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)
37 #include <mono/utils/mach-support.h>
39 typedef thread_port_t MonoNativeThreadHandle;
45 typedef pid_t MonoNativeThreadHandle;
47 #endif /* defined(__MACH__) */
49 typedef pthread_t MonoNativeThreadId;
51 typedef void* mono_native_thread_return_t;
53 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (gsize)(tid)
55 #endif /* #ifdef HOST_WIN32 */
58 THREAD_INFO_TYPE is a way to make the mono-threads module parametric - or sort of.
59 The GC using mono-threads might extend the MonoThreadInfo struct to add its own
60 data, this avoid a pointer indirection on what is on a lot of hot paths.
62 But extending MonoThreadInfo has de disavantage that all functions here return type
63 would require a cast, something like the following:
71 ((MyThreadInfo*)mono_thread_info_current ())->stuff = 1;
73 While porting sgen to use mono-threads, the number of casts required was too much and
74 code ended up looking horrible. So we use this cute little hack. The idea is that
75 whomever is including this header can set the expected type to be used by functions here
76 and reduce the number of casts drastically.
79 #ifndef THREAD_INFO_TYPE
80 #define THREAD_INFO_TYPE MonoThreadInfo
84 STATE_STARTING = 0x00,
86 STATE_SHUTTING_DOWN = 0x02,
88 RUN_STATE_MASK = 0x0F,
90 STATE_SUSPENDED = 0x10,
91 STATE_SELF_SUSPENDED = 0x20,
92 SUSPEND_STATE_MASK = 0xF0,
95 #define mono_thread_info_run_state(info) (((MonoThreadInfo*)info)->thread_state & RUN_STATE_MASK)
96 #define mono_thread_info_suspend_state(info) (((MonoThreadInfo*)info)->thread_state & SUSPEND_STATE_MASK)
99 MonoLinkedListSetNode node;
100 guint32 small_id; /*Used by hazard pointers */
101 MonoNativeThreadHandle native_handle; /* Valid on mach and android */
104 /*Tells if this thread was created by the runtime or not.*/
105 gboolean runtime_thread;
107 /* suspend machinery, fields protected by suspend_semaphore */
108 MonoSemType suspend_semaphore;
111 MonoSemType finish_resume_semaphore;
112 MonoSemType resume_semaphore;
114 /* only needed by the posix backend */
115 #if (defined(_POSIX_VERSION) || defined(__native_client__)) && !defined (__MACH__)
116 MonoSemType begin_suspend_semaphore;
117 gboolean syscall_break_signal;
118 gboolean suspend_can_continue;
121 /*In theory, only the posix backend needs this, but having it on mach/win32 simplifies things a lot.*/
122 MonoThreadUnwindState suspend_state;
124 /*async call machinery, thread MUST be suspended before accessing those fields*/
125 void (*async_target)(void*);
129 If true, this thread is running a critical region of code and cannot be suspended.
130 A critical session is implicitly started when you call mono_thread_info_safe_suspend_sync
131 and is ended when you call either mono_thread_info_resume or mono_thread_info_finish_suspend.
133 gboolean inside_critical_region;
136 * If TRUE, the thread is in async context. Code can use this information to avoid async-unsafe
137 * operations like locking without having to pass an 'async' parameter around.
139 gboolean is_async_context;
141 gboolean create_suspended;
143 /* Semaphore used to implement CREATE_SUSPENDED */
144 MonoSemType create_suspended_sem;
147 * Values of TLS variables for this thread.
148 * This can be used to obtain the values of TLS variable for threads
149 * other than the current one.
151 gpointer tls [TLS_KEY_NUM];
155 void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
157 This callback is called with @info still on the thread list.
158 This call is made while holding the suspend lock, so don't do callbacks.
159 SMR remains functional as its small_id has not been reclaimed.
161 void (*thread_unregister)(THREAD_INFO_TYPE *info);
163 This callback is called right before thread_unregister. This is called
164 without any locks held so it's the place for complicated cleanup.
166 The thread must remain operational between this call and thread_unregister.
167 It must be possible to successfully suspend it after thread_unregister completes.
169 void (*thread_detach)(THREAD_INFO_TYPE *info);
170 void (*thread_attach)(THREAD_INFO_TYPE *info);
171 gboolean (*mono_method_is_critical) (void *method);
173 int (*mono_gc_pthread_create) (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
175 } MonoThreadInfoCallbacks;
178 void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
179 gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
180 gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle);
181 } MonoThreadInfoRuntimeCallbacks;
184 Requires the world to be stoped
186 #define FOREACH_THREAD(thread) MONO_LLS_FOREACH (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
187 #define END_FOREACH_THREAD MONO_LLS_END_FOREACH
192 #define FOREACH_THREAD_SAFE(thread) MONO_LLS_FOREACH_SAFE (mono_thread_info_list_head (), thread, THREAD_INFO_TYPE*)
193 #define END_FOREACH_THREAD_SAFE MONO_LLS_END_FOREACH_SAFE
195 #define mono_thread_info_get_tid(info) ((MonoNativeThreadId)((MonoThreadInfo*)info)->node.key)
196 #define mono_thread_info_set_tid(info, val) do { ((MonoThreadInfo*)(info))->node.key = (uintptr_t)(val); } while (0)
199 * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
200 * a single block with info from both camps.
203 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size) MONO_INTERNAL;
206 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks) MONO_INTERNAL;
208 MonoThreadInfoCallbacks *
209 mono_threads_get_callbacks (void) MONO_INTERNAL;
211 MonoThreadInfoRuntimeCallbacks *
212 mono_threads_get_runtime_callbacks (void) MONO_INTERNAL;
215 mono_thread_info_register_small_id (void) MONO_INTERNAL;
218 mono_thread_info_attach (void *baseptr) MONO_INTERNAL;
221 mono_thread_info_dettach (void) MONO_INTERNAL;
224 mono_thread_info_current (void) MONO_INTERNAL;
227 mono_thread_info_get_small_id (void) MONO_INTERNAL;
230 mono_thread_info_list_head (void) MONO_INTERNAL;
233 mono_thread_info_lookup (MonoNativeThreadId id) MONO_INTERNAL;
236 mono_thread_info_safe_suspend_sync (MonoNativeThreadId tid, gboolean interrupt_kernel) MONO_INTERNAL;
239 mono_thread_info_resume (MonoNativeThreadId tid) MONO_INTERNAL;
242 mono_thread_info_finish_suspend (void) MONO_INTERNAL;
245 mono_thread_info_self_suspend (void) MONO_INTERNAL;
248 mono_thread_info_new_interrupt_enabled (void) MONO_INTERNAL;
251 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data) MONO_INTERNAL;
254 mono_thread_info_suspend_lock (void) MONO_INTERNAL;
257 mono_thread_info_suspend_unlock (void) MONO_INTERNAL;
260 mono_thread_info_disable_new_interrupt (gboolean disable) MONO_INTERNAL;
263 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid) MONO_INTERNAL;
266 mono_thread_info_set_is_async_context (gboolean async_context) MONO_INTERNAL;
269 mono_thread_info_is_async_context (void) MONO_INTERNAL;
272 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize);
275 mono_thread_info_yield (void) MONO_INTERNAL;
278 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key);
281 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value);
284 mono_threads_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid);
286 #if !defined(HOST_WIN32)
288 #if !defined(__MACH__)
289 /*Use this instead of pthread_kill */
291 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum) MONO_INTERNAL;
294 #endif /* !defined(HOST_WIN32) */
296 /* Plartform specific functions DON'T use them */
297 void mono_threads_init_platform (void) MONO_INTERNAL; //ok
298 gboolean mono_threads_core_suspend (THREAD_INFO_TYPE *info) MONO_INTERNAL;
299 gboolean mono_threads_core_resume (THREAD_INFO_TYPE *info) MONO_INTERNAL;
300 void mono_threads_platform_register (THREAD_INFO_TYPE *info) MONO_INTERNAL; //ok
301 void mono_threads_platform_free (THREAD_INFO_TYPE *info) MONO_INTERNAL;
302 void mono_threads_core_interrupt (THREAD_INFO_TYPE *info) MONO_INTERNAL;
303 void mono_threads_core_abort_syscall (THREAD_INFO_TYPE *info) MONO_INTERNAL;
304 gboolean mono_threads_core_needs_abort_syscall (void) MONO_INTERNAL;
305 HANDLE mono_threads_core_create_thread (LPTHREAD_START_ROUTINE start, gpointer arg, guint32 stack_size, guint32 creation_flags, MonoNativeThreadId *out_tid) MONO_INTERNAL;
306 void mono_threads_core_resume_created (THREAD_INFO_TYPE *info, MonoNativeThreadId tid) MONO_INTERNAL;
307 void mono_threads_core_get_stack_bounds (guint8 **staddr, size_t *stsize) MONO_INTERNAL;
308 gboolean mono_threads_core_yield (void) MONO_INTERNAL;
310 MonoNativeThreadId mono_native_thread_id_get (void) MONO_INTERNAL;
312 gboolean mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2) MONO_INTERNAL;
315 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg) MONO_INTERNAL;
317 #endif /* __MONO_THREADS_H__ */