/**
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* \file
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* Low-level threading, posix 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-coop-semaphore.h>
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#include <mono/metadata/gc-internals.h>
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#include <mono/utils/mono-threads-debug.h>
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#include <errno.h>
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/*
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#if defined(HOST_ANDROID) && !defined(TARGET_ARM64) && !defined(TARGET_AMD64)
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#define USE_TKILL_ON_ANDROID 1
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#endif
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*/
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#ifdef USE_TKILL_ON_ANDROID
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extern int tkill (pid_t tid, int signal);
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#endif
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#if (defined(_POSIX_VERSION) && !defined (TARGET_WASM)) || (defined(TARGET_WASM) && defined(__EMSCRIPTEN_PTHREADS__))
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#include <pthread.h>
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#include <sys/resource.h>
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gboolean
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mono_thread_platform_create_thread (MonoThreadStart thread_fn, gpointer thread_data, gsize* const stack_size, MonoNativeThreadId *tid)
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{
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pthread_attr_t attr;
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pthread_t thread;
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gint res;
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gsize set_stack_size;
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res = pthread_attr_init (&attr);
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if (res != 0)
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g_error ("%s: pthread_attr_init failed, error: \"%s\" (%d)", __func__, g_strerror (res), res);
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if (stack_size)
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set_stack_size = *stack_size;
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else
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set_stack_size = 0;
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#ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE
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if (set_stack_size == 0) {
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#if HAVE_VALGRIND_MEMCHECK_H
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if (RUNNING_ON_VALGRIND)
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set_stack_size = 1 << 20;
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else
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set_stack_size = (SIZEOF_VOID_P / 4) * 1024 * 1024;
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#else
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set_stack_size = (SIZEOF_VOID_P / 4) * 1024 * 1024;
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#endif
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}
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#ifdef PTHREAD_STACK_MIN
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if (set_stack_size < PTHREAD_STACK_MIN)
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set_stack_size = PTHREAD_STACK_MIN;
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#endif
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res = pthread_attr_setstacksize (&attr, set_stack_size);
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if (res != 0)
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g_error ("%s: pthread_attr_setstacksize failed, error: \"%s\" (%d)", __func__, g_strerror (res), res);
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#endif /* HAVE_PTHREAD_ATTR_SETSTACKSIZE */
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/* Actually start the thread */
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#ifdef RUNTIME_IL2CPP
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res = pthread_create (&thread, &attr, (gpointer (*)(gpointer)) thread_fn, thread_data);
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#else
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res = mono_gc_pthread_create (&thread, &attr, (gpointer (*)(gpointer)) thread_fn, thread_data);
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#endif
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if (res) {
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res = pthread_attr_destroy (&attr);
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if (res != 0)
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g_error ("%s: pthread_attr_destroy failed, error: \"%s\" (%d)", __func__, g_strerror (res), res);
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return FALSE;
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}
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if (tid)
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*tid = thread;
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if (stack_size) {
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res = pthread_attr_getstacksize (&attr, stack_size);
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if (res != 0)
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g_error ("%s: pthread_attr_getstacksize failed, error: \"%s\" (%d)", __func__, g_strerror (res), res);
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}
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res = pthread_attr_destroy (&attr);
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if (res != 0)
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g_error ("%s: pthread_attr_destroy failed, error: \"%s\" (%d)", __func__, g_strerror (res), res);
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return TRUE;
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}
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void
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mono_threads_platform_init (void)
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{
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}
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gboolean
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mono_threads_platform_in_critical_region (MonoNativeThreadId tid)
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{
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return FALSE;
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}
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gboolean
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mono_threads_platform_yield (void)
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{
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return sched_yield () == 0;
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}
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void
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mono_threads_platform_exit (gsize exit_code)
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{
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pthread_exit ((gpointer) exit_code);
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}
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int
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mono_threads_get_max_stack_size (void)
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{
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struct rlimit lim;
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/* If getrlimit fails, we don't enforce any limits. */
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if (getrlimit (RLIMIT_STACK, &lim))
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return INT_MAX;
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/* rlim_t is an unsigned long long on 64bits OSX but we want an int response. */
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if (lim.rlim_max > (rlim_t)INT_MAX)
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return INT_MAX;
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return (int)lim.rlim_max;
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}
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int
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mono_threads_pthread_kill (MonoThreadInfo *info, int signum)
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{
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THREADS_SUSPEND_DEBUG ("sending signal %d to %p[%p]\n", signum, info, mono_thread_info_get_tid (info));
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int result;
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#ifdef USE_TKILL_ON_ANDROID
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int old_errno = errno;
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result = tkill (info->native_handle, signum);
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if (result < 0) {
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result = errno;
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errno = old_errno;
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}
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#elif defined (HAVE_PTHREAD_KILL)
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result = pthread_kill (mono_thread_info_get_tid (info), signum);
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#else
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result = -1;
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g_error ("pthread_kill () is not supported by this platform");
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#endif
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if (result && result != ESRCH)
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g_error ("%s: pthread_kill failed with error %d - potential kernel OOM or signal queue overflow", __func__, result);
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return result;
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}
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MonoNativeThreadId
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mono_native_thread_id_get (void)
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{
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return pthread_self ();
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}
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gboolean
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mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2)
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{
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return pthread_equal (id1, id2);
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}
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/*
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* mono_native_thread_create:
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*
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* Low level thread creation function without any GC wrappers.
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*/
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gboolean
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mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg)
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{
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return pthread_create (tid, NULL, (void *(*)(void *)) func, arg) == 0;
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}
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void
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mono_native_thread_set_name (MonoNativeThreadId tid, const char *name)
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{
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#ifdef __MACH__
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/*
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* We can't set the thread name for other threads, but we can at least make
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* it work for threads that try to change their own name.
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*/
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if (tid != mono_native_thread_id_get ())
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return;
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if (!name) {
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pthread_setname_np ("");
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} else {
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char n [63];
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strncpy (n, name, sizeof (n) - 1);
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n [sizeof (n) - 1] = '\0';
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pthread_setname_np (n);
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}
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#elif defined (__NetBSD__)
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if (!name) {
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pthread_setname_np (tid, "%s", (void*)"");
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} else {
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char n [PTHREAD_MAX_NAMELEN_NP];
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strncpy (n, name, sizeof (n) - 1);
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n [sizeof (n) - 1] = '\0';
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pthread_setname_np (tid, "%s", (void*)n);
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}
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#elif defined (HAVE_PTHREAD_SETNAME_NP)
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if (!name) {
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pthread_setname_np (tid, "");
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} else {
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char n [16];
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strncpy (n, name, sizeof (n) - 1);
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n [sizeof (n) - 1] = '\0';
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pthread_setname_np (tid, n);
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}
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#endif
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}
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gboolean
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mono_native_thread_join (MonoNativeThreadId tid)
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{
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void *res;
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return !pthread_join (tid, &res);
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}
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#endif /* defined(_POSIX_VERSION) */
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#if defined(USE_POSIX_BACKEND)
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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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int sig = interrupt_kernel ? mono_threads_suspend_get_abort_signal () : mono_threads_suspend_get_suspend_signal ();
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if (!mono_threads_pthread_kill (info, sig)) {
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mono_threads_add_to_pending_operation_set (info);
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return TRUE;
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}
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return FALSE;
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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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/*
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This begins async resume. This function must do the following:
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- Install an async target if one was requested.
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- Notify the target to resume.
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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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int sig = mono_threads_suspend_get_restart_signal ();
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if (!mono_threads_pthread_kill (info, sig)) {
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mono_threads_add_to_pending_operation_set (info);
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return TRUE;
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}
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return FALSE;
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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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/* We signal a thread to break it from the current syscall.
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* This signal should not be interpreted as a suspend request. */
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info->syscall_break_signal = TRUE;
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if (mono_threads_pthread_kill (info, mono_threads_suspend_get_abort_signal ()) == 0) {
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mono_threads_add_to_pending_operation_set (info);
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}
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}
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void
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mono_threads_suspend_register (MonoThreadInfo *info)
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{
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#if defined (HOST_ANDROID)
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info->native_handle = gettid ();
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#endif
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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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}
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void
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mono_threads_suspend_init (void)
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{
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}
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#endif /* defined(USE_POSIX_BACKEND) */
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