+/*
+ * 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>
+#endif
#include <signal.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 "interr.h" /* for lose() */
#include "gc-internal.h"
+#ifdef LISP_FEATURE_WIN32
+/*
+ * Win32 doesn't have SIGSTKSZ, and we're not switching stacks anyway,
+ * so define it arbitrarily
+ */
+#define SIGSTKSZ 1024
+#endif
+
+#if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_SB_THREAD)
+#define QUEUE_FREEABLE_THREAD_STACKS
+#define LOCK_CREATE_THREAD
+#endif
+
+#ifdef LISP_FEATURE_FREEBSD
+#define CREATE_CLEANUP_THREAD
+#define LOCK_CREATE_THREAD
+#endif
+
#define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */
+struct freeable_stack {
+#ifdef QUEUE_FREEABLE_THREAD_STACKS
+ struct freeable_stack *next;
+#endif
+ os_thread_t os_thread;
+ os_vm_address_t stack;
+};
+
+
+#ifdef QUEUE_FREEABLE_THREAD_STACKS
+static struct freeable_stack * volatile freeable_stack_queue = 0;
+static int freeable_stack_count = 0;
+pthread_mutex_t freeable_stack_lock = PTHREAD_MUTEX_INITIALIZER;
+#else
+static struct freeable_stack * volatile freeable_stack = 0;
+#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;
#ifdef LISP_FEATURE_SB_THREAD
-
pthread_mutex_t all_threads_lock = PTHREAD_MUTEX_INITIALIZER;
-
-/* 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()
-{
- /* 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");
-}
-
-#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); \
- }
+#ifdef LOCK_CREATE_THREAD
+static pthread_mutex_t create_thread_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
#endif
-
#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
extern lispobj call_into_lisp_first_time(lispobj fun, lispobj *args, int nargs);
#endif
+static void
+link_thread(struct thread *th)
+{
+ if (all_threads) all_threads->prev=th;
+ th->next=all_threads;
+ th->prev=0;
+ all_threads=th;
+}
+
+#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;
+}
+#endif
+
static int
initial_thread_trampoline(struct thread *th)
{
#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
lispobj *args = NULL;
#endif
- function = th->unbound_marker;
- th->unbound_marker = UNBOUND_MARKER_WIDETAG;
+ 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_guard_page(1);
+#endif
- 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
#endif
}
+#define THREAD_STRUCT_SIZE (THREAD_CONTROL_STACK_SIZE + BINDING_STACK_SIZE + \
+ ALIEN_STACK_SIZE + dynamic_values_bytes + \
+ 32 * SIGSTKSZ)
+
#ifdef LISP_FEATURE_SB_THREAD
+#ifdef QUEUE_FREEABLE_THREAD_STACKS
+
+static void
+queue_freeable_thread_stack(struct thread *thread_to_be_cleaned_up)
+{
+ if (thread_to_be_cleaned_up) {
+ pthread_mutex_lock(&freeable_stack_lock);
+ if (freeable_stack_queue) {
+ struct freeable_stack *new_freeable_stack = 0, *next;
+ next = freeable_stack_queue;
+ while (next->next) {
+ next = next->next;
+ }
+ new_freeable_stack = (struct freeable_stack *)
+ os_validate(0, sizeof(struct freeable_stack));
+ new_freeable_stack->next = NULL;
+ new_freeable_stack->os_thread = thread_to_be_cleaned_up->os_thread;
+ new_freeable_stack->stack = (os_vm_address_t)
+ thread_to_be_cleaned_up->control_stack_start;
+ next->next = new_freeable_stack;
+ freeable_stack_count++;
+ } else {
+ struct freeable_stack *new_freeable_stack = 0;
+ new_freeable_stack = (struct freeable_stack *)
+ os_validate(0, sizeof(struct freeable_stack));
+ new_freeable_stack->next = NULL;
+ new_freeable_stack->os_thread = thread_to_be_cleaned_up->os_thread;
+ new_freeable_stack->stack = (os_vm_address_t)
+ thread_to_be_cleaned_up->control_stack_start;
+ freeable_stack_queue = new_freeable_stack;
+ freeable_stack_count++;
+ }
+ pthread_mutex_unlock(&freeable_stack_lock);
+ }
+}
+
+#define FREEABLE_STACK_QUEUE_SIZE 4
+
+static void
+free_freeable_stacks() {
+ if (freeable_stack_queue && (freeable_stack_count > FREEABLE_STACK_QUEUE_SIZE)) {
+ struct freeable_stack* old;
+ pthread_mutex_lock(&freeable_stack_lock);
+ old = freeable_stack_queue;
+ freeable_stack_queue = old->next;
+ freeable_stack_count--;
+ gc_assert(pthread_join(old->os_thread, NULL) == 0);
+ FSHOW((stderr, "freeing thread %x stack\n", old->os_thread));
+ os_invalidate(old->stack, THREAD_STRUCT_SIZE);
+ os_invalidate((os_vm_address_t)old, sizeof(struct freeable_stack));
+ pthread_mutex_unlock(&freeable_stack_lock);
+ }
+}
+
+#elif defined(CREATE_CLEANUP_THREAD)
+static void *
+cleanup_thread(void *arg)
+{
+ struct freeable_stack *freeable = arg;
+ pthread_t self = pthread_self();
+
+ FSHOW((stderr, "/cleaner thread(%p): joining %p\n",
+ self, freeable->os_thread));
+ gc_assert(pthread_join(freeable->os_thread, NULL) == 0);
+ FSHOW((stderr, "/cleaner thread(%p): free stack %p\n",
+ self, freeable->stack));
+ os_invalidate(freeable->stack, THREAD_STRUCT_SIZE);
+ free(freeable);
+
+ pthread_detach(self);
+
+ return NULL;
+}
+
+static void
+create_cleanup_thread(struct thread *thread_to_be_cleaned_up)
+{
+ pthread_t thread;
+ int result;
+
+ if (thread_to_be_cleaned_up) {
+ struct freeable_stack *freeable =
+ malloc(sizeof(struct freeable_stack));
+ gc_assert(freeable != NULL);
+ freeable->os_thread = thread_to_be_cleaned_up->os_thread;
+ freeable->stack =
+ (os_vm_address_t) thread_to_be_cleaned_up->control_stack_start;
+ result = pthread_create(&thread, NULL, cleanup_thread, freeable);
+ gc_assert(result == 0);
+ sched_yield();
+ }
+}
+
+#else
+static void
+free_thread_stack_later(struct thread *thread_to_be_cleaned_up)
+{
+ struct freeable_stack *new_freeable_stack = 0;
+ if (thread_to_be_cleaned_up) {
+ new_freeable_stack = (struct freeable_stack *)
+ os_validate(0, sizeof(struct freeable_stack));
+ new_freeable_stack->os_thread = thread_to_be_cleaned_up->os_thread;
+ new_freeable_stack->stack = (os_vm_address_t)
+ thread_to_be_cleaned_up->control_stack_start;
+ }
+ new_freeable_stack = (struct freeable_stack *)
+ swap_lispobjs((lispobj *)(void *)&freeable_stack,
+ (lispobj)new_freeable_stack);
+ if (new_freeable_stack) {
+ FSHOW((stderr,"/reaping %p\n", (void*) new_freeable_stack->os_thread));
+ /* Under NPTL pthread_join really waits until the thread
+ * exists and the stack can be safely freed. This is sadly not
+ * mandated by the pthread spec. */
+ gc_assert(pthread_join(new_freeable_stack->os_thread, NULL) == 0);
+ os_invalidate(new_freeable_stack->stack, THREAD_STRUCT_SIZE);
+ os_invalidate((os_vm_address_t) new_freeable_stack,
+ sizeof(struct freeable_stack));
+ }
+}
+#endif
+
/* 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
new_thread_trampoline(struct thread *th)
{
lispobj function;
- int result;
- function = th->unbound_marker;
- th->unbound_marker = UNBOUND_MARKER_WIDETAG;
+ int result, lock_ret;
+
+ FSHOW((stderr,"/creating thread %lu\n", thread_self()));
+ 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");
}
- /* 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();
- }
+ th->os_thread=thread_self();
+ protect_control_stack_guard_page(1);
+ /* 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). */
+ 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);
- th->state=STATE_RUNNING;
result = funcall0(function);
+
+ /* Block GC */
+ block_blockable_signals();
th->state=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(0, &th->alloc_region);
+ unlink_thread(th);
+ pthread_mutex_unlock(&all_threads_lock);
+ gc_assert(lock_ret == 0);
+
+ if(th->tls_cookie>=0) arch_os_thread_cleanup(th);
+ os_invalidate((os_vm_address_t)th->interrupt_data,
+ (sizeof (struct interrupt_data)));
+
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+ FSHOW((stderr, "Deallocating mach port %x\n", THREAD_STRUCT_TO_EXCEPTION_PORT(th)));
+ mach_port_move_member(mach_task_self(),
+ THREAD_STRUCT_TO_EXCEPTION_PORT(th),
+ MACH_PORT_NULL);
+ mach_port_deallocate(mach_task_self(),
+ THREAD_STRUCT_TO_EXCEPTION_PORT(th));
+ mach_port_destroy(mach_task_self(),
+ THREAD_STRUCT_TO_EXCEPTION_PORT(th));
+#endif
+
+#ifdef QUEUE_FREEABLE_THREAD_STACKS
+ queue_freeable_thread_stack(th);
+#elif defined(CREATE_CLEANUP_THREAD)
+ create_cleanup_thread(th);
+#else
+ free_thread_stack_later(th);
+#endif
+
+ FSHOW((stderr,"/exiting thread %p\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)
+#endif /* LISP_FEATURE_SB_THREAD */
static void
free_thread_struct(struct thread *th)
union per_thread_data *per_thread;
struct thread *th=0; /* subdue gcc */
void *spaces=0;
+#ifdef LISP_FEATURE_SB_THREAD
+ int i;
+#endif
+#ifdef CREATE_CLEANUP_THREAD
+ /* Give a chance for cleanup threads to run. */
+ sched_yield();
+#endif
/* 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 */
BINDING_STACK_SIZE+
ALIEN_STACK_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]=UNBOUND_MARKER_WIDETAG;
- if(SymbolValue(FREE_TLS_INDEX,0)==UNBOUND_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,
+ /* FIXME: should be MAX_INTERRUPTS -1 ? */
make_fixnum(MAX_INTERRUPTS+
sizeof(struct thread)/sizeof(lispobj)),
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))
STATIC_TLS_INIT(CONTROL_STACK_END,control_stack_end);
STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
#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->binding_stack_pointer=th->binding_stack_start;
th->this=th;
th->os_thread=0;
- th->interrupt_fun=NIL;
- th->interrupt_fun_lock=0;
- th->state=STATE_STARTING;
+ 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);
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;
+ th->pseudo_atomic_bits=0;
#endif
#ifdef LISP_FEATURE_GENCGC
gc_set_region_empty(&th->alloc_region);
#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);
+ SetSymbolValue(PSEUDO_ATOMIC_BITS,(lispobj)th->pseudo_atomic_bits,th);
#else
current_binding_stack_pointer=th->binding_stack_pointer;
current_control_stack_pointer=th->control_stack_start;
free_thread_struct(th);
return 0;
}
- if(all_threads)
- memcpy(th->interrupt_data,
- arch_os_get_current_thread()->interrupt_data,
- sizeof (struct interrupt_data));
- else
- memcpy(th->interrupt_data,global_interrupt_data,
- sizeof (struct interrupt_data));
+ th->interrupt_data->pending_handler = 0;
+ th->no_tls_value_marker=initial_function;
- th->unbound_marker=initial_function;
+ th->stepping = NIL;
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));
-}
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+mach_port_t setup_mach_exception_handling_thread();
+kern_return_t mach_thread_init(mach_port_t thread_exception_port);
+
+#endif
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");
+ if(th) {
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+ kern_return_t ret;
+
+ setup_mach_exception_handling_thread();
+#endif
+ initial_thread_trampoline(th); /* no return */
+ } else lose("can't create initial thread\n");
}
#ifdef LISP_FEATURE_SB_THREAD
pthread_attr_t attr;
sigset_t newset,oldset;
boolean r=1;
+ int retcode, initcode, sizecode, addrcode;
+
+ FSHOW_SIGNAL((stderr,"/create_os_thread: creating new thread\n"));
+
+#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
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? */
+ /* 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. */
sigaddset_deferrable(&newset);
thread_sigmask(SIG_BLOCK, &newset, &oldset);
- if((pthread_attr_init(&attr)) ||
+#if defined(LISP_FEATURE_DARWIN)
+#define CONTROL_STACK_ADJUST 8192 /* darwin wants page-aligned stacks */
+#else
+#define CONTROL_STACK_ADJUST 16
+#endif
+
+ if((initcode = pthread_attr_init(&attr)) ||
+ /* FIXME: why do we even have this in the first place? */
(pthread_attr_setstack(&attr,th->control_stack_start,
- THREAD_CONTROL_STACK_SIZE-16)) ||
- (pthread_create
- (kid_tid,&attr,(void *(*)(void *))new_thread_trampoline,th)))
+ THREAD_CONTROL_STACK_SIZE-CONTROL_STACK_ADJUST)) ||
+#undef CONTROL_STACK_ADJUST
+ (retcode = pthread_create
+ (kid_tid,&attr,(void *(*)(void *))new_thread_trampoline,th))) {
+ FSHOW_SIGNAL((stderr, "init, size, addr = %d, %d, %d\n", initcode, sizecode, addrcode));
+ FSHOW_SIGNAL((stderr, printf("pthread_create returned %d, errno %d\n", retcode, errno)));
+ FSHOW_SIGNAL((stderr, "wanted stack size %d, min stack size %d\n",
+ THREAD_CONTROL_STACK_SIZE-16, PTHREAD_STACK_MIN));
+ if(retcode < 0) {
+ perror("create_os_thread");
+ }
r=0;
+ }
+
+#ifdef QUEUE_FREEABLE_THREAD_STACKS
+ free_freeable_stacks();
+#endif
thread_sigmask(SIG_SETMASK,&oldset,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
return r;
}
-struct thread *create_thread(lispobj initial_function) {
+os_thread_t create_thread(lispobj initial_function) {
struct thread *th;
- os_thread_t kid_tid=0;
- boolean success;
-
- if(linux_no_threads_p) return 0;
+ os_thread_t kid_tid;
- th=create_thread_struct(initial_function);
+ /* 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==0) return 0;
- /* 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
+ if (create_os_thread(th,&kid_tid)) {
+ return kid_tid;
+ } else {
free_thread_struct(th);
-
- RELEASE_ALL_THREADS_LOCK("create_thread")
-
- if (success)
- return th;
- else
return 0;
-}
-
-/* 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);
}
-#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
+kill_thread_safely(os_thread_t os_thread, int signo)
{
int r;
/* The man page does not mention EAGAIN as a valid return value
return r;
}
-int interrupt_thread(struct thread *th, lispobj function)
+int signal_interrupt_thread(os_thread_t os_thread)
{
- /* 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));
- }
+ int status = kill_thread_safely(os_thread, SIG_INTERRUPT_THREAD);
+ if (status == 0) {
+ return 0;
+ } else if (status == ESRCH) {
+ return -1;
+ } else {
+ lose("cannot send SIG_INTERRUPT_THREAD to thread=%lu: %d, %s\n",
+ os_thread, status, strerror(status));
}
}
void gc_stop_the_world()
{
struct thread *p,*th=arch_os_get_current_thread();
- int status;
+ 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, thread=%lu\n",
+ th->os_thread));
+ lock_ret = pthread_mutex_lock(&create_thread_lock);
+ gc_assert(lock_ret == 0);
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world:got create_thread_lock, thread=%lu\n",
+ th->os_thread));
+#endif
FSHOW_SIGNAL((stderr,"/gc_stop_the_world:waiting on lock, thread=%lu\n",
th->os_thread));
/* keep threads from starting while the world is stopped. */
- pthread_mutex_lock(&all_threads_lock); \
+ lock_ret = pthread_mutex_lock(&all_threads_lock); \
+ gc_assert(lock_ret == 0);
+
FSHOW_SIGNAL((stderr,"/gc_stop_the_world:got lock, thread=%lu\n",
th->os_thread));
/* 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",
- p->os_thread));
+ gc_assert(p->os_thread != 0);
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world: p->state: %x\n", p->state));
+ if((p!=th) && ((p->state==STATE_RUNNING))) {
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world: suspending %x, os_thread %x\n",
+ p, p->os_thread));
status=kill_thread_safely(p->os_thread,SIG_STOP_FOR_GC);
if (status==ESRCH) {
/* This thread has exited. */
gc_assert(p->state==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 {
+ FSHOW_SIGNAL((stderr,"/gc_stop_the_world: th: %p, p: %p\n", th, p));
+ if((p!=th) && (p->state==STATE_RUNNING)) {
sched_yield();
+ } else {
+ p=p->next;
}
}
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 status, 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: resuming %lu\n",
p->os_thread));
p->state=STATE_RUNNING;
+
+#if defined(SIG_RESUME_FROM_GC)
+ status=kill_thread_safely(p->os_thread,SIG_RESUME_FROM_GC);
+#else
status=kill_thread_safely(p->os_thread,SIG_STOP_FOR_GC);
+#endif
if (status) {
- lose("cannot resume thread=%lu: %d, %s",
+ lose("cannot resume thread=%lu: %d, %s\n",
p->os_thread,status,strerror(status));
}
}
* 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
projects / sbcl.git / blobdiff