mono/utils/mono-threads-mach.c

   1 /*
   2  * mono-threads-mach.c: Low-level threading, mach version
   3  *
   4  * Author:
   5  *      Rodrigo Kumpera (kumpera@gmail.com)
   6  *
   7  * (C) 2011 Novell, Inc
   8  */
   9
  10 #include "config.h"
  11
  12 /* For pthread_main_np, pthread_get_stackaddr_np and pthread_get_stacksize_np */
  13 #if defined (__MACH__)
  14 #define _DARWIN_C_SOURCE 1
  15 #endif
  16
  17 #include <mono/utils/mono-threads.h>
  18 #include <mono/utils/mono-mmap.h>
  19
  20 #if defined (USE_MACH_BACKEND)
  21
  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>
  27
  28 void
  29 mono_threads_suspend_init (void)
  30 {
  31         mono_threads_init_dead_letter ();
  32 }
  33
  34 #if defined(HOST_WATCHOS) || defined(HOST_TVOS)
  35
  36 gboolean
  37 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  38 {
  39         g_assert_not_reached ();
  40 }
  41
  42 gboolean
  43 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
  44 {
  45         g_assert_not_reached ();
  46 }
  47
  48 gboolean
  49 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
  50 {
  51         g_assert_not_reached ();
  52 }
  53
  54 void
  55 mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
  56 {
  57         g_assert_not_reached ();
  58 }
  59
  60 gboolean
  61 mono_threads_suspend_needs_abort_syscall (void)
  62 {
  63         return FALSE;
  64 }
  65
  66 #else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
  67
  68 gboolean
  69 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  70 {
  71         kern_return_t ret;
  72
  73         g_assert (info);
  74
  75
  76         do {
  77                 ret = thread_suspend (info->native_handle);
  78         } while (ret == KERN_ABORTED);
  79
  80         THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  81         if (ret != KERN_SUCCESS)
  82                 return FALSE;
  83
  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);
  87                 do {
  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
  93                 return TRUE;
  94         }
  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) {
  99                 if (interrupt_kernel)
 100                         thread_abort (info->native_handle);
 101         } else {
 102                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
 103         }
 104         return TRUE;
 105 }
 106
 107 gboolean
 108 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
 109 {
 110         return info->suspend_can_continue;
 111 }
 112
 113 gboolean
 114 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
 115 {
 116         kern_return_t ret;
 117
 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;
 122                 ucontext_t uctx;
 123                 mcontext_t mctx;
 124
 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;
 128
 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 ());
 132
 133                 do {
 134                         ret = mono_mach_arch_get_thread_states (info->native_handle, state, &num_state, fpstate, &num_fpstate);
 135                 } while (ret == KERN_ABORTED);
 136
 137                 if (ret != KERN_SUCCESS)
 138                         return FALSE;
 139
 140                 mono_mach_arch_thread_states_to_mcontext (state, fpstate, mctx);
 141                 uctx.uc_mcontext = mctx;
 142                 mono_monoctx_to_sigctx (&tmp, &uctx);
 143
 144                 mono_mach_arch_mcontext_to_thread_states (mctx, state, fpstate);
 145
 146                 do {
 147                         ret = mono_mach_arch_set_thread_states (info->native_handle, state, num_state, fpstate, num_fpstate);
 148                 } while (ret == KERN_ABORTED);
 149
 150                 if (ret != KERN_SUCCESS)
 151                         return FALSE;
 152         }
 153
 154         do {
 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);
 158
 159         return ret == KERN_SUCCESS;
 160 }
 161
 162 void
 163 mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
 164 {
 165         kern_return_t ret;
 166
 167         do {
 168                 ret = thread_suspend (info->native_handle);
 169         } while (ret == KERN_ABORTED);
 170
 171         if (ret != KERN_SUCCESS)
 172                 return;
 173
 174         do {
 175                 ret = thread_abort_safely (info->native_handle);
 176         } while (ret == KERN_ABORTED);
 177
 178         /*
 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.
 185          */
 186         if (ret == KERN_SUCCESS)
 187                 ret = thread_abort (info->native_handle);
 188
 189         do {
 190                 ret = thread_resume (info->native_handle);
 191         } while (ret == KERN_ABORTED);
 192
 193         g_assert (ret == KERN_SUCCESS);
 194 }
 195
 196 gboolean
 197 mono_threads_suspend_needs_abort_syscall (void)
 198 {
 199         return TRUE;
 200 }
 201
 202 #endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
 203
 204 void
 205 mono_threads_suspend_register (MonoThreadInfo *info)
 206 {
 207         char thread_name [64];
 208
 209         info->native_handle = mach_thread_self ();
 210
 211         snprintf (thread_name, sizeof (thread_name), "tid_%x", (int) info->native_handle);
 212         pthread_setname_np (thread_name);
 213
 214         mono_threads_install_dead_letter ();
 215 }
 216
 217 void
 218 mono_threads_suspend_free (MonoThreadInfo *info)
 219 {
 220         mach_port_deallocate (current_task (), info->native_handle);
 221 }
 222
 223 void
 224 mono_threads_suspend_init_signals (void)
 225 {
 226 }
 227
 228 gint
 229 mono_threads_suspend_search_alternative_signal (void)
 230 {
 231         g_assert_not_reached ();
 232 }
 233
 234 gint
 235 mono_threads_suspend_get_suspend_signal (void)
 236 {
 237         return -1;
 238 }
 239
 240 gint
 241 mono_threads_suspend_get_restart_signal (void)
 242 {
 243         return -1;
 244 }
 245
 246 gint
 247 mono_threads_suspend_get_abort_signal (void)
 248 {
 249         return -1;
 250 }
 251
 252 #endif /* USE_MACH_BACKEND */
 253
 254 #ifdef __MACH__
 255 void
 256 mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize)
 257 {
 258         *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
 259         *stsize = pthread_get_stacksize_np (pthread_self());
 260
 261 #ifdef TARGET_OSX
 262         /*
 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
 266          */
 267         if (pthread_main_np () && *stsize == 512 * 1024)
 268                 *stsize = 2048 * mono_pagesize ();
 269 #endif
 270
 271         /* staddr points to the start of the stack, not the end */
 272         *staddr -= *stsize;
 273 }
 274
 275 #endif