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