mono/utils/mono-threads-mach.c

   1 /**
   2  * \file
   3  * Low-level threading, mach version
   4  *
   5  * Author:
   6  *      Rodrigo Kumpera (kumpera@gmail.com)
   7  *
   8  * (C) 2011 Novell, Inc
   9  */
  10
  11 #include "config.h"
  12
  13 /* For pthread_main_np, pthread_get_stackaddr_np and pthread_get_stacksize_np */
  14 #if defined (__MACH__)
  15 #define _DARWIN_C_SOURCE 1
  16 #endif
  17
  18 #include <mono/utils/mono-threads.h>
  19 #include <mono/utils/mono-mmap.h>
  20
  21 #if defined (USE_MACH_BACKEND)
  22
  23 #include <mono/utils/mach-support.h>
  24 #include <mono/utils/mono-compiler.h>
  25 #include <mono/utils/mono-threads.h>
  26 #include <mono/utils/hazard-pointer.h>
  27 #include <mono/utils/mono-threads-debug.h>
  28
  29 void
  30 mono_threads_suspend_init (void)
  31 {
  32         mono_threads_init_dead_letter ();
  33 }
  34
  35 #if defined(HOST_WATCHOS) || defined(HOST_TVOS)
  36
  37 gboolean
  38 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  39 {
  40         g_assert_not_reached ();
  41 }
  42
  43 gboolean
  44 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
  45 {
  46         g_assert_not_reached ();
  47 }
  48
  49 gboolean
  50 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
  51 {
  52         g_assert_not_reached ();
  53 }
  54
  55 void
  56 mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
  57 {
  58 }
  59
  60 #else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
  61
  62 gboolean
  63 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  64 {
  65         kern_return_t ret;
  66
  67         g_assert (info);
  68
  69
  70         do {
  71                 ret = thread_suspend (info->native_handle);
  72         } while (ret == KERN_ABORTED);
  73
  74         THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  75         if (ret != KERN_SUCCESS)
  76                 return FALSE;
  77
  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                 do {
  82                         ret = thread_resume (info->native_handle);
  83                 } while (ret == KERN_ABORTED);
  84                 g_assert (ret == KERN_SUCCESS);
  85                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  86                 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
  87                 return TRUE;
  88         }
  89         info->suspend_can_continue = mono_threads_get_runtime_callbacks ()->
  90                 thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info);
  91         THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  92         if (info->suspend_can_continue) {
  93                 if (interrupt_kernel)
  94                         thread_abort (info->native_handle);
  95         } else {
  96                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  97         }
  98         return TRUE;
  99 }
 100
 101 gboolean
 102 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
 103 {
 104         return info->suspend_can_continue;
 105 }
 106
 107 gboolean
 108 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
 109 {
 110         kern_return_t ret;
 111
 112         if (info->async_target) {
 113                 MonoContext tmp = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].ctx;
 114                 mach_msg_type_number_t num_state, num_fpstate;
 115                 thread_state_t state, fpstate;
 116                 ucontext_t uctx;
 117                 mcontext_t mctx;
 118
 119                 mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp, info->async_target, info->user_data);
 120                 info->user_data = NULL;
 121                 info->async_target = (void (*)(void *)) info->user_data;
 122
 123                 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
 124                 fpstate = (thread_state_t) alloca (mono_mach_arch_get_thread_fpstate_size ());
 125                 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
 126
 127                 do {
 128                         ret = mono_mach_arch_get_thread_states (info->native_handle, state, &num_state, fpstate, &num_fpstate);
 129                 } while (ret == KERN_ABORTED);
 130
 131                 if (ret != KERN_SUCCESS)
 132                         return FALSE;
 133
 134                 mono_mach_arch_thread_states_to_mcontext (state, fpstate, mctx);
 135                 uctx.uc_mcontext = mctx;
 136                 mono_monoctx_to_sigctx (&tmp, &uctx);
 137
 138                 mono_mach_arch_mcontext_to_thread_states (mctx, state, fpstate);
 139
 140                 do {
 141                         ret = mono_mach_arch_set_thread_states (info->native_handle, state, num_state, fpstate, num_fpstate);
 142                 } while (ret == KERN_ABORTED);
 143
 144                 if (ret != KERN_SUCCESS)
 145                         return FALSE;
 146         }
 147
 148         do {
 149                 ret = thread_resume (info->native_handle);
 150         } while (ret == KERN_ABORTED);
 151         THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
 152
 153         return ret == KERN_SUCCESS;
 154 }
 155
 156 void
 157 mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
 158 {
 159         kern_return_t ret;
 160
 161         do {
 162                 ret = thread_suspend (info->native_handle);
 163         } while (ret == KERN_ABORTED);
 164
 165         if (ret != KERN_SUCCESS)
 166                 return;
 167
 168         do {
 169                 ret = thread_abort_safely (info->native_handle);
 170         } while (ret == KERN_ABORTED);
 171
 172         /*
 173          * We are doing thread_abort when thread_abort_safely returns KERN_SUCCESS because
 174          * for some reason accept is not interrupted by thread_abort_safely.
 175          * The risk of aborting non-atomic operations while calling thread_abort should not
 176          * exist because by the time thread_abort_safely returns KERN_SUCCESS the target
 177          * thread should have return from the kernel and should be waiting for thread_resume
 178          * to resume the user code.
 179          */
 180         if (ret == KERN_SUCCESS)
 181                 ret = thread_abort (info->native_handle);
 182
 183         do {
 184                 ret = thread_resume (info->native_handle);
 185         } while (ret == KERN_ABORTED);
 186
 187         g_assert (ret == KERN_SUCCESS);
 188 }
 189
 190 #endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
 191
 192 void
 193 mono_threads_suspend_register (MonoThreadInfo *info)
 194 {
 195         char thread_name [64];
 196
 197         info->native_handle = mach_thread_self ();
 198
 199         snprintf (thread_name, sizeof (thread_name), "tid_%x", (int) info->native_handle);
 200         pthread_setname_np (thread_name);
 201
 202         mono_threads_install_dead_letter ();
 203 }
 204
 205 void
 206 mono_threads_suspend_free (MonoThreadInfo *info)
 207 {
 208         mach_port_deallocate (current_task (), info->native_handle);
 209 }
 210
 211 void
 212 mono_threads_suspend_init_signals (void)
 213 {
 214 }
 215
 216 gint
 217 mono_threads_suspend_search_alternative_signal (void)
 218 {
 219         g_assert_not_reached ();
 220 }
 221
 222 gint
 223 mono_threads_suspend_get_suspend_signal (void)
 224 {
 225         return -1;
 226 }
 227
 228 gint
 229 mono_threads_suspend_get_restart_signal (void)
 230 {
 231         return -1;
 232 }
 233
 234 gint
 235 mono_threads_suspend_get_abort_signal (void)
 236 {
 237         return -1;
 238 }
 239
 240 #endif /* USE_MACH_BACKEND */
 241
 242 #ifdef __MACH__
 243 void
 244 mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize)
 245 {
 246         *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
 247         *stsize = pthread_get_stacksize_np (pthread_self());
 248
 249 #ifdef TARGET_OSX
 250         /*
 251          * Mavericks reports stack sizes as 512kb:
 252          * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
 253          * https://bugs.openjdk.java.net/browse/JDK-8020753
 254          */
 255         if (pthread_main_np () && *stsize == 512 * 1024)
 256                 *stsize = 2048 * mono_pagesize ();
 257 #endif
 258
 259         /* staddr points to the start of the stack, not the end */
 260         *staddr -= *stsize;
 261 }
 262
 263 #endif