAD_INFO_TYPE *info) MONO_INTERNAL;
277 void mono_threads_platform_register (THREAD_INFO_TYPE *info) MONO_INTERNAL; //ok
278 void mono_threads_platform_free (THREAD_INFO_TYPE *info) MONO_INTERNAL;
279 void mono_threads_core_interrupt (THREAD_INFO_TYPE *info) MONO_INTERNAL;
280 void mono_threads_core_abort_syscall (THREAD_INFO_TYPE *info) MONO_INTERNAL;
281 gboolean mono_threads_core_needs_abort_syscall (void) MONO_INTERNAL;
283 MonoNativeThreadId mono_native_thread_id_get (void) MONO_INTERNAL;
285 gboolean mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2) MONO_INTERNAL;
288 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg) MONO_INTERNAL;
290 #endif /* __MONO_THREADS_H__ */