2 * mono-threads-mach.c: Low-level threading, mach version
5 * Rodrigo Kumpera (kumpera@gmail.com)
12 /* For pthread_main_np, pthread_get_stackaddr_np and pthread_get_stacksize_np */
13 #if defined (__MACH__)
14 #define _DARWIN_C_SOURCE 1
17 #include <mono/utils/mono-threads.h>
18 #include <mono/utils/mono-mmap.h>
20 #if defined (USE_MACH_BACKEND)
22 #include <mono/utils/mach-support.h>
23 #include <mono/utils/mono-compiler.h>
24 #include <mono/utils/mono-threads.h>
25 #include <mono/utils/hazard-pointer.h>
26 #include <mono/utils/mono-threads-debug.h>
29 mono_threads_suspend_init (void)
31 mono_threads_init_dead_letter ();
34 #if defined(HOST_WATCHOS) || defined(HOST_TVOS)
37 mono_threads_suspend_begin_async_suspend (MonoThreadInfo
*info
, gboolean interrupt_kernel
)
39 g_assert_not_reached ();
43 mono_threads_suspend_check_suspend_result (MonoThreadInfo
*info
)
45 g_assert_not_reached ();
49 mono_threads_suspend_begin_async_resume (MonoThreadInfo
*info
)
51 g_assert_not_reached ();
55 mono_threads_suspend_abort_syscall (MonoThreadInfo
*info
)
57 g_assert_not_reached ();
61 mono_threads_suspend_needs_abort_syscall (void)
66 #else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
69 mono_threads_suspend_begin_async_suspend (MonoThreadInfo
*info
, gboolean interrupt_kernel
)
77 ret
= thread_suspend (info
->native_handle
);
78 } while (ret
== KERN_ABORTED
);
80 THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer
)(gsize
)info
->native_handle
, ret
);
81 if (ret
!= KERN_SUCCESS
)
84 /* We're in the middle of a self-suspend, resume and register */
85 if (!mono_threads_transition_finish_async_suspend (info
)) {
86 mono_threads_add_to_pending_operation_set (info
);
88 ret
= thread_resume (info
->native_handle
);
89 } while (ret
== KERN_ABORTED
);
90 g_assert (ret
== KERN_SUCCESS
);
91 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (gpointer
)(gsize
)info
->native_handle
, 0);
92 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
95 info
->suspend_can_continue
= mono_threads_get_runtime_callbacks ()->
96 thread_state_init_from_handle (&info
->thread_saved_state
[ASYNC_SUSPEND_STATE_INDEX
], info
);
97 THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (gpointer
)(gsize
)info
->native_handle
, ret
);
98 if (info
->suspend_can_continue
) {
100 thread_abort (info
->native_handle
);
102 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer
)(gsize
)info
->native_handle
, 0);
108 mono_threads_suspend_check_suspend_result (MonoThreadInfo
*info
)
110 return info
->suspend_can_continue
;
114 mono_threads_suspend_begin_async_resume (MonoThreadInfo
*info
)
118 if (info
->async_target
) {
119 MonoContext tmp
= info
->thread_saved_state
[ASYNC_SUSPEND_STATE_INDEX
].ctx
;
120 mach_msg_type_number_t num_state
, num_fpstate
;
121 thread_state_t state
, fpstate
;
125 mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp
, info
->async_target
, info
->user_data
);
126 info
->user_data
= NULL
;
127 info
->async_target
= (void (*)(void *)) info
->user_data
;
129 state
= (thread_state_t
) alloca (mono_mach_arch_get_thread_state_size ());
130 fpstate
= (thread_state_t
) alloca (mono_mach_arch_get_thread_fpstate_size ());
131 mctx
= (mcontext_t
) alloca (mono_mach_arch_get_mcontext_size ());
134 ret
= mono_mach_arch_get_thread_states (info
->native_handle
, state
, &num_state
, fpstate
, &num_fpstate
);
135 } while (ret
== KERN_ABORTED
);
137 if (ret
!= KERN_SUCCESS
)
140 mono_mach_arch_thread_states_to_mcontext (state
, fpstate
, mctx
);
141 uctx
.uc_mcontext
= mctx
;
142 mono_monoctx_to_sigctx (&tmp
, &uctx
);
144 mono_mach_arch_mcontext_to_thread_states (mctx
, state
, fpstate
);
147 ret
= mono_mach_arch_set_thread_states (info
->native_handle
, state
, num_state
, fpstate
, num_fpstate
);
148 } while (ret
== KERN_ABORTED
);
150 if (ret
!= KERN_SUCCESS
)
155 ret
= thread_resume (info
->native_handle
);
156 } while (ret
== KERN_ABORTED
);
157 THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (gpointer
)(gsize
)info
->native_handle
, ret
);
159 return ret
== KERN_SUCCESS
;
163 mono_threads_suspend_abort_syscall (MonoThreadInfo
*info
)
168 ret
= thread_suspend (info
->native_handle
);
169 } while (ret
== KERN_ABORTED
);
171 if (ret
!= KERN_SUCCESS
)
175 ret
= thread_abort_safely (info
->native_handle
);
176 } while (ret
== KERN_ABORTED
);
179 * We are doing thread_abort when thread_abort_safely returns KERN_SUCCESS because
180 * for some reason accept is not interrupted by thread_abort_safely.
181 * The risk of aborting non-atomic operations while calling thread_abort should not
182 * exist because by the time thread_abort_safely returns KERN_SUCCESS the target
183 * thread should have return from the kernel and should be waiting for thread_resume
184 * to resume the user code.
186 if (ret
== KERN_SUCCESS
)
187 ret
= thread_abort (info
->native_handle
);
190 ret
= thread_resume (info
->native_handle
);
191 } while (ret
== KERN_ABORTED
);
193 g_assert (ret
== KERN_SUCCESS
);
197 mono_threads_suspend_needs_abort_syscall (void)
202 #endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
205 mono_threads_suspend_register (MonoThreadInfo
*info
)
207 char thread_name
[64];
209 info
->native_handle
= mach_thread_self ();
211 snprintf (thread_name
, sizeof (thread_name
), "tid_%x", (int) info
->native_handle
);
212 pthread_setname_np (thread_name
);
214 mono_threads_install_dead_letter ();
218 mono_threads_suspend_free (MonoThreadInfo
*info
)
220 mach_port_deallocate (current_task (), info
->native_handle
);
224 mono_threads_suspend_init_signals (void)
229 mono_threads_suspend_search_alternative_signal (void)
231 g_assert_not_reached ();
235 mono_threads_suspend_get_suspend_signal (void)
241 mono_threads_suspend_get_restart_signal (void)
247 mono_threads_suspend_get_abort_signal (void)
252 #endif /* USE_MACH_BACKEND */
256 mono_threads_platform_get_stack_bounds (guint8
**staddr
, size_t *stsize
)
258 *staddr
= (guint8
*)pthread_get_stackaddr_np (pthread_self());
259 *stsize
= pthread_get_stacksize_np (pthread_self());
263 * Mavericks reports stack sizes as 512kb:
264 * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
265 * https://bugs.openjdk.java.net/browse/JDK-8020753
267 if (pthread_main_np () && *stsize
== 512 * 1024)
268 *stsize
= 2048 * mono_pagesize ();
271 /* staddr points to the start of the stack, not the end */