mono/metadata/sgen-os-mach.c

   1 /*
   2  * sgen-os-mach.c: Simple generational GC.
   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  *
  11  * Permission is hereby granted, free of charge, to any person obtaining
  12  * a copy of this software and associated documentation files (the
  13  * "Software"), to deal in the Software without restriction, including
  14  * without limitation the rights to use, copy, modify, merge, publish,
  15  * distribute, sublicense, and/or sell copies of the Software, and to
  16  * permit persons to whom the Software is furnished to do so, subject to
  17  * the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be
  20  * included in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include "config.h"
  32 #ifdef HAVE_SGEN_GC
  33 #include <glib.h>
  34 #include "metadata/gc-internal.h"
  35 #include "metadata/sgen-gc.h"
  36 #include "metadata/sgen-archdep.h"
  37 #include "metadata/object-internals.h"
  38
  39 #if defined(__MACH__)
  40 #include "utils/mach-support.h"
  41 #endif
  42
  43 /* LOCKING: assumes the GC lock is held */
  44 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
  45 int
  46 mono_sgen_thread_handshake (int signum)
  47 {
  48         task_t task = current_task ();
  49         thread_port_t cur_thread = mach_thread_self ();
  50         thread_act_array_t thread_list;
  51         mach_msg_type_number_t num_threads;
  52         mach_msg_type_number_t num_state;
  53         thread_state_t state;
  54         kern_return_t ret;
  55         ucontext_t ctx;
  56         mcontext_t mctx;
  57         pthread_t exception_thread = mono_gc_get_mach_exception_thread ();
  58
  59         SgenThreadInfo *info;
  60         gpointer regs [ARCH_NUM_REGS];
  61         gpointer stack_start;
  62
  63         int count, i;
  64
  65         mono_mach_get_threads (&thread_list, &num_threads);
  66
  67         for (i = 0, count = 0; i < num_threads; i++) {
  68                 thread_port_t t = thread_list [i];
  69                 pthread_t pt = pthread_from_mach_thread_np (t);
  70                 if (t != cur_thread && pt != exception_thread && !mono_sgen_is_worker_thread (pt)) {
  71                         if (signum == suspend_signal_num) {
  72                                 ret = thread_suspend (t);
  73                                 if (ret != KERN_SUCCESS) {
  74                                         mach_port_deallocate (task, t);
  75                                         continue;
  76                                 }
  77
  78                                 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
  79                                 ret = mono_mach_arch_get_thread_state (t, state, &num_state);
  80                                 if (ret != KERN_SUCCESS) {
  81                                         mach_port_deallocate (task, t);
  82                                         continue;
  83                                 }
  84
  85
  86                                 info = mono_sgen_thread_info_lookup (pt);
  87
  88                                 /* Ensure that the runtime is aware of this thread */
  89                                 if (info != NULL) {
  90                                         mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
  91                                         mono_mach_arch_thread_state_to_mcontext (state, mctx);
  92                                         ctx.uc_mcontext = mctx;
  93
  94                                         info->stopped_domain = mono_mach_arch_get_tls_value_from_thread (t, mono_pthread_key_for_tls (mono_domain_get_tls_key ()));
  95                                         info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
  96                                         stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
  97                                         /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
  98                                         if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
  99                                                 info->stack_start = stack_start;
 100
 101                                                 ARCH_COPY_SIGCTX_REGS (regs, &ctx);
 102                                                 info->stopped_regs = regs;
 103                                         } else {
 104                                                 g_assert (!info->stack_start);
 105                                         }
 106
 107                                         /* Notify the JIT */
 108                                         if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
 109                                                 mono_gc_get_gc_callbacks ()->thread_suspend_func (info->runtime_data, &ctx);
 110                                 }
 111                         } else {
 112                                 ret = thread_resume (t);
 113                                 if (ret != KERN_SUCCESS) {
 114                                         mach_port_deallocate (task, t);
 115                                         continue;
 116                                 }
 117                         }
 118                         count ++;
 119
 120                         mach_port_deallocate (task, t);
 121                 } else {
 122                         mach_port_deallocate (task, t);
 123                 }
 124         }
 125
 126         mono_mach_free_threads (thread_list, num_threads);
 127
 128         mach_port_deallocate (task, cur_thread);
 129
 130         return count;
 131 }
 132 #endif
 133 #endif