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
  27 void
  28 mono_threads_suspend_init (void)
  29 {
  30         mono_threads_init_dead_letter ();
  31 }
  32
  33 #if defined(HOST_WATCHOS) || defined(HOST_TVOS)
  34
  35 gboolean
  36 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  37 {
  38         g_assert_not_reached ();
  39 }
  40
  41 gboolean
  42 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
  43 {
  44         g_assert_not_reached ();
  45 }
  46
  47 gboolean
  48 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
  49 {
  50         g_assert_not_reached ();
  51 }
  52
  53 #else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
  54
  55 gboolean
  56 mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  57 {
  58         kern_return_t ret;
  59
  60         g_assert (info);
  61
  62
  63         do {
  64                 ret = thread_suspend (info->native_handle);
  65         } while (ret == KERN_ABORTED);
  66
  67         THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
  68         if (ret != KERN_SUCCESS)
  69                 return FALSE;
  70
  71         /* We're in the middle of a self-suspend, resume and register */
  72         if (!mono_threads_transition_finish_async_suspend (info)) {
  73                 mono_threads_add_to_pending_operation_set (info);
  74                 do {
  75                         ret = thread_resume (info->native_handle);
  76                 } while (ret == KERN_ABORTED);
  77                 g_assert (ret == KERN_SUCCESS);
  78                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  79                 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
  80                 return TRUE;
  81         }
  82         info->suspend_can_continue = mono_threads_get_runtime_callbacks ()->
  83                 thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info);
  84         THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (gpointer)(gsize)info->native_handle, res);
  85         if (info->suspend_can_continue) {
  86                 if (interrupt_kernel)
  87                         thread_abort (info->native_handle);
  88         } else {
  89                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
  90         }
  91         return info->suspend_can_continue;
  92 }
  93
  94 gboolean
  95 mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
  96 {
  97         return info->suspend_can_continue;
  98 }
  99
 100 gboolean
 101 mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
 102 {
 103         kern_return_t ret;
 104
 105         if (info->async_target) {
 106                 MonoContext tmp = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].ctx;
 107                 mach_msg_type_number_t num_state;
 108                 thread_state_t state;
 109                 ucontext_t uctx;
 110                 mcontext_t mctx;
 111
 112                 mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp, info->async_target, info->user_data);
 113                 info->user_data = NULL;
 114                 info->async_target = (void (*)(void *)) info->user_data;
 115
 116                 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
 117                 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
 118
 119                 do {
 120                         ret = mono_mach_arch_get_thread_state (info->native_handle, state, &num_state);
 121                 } while (ret == KERN_ABORTED);
 122
 123                 if (ret != KERN_SUCCESS)
 124                         return FALSE;
 125
 126                 mono_mach_arch_thread_state_to_mcontext (state, mctx);
 127                 uctx.uc_mcontext = mctx;
 128                 mono_monoctx_to_sigctx (&tmp, &uctx);
 129
 130                 mono_mach_arch_mcontext_to_thread_state (mctx, state);
 131
 132                 do {
 133                         ret = mono_mach_arch_set_thread_state (info->native_handle, state, num_state);
 134                 } while (ret == KERN_ABORTED);
 135
 136                 if (ret != KERN_SUCCESS)
 137                         return FALSE;
 138         }
 139
 140         do {
 141                 ret = thread_resume (info->native_handle);
 142         } while (ret == KERN_ABORTED);
 143         THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
 144
 145         return ret == KERN_SUCCESS;
 146 }
 147
 148 #endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
 149
 150 void
 151 mono_threads_suspend_register (MonoThreadInfo *info)
 152 {
 153         char thread_name [64];
 154
 155         info->native_handle = mach_thread_self ();
 156
 157         snprintf (thread_name, sizeof (thread_name), "tid_%x", (int) info->native_handle);
 158         pthread_setname_np (thread_name);
 159
 160         mono_threads_install_dead_letter ();
 161 }
 162
 163 void
 164 mono_threads_suspend_free (MonoThreadInfo *info)
 165 {
 166         mach_port_deallocate (current_task (), info->native_handle);
 167 }
 168
 169 #endif /* USE_MACH_BACKEND */
 170
 171 #ifdef __MACH__
 172 void
 173 mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize)
 174 {
 175         *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
 176         *stsize = pthread_get_stacksize_np (pthread_self());
 177
 178 #ifdef TARGET_OSX
 179         /*
 180          * Mavericks reports stack sizes as 512kb:
 181          * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
 182          * https://bugs.openjdk.java.net/browse/JDK-8020753
 183          */
 184         if (pthread_main_np () && *stsize == 512 * 1024)
 185                 *stsize = 2048 * mono_pagesize ();
 186 #endif
 187
 188         /* staddr points to the start of the stack, not the end */
 189         *staddr -= *stsize;
 190 }
 191
 192 #endif