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;
29 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (tid)
36 #include <mono/utils/mach-support.h>
38 typedef thread_port_t MonoNativeThreadHandle;
44 typedef pid_t MonoNativeThreadHandle;
46 #endif /* defined(__MACH__) */
48 typedef pthread_t MonoNativeThreadId;
50 typedef void* mono_native_thread_return_t;
52 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) GPOINTER_TO_UINT((tid))
54 #endif /* #ifdef HOST_WIN32 */
57 THREAD_INFO_TYPE is a way to make the mono-threads module parametric - or sort of.
58 The GC using mono-threads might extend the MonoThreadInfo struct to add its own
59 data, this avoid a pointer indirection on what is on a lot of hot paths.
61 But extending MonoThreadInfo has de disavantage that all functions here return type
62 would require a cast, something like the following:
70 ((MyThreadInfo*)mono_thread_info_current ())->stuff = 1;
72 While porting sgen to use mono-threads, the number of casts required was too much and
73 code ended up looking horrible. So we use this cute little hack. The idea is that
74 whomever is including this header can set the expected type to be used by functions here
75 and reduce the number of casts drastically.
78 #ifndef THREAD_INFO_TYPE
79 #define THREAD_INFO_TYPE MonoThreadInfo
83 STATE_STARTING = 0x00,
85 STATE_SHUTTING_DOWN = 0x02,
87 RUN_STATE_MASK = 0x0F,
89 STATE_SUSPENDED = 0x10,
90 STATE_SELF_SUSPENDED = 0x20,
91 SUSPEND_STATE_MASK = 0xF0,
94 #define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & RUN_STATE_MASK)
95 #define mono_thread_info_suspend_state(info) (((MonoThreadInfo*)info)->thread_state & SUSPEND_STATE_MASK)
98 MonoLinkedListSetNode node;
99 guint32 small_id; /*Used by hazard pointers */
100 MonoNativeThreadHandle native_handle; /* Valid on mach and android */
103 /*Tells if this thread was created by the runtime or not.*/
104 gboolean runtime_thread;
106 /* suspend machinery, fields protected by suspend_semaphore */
107 MonoSemType suspend_semaphore;
110 MonoSemType finish_resume_semaphore;
111 MonoSemType resume_semaphore;
113 /* only needed by the posix backend */
114 #if (defined(_POSIX_VERSION) || defined(__native_client__)) && !defined (__MACH__)
115 MonoSemType begin_suspend_semaphore;
116 gboolean syscall_break_signal;
117 gboolean suspend_can_continue;
120 /*In theory, only the posix backend needs this, but having it on mach/win32 simplifies things a lot.*/
121 MonoThreadUnwindState suspend_state;
123 /*async call machinery, thread MUST be suspended before accessing those fields*/
124 void (*async_target)(void*);
128 If true, this thread is running a critical region of code and cannot be suspended.
129 A critical session is implicitly started when you call mono_thread_info_safe_suspend_sync
130 and is ended when you call either mono_thread_info_resume or mono_thread_info_finish_suspend.
132 gboolean inside_critical_region;
135 * If TRUE, the thread is in async context. Code can use this information to avoid async-unsafe
136 * operations like locking without having to pass an 'async' parameter around.
138 gboolean is_async_context;
142 void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
144 This callback is called with @info still on the thread list.
145 This call is made while holding the suspend lock, so don't do callbacks.
146 SMR remains functional as its small_id has not been reclaimed.
148 void (*thread_unregister)(THREAD_INFO_TYPE *info);
150 This callback is called right before thread_unregister. This is called
151 without any locks held so it's the place for complicated cleanup.
153 The thread must remain operational between this call and thread_unregister.
154 It must be possible to successfully suspend it after thread_unregister completes.
156 void (*thread_detach)(THREAD_INFO_TYPE *info);
157 void (*thread_attach)(THREAD_INFO_TYPE *info);
158 gboolean (*mono_method_is_critical) (void *method);
160 int (*mono_gc_pthread_create) (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
162 } MonoThreadInfoCallbacks;
165 void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
166 gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
167 gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle);
168 } MonoThreadInfoRuntimeCallbacks;
171 Requires the world to be stoped
173 #define FOREACH_THREAD(thread) MONO_LLS_FOREACH (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
174 #define END_FOREACH_THREAD MONO_LLS_END_FOREACH
179 #define FOREACH_THREAD_SAFE(thread) MONO_LLS_FOREACH_SAFE (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
180 #define END_FOREACH_THREAD_SAFE MONO_LLS_END_FOREACH_SAFE
182 #define mono_thread_info_get_tid(info) ((MonoNativeThreadId)((MonoThreadInfo*)info)->node.key)
183 #define mono_thread_info_set_tid(info, val) do { ((MonoThreadInfo*)(info))->node.key = (uintptr_t)(val); } while (0)
186 * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
187 * a single block with info from both camps.
190 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size) MONO_INTERNAL;
193 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks) MONO_INTERNAL;
195 MonoThreadInfoCallbacks *
196 mono_threads_get_callbacks (void) MONO_INTERNAL;
198 MonoThreadInfoRuntimeCallbacks *
199 mono_threads_get_runtime_callbacks (void) MONO_INTERNAL;
202 mono_thread_info_register_small_id (void) MONO_INTERNAL;
205 mono_thread_info_attach (void *baseptr) MONO_INTERNAL;
208 mono_thread_info_dettach (void) MONO_INTERNAL;
211 mono_thread_info_current (void) MONO_INTERNAL;
214 mono_thread_info_get_small_id (void) MONO_INTERNAL;
217 mono_thread_info_list_head (void) MONO_INTERNAL;
220 mono_thread_info_lookup (MonoNativeThreadId id) MONO_INTERNAL;
223 mono_thread_info_safe_suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel) MONO_INTERNAL;
226 mono_thread_info_resume (MonoNativeThreadId tid) MONO_INTERNAL;
229 mono_thread_info_finish_suspend (void) MONO_INTERNAL;
232 mono_thread_info_self_suspend (void) MONO_INTERNAL;
235 mono_thread_info_new_interrupt_enabled (void) MONO_INTERNAL;
238 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data) MONO_INTERNAL;
241 mono_thread_info_suspend_lock (void) MONO_INTERNAL;
244 mono_thread_info_suspend_unlock (void) MONO_INTERNAL;
247 mono_thread_info_disable_new_interrupt (gboolean disable) MONO_INTERNAL;
250 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid) MONO_INTERNAL;
253 mono_thread_info_set_is_async_context (gboolean async_context) MONO_INTERNAL;
256 mono_thread_info_is_async_context (void) MONO_INTERNAL;
259 mono_threads_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid);
261 #if !defined(HOST_WIN32)
264 mono_threads_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg) MONO_INTERNAL;
266 #if !defined(__MACH__)
267 /*Use this instead of pthread_kill */
269 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum) MONO_INTERNAL;
272 #else /* !defined(HOST_WIN32) */
275 mono_threads_CreateThread (LPSECURITY_ATTRIBUTES attributes, SIZE_T stack_size, LPTHREAD_START_ROUTINE start_routine, LPVOID arg, DWORD creation_flags, LPDWORD thread_id);
278 #endif /* !defined(HOST_WIN32) */
280 /* Plartform specific functions DON'T use them */
281 void mono_threads_init_platform (void) MONO_INTERNAL; //ok
282 gboolean mono_threads_core_suspend (THREAD_INFO_TYPE *info) MONO_INTERNAL;
283 gboolean mono_threads_core_resume (THREAD_INFO_TYPE *info) MONO_INTERNAL;
284 void mono_threads_platform_register (THREAD_INFO_TYPE *info) MONO_INTERNAL; //ok
285 void mono_threads_platform_free (THREAD_INFO_TYPE *info) MONO_INTERNAL;
286 void mono_threads_core_interrupt (THREAD_INFO_TYPE *info) MONO_INTERNAL;
287 void mono_threads_core_abort_syscall (THREAD_INFO_TYPE *info) MONO_INTERNAL;
288 gboolean mono_threads_core_needs_abort_syscall (void) MONO_INTERNAL;
290 MonoNativeThreadId mono_native_thread_id_get (void) MONO_INTERNAL;
292 gboolean mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2) MONO_INTERNAL;
295 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg) MONO_INTERNAL;
297 #endif /* __MONO_THREADS_H__ */