Merge pull request #1765 from akoeplinger/fix-sgen-independence-win
[mono.git] / 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  * This library is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU Library General Public
14  * License 2.0 as published by the Free Software Foundation;
15  *
16  * This library is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19  * Library General Public License for more details.
20  *
21  * You should have received a copy of the GNU Library General Public
22  * License 2.0 along with this library; if not, write to the Free
23  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 #include "config.h"
27 #ifdef HAVE_SGEN_GC
28
29
30 #include <glib.h>
31 #include "metadata/sgen-gc.h"
32 #include "metadata/sgen-archdep.h"
33 #include "metadata/sgen-protocol.h"
34 #include "metadata/sgen-thread-pool.h"
35 #include "metadata/object-internals.h"
36 #include "metadata/gc-internal.h"
37
38 #if defined(__MACH__)
39 #include "utils/mach-support.h"
40 #endif
41
42 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
43 gboolean
44 sgen_resume_thread (SgenThreadInfo *info)
45 {
46         return thread_resume (info->client_info.info.native_handle) == KERN_SUCCESS;
47 }
48
49 gboolean
50 sgen_suspend_thread (SgenThreadInfo *info)
51 {
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
58         gpointer stack_start;
59
60         state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
61         mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
62
63         ret = thread_suspend (info->client_info.info.native_handle);
64         if (ret != KERN_SUCCESS)
65                 return FALSE;
66
67         ret = mono_mach_arch_get_thread_state (info->client_info.info.native_handle, state, &num_state);
68         if (ret != KERN_SUCCESS)
69                 return FALSE;
70
71         mono_mach_arch_thread_state_to_mcontext (state, mctx);
72         ctx.uc_mcontext = mctx;
73
74         info->client_info.stopped_domain = mono_thread_info_tls_get (info, TLS_KEY_DOMAIN);
75         info->client_info.stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
76         info->client_info.stack_start = NULL;
77         stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
78         /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
79         if (stack_start >= info->client_info.stack_start_limit && stack_start <= info->client_info.stack_end) {
80                 info->client_info.stack_start = stack_start;
81
82 #ifdef USE_MONO_CTX
83                 mono_sigctx_to_monoctx (&ctx, &info->client_info.ctx);
84 #else
85                 ARCH_COPY_SIGCTX_REGS (&info->client_info.regs, &ctx);
86 #endif
87         } else {
88                 g_assert (!info->client_info.stack_start);
89         }
90
91         /* Notify the JIT */
92         if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
93                 mono_gc_get_gc_callbacks ()->thread_suspend_func (info->client_info.runtime_data, &ctx, NULL);
94
95         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);
96         binary_protocol_thread_suspend ((gpointer)mono_thread_info_get_tid (info), info->client_info.stopped_ip);
97
98         return TRUE;
99 }
100
101 void
102 sgen_wait_for_suspend_ack (int count)
103 {
104     /* mach thread_resume is synchronous so we dont need to wait for them */
105 }
106
107 /* LOCKING: assumes the GC lock is held */
108 int
109 sgen_thread_handshake (BOOL suspend)
110 {
111         SgenThreadInfo *cur_thread = mono_thread_info_current ();
112         kern_return_t ret;
113         SgenThreadInfo *info;
114
115         int count = 0;
116
117         cur_thread->client_info.suspend_done = TRUE;
118         FOREACH_THREAD_SAFE (info) {
119                 if (info == cur_thread || sgen_thread_pool_is_thread_pool_thread (mono_thread_info_get_tid (info)))
120                         continue;
121
122                 info->client_info.suspend_done = FALSE;
123                 if (info->client_info.gc_disabled)
124                         continue;
125
126                 if (suspend) {
127                         if (!sgen_suspend_thread (info))
128                                 continue;
129                 } else {
130                         ret = thread_resume (info->client_info.info.native_handle);
131                         if (ret != KERN_SUCCESS)
132                                 continue;
133                 }
134                 count ++;
135         } END_FOREACH_THREAD_SAFE
136         return count;
137 }
138
139 void
140 sgen_os_init (void)
141 {
142 }
143
144 int
145 mono_gc_get_suspend_signal (void)
146 {
147         return -1;
148 }
149
150 int
151 mono_gc_get_restart_signal (void)
152 {
153         return -1;
154 }
155 #endif
156 #endif