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