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)
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19 * The above copyright notice and this permission notice shall be
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36 #include "metadata/sgen-gc.h"
37 #include "metadata/sgen-archdep.h"
38 #include "metadata/object-internals.h"
39 #include "metadata/gc-internal.h"
42 #include "utils/mach-support.h"
45 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
47 sgen_resume_thread (SgenThreadInfo *info)
49 return thread_resume (info->mach_port) == KERN_SUCCESS;
53 sgen_suspend_thread (SgenThreadInfo *info)
55 mach_msg_type_number_t num_state;
63 state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
64 mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
66 ret = thread_suspend (info->mach_port);
67 if (ret != KERN_SUCCESS)
70 ret = mono_mach_arch_get_thread_state (info->mach_port, state, &num_state);
71 if (ret != KERN_SUCCESS)
74 mono_mach_arch_thread_state_to_mcontext (state, mctx);
75 ctx.uc_mcontext = mctx;
77 info->stopped_domain = mono_mach_arch_get_tls_value_from_thread (
78 mono_thread_info_get_tid (info), mono_domain_get_tls_offset ());
79 info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
80 stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
81 /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
82 if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
83 info->stack_start = stack_start;
86 mono_sigctx_to_monoctx (&ctx, &info->ctx);
87 info->monoctx = &info->ctx;
89 ARCH_COPY_SIGCTX_REGS (&info->regs, &ctx);
90 info->stopped_regs = &info->regs;
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);
104 sgen_wait_for_suspend_ack (int count)
106 /* mach thread_resume is synchronous so we dont need to wait for them */
109 /* LOCKING: assumes the GC lock is held */
111 sgen_thread_handshake (BOOL suspend)
113 SgenThreadInfo *cur_thread = mono_thread_info_current ();
115 SgenThreadInfo *info;
119 FOREACH_THREAD_SAFE (info) {
120 info->joined_stw = suspend;
122 if (info == cur_thread || sgen_is_worker_thread (mono_thread_info_get_tid (info)))
124 if (info->gc_disabled)
128 g_assert (!info->doing_handshake);
129 info->doing_handshake = TRUE;
131 if (!sgen_suspend_thread (info))
134 g_assert (info->doing_handshake);
135 info->doing_handshake = FALSE;
137 ret = thread_resume (info->mach_port);
138 if (ret != KERN_SUCCESS)
142 } END_FOREACH_THREAD_SAFE
152 mono_gc_get_suspend_signal (void)