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) (gsize)(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;
140 gboolean create_suspended;
142 /* Semaphore used to implement CREATE_SUSPENDED */
143 MonoSemType create_suspended_sem;
147 void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
149 This callback is called with @info still on the thread list.
150 This call is made while holding the suspend lock, so don't do callbacks.
151 SMR remains functional as its small_id has not been reclaimed.
153 void (*thread_unregister)(THREAD_INFO_TYPE *info);
155 This callback is called right before thread_unregister. This is called
156 without any locks held so it's the place for complicated cleanup.
158 The thread must remain operational between this call and thread_unregister.
159 It must be possible to successfully suspend it after thread_unregister completes.
161 void (*thread_detach)(THREAD_INFO_TYPE *info);
162 void (*thread_attach)(THREAD_INFO_TYPE *info);
163 gboolean (*mono_method_is_critical) (void *method);
165 int (*mono_gc_pthread_create) (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
167 } MonoThreadInfoCallbacks;
170 void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
171 gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
172 gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle);
173 } MonoThreadInfoRuntimeCallbacks;
176 Requires the world to be stoped
178 #define FOREACH_THREAD(thread) MONO_LLS_FOREACH (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
179 #define END_FOREACH_THREAD MONO_LLS_END_FOREACH
184 #define FOREACH_THREAD_SAFE(thread) MONO_LLS_FOREACH_SAFE (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
185 #define END_FOREACH_THREAD_SAFE MONO_LLS_END_FOREACH_SAFE
187 #define mono_thread_info_get_tid(info) ((MonoNativeThreadId)((MonoThreadInfo*)info)->node.key)
188 #define mono_thread_info_set_tid(info, val) do { ((MonoThreadInfo*)(info))->node.key = (uintptr_t)(val); } while (0)
191 * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
192 * a single block with info from both camps.
195 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size) MONO_INTERNAL;
198 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks) MONO_INTERNAL;
200 MonoThreadInfoCallbacks *
201 mono_threads_get_callbacks (void) MONO_INTERNAL;
203 MonoThreadInfoRuntimeCallbacks *
204 mono_threads_get_runtime_callbacks (void) MONO_INTERNAL;
207 mono_thread_info_register_small_id (void) MONO_INTERNAL;
210 mono_thread_info_attach (void *baseptr) MONO_INTERNAL;
213 mono_thread_info_dettach (void) MONO_INTERNAL;
216 mono_thread_info_current (void) MONO_INTERNAL;
219 mono_thread_info_get_small_id (void) MONO_INTERNAL;
222 mono_thread_info_list_head (void) MONO_INTERNAL;
225 mono_thread_info_lookup (MonoNativeThreadId id) MONO_INTERNAL;
228 mono_thread_info_safe_suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel) MONO_INTERNAL;
231 mono_thread_info_resume (MonoNativeThreadId tid) MONO_INTERNAL;
234 mono_thread_info_finish_suspend (void) MONO_INTERNAL;
237 mono_thread_info_self_suspend (void) MONO_INTERNAL;
240 mono_thread_info_new_interrupt_enabled (void) MONO_INTERNAL;
243 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data) MONO_INTERNAL;
246 mono_thread_info_suspend_lock (void) MONO_INTERNAL;
249 mono_thread_info_suspend_unlock (void) MONO_INTERNAL;
252 mono_thread_info_disable_new_interrupt (gboolean disable) MONO_INTERNAL;
255 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid) MONO_INTERNAL;
258 mono_thread_info_set_is_async_context (gboolean async_context) MONO_INTERNAL;
261 mono_thread_info_is_async_context (void) MONO_INTERNAL;
264 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize);
267 mono_threads_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid);
269 #if !defined(HOST_WIN32)
271 #if !defined(__MACH__)
272 /*Use this instead of pthread_kill */
274 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum) MONO_INTERNAL;
277 #endif /* !defined(HOST_WIN32) */
279 /* Plartform specific functions DON'T use them */
280 void mono_threads_init_platform (void) MONO_INTERNAL; //ok
281 gboolean mono_threads_core_suspend (THREAD_INFO_TYPE *info) MONO_INTERNAL;
282 gboolean mono_threads_core_resume (THREAD_INFO_TYPE *info) MONO_INTERNAL;
283 void mono_threads_platform_register (THREAD_INFO_TYPE *info) MONO_INTERNAL; //ok
284 void mono_threads_platform_free (THREAD_INFO_TYPE *info) MONO_INTERNAL;
285 void mono_threads_core_interrupt (THREAD_INFO_TYPE *info) MONO_INTERNAL;
286 void mono_threads_core_abort_syscall (THREAD_INFO_TYPE *info) MONO_INTERNAL;
287 gboolean mono_threads_core_needs_abort_syscall (void) MONO_INTERNAL;
288 HANDLE mono_threads_core_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid) MONO_INTERNAL;
289 void mono_threads_core_resume_created (THREAD_INFO_TYPE *info, MonoNativeThreadId tid) MONO_INTERNAL;
290 void mono_threads_core_get_stack_bounds (guint8 **staddr, size_t *stsize) MONO_INTERNAL;
292 MonoNativeThreadId mono_native_thread_id_get (void) MONO_INTERNAL;
294 gboolean mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2) MONO_INTERNAL;
297 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg) MONO_INTERNAL;
299 #endif /* __MONO_THREADS_H__ */