mono/metadata/sgen-os-mach.c

   1 /*
   2  * sgen-os-mach.c: Mach-OS support.
   3  *
   4  * Author:
   5  *      Paolo Molaro (lupus@ximian.com)
   6  *      Mark Probst (mprobst@novell.com)
   7  *      Geoff Norton (gnorton@novell.com)
   8  *
   9  * Copyright 2010 Novell, Inc (http://www.novell.com)
  10  * Copyright (C) 2012 Xamarin Inc
  11  *
  12  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  13  */
  14
  15 #include "config.h"
  16 #ifdef HAVE_SGEN_GC
  17
  18
  19 #include <glib.h>
  20 #include "sgen/sgen-gc.h"
  21 #include "sgen/sgen-archdep.h"
  22 #include "sgen/sgen-protocol.h"
  23 #include "sgen/sgen-thread-pool.h"
  24 #include "metadata/object-internals.h"
  25 #include "metadata/gc-internals.h"
  26
  27 #if defined(__MACH__)
  28 #include "utils/mach-support.h"
  29 #endif
  30
  31 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
  32
  33 #if !defined(USE_COOP_GC)
  34 gboolean
  35 sgen_resume_thread (SgenThreadInfo *info)
  36 {
  37         kern_return_t ret;
  38         do {
  39                 ret = thread_resume (info->client_info.info.native_handle);
  40         } while (ret == KERN_ABORTED);
  41         return ret == KERN_SUCCESS;
  42 }
  43
  44 gboolean
  45 sgen_suspend_thread (SgenThreadInfo *info)
  46 {
  47         mach_msg_type_number_t num_state;
  48         thread_state_t state;
  49         kern_return_t ret;
  50         ucontext_t ctx;
  51         mcontext_t mctx;
  52
  53         gpointer stack_start;
  54
  55         state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
  56         mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
  57
  58         do {
  59                 ret = thread_suspend (info->client_info.info.native_handle);
  60         } while (ret == KERN_ABORTED);
  61         if (ret != KERN_SUCCESS)
  62                 return FALSE;
  63
  64         do {
  65                 ret = mono_mach_arch_get_thread_state (info->client_info.info.native_handle, state, &num_state);
  66         } while (ret == KERN_ABORTED);
  67         if (ret != KERN_SUCCESS)
  68                 return FALSE;
  69
  70         mono_mach_arch_thread_state_to_mcontext (state, mctx);
  71         ctx.uc_mcontext = mctx;
  72
  73         info->client_info.stopped_domain = mono_thread_info_tls_get (info, TLS_KEY_DOMAIN);
  74         info->client_info.stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
  75         info->client_info.stack_start = NULL;
  76         stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
  77         /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
  78         if (stack_start >= info->client_info.stack_start_limit && stack_start <= info->client_info.stack_end) {
  79                 info->client_info.stack_start = stack_start;
  80
  81                 mono_sigctx_to_monoctx (&ctx, &info->client_info.ctx);
  82         } else {
  83                 g_assert (!info->client_info.stack_start);
  84         }
  85
  86         /* Notify the JIT */
  87         if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
  88                 mono_gc_get_gc_callbacks ()->thread_suspend_func (info->client_info.runtime_data, &ctx, NULL);
  89
  90         SGEN_LOG (2, "thread %p stopped at %p stack_start=%p", (void*)(gsize)info->client_info.info.native_handle, info->client_info.stopped_ip, info->client_info.stack_start);
  91         binary_protocol_thread_suspend ((gpointer)mono_thread_info_get_tid (info), info->client_info.stopped_ip);
  92
  93         return TRUE;
  94 }
  95
  96 void
  97 sgen_wait_for_suspend_ack (int count)
  98 {
  99     /* mach thread_resume is synchronous so we dont need to wait for them */
 100 }
 101
 102 /* LOCKING: assumes the GC lock is held */
 103 int
 104 sgen_thread_handshake (BOOL suspend)
 105 {
 106         SgenThreadInfo *cur_thread = mono_thread_info_current ();
 107         kern_return_t ret;
 108
 109         int count = 0;
 110
 111         cur_thread->client_info.suspend_done = TRUE;
 112         FOREACH_THREAD (info) {
 113                 if (info == cur_thread || sgen_thread_pool_is_thread_pool_thread (mono_thread_info_get_tid (info)))
 114                         continue;
 115
 116                 info->client_info.suspend_done = FALSE;
 117                 if (info->client_info.gc_disabled)
 118                         continue;
 119
 120                 if (suspend) {
 121                         if (!sgen_suspend_thread (info))
 122                                 continue;
 123                 } else {
 124                         do {
 125                                 ret = thread_resume (info->client_info.info.native_handle);
 126                         } while (ret == KERN_ABORTED);
 127                         if (ret != KERN_SUCCESS)
 128                                 continue;
 129                 }
 130                 count ++;
 131         } FOREACH_THREAD_END
 132         return count;
 133 }
 134
 135 void
 136 sgen_os_init (void)
 137 {
 138 }
 139
 140 int
 141 mono_gc_get_suspend_signal (void)
 142 {
 143         return -1;
 144 }
 145
 146 int
 147 mono_gc_get_restart_signal (void)
 148 {
 149         return -1;
 150 }
 151 #endif
 152 #endif
 153 #endif