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 }
  58
  59 #else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
  60
  61 gboolean
  62 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  63 {
  64         kern_return_t ret;
  65
  66         g_assert (info);
  67
  68
  69         do {
  70                 ret = thread_suspend (info->native_handle);
  71         } while (ret == KERN_ABORTED);
  72
  73         THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  74         if (ret != KERN_SUCCESS)
  75                 return FALSE;
  76
  77         /* We're in the middle of a self-suspend, resume and register */
  78         if (!mono_threads_transition_finish_async_suspend (info)) {
  79                 mono_threads_add_to_pending_operation_set (info);
  80                 do {
  81                         ret = thread_resume (info->native_handle);
  82                 } while (ret == KERN_ABORTED);
  83                 g_assert (ret == KERN_SUCCESS);
  84                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  85                 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
  86                 return TRUE;
  87         }
  88         info->suspend_can_continue = mono_threads_get_runtime_callbacks ()->
  89                 thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info);
  90         THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  91         if (info->suspend_can_continue) {
  92                 if (interrupt_kernel)
  93                         thread_abort (info->native_handle);
  94         } else {
  95                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  96         }
  97         return TRUE;
  98 }
  99
 100 gboolean
 101 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
 102 {
 103         return info->suspend_can_continue;
 104 }
 105
 106 gboolean
 107 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
 108 {
 109         kern_return_t ret;
 110
 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, num_fpstate;
 114                 thread_state_t state, fpstate;
 115                 ucontext_t uctx;
 116                 mcontext_t mctx;
 117
 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;
 121
 122                 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
 123                 fpstate = (thread_state_t) alloca (mono_mach_arch_get_thread_fpstate_size ());
 124                 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
 125
 126                 do {
 127                         ret = mono_mach_arch_get_thread_states (info->native_handle, state, &num_state, fpstate, &num_fpstate);
 128                 } while (ret == KERN_ABORTED);
 129
 130                 if (ret != KERN_SUCCESS)
 131                         return FALSE;
 132
 133                 mono_mach_arch_thread_states_to_mcontext (state, fpstate, mctx);
 134                 uctx.uc_mcontext = mctx;
 135                 mono_monoctx_to_sigctx (&tmp, &uctx);
 136
 137                 mono_mach_arch_mcontext_to_thread_states (mctx, state, fpstate);
 138
 139                 do {
 140                         ret = mono_mach_arch_set_thread_states (info->native_handle, state, num_state, fpstate, num_fpstate);
 141                 } while (ret == KERN_ABORTED);
 142
 143                 if (ret != KERN_SUCCESS)
 144                         return FALSE;
 145         }
 146
 147         do {
 148                 ret = thread_resume (info->native_handle);
 149         } while (ret == KERN_ABORTED);
 150         THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
 151
 152         return ret == KERN_SUCCESS;
 153 }
 154
 155 void
 156 mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
 157 {
 158         kern_return_t ret;
 159
 160         do {
 161                 ret = thread_suspend (info->native_handle);
 162         } while (ret == KERN_ABORTED);
 163
 164         if (ret != KERN_SUCCESS)
 165                 return;
 166
 167         do {
 168                 ret = thread_abort_safely (info->native_handle);
 169         } while (ret == KERN_ABORTED);
 170
 171         /*
 172          * We are doing thread_abort when thread_abort_safely returns KERN_SUCCESS because
 173          * for some reason accept is not interrupted by thread_abort_safely.
 174          * The risk of aborting non-atomic operations while calling thread_abort should not
 175          * exist because by the time thread_abort_safely returns KERN_SUCCESS the target
 176          * thread should have return from the kernel and should be waiting for thread_resume
 177          * to resume the user code.
 178          */
 179         if (ret == KERN_SUCCESS)
 180                 ret = thread_abort (info->native_handle);
 181
 182         do {
 183                 ret = thread_resume (info->native_handle);
 184         } while (ret == KERN_ABORTED);
 185
 186         g_assert (ret == KERN_SUCCESS);
 187 }
 188
 189 #endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
 190
 191 void
 192 mono_threads_suspend_register (MonoThreadInfo *info)
 193 {
 194         char thread_name [64];
 195
 196         info->native_handle = mach_thread_self ();
 197
 198         snprintf (thread_name, sizeof (thread_name), "tid_%x", (int) info->native_handle);
 199         pthread_setname_np (thread_name);
 200
 201         mono_threads_install_dead_letter ();
 202 }
 203
 204 void
 205 mono_threads_suspend_free (MonoThreadInfo *info)
 206 {
 207         mach_port_deallocate (current_task (), info->native_handle);
 208 }
 209
 210 void
 211 mono_threads_suspend_init_signals (void)
 212 {
 213 }
 214
 215 gint
 216 mono_threads_suspend_search_alternative_signal (void)
 217 {
 218         g_assert_not_reached ();
 219 }
 220
 221 gint
 222 mono_threads_suspend_get_suspend_signal (void)
 223 {
 224         return -1;
 225 }
 226
 227 gint
 228 mono_threads_suspend_get_restart_signal (void)
 229 {
 230         return -1;
 231 }
 232
 233 gint
 234 mono_threads_suspend_get_abort_signal (void)
 235 {
 236         return -1;
 237 }
 238
 239 #endif /* USE_MACH_BACKEND */
 240
 241 #ifdef __MACH__
 242 void
 243 mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize)
 244 {
 245         *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
 246         *stsize = pthread_get_stacksize_np (pthread_self());
 247
 248 #ifdef TARGET_OSX
 249         /*
 250          * Mavericks reports stack sizes as 512kb:
 251          * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
 252          * https://bugs.openjdk.java.net/browse/JDK-8020753
 253          */
 254         if (pthread_main_np () && *stsize == 512 * 1024)
 255                 *stsize = 2048 * mono_pagesize ();
 256 #endif
 257
 258         /* staddr points to the start of the stack, not the end */
 259         *staddr -= *stsize;
 260 }
 261
 262 #endif