/**
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* \file
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* Low-level threading, mach version
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*
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* Author:
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* Rodrigo Kumpera (kumpera@gmail.com)
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*
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* (C) 2011 Novell, Inc
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*/
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#include "config.h"
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/* For pthread_main_np, pthread_get_stackaddr_np and pthread_get_stacksize_np */
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#if defined (__MACH__)
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#define _DARWIN_C_SOURCE 1
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#endif
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#include <mono/utils/mono-threads.h>
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#include <mono/utils/mono-mmap.h>
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#if defined (USE_MACH_BACKEND)
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#include <mono/utils/mach-support.h>
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#include <mono/utils/mono-compiler.h>
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#include <mono/utils/mono-threads.h>
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#include <mono/utils/hazard-pointer.h>
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#include <mono/utils/mono-threads-debug.h>
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void
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mono_threads_suspend_init (void)
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{
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mono_threads_init_dead_letter ();
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}
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#if defined(HOST_WATCHOS) || defined(HOST_TVOS)
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gboolean
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mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
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{
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g_assert_not_reached ();
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}
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gboolean
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mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
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{
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g_assert_not_reached ();
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}
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gboolean
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mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
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{
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g_assert_not_reached ();
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}
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void
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mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
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{
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}
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#else /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
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gboolean
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mono_threads_suspend_begin_async_suspend (MonoThreadInfo *info, gboolean interrupt_kernel)
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{
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kern_return_t ret;
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g_assert (info);
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do {
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ret = thread_suspend (info->native_handle);
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} while (ret == KERN_ABORTED);
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THREADS_SUSPEND_DEBUG ("SUSPEND %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
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if (ret != KERN_SUCCESS)
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return FALSE;
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/* We're in the middle of a self-suspend, resume and register */
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if (!mono_threads_transition_finish_async_suspend (info)) {
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mono_threads_add_to_pending_operation_set (info);
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do {
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ret = thread_resume (info->native_handle);
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} while (ret == KERN_ABORTED);
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g_assert (ret == KERN_SUCCESS);
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THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/1 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
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//XXX interrupt_kernel doesn't make sense in this case as the target is not in a syscall
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return TRUE;
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}
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info->suspend_can_continue = mono_threads_get_runtime_callbacks ()->
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thread_state_init_from_handle (&info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX], info, NULL);
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THREADS_SUSPEND_DEBUG ("thread state %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
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if (info->suspend_can_continue) {
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if (interrupt_kernel)
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thread_abort (info->native_handle);
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} else {
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THREADS_SUSPEND_DEBUG ("FAILSAFE RESUME/2 %p -> %d\n", (gpointer)(gsize)info->native_handle, 0);
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}
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return TRUE;
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}
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gboolean
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mono_threads_suspend_check_suspend_result (MonoThreadInfo *info)
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{
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return info->suspend_can_continue;
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}
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gboolean
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mono_threads_suspend_begin_async_resume (MonoThreadInfo *info)
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{
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kern_return_t ret;
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if (info->async_target) {
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MonoContext tmp = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].ctx;
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mach_msg_type_number_t num_state, num_fpstate;
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thread_state_t state, fpstate;
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ucontext_t uctx;
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mcontext_t mctx;
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mono_threads_get_runtime_callbacks ()->setup_async_callback (&tmp, info->async_target, info->user_data);
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info->user_data = NULL;
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info->async_target = (void (*)(void *)) info->user_data;
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state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
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fpstate = (thread_state_t) alloca (mono_mach_arch_get_thread_fpstate_size ());
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mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
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do {
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ret = mono_mach_arch_get_thread_states (info->native_handle, state, &num_state, fpstate, &num_fpstate);
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} while (ret == KERN_ABORTED);
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if (ret != KERN_SUCCESS)
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return FALSE;
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mono_mach_arch_thread_states_to_mcontext (state, fpstate, mctx);
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uctx.uc_mcontext = mctx;
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mono_monoctx_to_sigctx (&tmp, &uctx);
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mono_mach_arch_mcontext_to_thread_states (mctx, state, fpstate);
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do {
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ret = mono_mach_arch_set_thread_states (info->native_handle, state, num_state, fpstate, num_fpstate);
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} while (ret == KERN_ABORTED);
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if (ret != KERN_SUCCESS)
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return FALSE;
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}
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do {
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ret = thread_resume (info->native_handle);
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} while (ret == KERN_ABORTED);
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THREADS_SUSPEND_DEBUG ("RESUME %p -> %d\n", (gpointer)(gsize)info->native_handle, ret);
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return ret == KERN_SUCCESS;
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}
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void
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mono_threads_suspend_abort_syscall (MonoThreadInfo *info)
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{
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kern_return_t ret;
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do {
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ret = thread_suspend (info->native_handle);
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} while (ret == KERN_ABORTED);
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if (ret != KERN_SUCCESS)
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return;
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do {
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ret = thread_abort_safely (info->native_handle);
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} while (ret == KERN_ABORTED);
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/*
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* We are doing thread_abort when thread_abort_safely returns KERN_SUCCESS because
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* for some reason accept is not interrupted by thread_abort_safely.
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* The risk of aborting non-atomic operations while calling thread_abort should not
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* exist because by the time thread_abort_safely returns KERN_SUCCESS the target
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* thread should have return from the kernel and should be waiting for thread_resume
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* to resume the user code.
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*/
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if (ret == KERN_SUCCESS)
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ret = thread_abort (info->native_handle);
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do {
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ret = thread_resume (info->native_handle);
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} while (ret == KERN_ABORTED);
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g_assert (ret == KERN_SUCCESS);
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}
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#endif /* defined(HOST_WATCHOS) || defined(HOST_TVOS) */
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void
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mono_threads_suspend_register (MonoThreadInfo *info)
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{
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char thread_name [64];
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info->native_handle = mach_thread_self ();
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snprintf (thread_name, sizeof (thread_name), "tid_%x", (int) info->native_handle);
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pthread_setname_np (thread_name);
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mono_threads_install_dead_letter ();
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}
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void
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mono_threads_suspend_free (MonoThreadInfo *info)
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{
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mach_port_deallocate (current_task (), info->native_handle);
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}
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void
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mono_threads_suspend_init_signals (void)
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{
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}
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gint
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mono_threads_suspend_search_alternative_signal (void)
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{
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g_assert_not_reached ();
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}
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gint
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mono_threads_suspend_get_suspend_signal (void)
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{
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return -1;
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}
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gint
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mono_threads_suspend_get_restart_signal (void)
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{
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return -1;
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}
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gint
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mono_threads_suspend_get_abort_signal (void)
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{
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return -1;
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}
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#endif /* USE_MACH_BACKEND */
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#ifdef __MACH__
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void
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mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize)
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{
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*staddr = (guint8*)pthread_get_stackaddr_np (pthread_self());
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*stsize = pthread_get_stacksize_np (pthread_self());
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#ifdef TARGET_OSX
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/*
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* Mavericks reports stack sizes as 512kb:
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* http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.devel/11590
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* https://bugs.openjdk.java.net/browse/JDK-8020753
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*/
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if (pthread_main_np () && *stsize == 512 * 1024)
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*stsize = 2048 * mono_pagesize ();
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#endif
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/* staddr points to the start of the stack, not the end */
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*staddr -= *stsize;
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}
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#endif
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