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-semaphore.h>
  25 #include <mono/utils/mono-threads.h>
  26 #include <mono/utils/hazard-pointer.h>
  27
  28 void
  29 mono_threads_init_platform (void)
  30 {
  31         mono_threads_init_dead_letter ();
  32 }
  33
  34 gboolean
  35 mono_threads_core_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
  36 {
  37         kern_return_t ret;
  38         gboolean res;
  39
  40         g_assert (info);
  41
  42         ret = thread_suspend (info->native_handle);
  43         THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (void*)info->native_handle, ret);
  44         if (ret != KERN_SUCCESS)
  45                 return FALSE;
  46
  47         /* We're in the middle of a self-suspend, resume and register */
  48         if (!mono_threads_transition_finish_async_suspend (info)) {
  49                 mono_threads_add_to_pending_operation_set (info);
  50                 g_assert (thread_resume (info->native_handle) == KERN_SUCCESS);
  51                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (void*)info->native_handle, 0);
  52                 //XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
  53                 return TRUE;
  54         }
  55         res = mono_threads_get_runtime_callbacks ()->
  56                 thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info);
  57         THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (void*)info->native_handle, res);
  58         if (res) {
  59                 if (interrupt_kernel)
  60                         thread_abort (info->native_handle);
  61         } else {
  62                 mono_threads_transition_async_suspend_compensation (info);
  63                 g_assert (thread_resume (info->native_handle) == KERN_SUCCESS);
  64                 THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (void*)info->native_handle, 0);
  65         }
  66         return res;
  67 }
  68
  69 gboolean
  70 mono_threads_core_check_suspend_result (MonoThreadInfo *info)
  71 {
  72         return TRUE;
  73 }
  74
  75 gboolean
  76 mono_threads_core_begin_async_resume (MonoThreadInfo *info)
  77 {
  78         kern_return_t ret;
  79
  80         if (info->async_target) {
  81                 MonoContext tmp = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].ctx;
  82                 mach_msg_type_number_t num_state;
  83                 thread_state_t state;
  84                 ucontext_t uctx;
  85                 mcontext_t mctx;
  86
  87                 mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp, info->async_target, info->user_data);
  88                 info->user_data = NULL;
  89                 info->async_target = (void (*)(void *)) info->user_data;
  90
  91                 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
  92                 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
  93
  94                 ret = mono_mach_arch_get_thread_state (info->native_handle, state, &num_state);
  95                 if (ret != KERN_SUCCESS)
  96                         return FALSE;
  97
  98                 mono_mach_arch_thread_state_to_mcontext (state, mctx);
  99                 uctx.uc_mcontext = mctx;
 100                 mono_monoctx_to_sigctx (&tmp, &uctx);
 101
 102                 mono_mach_arch_mcontext_to_thread_state (mctx, state);
 103
 104                 ret = mono_mach_arch_set_thread_state (info->native_handle, state, num_state);
 105                 if (ret != KERN_SUCCESS)
 106                         return FALSE;
 107         }
 108
 109         ret = thread_resume (info->native_handle);
 110         THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (void*)info->native_handle, ret);
 111
 112         return ret == KERN_SUCCESS;
 113 }
 114
 115 void
 116 mono_threads_platform_register (MonoThreadInfo *info)
 117 {
 118         info->native_handle = mach_thread_self ();
 119         mono_threads_install_dead_letter ();
 120 }
 121
 122 void
 123 mono_threads_platform_free (MonoThreadInfo *info)
 124 {
 125         mach_port_deallocate (current_task (), info->native_handle);
 126 }
 127
 128 void
 129 mono_threads_core_begin_global_suspend (void)
 130 {
 131 }
 132
 133 void
 134 mono_threads_core_end_global_suspend (void)
 135 {
 136 }
 137
 138 #endif /* USE_MACH_BACKEND */
 139
 140 #ifdef __MACH__
 141 void
 142 mono_threads_core_get_stack_bounds (guint8 **staddr, size_t *stsize)
 143 {
 144         *staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
 145         *stsize = pthread_get_stacksize_np (pthread_self());
 146
 147 #ifdef TARGET_OSX
 148         /*
 149          * Mavericks reports stack sizes as 512kb:
 150          * http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
 151          * https://bugs.openjdk.java.net/browse/JDK-8020753
 152          */
 153         if (pthread_main_np () && *stsize == 512 * 1024)
 154                 *stsize = 2048 * mono_pagesize ();
 155 #endif
 156
 157         /* staddr points to the start of the stack, not the end */
 158         *staddr -= *stsize;
 159 }
 160
 161 #endif