#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
+#include <signal.h>
#include <stddef.h>
+#include <errno.h>
#ifndef CLONE_PARENT /* lameass glibc 2.2 doesn't define this */
#define CLONE_PARENT 0x00008000 /* even though the manpage documents it */
#endif
int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */
struct thread *all_threads;
lispobj all_threads_lock;
+volatile int countdown_to_gc;
extern struct interrupt_data * global_interrupt_data;
void get_spinlock(lispobj *word,int value);
new_thread_trampoline(struct thread *th)
{
lispobj function;
+ lispobj *args = NULL;
function = th->unbound_marker;
if(go==0) {
fprintf(stderr, "/pausing 0x%lx(%d,%d) before new_thread_trampoline(0x%lx)\n",
fprintf(stderr, "/continue\n");
}
th->unbound_marker = UNBOUND_MARKER_WIDETAG;
+#ifdef LISP_FEATURE_SB_THREAD
/* wait here until our thread is linked into all_threads: see below */
while(th->pid<1) sched_yield();
+#else
+ if(th->pid < 1)
+ lose("th->pid not set up right");
+#endif
if(arch_os_thread_init(th)==0)
return 1; /* failure. no, really */
+#if !defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_X86)
+ return call_into_lisp_first_time(function,args,0);
+#else
return funcall0(function);
+#endif
}
/* this is called from any other thread to create the new one, and
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;
STATIC_TLS_INIT(BINDING_STACK_START,binding_stack_start);
STATIC_TLS_INIT(BINDING_STACK_POINTER,binding_stack_pointer);
STATIC_TLS_INIT(CONTROL_STACK_START,control_stack_start);
+ STATIC_TLS_INIT(CONTROL_STACK_END,control_stack_end);
STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
+#ifdef LISP_FEATURE_X86
STATIC_TLS_INIT(PSEUDO_ATOMIC_ATOMIC,pseudo_atomic_atomic);
STATIC_TLS_INIT(PSEUDO_ATOMIC_INTERRUPTED,pseudo_atomic_interrupted);
+#endif
#undef STATIC_TLS_INIT
+#endif
}
th->control_stack_start = spaces;
th->binding_stack_start=
(lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
+ th->control_stack_end = th->binding_stack_start;
th->alien_stack_start=
(lispobj*)((void*)th->binding_stack_start+BINDING_STACK_SIZE);
th->binding_stack_pointer=th->binding_stack_start;
#else
th->alien_stack_pointer=((void *)th->alien_stack_start);
#endif
+#ifdef LISP_FEATURE_X86
th->pseudo_atomic_interrupted=0;
/* runtime.c used to set PSEUDO_ATOMIC_ATOMIC =1 globally. I'm not
* sure why, but it appears to help */
th->pseudo_atomic_atomic=make_fixnum(1);
+#endif
+#ifdef LISP_FEATURE_GENCGC
gc_set_region_empty(&th->alloc_region);
-
+#endif
+
+#ifndef LISP_FEATURE_SB_THREAD
+ /* the tls-points-into-struct-thread trick is only good for threaded
+ * sbcl, because unithread sbcl doesn't have tls. So, we copy the
+ * appropriate values from struct thread here, and make sure that
+ * we use the appropriate SymbolValue macros to access any of the
+ * variable quantities from the C runtime. It's not quite OAOOM,
+ * it just feels like it */
+ SetSymbolValue(BINDING_STACK_START,th->binding_stack_start,th);
+ SetSymbolValue(CONTROL_STACK_START,th->control_stack_start,th);
+ SetSymbolValue(CONTROL_STACK_END,th->control_stack_end,th);
+#ifdef LISP_FEATURE_X86
+ SetSymbolValue(BINDING_STACK_POINTER,th->binding_stack_pointer,th);
+ SetSymbolValue(ALIEN_STACK,th->alien_stack_pointer,th);
+ SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,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;
+#endif
+#endif
bind_variable(CURRENT_CATCH_BLOCK,make_fixnum(0),th);
bind_variable(CURRENT_UNWIND_PROTECT_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);
- th->interrupt_data=malloc(sizeof (struct interrupt_data));
+ th->interrupt_data=os_validate(0,(sizeof (struct interrupt_data)));
if(all_threads)
- memcpy(th->interrupt_data,arch_os_get_current_thread()->interrupt_data,
+ 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));
-
-#if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX)
th->unbound_marker=initial_function;
+#ifdef LISP_FEATURE_SB_THREAD
+#if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX)
kid_pid=
clone(new_thread_trampoline,
(((void*)th->control_stack_start)+THREAD_CONTROL_STACK_SIZE-4),
#else
#error this stuff presently only works on x86 Linux
#endif
-
+#else
+ kid_pid=getpid();
+#endif
get_spinlock(&all_threads_lock,kid_pid);
th->next=all_threads;
all_threads=th;
* to ensure that we don't have >1 thread with pid=0 on the list at once
*/
protect_control_stack_guard_page(th->pid,1);
- all_threads_lock=0;
+ release_spinlock(&all_threads_lock);
th->pid=kid_pid; /* child will not start until this is set */
+#ifndef LISP_FEATURE_SB_THREAD
+ new_thread_trampoline(all_threads); /* call_into_lisp */
+ lose("Clever child? Idiot savant, verging on the.");
+#endif
+
return th->pid;
cleanup:
/* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */
{
/* precondition: the unix task has already been killed and exited.
* This is called by the parent */
+#ifdef LISP_FEATURE_GENCGC
gc_alloc_update_page_tables(0, &th->alloc_region);
+#endif
get_spinlock(&all_threads_lock,th->pid);
+ if(countdown_to_gc>0) countdown_to_gc--;
if(th==all_threads)
all_threads=th->next;
else {
while(th1->next!=th) th1=th1->next;
th1->next=th->next; /* unlink */
}
- all_threads_lock=0;
+ release_spinlock(&all_threads_lock);
if(th && th->tls_cookie>=0) arch_os_thread_cleanup(th);
os_invalidate((os_vm_address_t) th->control_stack_start,
- THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
- ALIEN_STACK_SIZE+dynamic_values_bytes+
+ ((sizeof (lispobj))
+ * (th->control_stack_end-th->control_stack_start)) +
+ BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+
32*SIGSTKSZ);
}
return 0;
}
-
-void get_spinlock(lispobj *word,int value)
-{
- u32 eax=0;
- do {
- asm ("xor %0,%0;cmpxchg %1,%2"
- : "=a" (eax)
- : "r" (value), "m" (*word)
- : "memory", "cc");
- } while(eax!=0);
-}
-
void block_sigcont(void)
{
/* don't allow ourselves to receive SIGCONT while we're in the
*/
sigset_t newset;
sigemptyset(&newset);
- sigaddset(&newset,SIGCONT);
+ sigaddset(&newset,SIG_DEQUEUE);
sigprocmask(SIG_BLOCK, &newset, 0);
}
+/* This is not needed unless #+SB-THREAD, and since sigwaitinfo()
+ * doesn't seem to be easily available everywhere (OpenBSD...) it's
+ * more trouble than it's worth to compile it when not needed. */
+#if defined LISP_FEATURE_SB_THREAD
void unblock_sigcont_and_sleep(void)
{
sigset_t set;
sigemptyset(&set);
- sigaddset(&set,SIGCONT);
- sigwaitinfo(&set,0);
+ sigaddset(&set,SIG_DEQUEUE);
+ do {
+ errno=0;
+ sigwaitinfo(&set,0);
+ }while(errno==EINTR);
sigprocmask(SIG_UNBLOCK,&set,0);
}
+int interrupt_thread(pid_t pid, lispobj function)
+{
+ union sigval sigval;
+ sigval.sival_int=function;
+
+ return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
+}
+
+/* stopping the world is a two-stage process. From this thread we signal
+ * all the others with SIG_STOP_FOR_GC. The handler for this thread does
+ * the usual pseudo-atomic checks (we don't want to stop a thread while
+ * it's in the middle of allocation) then kills _itself_ with SIGSTOP.
+ * At any given time, countdown_to_gc should reflect the number of threads
+ * signalled but which haven't yet come to rest
+ */
+
+void gc_stop_the_world()
+{
+ /* stop all other threads by sending them SIG_STOP_FOR_GC */
+ struct thread *p,*th=arch_os_get_current_thread();
+ struct thread *tail=0;
+ int finished=0;
+ do {
+ get_spinlock(&all_threads_lock,th->pid);
+ if(tail!=all_threads) {
+ /* new threads always get consed onto the front of all_threads,
+ * and may be created by any thread that we haven't signalled
+ * yet or hasn't received our signal and stopped yet. So, check
+ * for them on each time around */
+ for(p=all_threads;p!=tail;p=p->next) {
+ if(p==th) continue;
+ countdown_to_gc++;
+ kill(p->pid,SIG_STOP_FOR_GC);
+ }
+ tail=all_threads;
+ } else {
+ finished=(countdown_to_gc==0);
+ }
+ release_spinlock(&all_threads_lock);
+ sched_yield();
+ } while(!finished);
+}
+
+void gc_start_the_world()
+{
+ struct thread *p,*th=arch_os_get_current_thread();
+ get_spinlock(&all_threads_lock,th->pid);
+ for(p=all_threads;p;p=p->next) {
+ if(p==th) continue;
+ kill(p->pid,SIGCONT);
+ }
+ release_spinlock(&all_threads_lock);
+}
+#endif
projects / sbcl.git / blobdiff