+/*
+ * This software is part of the SBCL system. See the README file for
+ * more information.
+ *
+ * This software is derived from the CMU CL system, which was
+ * written at Carnegie Mellon University and released into the
+ * public domain. The software is in the public domain and is
+ * provided with absolutely no warranty. See the COPYING and CREDITS
+ * files for more information.
+ */
+
+#include "sbcl.h"
+
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#ifndef LISP_FEATURE_WIN32
#include <sched.h>
-#include <signal.h>
+#endif
+#include "runtime.h"
#include <stddef.h>
#include <errno.h>
#include <sys/types.h>
+#ifndef LISP_FEATURE_WIN32
#include <sys/wait.h>
+#endif
+
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+#include <mach/mach.h>
+#include <mach/mach_error.h>
+#include <mach/mach_types.h>
+#endif
-#include "sbcl.h"
#include "runtime.h"
-#include "validate.h" /* for CONTROL_STACK_SIZE etc */
-#include "alloc.h"
+#include "validate.h" /* for BINDING_STACK_SIZE etc */
#include "thread.h"
#include "arch.h"
#include "target-arch-os.h"
#include "genesis/cons.h"
#include "genesis/fdefn.h"
#include "interr.h" /* for lose() */
+#include "alloc.h"
#include "gc-internal.h"
+#include "cpputil.h"
+#include "pseudo-atomic.h"
+#include "interrupt.h"
+#include "lispregs.h"
-#define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */
+#if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THREAD)
+# define IMMEDIATE_POST_MORTEM
+#endif
-int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */
-struct thread * volatile all_threads;
-extern struct interrupt_data * global_interrupt_data;
-extern int linux_no_threads_p;
+#if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_SB_THREAD)
+#define DELAY_THREAD_POST_MORTEM 5
+#define LOCK_CREATE_THREAD
+#endif
+
+#ifdef LISP_FEATURE_FREEBSD
+#define CREATE_CLEANUP_THREAD
+#define LOCK_CREATE_THREAD
+#endif
#ifdef LISP_FEATURE_SB_THREAD
+struct thread_post_mortem {
+#ifdef DELAY_THREAD_POST_MORTEM
+ struct thread_post_mortem *next;
+#endif
+ os_thread_t os_thread;
+ pthread_attr_t *os_attr;
+ os_vm_address_t os_address;
+};
+
+#ifdef DELAY_THREAD_POST_MORTEM
+static int pending_thread_post_mortem_count = 0;
+pthread_mutex_t thread_post_mortem_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+static struct thread_post_mortem * volatile pending_thread_post_mortem = 0;
+#endif
+
+int dynamic_values_bytes=TLS_SIZE*sizeof(lispobj); /* same for all threads */
+struct thread *all_threads;
+extern struct interrupt_data * global_interrupt_data;
+#ifdef LISP_FEATURE_SB_THREAD
pthread_mutex_t all_threads_lock = PTHREAD_MUTEX_INITIALIZER;
+#ifdef LOCK_CREATE_THREAD
+static pthread_mutex_t create_thread_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+#ifdef LISP_FEATURE_GCC_TLS
+__thread struct thread *current_thread;
+#endif
+pthread_key_t lisp_thread = 0;
+#endif
+
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+extern lispobj call_into_lisp_first_time(lispobj fun, lispobj *args, int nargs)
+# ifdef LISP_FEATURE_X86_64
+ __attribute__((sysv_abi))
+# endif
+ ;
+#endif
-/* When trying to get all_threads_lock one should make sure that
- * sig_stop_for_gc is not blocked. Else there would be a possible
- * deadlock: gc locks it, other thread blocks signals, gc sends stop
- * request to other thread and waits, other thread blocks on lock. */
-void check_sig_stop_for_gc_can_arrive_or_lose()
+static void
+link_thread(struct thread *th)
{
- /* Get the current sigmask, by blocking the empty set. */
- sigset_t empty,current;
- sigemptyset(&empty);
- thread_sigmask(SIG_BLOCK, &empty, ¤t);
- if (sigismember(¤t,SIG_STOP_FOR_GC))
- lose("SIG_STOP_FOR_GC cannot arrive: it is blocked\n");
- if (SymbolValue(GC_INHIBIT,arch_os_get_current_thread()) != NIL)
- lose("SIG_STOP_FOR_GC cannot arrive: gc is inhibited\n");
- if (arch_pseudo_atomic_atomic(NULL))
- lose("SIG_STOP_FOR_GC cannot arrive: in pseudo atomic\n");
+ if (all_threads) all_threads->prev=th;
+ th->next=all_threads;
+ th->prev=0;
+ all_threads=th;
}
-#define GET_ALL_THREADS_LOCK(name) \
- { \
- sigset_t _newset,_oldset; \
- sigemptyset(&_newset); \
- sigaddset_deferrable(&_newset); \
- thread_sigmask(SIG_BLOCK, &_newset, &_oldset); \
- check_sig_stop_for_gc_can_arrive_or_lose(); \
- FSHOW_SIGNAL((stderr,"/%s:waiting on lock=%ld, thread=%lu\n",name, \
- all_threads_lock,arch_os_get_current_thread()->os_thread)); \
- pthread_mutex_lock(&all_threads_lock); \
- FSHOW_SIGNAL((stderr,"/%s:got lock, thread=%lu\n", \
- name,arch_os_get_current_thread()->os_thread));
-
-#define RELEASE_ALL_THREADS_LOCK(name) \
- FSHOW_SIGNAL((stderr,"/%s:released lock\n",name)); \
- pthread_mutex_unlock(&all_threads_lock); \
- thread_sigmask(SIG_SETMASK,&_oldset,0); \
- }
-#endif
+#ifdef LISP_FEATURE_SB_THREAD
+static void
+unlink_thread(struct thread *th)
+{
+ if (th->prev)
+ th->prev->next = th->next;
+ else
+ all_threads = th->next;
+ if (th->next)
+ th->next->prev = th->prev;
+}
+#ifndef LISP_FEATURE_SB_SAFEPOINT
+/* Only access thread state with blockables blocked. */
+lispobj
+thread_state(struct thread *thread)
+{
+ lispobj state;
+ sigset_t old;
+ block_blockable_signals(NULL, &old);
+ os_sem_wait(thread->state_sem, "thread_state");
+ state = thread->state;
+ os_sem_post(thread->state_sem, "thread_state");
+ thread_sigmask(SIG_SETMASK, &old, NULL);
+ return state;
+}
-#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
-extern lispobj call_into_lisp_first_time(lispobj fun, lispobj *args, int nargs);
-#endif
+void
+set_thread_state(struct thread *thread, lispobj state)
+{
+ int i, waitcount = 0;
+ sigset_t old;
+ block_blockable_signals(NULL, &old);
+ os_sem_wait(thread->state_sem, "set_thread_state");
+ if (thread->state != state) {
+ if ((STATE_STOPPED==state) ||
+ (STATE_DEAD==state)) {
+ waitcount = thread->state_not_running_waitcount;
+ thread->state_not_running_waitcount = 0;
+ for (i=0; i<waitcount; i++)
+ os_sem_post(thread->state_not_running_sem, "set_thread_state (not running)");
+ }
+ if ((STATE_RUNNING==state) ||
+ (STATE_DEAD==state)) {
+ waitcount = thread->state_not_stopped_waitcount;
+ thread->state_not_stopped_waitcount = 0;
+ for (i=0; i<waitcount; i++)
+ os_sem_post(thread->state_not_stopped_sem, "set_thread_state (not stopped)");
+ }
+ thread->state = state;
+ }
+ os_sem_post(thread->state_sem, "set_thread_state");
+ thread_sigmask(SIG_SETMASK, &old, NULL);
+}
+
+void
+wait_for_thread_state_change(struct thread *thread, lispobj state)
+{
+ sigset_t old;
+ os_sem_t *wait_sem;
+ block_blockable_signals(NULL, &old);
+ start:
+ os_sem_wait(thread->state_sem, "wait_for_thread_state_change");
+ if (thread->state == state) {
+ switch (state) {
+ case STATE_RUNNING:
+ wait_sem = thread->state_not_running_sem;
+ thread->state_not_running_waitcount++;
+ break;
+ case STATE_STOPPED:
+ wait_sem = thread->state_not_stopped_sem;
+ thread->state_not_stopped_waitcount++;
+ break;
+ default:
+ lose("Invalid state in wait_for_thread_state_change: "OBJ_FMTX"\n", state);
+ }
+ } else {
+ wait_sem = NULL;
+ }
+ os_sem_post(thread->state_sem, "wait_for_thread_state_change");
+ if (wait_sem) {
+ os_sem_wait(wait_sem, "wait_for_thread_state_change");
+ goto start;
+ }
+ thread_sigmask(SIG_SETMASK, &old, NULL);
+}
+#endif /* sb-safepoint */
+#endif /* sb-thread */
static int
initial_thread_trampoline(struct thread *th)
#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
lispobj *args = NULL;
#endif
+#ifdef LISP_FEATURE_SB_THREAD
+ pthread_setspecific(lisp_thread, (void *)1);
+#endif
+#if defined(THREADS_USING_GCSIGNAL) && defined(LISP_FEATURE_PPC)
+ /* SIG_STOP_FOR_GC defaults to blocked on PPC? */
+ unblock_gc_signals(0,0);
+#endif
function = th->no_tls_value_marker;
th->no_tls_value_marker = NO_TLS_VALUE_MARKER_WIDETAG;
if(arch_os_thread_init(th)==0) return 1;
+ link_thread(th);
+ th->os_thread=thread_self();
+#ifndef LISP_FEATURE_WIN32
+ protect_control_stack_hard_guard_page(1, NULL);
+#endif
+ protect_binding_stack_hard_guard_page(1, NULL);
+ protect_alien_stack_hard_guard_page(1, NULL);
+#ifndef LISP_FEATURE_WIN32
+ protect_control_stack_guard_page(1, NULL);
+#endif
+ protect_binding_stack_guard_page(1, NULL);
+ protect_alien_stack_guard_page(1, NULL);
- if(th->os_thread < 1) lose("th->os_thread not set up right");
- th->state=STATE_RUNNING;
#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
return call_into_lisp_first_time(function,args,0);
#else
#ifdef LISP_FEATURE_SB_THREAD
+# if defined(IMMEDIATE_POST_MORTEM)
+
+/*
+ * If this feature is set, we are running on a stack managed by the OS,
+ * and no fancy delays are required for anything. Just do it.
+ */
+static void
+schedule_thread_post_mortem(struct thread *corpse)
+{
+ pthread_detach(pthread_self());
+ gc_assert(!pthread_attr_destroy(corpse->os_attr));
+ free(corpse->os_attr);
+#if defined(LISP_FEATURE_WIN32)
+ os_invalidate_free(corpse->os_address, THREAD_STRUCT_SIZE);
+#else
+ os_invalidate(corpse->os_address, THREAD_STRUCT_SIZE);
+#endif
+}
+
+# else
+
+/* THREAD POST MORTEM CLEANUP
+ *
+ * Memory allocated for the thread stacks cannot be reclaimed while
+ * the thread is still alive, so we need a mechanism for post mortem
+ * cleanups. FIXME: We actually have three, for historical reasons as
+ * the saying goes. Do we really need three? Nikodemus guesses that
+ * not anymore, now that we properly call pthread_attr_destroy before
+ * freeing the stack. */
+
+static struct thread_post_mortem *
+plan_thread_post_mortem(struct thread *corpse)
+{
+ if (corpse) {
+ struct thread_post_mortem *post_mortem = malloc(sizeof(struct thread_post_mortem));
+ gc_assert(post_mortem);
+ post_mortem->os_thread = corpse->os_thread;
+ post_mortem->os_attr = corpse->os_attr;
+ post_mortem->os_address = corpse->os_address;
+#ifdef DELAY_THREAD_POST_MORTEM
+ post_mortem->next = NULL;
+#endif
+ return post_mortem;
+ } else {
+ /* FIXME: When does this happen? */
+ return NULL;
+ }
+}
+
+static void
+perform_thread_post_mortem(struct thread_post_mortem *post_mortem)
+{
+#ifdef CREATE_POST_MORTEM_THREAD
+ pthread_detach(pthread_self());
+#endif
+ if (post_mortem) {
+ gc_assert(!pthread_join(post_mortem->os_thread, NULL));
+ gc_assert(!pthread_attr_destroy(post_mortem->os_attr));
+ free(post_mortem->os_attr);
+ os_invalidate(post_mortem->os_address, THREAD_STRUCT_SIZE);
+ free(post_mortem);
+ }
+}
+
+static void
+schedule_thread_post_mortem(struct thread *corpse)
+{
+ struct thread_post_mortem *post_mortem = NULL;
+ if (corpse) {
+ post_mortem = plan_thread_post_mortem(corpse);
+
+#ifdef DELAY_THREAD_POST_MORTEM
+ pthread_mutex_lock(&thread_post_mortem_lock);
+ /* First stick the new post mortem to the end of the queue. */
+ if (pending_thread_post_mortem) {
+ struct thread_post_mortem *next = pending_thread_post_mortem;
+ while (next->next) {
+ next = next->next;
+ }
+ next->next = post_mortem;
+ } else {
+ pending_thread_post_mortem = post_mortem;
+ }
+ /* Then, if there are enough things in the queue, clean up one
+ * from the head -- or increment the count, and null out the
+ * post_mortem we have. */
+ if (pending_thread_post_mortem_count > DELAY_THREAD_POST_MORTEM) {
+ post_mortem = pending_thread_post_mortem;
+ pending_thread_post_mortem = post_mortem->next;
+ } else {
+ pending_thread_post_mortem_count++;
+ post_mortem = NULL;
+ }
+ pthread_mutex_unlock(&thread_post_mortem_lock);
+ /* Finally run, the cleanup, if any. */
+ perform_thread_post_mortem(post_mortem);
+#elif defined(CREATE_POST_MORTEM_THREAD)
+ gc_assert(!pthread_create(&thread, NULL, perform_thread_post_mortem, post_mortem));
+#else
+ post_mortem = (struct thread_post_mortem *)
+ swap_lispobjs((lispobj *)(void *)&pending_thread_post_mortem,
+ (lispobj)post_mortem);
+ perform_thread_post_mortem(post_mortem);
+#endif
+ }
+}
+
+# endif /* !IMMEDIATE_POST_MORTEM */
+
+/* Note: scribble must be stack-allocated */
+static void
+init_new_thread(struct thread *th, init_thread_data *scribble, int guardp)
+{
+ int lock_ret;
+
+ pthread_setspecific(lisp_thread, (void *)1);
+ if(arch_os_thread_init(th)==0) {
+ /* FIXME: handle error */
+ lose("arch_os_thread_init failed\n");
+ }
+
+ th->os_thread=thread_self();
+ if (guardp)
+ protect_control_stack_guard_page(1, NULL);
+ protect_binding_stack_guard_page(1, NULL);
+ protect_alien_stack_guard_page(1, NULL);
+ /* Since GC can only know about this thread from the all_threads
+ * list and we're just adding this thread to it, there is no
+ * danger of deadlocking even with SIG_STOP_FOR_GC blocked (which
+ * it is not). */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ *th->csp_around_foreign_call = (lispobj)scribble;
+#endif
+ lock_ret = pthread_mutex_lock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+ link_thread(th);
+ lock_ret = pthread_mutex_unlock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+
+ /* Kludge: Changed the order of some steps between the safepoint/
+ * non-safepoint versions of this code. Can we unify this more?
+ */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ gc_state_lock();
+ gc_state_wait(GC_NONE);
+ gc_state_unlock();
+ push_gcing_safety(&scribble->safety);
+#endif
+}
+
+static void
+undo_init_new_thread(struct thread *th, init_thread_data *scribble)
+{
+ int lock_ret;
+
+ /* Kludge: Changed the order of some steps between the safepoint/
+ * non-safepoint versions of this code. Can we unify this more?
+ */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ block_blockable_signals(0, 0);
+ gc_alloc_update_page_tables(BOXED_PAGE_FLAG, &th->alloc_region);
+#if defined(LISP_FEATURE_SB_SAFEPOINT_STRICTLY) && !defined(LISP_FEATURE_WIN32)
+ gc_alloc_update_page_tables(BOXED_PAGE_FLAG, &th->sprof_alloc_region);
+#endif
+ pop_gcing_safety(&scribble->safety);
+ lock_ret = pthread_mutex_lock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+ unlink_thread(th);
+ lock_ret = pthread_mutex_unlock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+#else
+ /* Block GC */
+ block_blockable_signals(0, 0);
+ set_thread_state(th, STATE_DEAD);
+
+ /* SIG_STOP_FOR_GC is blocked and GC might be waiting for this
+ * thread, but since we are already dead it won't wait long. */
+ lock_ret = pthread_mutex_lock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+
+ gc_alloc_update_page_tables(BOXED_PAGE_FLAG, &th->alloc_region);
+#if defined(LISP_FEATURE_SB_SAFEPOINT_STRICTLY) && !defined(LISP_FEATURE_WIN32)
+ gc_alloc_update_page_tables(BOXED_PAGE_FLAG, &th->sprof_alloc_region);
+#endif
+ unlink_thread(th);
+ pthread_mutex_unlock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+#endif
+
+ if(th->tls_cookie>=0) arch_os_thread_cleanup(th);
+#ifndef LISP_FEATURE_SB_SAFEPOINT
+ os_sem_destroy(th->state_sem);
+ os_sem_destroy(th->state_not_running_sem);
+ os_sem_destroy(th->state_not_stopped_sem);
+#endif
+
+#if defined(LISP_FEATURE_WIN32)
+ free((os_vm_address_t)th->interrupt_data);
+#else
+ os_invalidate((os_vm_address_t)th->interrupt_data,
+ (sizeof (struct interrupt_data)));
+#endif
+
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+ mach_lisp_thread_destroy(th);
+#endif
+
+#if defined(LISP_FEATURE_WIN32)
+ int i;
+ for (i = 0; i<
+ (int) (sizeof(th->private_events.events)/
+ sizeof(th->private_events.events[0])); ++i) {
+ CloseHandle(th->private_events.events[i]);
+ }
+ TlsSetValue(OUR_TLS_INDEX,NULL);
+#endif
+
+ /* Undo the association of the current pthread to its `struct thread',
+ * such that we can call arch_os_get_current_thread() later in this
+ * thread and cleanly get back NULL. */
+#ifdef LISP_FEATURE_GCC_TLS
+ current_thread = NULL;
+#else
+ pthread_setspecific(specials, NULL);
+#endif
+
+ schedule_thread_post_mortem(th);
+}
+
/* this is the first thing that runs in the child (which is why the
* silly calling convention). Basically it calls the user's requested
* lisp function after doing arch_os_thread_init and whatever other
int
new_thread_trampoline(struct thread *th)
{
- lispobj function;
int result;
- function = th->no_tls_value_marker;
- th->no_tls_value_marker = NO_TLS_VALUE_MARKER_WIDETAG;
- if(arch_os_thread_init(th)==0) {
- /* FIXME: handle error */
- lose("arch_os_thread_init failed\n");
- }
+ init_thread_data scribble;
- /* wait here until our thread is linked into all_threads: see below */
- {
- volatile os_thread_t *tid=&th->os_thread;
- while(*tid<1) sched_yield();
- }
+ FSHOW((stderr,"/creating thread %lu\n", thread_self()));
+ check_deferrables_blocked_or_lose(0);
+#ifndef LISP_FEATURE_SB_SAFEPOINT
+ check_gc_signals_unblocked_or_lose(0);
+#endif
- th->state=STATE_RUNNING;
+ lispobj function = th->no_tls_value_marker;
+ th->no_tls_value_marker = NO_TLS_VALUE_MARKER_WIDETAG;
+ init_new_thread(th, &scribble, 1);
result = funcall0(function);
- th->state=STATE_DEAD;
+ undo_init_new_thread(th, &scribble);
+
+ FSHOW((stderr,"/exiting thread %lu\n", thread_self()));
return result;
}
-#endif /* LISP_FEATURE_SB_THREAD */
-#define THREAD_STRUCT_SIZE (THREAD_CONTROL_STACK_SIZE + BINDING_STACK_SIZE + \
- ALIEN_STACK_SIZE + dynamic_values_bytes + \
- 32 * SIGSTKSZ)
+# ifdef LISP_FEATURE_SB_SAFEPOINT
+static struct thread *create_thread_struct(lispobj);
+
+void
+attach_os_thread(init_thread_data *scribble)
+{
+ os_thread_t os = pthread_self();
+ odxprint(misc, "attach_os_thread: attaching to %p", os);
+
+ struct thread *th = create_thread_struct(NIL);
+ block_deferrable_signals(0, &scribble->oldset);
+ th->no_tls_value_marker = NO_TLS_VALUE_MARKER_WIDETAG;
+ /* We don't actually want a pthread_attr here, but rather than add
+ * `if's to the post-mostem, let's just keep that code happy by
+ * keeping it initialized: */
+ pthread_attr_init(th->os_attr);
+
+#ifndef LISP_FEATURE_WIN32
+ /* On windows, arch_os_thread_init will take care of finding the
+ * stack. */
+ pthread_attr_t attr;
+ int pthread_getattr_np(pthread_t, pthread_attr_t *);
+ pthread_getattr_np(os, &attr);
+ void *stack_addr;
+ size_t stack_size;
+ pthread_attr_getstack(&attr, &stack_addr, &stack_size);
+ th->control_stack_start = stack_addr;
+ th->control_stack_end = (void *) (((uintptr_t) stack_addr) + stack_size);
+#endif
+
+ init_new_thread(th, scribble, 0);
+
+ /* We will be calling into Lisp soon, and the functions being called
+ * recklessly ignore the comment in target-thread which says that we
+ * must be careful to not cause GC while initializing a new thread.
+ * Since we first need to create a fresh thread object, it's really
+ * tempting to just perform such unsafe allocation though. So let's
+ * at least try to suppress GC before consing, and hope that it
+ * works: */
+ bind_variable(GC_INHIBIT, T, th);
+
+ uword_t stacksize
+ = (uword_t) th->control_stack_end - (uword_t) th->control_stack_start;
+ odxprint(misc, "attach_os_thread: attached %p as %p (0x%lx bytes stack)",
+ os, th, (long) stacksize);
+}
+
+void
+detach_os_thread(init_thread_data *scribble)
+{
+ struct thread *th = arch_os_get_current_thread();
+ odxprint(misc, "detach_os_thread: detaching");
+
+ undo_init_new_thread(th, scribble);
+
+ odxprint(misc, "deattach_os_thread: detached");
+ pthread_setspecific(lisp_thread, (void *)0);
+ thread_sigmask(SIG_SETMASK, &scribble->oldset, 0);
+}
+# endif /* safepoint */
+
+#endif /* LISP_FEATURE_SB_THREAD */
static void
free_thread_struct(struct thread *th)
{
+#if defined(LISP_FEATURE_WIN32)
+ if (th->interrupt_data) {
+ os_invalidate_free((os_vm_address_t) th->interrupt_data,
+ (sizeof (struct interrupt_data)));
+ }
+ os_invalidate_free((os_vm_address_t) th->os_address,
+ THREAD_STRUCT_SIZE);
+#else
if (th->interrupt_data)
os_invalidate((os_vm_address_t) th->interrupt_data,
(sizeof (struct interrupt_data)));
- os_invalidate((os_vm_address_t) th->control_stack_start,
+ os_invalidate((os_vm_address_t) th->os_address,
THREAD_STRUCT_SIZE);
+#endif
}
+#ifdef LISP_FEATURE_SB_THREAD
+/* FIXME: should be MAX_INTERRUPTS -1 ? */
+const unsigned int tls_index_start =
+ MAX_INTERRUPTS + sizeof(struct thread)/sizeof(lispobj);
+#endif
+
/* this is called from any other thread to create the new one, and
* initialize all parts of it that can be initialized from another
* thread
union per_thread_data *per_thread;
struct thread *th=0; /* subdue gcc */
void *spaces=0;
+ void *aligned_spaces=0;
+#if defined(LISP_FEATURE_SB_THREAD) || defined(LISP_FEATURE_WIN32)
+ unsigned int i;
+#endif
- /* may as well allocate all the spaces at once: it saves us from
+ /* May as well allocate all the spaces at once: it saves us from
* having to decide what to do if only some of the allocations
- * succeed */
+ * succeed. SPACES must be appropriately aligned, since the GC
+ * expects the control stack to start at a page boundary -- and
+ * the OS may have even more rigorous requirements. We can't rely
+ * on the alignment passed from os_validate, since that might
+ * assume the current (e.g. 4k) pagesize, while we calculate with
+ * the biggest (e.g. 64k) pagesize allowed by the ABI. */
spaces=os_validate(0, THREAD_STRUCT_SIZE);
if(!spaces)
- return NULL;
- per_thread=(union per_thread_data *)
- (spaces+
- THREAD_CONTROL_STACK_SIZE+
+ return NULL;
+ /* Aligning up is safe as THREAD_STRUCT_SIZE has
+ * THREAD_ALIGNMENT_BYTES padding. */
+ aligned_spaces = (void *)((((uword_t)(char *)spaces)
+ + THREAD_ALIGNMENT_BYTES-1)
+ &~(uword_t)(THREAD_ALIGNMENT_BYTES-1));
+ void* csp_page=
+ (aligned_spaces+
+ thread_control_stack_size+
BINDING_STACK_SIZE+
ALIEN_STACK_SIZE);
+ per_thread=(union per_thread_data *)
+ (csp_page + THREAD_CSP_PAGE_SIZE);
+ struct nonpointer_thread_data *nonpointer_data
+ = (void *) &per_thread->dynamic_values[TLS_SIZE];
- if(all_threads) {
- memcpy(per_thread,arch_os_get_current_thread(),
- dynamic_values_bytes);
- } else {
#ifdef LISP_FEATURE_SB_THREAD
- int i;
- for(i=0;i<(dynamic_values_bytes/sizeof(lispobj));i++)
- per_thread->dynamic_values[i]=NO_TLS_VALUE_MARKER_WIDETAG;
+ for(i = 0; i < (dynamic_values_bytes / sizeof(lispobj)); i++)
+ per_thread->dynamic_values[i] = NO_TLS_VALUE_MARKER_WIDETAG;
+ if (all_threads == 0) {
if(SymbolValue(FREE_TLS_INDEX,0)==UNBOUND_MARKER_WIDETAG) {
- SetSymbolValue
- (FREE_TLS_INDEX,
- make_fixnum(MAX_INTERRUPTS+
- sizeof(struct thread)/sizeof(lispobj)),
- 0);
+ SetSymbolValue(FREE_TLS_INDEX,tls_index_start << WORD_SHIFT,0);
SetSymbolValue(TLS_INDEX_LOCK,make_fixnum(0),0);
}
#define STATIC_TLS_INIT(sym,field) \
((struct symbol *)(sym-OTHER_POINTER_LOWTAG))->tls_index= \
- make_fixnum(THREAD_SLOT_OFFSET_WORDS(field))
+ (THREAD_SLOT_OFFSET_WORDS(field) << WORD_SHIFT)
STATIC_TLS_INIT(BINDING_STACK_START,binding_stack_start);
+#ifdef BINDING_STACK_POINTER
STATIC_TLS_INIT(BINDING_STACK_POINTER,binding_stack_pointer);
+#endif
STATIC_TLS_INIT(CONTROL_STACK_START,control_stack_start);
STATIC_TLS_INIT(CONTROL_STACK_END,control_stack_end);
+#ifdef ALIEN_STACK
STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
+#endif
#if defined(LISP_FEATURE_X86) || defined (LISP_FEATURE_X86_64)
- STATIC_TLS_INIT(PSEUDO_ATOMIC_ATOMIC,pseudo_atomic_atomic);
- STATIC_TLS_INIT(PSEUDO_ATOMIC_INTERRUPTED,pseudo_atomic_interrupted);
+ STATIC_TLS_INIT(PSEUDO_ATOMIC_BITS,pseudo_atomic_bits);
#endif
#undef STATIC_TLS_INIT
-#endif
}
+#endif
th=&per_thread->thread;
- th->control_stack_start = spaces;
+ th->os_address = spaces;
+ th->control_stack_start = aligned_spaces;
th->binding_stack_start=
- (lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
+ (lispobj*)((void*)th->control_stack_start+thread_control_stack_size);
th->control_stack_end = th->binding_stack_start;
+ th->control_stack_guard_page_protected = T;
th->alien_stack_start=
(lispobj*)((void*)th->binding_stack_start+BINDING_STACK_SIZE);
- th->binding_stack_pointer=th->binding_stack_start;
+ set_binding_stack_pointer(th,th->binding_stack_start);
th->this=th;
th->os_thread=0;
- th->interrupt_fun=NIL;
- th->interrupt_fun_lock=0;
- th->state=STATE_STARTING;
+
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+# ifdef LISP_FEATURE_WIN32
+ th->carried_base_pointer = 0;
+# endif
+# ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
+ th->pc_around_foreign_call = 0;
+# endif
+ th->csp_around_foreign_call = csp_page;
+#endif
+
+#ifdef LISP_FEATURE_SB_THREAD
+ /* Contrary to the "allocate all the spaces at once" comment above,
+ * the os_attr is allocated separately. We cannot put it into the
+ * nonpointer data, because it's used for post_mortem and freed
+ * separately */
+ th->os_attr=malloc(sizeof(pthread_attr_t));
+ th->nonpointer_data = nonpointer_data;
+# ifndef LISP_FEATURE_SB_SAFEPOINT
+ th->state_sem=&nonpointer_data->state_sem;
+ th->state_not_running_sem=&nonpointer_data->state_not_running_sem;
+ th->state_not_stopped_sem=&nonpointer_data->state_not_stopped_sem;
+ os_sem_init(th->state_sem, 1);
+ os_sem_init(th->state_not_running_sem, 0);
+ os_sem_init(th->state_not_stopped_sem, 0);
+# endif
+ th->state_not_running_waitcount = 0;
+ th->state_not_stopped_waitcount = 0;
+#endif
+ th->state=STATE_RUNNING;
#ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
th->alien_stack_pointer=((void *)th->alien_stack_start
+ ALIEN_STACK_SIZE-N_WORD_BYTES);
#else
th->alien_stack_pointer=((void *)th->alien_stack_start);
#endif
-#if defined(LISP_FEATURE_X86) || defined (LISP_FEATURE_X86_64)
- th->pseudo_atomic_interrupted=0;
- th->pseudo_atomic_atomic=0;
+#if defined(LISP_FEATURE_X86) || defined (LISP_FEATURE_X86_64) || defined(LISP_FEATURE_SB_THREAD)
+ th->pseudo_atomic_bits=0;
#endif
#ifdef LISP_FEATURE_GENCGC
gc_set_region_empty(&th->alloc_region);
+# if defined(LISP_FEATURE_SB_SAFEPOINT_STRICTLY) && !defined(LISP_FEATURE_WIN32)
+ gc_set_region_empty(&th->sprof_alloc_region);
+# endif
+#endif
+#ifdef LISP_FEATURE_SB_THREAD
+ /* This parallels the same logic in globals.c for the
+ * single-threaded foreign_function_call_active, KLUDGE and
+ * all. */
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+ th->foreign_function_call_active = 0;
+#else
+ th->foreign_function_call_active = 1;
+#endif
#endif
#ifndef LISP_FEATURE_SB_THREAD
SetSymbolValue(CONTROL_STACK_START,(lispobj)th->control_stack_start,th);
SetSymbolValue(CONTROL_STACK_END,(lispobj)th->control_stack_end,th);
#if defined(LISP_FEATURE_X86) || defined (LISP_FEATURE_X86_64)
- SetSymbolValue(BINDING_STACK_POINTER,(lispobj)th->binding_stack_pointer,th);
SetSymbolValue(ALIEN_STACK,(lispobj)th->alien_stack_pointer,th);
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,(lispobj)th->pseudo_atomic_atomic,th);
- SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,th->pseudo_atomic_interrupted,th);
-#else
- current_binding_stack_pointer=th->binding_stack_pointer;
- current_control_stack_pointer=th->control_stack_start;
+ SetSymbolValue(PSEUDO_ATOMIC_BITS,(lispobj)th->pseudo_atomic_bits,th);
#endif
#endif
bind_variable(CURRENT_CATCH_BLOCK,make_fixnum(0),th);
bind_variable(FREE_INTERRUPT_CONTEXT_INDEX,make_fixnum(0),th);
bind_variable(INTERRUPT_PENDING, NIL,th);
bind_variable(INTERRUPTS_ENABLED,T,th);
+ bind_variable(ALLOW_WITH_INTERRUPTS,T,th);
bind_variable(GC_PENDING,NIL,th);
+ bind_variable(ALLOC_SIGNAL,NIL,th);
+#ifdef PINNED_OBJECTS
+ bind_variable(PINNED_OBJECTS,NIL,th);
+#endif
#ifdef LISP_FEATURE_SB_THREAD
bind_variable(STOP_FOR_GC_PENDING,NIL,th);
#endif
+#if defined(LISP_FEATURE_SB_SAFEPOINT)
+ bind_variable(GC_SAFE,NIL,th);
+ bind_variable(IN_SAFEPOINT,NIL,th);
+#endif
+#ifdef LISP_FEATURE_SB_THRUPTION
+ bind_variable(THRUPTION_PENDING,NIL,th);
+ bind_variable(RESTART_CLUSTERS,NIL,th);
+#endif
+#ifndef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
+ access_control_stack_pointer(th)=th->control_stack_start;
+#endif
+#if defined(LISP_FEATURE_WIN32)
+ th->interrupt_data = (struct interrupt_data *)
+ calloc((sizeof (struct interrupt_data)),1);
+#else
th->interrupt_data = (struct interrupt_data *)
os_validate(0,(sizeof (struct interrupt_data)));
+#endif
if (!th->interrupt_data) {
free_thread_struct(th);
return 0;
}
th->interrupt_data->pending_handler = 0;
+ th->interrupt_data->gc_blocked_deferrables = 0;
+#ifdef GENCGC_IS_PRECISE
+ th->interrupt_data->allocation_trap_context = 0;
+#endif
th->no_tls_value_marker=initial_function;
- return th;
-}
-static void
-link_thread(struct thread *th,os_thread_t kid_tid)
-{
- if (all_threads) all_threads->prev=th;
- th->next=all_threads;
- th->prev=0;
- all_threads=th;
- /* note that th->os_thread is 0 at this time. We rely on
- * all_threads_lock to ensure that we don't have >1 thread with
- * os_thread=0 on the list at once
- */
- protect_control_stack_guard_page(th,1);
- /* child will not start until this is set */
- th->os_thread=kid_tid;
- FSHOW((stderr,"/created thread %lu\n",kid_tid));
+#if defined(LISP_FEATURE_WIN32)
+ for (i = 0; i<sizeof(th->private_events.events)/
+ sizeof(th->private_events.events[0]); ++i) {
+ th->private_events.events[i] = CreateEvent(NULL,FALSE,FALSE,NULL);
+ }
+ th->synchronous_io_handle_and_flag = 0;
+#endif
+ th->stepping = NIL;
+ return th;
}
void create_initial_thread(lispobj initial_function) {
struct thread *th=create_thread_struct(initial_function);
- os_thread_t kid_tid=thread_self();
- if(th && kid_tid>0) {
- link_thread(th,kid_tid);
- initial_thread_trampoline(all_threads); /* no return */
- } else lose("can't create initial thread");
+#ifdef LISP_FEATURE_SB_THREAD
+ pthread_key_create(&lisp_thread, 0);
+#endif
+ if(th) {
+ initial_thread_trampoline(th); /* no return */
+ } else lose("can't create initial thread\n");
}
#ifdef LISP_FEATURE_SB_THREAD
{
/* The new thread inherits the restrictive signal mask set here,
* and enables signals again when it is set up properly. */
- pthread_attr_t attr;
- sigset_t newset,oldset;
+ sigset_t oldset;
boolean r=1;
- sigemptyset(&newset);
- /* Blocking deferrable signals is enough, since gc_stop_the_world
- * waits until the child leaves STATE_STARTING. And why not let gc
- * proceed as soon as possible? */
- sigaddset_deferrable(&newset);
- thread_sigmask(SIG_BLOCK, &newset, &oldset);
-
- if((pthread_attr_init(&attr)) ||
- (pthread_attr_setstack(&attr,th->control_stack_start,
- THREAD_CONTROL_STACK_SIZE-16)) ||
- (pthread_create
- (kid_tid,&attr,(void *(*)(void *))new_thread_trampoline,th)))
- r=0;
- thread_sigmask(SIG_SETMASK,&oldset,0);
- return r;
-}
-
-struct thread *create_thread(lispobj initial_function) {
- struct thread *th;
- os_thread_t kid_tid=0;
- boolean success;
-
- if(linux_no_threads_p) return 0;
+ int retcode = 0, initcode;
- th=create_thread_struct(initial_function);
- if(th==0) return 0;
+ FSHOW_SIGNAL((stderr,"/create_os_thread: creating new thread\n"));
- /* we must not be interrupted here after a successful
- * create_os_thread, because the kid will be waiting for its
- * thread struct to be linked */
- GET_ALL_THREADS_LOCK("create_thread")
-
- success=create_os_thread(th,&kid_tid);
- if (success)
- link_thread(th,kid_tid);
- else
- free_thread_struct(th);
-
- RELEASE_ALL_THREADS_LOCK("create_thread")
-
- if (success)
- return th;
- else
- return 0;
-}
+ /* Blocking deferrable signals is enough, no need to block
+ * SIG_STOP_FOR_GC because the child process is not linked onto
+ * all_threads until it's ready. */
+ block_deferrable_signals(0, &oldset);
-/* called from lisp from the thread object finalizer */
-void reap_dead_thread(struct thread *th)
-{
- if(th->state!=STATE_DEAD)
- lose("thread %p is not joinable, state=%d\n",th,th->state);
-#ifdef LISP_FEATURE_GENCGC
- {
- sigset_t newset,oldset;
- sigemptyset(&newset);
- sigaddset_blockable(&newset);
- thread_sigmask(SIG_BLOCK, &newset, &oldset);
- gc_alloc_update_page_tables(0, &th->alloc_region);
- thread_sigmask(SIG_SETMASK,&oldset,0);
- }
+#ifdef LOCK_CREATE_THREAD
+ retcode = pthread_mutex_lock(&create_thread_lock);
+ gc_assert(retcode == 0);
+ FSHOW_SIGNAL((stderr,"/create_os_thread: got lock\n"));
#endif
- GET_ALL_THREADS_LOCK("reap_dead_thread")
- FSHOW((stderr,"/reap_dead_thread: reaping %lu\n",th->os_thread));
- if(th->prev)
- th->prev->next=th->next;
- else all_threads=th->next;
- if(th->next)
- th->next->prev=th->prev;
- RELEASE_ALL_THREADS_LOCK("reap_dead_thread")
- if(th->tls_cookie>=0) arch_os_thread_cleanup(th);
- gc_assert(pthread_join(th->os_thread,NULL)==0);
- free_thread_struct(th);
-}
-/* Send the signo to os_thread, retry if the rt signal queue is
- * full. */
-static int kill_thread_safely(os_thread_t os_thread, int signo)
-{
- int r;
- /* The man page does not mention EAGAIN as a valid return value
- * for either pthread_kill or kill. But that's theory, this is
- * practice. By waiting here we assume that the delivery of this
- * signal is not necessary for the delivery of the signals in the
- * queue. In other words, we _assume_ there are no deadlocks. */
- while ((r=pthread_kill(os_thread,signo))==EAGAIN) {
- /* wait a bit then try again in the hope of the rt signal
- * queue not being full */
- FSHOW_SIGNAL((stderr,"/rt signal queue full\n"));
- /* FIXME: some kind of backoff (random, exponential) would be
- * nice. */
- sleep(1);
+ if((initcode = pthread_attr_init(th->os_attr)) ||
+ /* call_into_lisp_first_time switches the stack for the initial
+ * thread. For the others, we use this. */
+#if defined(LISP_FEATURE_WIN32)
+ (pthread_attr_setstacksize(th->os_attr, thread_control_stack_size)) ||
+#else
+# if defined(LISP_FEATURE_C_STACK_IS_CONTROL_STACK)
+ (pthread_attr_setstack(th->os_attr,th->control_stack_start,
+ thread_control_stack_size)) ||
+# else
+ (pthread_attr_setstack(th->os_attr,th->alien_stack_start,
+ ALIEN_STACK_SIZE)) ||
+# endif
+#endif
+ (retcode = pthread_create
+ (kid_tid,th->os_attr,(void *(*)(void *))new_thread_trampoline,th))) {
+ FSHOW_SIGNAL((stderr, "init = %d\n", initcode));
+ FSHOW_SIGNAL((stderr, "pthread_create returned %d, errno %d\n",
+ retcode, errno));
+ if(retcode < 0) {
+ perror("create_os_thread");
+ }
+ r=0;
}
+
+#ifdef LOCK_CREATE_THREAD
+ retcode = pthread_mutex_unlock(&create_thread_lock);
+ gc_assert(retcode == 0);
+ FSHOW_SIGNAL((stderr,"/create_os_thread: released lock\n"));
+#endif
+ thread_sigmask(SIG_SETMASK,&oldset,0);
return r;
}
-int interrupt_thread(struct thread *th, lispobj function)
-{
- /* In clone_threads, if A and B both interrupt C at approximately
- * the same time, it does not matter: the second signal will be
- * masked until the handler has returned from the first one. In
- * pthreads though, we can't put the knowledge of what function to
- * call into the siginfo, so we have to store it in the
- * destination thread, and do it in such a way that A won't
- * clobber B's interrupt. Hence, this stupid linked list.
- *
- * This does depend on SIG_INTERRUPT_THREAD being queued (as POSIX
- * RT signals are): we need to keep interrupt_fun data for exactly
- * as many signals as are going to be received by the destination
- * thread.
- */
- lispobj c=alloc_cons(function,NIL);
- sigset_t newset,oldset;
- sigemptyset(&newset);
- /* interrupt_thread_handler locks this spinlock with blockables
- * blocked (it does so for the sake of
- * arrange_return_to_lisp_function), so we must also block them or
- * else SIG_STOP_FOR_GC and all_threads_lock will find a way to
- * deadlock. */
- sigaddset_blockable(&newset);
- thread_sigmask(SIG_BLOCK, &newset, &oldset);
- if (th == arch_os_get_current_thread())
- lose("cannot interrupt current thread");
- get_spinlock(&th->interrupt_fun_lock,
- (long)arch_os_get_current_thread());
- ((struct cons *)native_pointer(c))->cdr=th->interrupt_fun;
- th->interrupt_fun=c;
- release_spinlock(&th->interrupt_fun_lock);
- thread_sigmask(SIG_SETMASK,&oldset,0);
- /* Called from lisp with the thread object as a parameter. Thus,
- * the object cannot be garbage collected and consequently reaped
- * and joined. Because it's not joined, kill should work (even if
- * the thread has died/exited). */
- {
- int status=kill_thread_safely(th->os_thread,SIG_INTERRUPT_THREAD);
- if (status==0) {
- return 0;
- } else if (status==ESRCH) {
- /* This thread has exited. */
- th->interrupt_fun=NIL;
- errno=ESRCH;
- return -1;
- } else {
- lose("cannot send SIG_INTERRUPT_THREAD to thread=%lu: %d, %s",
- th->os_thread,status,strerror(status));
- }
+os_thread_t create_thread(lispobj initial_function) {
+ struct thread *th, *thread = arch_os_get_current_thread();
+ os_thread_t kid_tid = 0;
+
+ /* Must defend against async unwinds. */
+ if (SymbolValue(INTERRUPTS_ENABLED, thread) != NIL)
+ lose("create_thread is not safe when interrupts are enabled.\n");
+
+ /* Assuming that a fresh thread struct has no lisp objects in it,
+ * linking it to all_threads can be left to the thread itself
+ * without fear of gc lossage. initial_function violates this
+ * assumption and must stay pinned until the child starts up. */
+ th = create_thread_struct(initial_function);
+ if (th && !create_os_thread(th,&kid_tid)) {
+ free_thread_struct(th);
+ kid_tid = 0;
}
+ return kid_tid;
}
/* stopping the world is a two-stage process. From this thread we signal
* the usual pseudo-atomic checks (we don't want to stop a thread while
* it's in the middle of allocation) then waits for another SIG_STOP_FOR_GC.
*/
+/*
+ * (With SB-SAFEPOINT, see the definitions in safepoint.c instead.)
+ */
+#ifndef LISP_FEATURE_SB_SAFEPOINT
/* To avoid deadlocks when gc stops the world all clients of each
* mutex must enable or disable SIG_STOP_FOR_GC for the duration of
void gc_stop_the_world()
{
struct thread *p,*th=arch_os_get_current_thread();
- int status;
- FSHOW_SIGNAL((stderr,"/gc_stop_the_world:waiting on lock, thread=%lu\n",
- th->os_thread));
+ int status, lock_ret;
+#ifdef LOCK_CREATE_THREAD
+ /* KLUDGE: Stopping the thread during pthread_create() causes deadlock
+ * on FreeBSD. */
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world:waiting on create_thread_lock\n"));
+ lock_ret = pthread_mutex_lock(&create_thread_lock);
+ gc_assert(lock_ret == 0);
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world:got create_thread_lock\n"));
+#endif
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world:waiting on lock\n"));
/* keep threads from starting while the world is stopped. */
- pthread_mutex_lock(&all_threads_lock); \
- FSHOW_SIGNAL((stderr,"/gc_stop_the_world:got lock, thread=%lu\n",
- th->os_thread));
+ lock_ret = pthread_mutex_lock(&all_threads_lock); \
+ gc_assert(lock_ret == 0);
+
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world:got lock\n"));
/* stop all other threads by sending them SIG_STOP_FOR_GC */
for(p=all_threads; p; p=p->next) {
- while(p->state==STATE_STARTING) sched_yield();
- if((p!=th) && (p->state==STATE_RUNNING)) {
- FSHOW_SIGNAL((stderr,"/gc_stop_the_world: suspending %lu\n",
+ gc_assert(p->os_thread != 0);
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world: thread=%lu, state=%x\n",
+ p->os_thread, thread_state(p)));
+ if((p!=th) && ((thread_state(p)==STATE_RUNNING))) {
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world: suspending thread %lu\n",
p->os_thread));
- status=kill_thread_safely(p->os_thread,SIG_STOP_FOR_GC);
+ /* We already hold all_thread_lock, P can become DEAD but
+ * cannot exit, ergo it's safe to use pthread_kill. */
+ status=pthread_kill(p->os_thread,SIG_STOP_FOR_GC);
if (status==ESRCH) {
/* This thread has exited. */
- gc_assert(p->state==STATE_DEAD);
+ gc_assert(thread_state(p)==STATE_DEAD);
} else if (status) {
- lose("cannot send suspend thread=%lu: %d, %s",
+ lose("cannot send suspend thread=%lu: %d, %s\n",
p->os_thread,status,strerror(status));
}
}
}
FSHOW_SIGNAL((stderr,"/gc_stop_the_world:signals sent\n"));
- /* wait for the running threads to stop or finish */
- for(p=all_threads;p;) {
- gc_assert(p->os_thread!=0);
- gc_assert(p->state!=STATE_STARTING);
- if((p==th) || (p->state==STATE_SUSPENDED) ||
- (p->state==STATE_DEAD)) {
- p=p->next;
- } else {
- sched_yield();
+ for(p=all_threads;p;p=p->next) {
+ if (p!=th) {
+ FSHOW_SIGNAL
+ ((stderr,
+ "/gc_stop_the_world: waiting for thread=%lu: state=%x\n",
+ p->os_thread, thread_state(p)));
+ wait_for_thread_state_change(p, STATE_RUNNING);
+ if (p->state == STATE_RUNNING)
+ lose("/gc_stop_the_world: unexpected state");
}
}
FSHOW_SIGNAL((stderr,"/gc_stop_the_world:end\n"));
void gc_start_the_world()
{
struct thread *p,*th=arch_os_get_current_thread();
- int status;
+ int lock_ret;
/* if a resumed thread creates a new thread before we're done with
* this loop, the new thread will get consed on the front of
* all_threads, but it won't have been stopped so won't need
FSHOW_SIGNAL((stderr,"/gc_start_the_world:begin\n"));
for(p=all_threads;p;p=p->next) {
gc_assert(p->os_thread!=0);
- if((p!=th) && (p->state!=STATE_DEAD)) {
- if(p->state!=STATE_SUSPENDED) {
- lose("gc_start_the_world: wrong thread state is %d\n",
- fixnum_value(p->state));
- }
- FSHOW_SIGNAL((stderr, "/gc_start_the_world: resuming %lu\n",
- p->os_thread));
- p->state=STATE_RUNNING;
- status=kill_thread_safely(p->os_thread,SIG_STOP_FOR_GC);
- if (status) {
- lose("cannot resume thread=%lu: %d, %s",
- p->os_thread,status,strerror(status));
+ if (p!=th) {
+ lispobj state = thread_state(p);
+ if (state != STATE_DEAD) {
+ if(state != STATE_STOPPED) {
+ lose("gc_start_the_world: wrong thread state is %d\n",
+ fixnum_value(state));
+ }
+ FSHOW_SIGNAL((stderr, "/gc_start_the_world: resuming %lu\n",
+ p->os_thread));
+ set_thread_state(p, STATE_RUNNING);
}
}
}
- /* If we waited here until all threads leave STATE_SUSPENDED, then
- * SIG_STOP_FOR_GC wouldn't need to be a rt signal. That has some
- * performance implications, but does away with the 'rt signal
- * queue full' problem. */
- pthread_mutex_unlock(&all_threads_lock); \
+
+ lock_ret = pthread_mutex_unlock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+#ifdef LOCK_CREATE_THREAD
+ lock_ret = pthread_mutex_unlock(&create_thread_lock);
+ gc_assert(lock_ret == 0);
+#endif
+
FSHOW_SIGNAL((stderr,"/gc_start_the_world:end\n"));
}
+
+#endif /* !LISP_FEATURE_SB_SAFEPOINT */
+#endif /* !LISP_FEATURE_SB_THREAD */
+
+int
+thread_yield()
+{
+#ifdef LISP_FEATURE_SB_THREAD
+ return sched_yield();
+#else
+ return 0;
+#endif
+}
+
+int
+wake_thread(os_thread_t os_thread)
+{
+#if defined(LISP_FEATURE_WIN32)
+ return kill_safely(os_thread, 1);
+#elif !defined(LISP_FEATURE_SB_THRUPTION)
+ return kill_safely(os_thread, SIGPIPE);
+#else
+ return wake_thread_posix(os_thread);
+#endif
+}
+
+/* If the thread id given does not belong to a running thread (it has
+ * exited or never even existed) pthread_kill _may_ fail with ESRCH,
+ * but it is also allowed to just segfault, see
+ * <http://udrepper.livejournal.com/16844.html>.
+ *
+ * Relying on thread ids can easily backfire since ids are recycled
+ * (NPTL recycles them extremely fast) so a signal can be sent to
+ * another process if the one it was sent to exited.
+ *
+ * For these reasons, we must make sure that the thread is still alive
+ * when the pthread_kill is called and return if the thread is
+ * exiting.
+ *
+ * Note (DFL, 2011-06-22): At the time of writing, this function is only
+ * used for INTERRUPT-THREAD, hence the wake_thread special-case for
+ * Windows is OK. */
+int
+kill_safely(os_thread_t os_thread, int signal)
+{
+ FSHOW_SIGNAL((stderr,"/kill_safely: %lu, %d\n", os_thread, signal));
+ {
+#ifdef LISP_FEATURE_SB_THREAD
+ sigset_t oldset;
+ struct thread *thread;
+ /* Frequent special case: resignalling to self. The idea is
+ * that leave_region safepoint will acknowledge the signal, so
+ * there is no need to take locks, roll thread to safepoint
+ * etc. */
+ /* Kludge (on safepoint builds): At the moment, this isn't just
+ * an optimization; rather it masks the fact that
+ * gc_stop_the_world() grabs the all_threads mutex without
+ * releasing it, and since we're not using recursive pthread
+ * mutexes, the pthread_mutex_lock() around the all_threads loop
+ * would go wrong. Why are we running interruptions while
+ * stopping the world though? Test case is (:ASYNC-UNWIND
+ * :SPECIALS), especially with s/10/100/ in both loops. */
+ if (os_thread == pthread_self()) {
+ pthread_kill(os_thread, signal);
+#ifdef LISP_FEATURE_WIN32
+ check_pending_thruptions(NULL);
#endif
+ return 0;
+ }
+
+ /* pthread_kill is not async signal safe and we don't want to be
+ * interrupted while holding the lock. */
+ block_deferrable_signals(0, &oldset);
+ pthread_mutex_lock(&all_threads_lock);
+ for (thread = all_threads; thread; thread = thread->next) {
+ if (thread->os_thread == os_thread) {
+ int status = pthread_kill(os_thread, signal);
+ if (status)
+ lose("kill_safely: pthread_kill failed with %d\n", status);
+#if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THRUPTION)
+ wake_thread_win32(thread);
+#endif
+ break;
+ }
+ }
+ pthread_mutex_unlock(&all_threads_lock);
+ thread_sigmask(SIG_SETMASK,&oldset,0);
+ if (thread)
+ return 0;
+ else
+ return -1;
+#elif defined(LISP_FEATURE_WIN32)
+ return 0;
+#else
+ int status;
+ if (os_thread != 0)
+ lose("kill_safely: who do you want to kill? %d?\n", os_thread);
+ /* Dubious (as in don't know why it works) workaround for the
+ * signal sometimes not being generated on darwin. */
+#ifdef LISP_FEATURE_DARWIN
+ {
+ sigset_t oldset;
+ sigprocmask(SIG_BLOCK, &deferrable_sigset, &oldset);
+ status = raise(signal);
+ sigprocmask(SIG_SETMASK,&oldset,0);
+ }
+#else
+ status = raise(signal);
+#endif
+ if (status == 0) {
+ return 0;
+ } else {
+ lose("cannot raise signal %d, %d %s\n",
+ signal, status, strerror(errno));
+ }
+#endif
+ }
+}
projects / sbcl.git / blobdiff