2 * sgen-os-mach.c: Simple generational GC.
5 * Paolo Molaro (lupus@ximian.com)
6 * Mark Probst (mprobst@novell.com)
7 * Geoff Norton (gnorton@novell.com)
9 * Copyright 2010 Novell, Inc (http://www.novell.com)
11 * Permission is hereby granted, free of charge, to any person obtaining
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13 * "Software"), to deal in the Software without restriction, including
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16 * permit persons to whom the Software is furnished to do so, subject to
17 * the following conditions:
19 * The above copyright notice and this permission notice shall be
20 * included in all copies or substantial portions of the Software.
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36 #include "metadata/sgen-gc.h"
37 #include "metadata/sgen-archdep.h"
38 #include "metadata/sgen-protocol.h"
39 #include "metadata/object-internals.h"
40 #include "metadata/gc-internal.h"
43 #include "utils/mach-support.h"
46 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
48 sgen_resume_thread (SgenThreadInfo *info)
50 return thread_resume (info->info.native_handle) == KERN_SUCCESS;
54 sgen_suspend_thread (SgenThreadInfo *info)
56 mach_msg_type_number_t num_state;
64 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
65 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
67 ret = thread_suspend (info->info.native_handle);
68 if (ret != KERN_SUCCESS)
71 ret = mono_mach_arch_get_thread_state (info->info.native_handle, state, &num_state);
72 if (ret != KERN_SUCCESS)
75 mono_mach_arch_thread_state_to_mcontext (state, mctx);
76 ctx.uc_mcontext = mctx;
78 info->stopped_domain = mono_mach_arch_get_tls_value_from_thread (
79 mono_thread_info_get_tid (info), mono_domain_get_tls_offset ());
80 info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
81 info->stack_start = NULL;
82 stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
83 /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
84 if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
85 info->stack_start = stack_start;
88 mono_sigctx_to_monoctx (&ctx, &info->ctx);
90 ARCH_COPY_SIGCTX_REGS (&info->regs, &ctx);
93 g_assert (!info->stack_start);
97 if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
98 mono_gc_get_gc_callbacks ()->thread_suspend_func (info->runtime_data, &ctx, NULL);
100 DEBUG (1, fprintf (gc_debug_file, "thread %p stopped at %p stack_start=%p\n", (void*)info->info.native_handle, info->stopped_ip, info->stack_start));
102 binary_protocol_thread_suspend ((gpointer)mono_thread_info_get_tid (info), info->stopped_ip);
108 sgen_wait_for_suspend_ack (int count)
110 /* mach thread_resume is synchronous so we dont need to wait for them */
113 /* LOCKING: assumes the GC lock is held */
115 sgen_thread_handshake (BOOL suspend)
117 SgenThreadInfo *cur_thread = mono_thread_info_current ();
119 SgenThreadInfo *info;
123 FOREACH_THREAD_SAFE (info) {
124 if (info->joined_stw == suspend)
126 info->joined_stw = suspend;
128 if (info == cur_thread || sgen_is_worker_thread (mono_thread_info_get_tid (info)))
130 if (info->gc_disabled)
134 g_assert (!info->doing_handshake);
135 info->doing_handshake = TRUE;
137 if (!sgen_suspend_thread (info))
140 g_assert (info->doing_handshake);
141 info->doing_handshake = FALSE;
143 ret = thread_resume (info->info.native_handle);
144 if (ret != KERN_SUCCESS)
148 } END_FOREACH_THREAD_SAFE
158 mono_gc_get_suspend_signal (void)