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-semaphore.h>
25 #include <mono/utils/mono-threads.h>
26 #include <mono/utils/hazard-pointer.h>
29 mono_threads_init_platform (void)
31 mono_threads_init_dead_letter ();
35 mono_threads_core_abort_syscall (MonoThreadInfo *info)
39 ret = thread_suspend (info->native_handle);
40 if (ret != KERN_SUCCESS)
43 ret = thread_abort_safely (info->native_handle);
46 * We are doing thread_abort when thread_abort_safely returns KERN_SUCCESS because
47 * for some reason accept is not interrupted by thread_abort_safely.
48 * The risk of aborting non-atomic operations while calling thread_abort should not
49 * exist because by the time thread_abort_safely returns KERN_SUCCESS the target
50 * thread should have return from the kernel and should be waiting for thread_resume
51 * to resume the user code.
53 if (ret == KERN_SUCCESS)
54 ret = thread_abort (info->native_handle);
56 g_assert (thread_resume (info->native_handle) == KERN_SUCCESS);
60 mono_threads_core_needs_abort_syscall (void)
66 mono_threads_core_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
73 ret = thread_suspend (info->native_handle);
74 THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (void*)info->native_handle, ret);
75 if (ret != KERN_SUCCESS)
78 /* We're in the middle of a self-suspend, resume and register */
79 if (!mono_threads_transition_finish_async_suspend (info)) {
80 mono_threads_add_to_pending_operation_set (info);
81 g_assert (thread_resume (info->native_handle) == KERN_SUCCESS);
82 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (void*)info->native_handle, 0);
83 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
86 res = mono_threads_get_runtime_callbacks ()->
87 thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info);
88 THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (void*)info->native_handle, res);
91 thread_abort (info->native_handle);
93 mono_threads_transition_async_suspend_compensation (info);
94 g_assert (thread_resume (info->native_handle) == KERN_SUCCESS);
95 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (void*)info->native_handle, 0);
101 mono_threads_core_check_suspend_result (MonoThreadInfo *info)
107 mono_threads_core_begin_async_resume (MonoThreadInfo *info)
111 if (info->async_target) {
112 MonoContext tmp = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].ctx;
113 mach_msg_type_number_t num_state;
114 thread_state_t state;
118 mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp, info->async_target, info->user_data);
119 info->user_data = NULL;
120 info->async_target = (void (*)(void *)) info->user_data;
122 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
123 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
125 ret = mono_mach_arch_get_thread_state (info->native_handle, state, &num_state);
126 if (ret != KERN_SUCCESS)
129 mono_mach_arch_thread_state_to_mcontext (state, mctx);
131 g_assert_not_reached ();
133 uctx.uc_mcontext = mctx;
135 mono_monoctx_to_sigctx (&tmp, &uctx);
137 mono_mach_arch_mcontext_to_thread_state (mctx, state);
139 ret = mono_mach_arch_set_thread_state (info->native_handle, state, num_state);
140 if (ret != KERN_SUCCESS)
144 ret = thread_resume (info->native_handle);
145 THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (void*)info->native_handle, ret);
147 return ret == KERN_SUCCESS;
151 mono_threads_platform_register (MonoThreadInfo *info)
153 info->native_handle = mach_thread_self ();
154 mono_threads_install_dead_letter ();
158 mono_threads_platform_free (MonoThreadInfo *info)
160 mach_port_deallocate (current_task (), info->native_handle);
164 mono_threads_core_begin_global_suspend (void)
169 mono_threads_core_end_global_suspend (void)
173 #endif /* USE_MACH_BACKEND */
177 mono_threads_core_get_stack_bounds (guint8 **staddr, size_t *stsize)
179 *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
180 *stsize = pthread_get_stacksize_np (pthread_self());
184 * Mavericks reports stack sizes as 512kb:
185 * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
186 * https://bugs.openjdk.java.net/browse/JDK-8020753
188 if (pthread_main_np () && *stsize == 512 * 1024)
189 *stsize = 2048 * mono_pagesize ();
192 /* staddr points to the start of the stack, not the end */