#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
#include <sched.h>
#include <signal.h>
#include <stddef.h>
-#ifndef CLONE_PARENT /* lameass glibc 2.2 doesn't define this */
-#define CLONE_PARENT 0x00008000 /* even though the manpage documents it */
-#endif
-#include "runtime.h"
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
#include "sbcl.h"
+#include "runtime.h"
#include "validate.h" /* for CONTROL_STACK_SIZE etc */
#include "thread.h"
#include "arch.h"
#include "target-arch-os.h"
#include "os.h"
#include "globals.h"
-#ifdef LISP_FEATURE_GENCGC
-#include "gencgc.h"
-#endif
#include "dynbind.h"
#include "genesis/cons.h"
+#include "genesis/fdefn.h"
+#include "interr.h" /* for lose() */
+#include "gc-internal.h"
+
#define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */
int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */
struct thread *all_threads;
-lispobj all_threads_lock;
+volatile lispobj all_threads_lock;
extern struct interrupt_data * global_interrupt_data;
+extern int linux_no_threads_p;
-void get_spinlock(lispobj *word,int value);
+int
+initial_thread_trampoline(struct thread *th)
+{
+ lispobj function;
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+ lispobj *args = NULL;
+#endif
+
+ function = th->unbound_marker;
+ th->unbound_marker = UNBOUND_MARKER_WIDETAG;
+ if(arch_os_thread_init(th)==0) return 1;
+
+ if(th->pid < 1) lose("th->pid 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
+ return funcall0(function);
+#endif
+}
/* this is the first thing that clone() runs in the child (which is
* why the silly calling convention). Basically it calls the user's
* whatever other bookkeeping needs to be done
*/
-/* set go to 0 to stop the thread before it starts. Convenient if you
-* want to attach a debugger to it before it does anything */
-volatile int go=1;
-
+#ifdef LISP_FEATURE_SB_THREAD
int
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",
- (unsigned long)th,th->pid,getpid(),(unsigned long)function);
- while(go==0) ;
- fprintf(stderr, "/continue\n");
- }
th->unbound_marker = UNBOUND_MARKER_WIDETAG;
-#ifdef LISP_FEATURE_SB_THREAD
+ if(arch_os_thread_init(th)==0) return 1;
+
/* 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
+ th->state=STATE_RUNNING;
return funcall0(function);
-#endif
}
+#endif /* LISP_FEATURE_SB_THREAD */
/* 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
*/
-pid_t create_thread(lispobj initial_function) {
+struct thread * create_thread_struct(lispobj initial_function) {
union per_thread_data *per_thread;
struct thread *th=0; /* subdue gcc */
void *spaces=0;
- pid_t kid_pid;
/* 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
BINDING_STACK_SIZE+
ALIEN_STACK_SIZE+
dynamic_values_bytes+
- 32*SIGSTKSZ
- );
- if(!spaces) goto cleanup;
+ 32*SIGSTKSZ);
+ if(!spaces)
+ return NULL;
per_thread=(union per_thread_data *)
(spaces+
THREAD_CONTROL_STACK_SIZE+
BINDING_STACK_SIZE+
ALIEN_STACK_SIZE);
- th=&per_thread->thread;
if(all_threads) {
memcpy(per_thread,arch_os_get_current_thread(),
dynamic_values_bytes);
#endif
}
+ th=&per_thread->thread;
th->control_stack_start = spaces;
th->binding_stack_start=
(lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
th->binding_stack_pointer=th->binding_stack_start;
th->this=th;
th->pid=0;
+ th->state=STATE_STOPPED;
#ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
th->alien_stack_pointer=((void *)th->alien_stack_start
- + ALIEN_STACK_SIZE-4); /* naked 4. FIXME */
+ + ALIEN_STACK_SIZE-N_WORD_BYTES);
#else
th->alien_stack_pointer=((void *)th->alien_stack_start);
#endif
-#ifdef LISP_FEATURE_X86
+#if defined(LISP_FEATURE_X86) || defined (LISP_FEATURE_X86_64)
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);
+ th->pseudo_atomic_atomic=0;
#endif
#ifdef LISP_FEATURE_GENCGC
gc_set_region_empty(&th->alloc_region);
* 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(BINDING_STACK_START,(lispobj)th->binding_stack_start,th);
+ 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;
bind_variable(INTERRUPT_PENDING, NIL,th);
bind_variable(INTERRUPTS_ENABLED,T,th);
- th->interrupt_data=os_validate(0,(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,
sizeof (struct interrupt_data));
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),
- (((getpid()!=parent_pid)?(CLONE_PARENT):0)
- |CLONE_FILES|SIGALRM|CLONE_VM),th);
- if(kid_pid<=0)
- goto cleanup;
-#else
-#error this stuff presently only works on x86 Linux
-#endif
-#else
- kid_pid=getpid();
-#endif
+ return th;
+}
+
+void link_thread(struct thread *th,pid_t kid_pid)
+{
+ sigset_t newset,oldset;
+ sigemptyset(&newset);
+ sigaddset_blockable(&newset);
+ sigprocmask(SIG_BLOCK, &newset, &oldset);
+
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);
+
+ sigprocmask(SIG_SETMASK,&oldset,0);
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); */
- if(spaces) os_invalidate(spaces,
- THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
- ALIEN_STACK_SIZE+dynamic_values_bytes);
- return 0;
+void create_initial_thread(lispobj initial_function) {
+ struct thread *th=create_thread_struct(initial_function);
+ pid_t kid_pid=getpid();
+ if(th && kid_pid>0) {
+ link_thread(th,kid_pid);
+ initial_thread_trampoline(all_threads); /* no return */
+ } else lose("can't create initial thread");
}
-void destroy_thread (struct thread *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(th==all_threads)
- all_threads=th->next;
- else {
- struct thread *th1=all_threads;
- while(th1->next!=th) th1=th1->next;
- th1->next=th->next; /* unlink */
+#ifdef LISP_FEATURE_SB_THREAD
+pid_t create_thread(lispobj initial_function) {
+ struct thread *th;
+ pid_t kid_pid=0;
+
+ if(linux_no_threads_p) return 0;
+ th=create_thread_struct(initial_function);
+ if(th==0) return 0;
+ kid_pid=clone(new_thread_trampoline,
+ (((void*)th->control_stack_start)+
+ THREAD_CONTROL_STACK_SIZE-16),
+ CLONE_FILES|SIG_THREAD_EXIT|CLONE_VM,th);
+
+ if(kid_pid>0) {
+ link_thread(th,kid_pid);
+ return th->pid;
+ } else {
+ os_invalidate((os_vm_address_t) th->control_stack_start,
+ ((sizeof (lispobj))
+ * (th->control_stack_end-th->control_stack_start)) +
+ BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+
+ 32*SIGSTKSZ);
+ return 0;
}
- all_threads_lock=0;
- 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+
- 32*SIGSTKSZ);
}
-
+#endif
struct thread *find_thread_by_pid(pid_t pid)
{
return 0;
}
+#if defined LISP_FEATURE_SB_THREAD
+/* This is not needed unless #+SB-THREAD, as there's a trivial null
+ * unithread definition. */
+
+void mark_dead_threads()
+{
+ pid_t kid;
+ int status;
+ while(1) {
+ kid=waitpid(-1,&status,__WALL|WNOHANG);
+ if(kid<=0) break;
+ if(WIFEXITED(status) || WIFSIGNALED(status)) {
+ struct thread *th=find_thread_by_pid(kid);
+ if(th) th->state=STATE_DEAD;
+ }
+ }
+}
+
+void reap_dead_threads()
+{
+ struct thread *th,*next,*prev=0;
+ th=all_threads;
+ while(th) {
+ next=th->next;
+ if(th->state==STATE_DEAD) {
+ funcall1(SymbolFunction(HANDLE_THREAD_EXIT),make_fixnum(th->pid));
+#ifdef LISP_FEATURE_GENCGC
+ gc_alloc_update_page_tables(0, &th->alloc_region);
+#endif
+ get_spinlock(&all_threads_lock,th->pid);
+ if(prev) prev->next=next;
+ else all_threads=next;
+ release_spinlock(&all_threads_lock);
+ if(th->tls_cookie>=0) arch_os_thread_cleanup(th);
+ os_invalidate((os_vm_address_t) th->control_stack_start,
+ ((sizeof (lispobj))
+ * (th->control_stack_end-th->control_stack_start)) +
+ BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+
+ 32*SIGSTKSZ);
+ } else
+ prev=th;
+ th=next;
+ }
+}
+
+/* These are 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. */
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);
}
{
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;
+ struct thread *th;
+ sigval.sival_int=function;
+ for_each_thread(th)
+ if((th->pid==pid) && (th->state != STATE_DEAD))
+ return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
+ errno=EPERM; return -1;
+}
+
+int signal_thread_to_dequeue (pid_t pid)
+{
+ return kill (pid, SIG_DEQUEUE);
+}
+
+
+/* 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 signal 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.
+ */
+
+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();
+ pid_t old_pid;
+ int finished;
+ do {
+ finished=1;
+ for(p=all_threads,old_pid=p->pid; p; p=p->next) {
+ if(p==th) continue;
+ if(p->state==STATE_RUNNING) {
+ p->state=STATE_STOPPING;
+ if(kill(p->pid,SIG_STOP_FOR_GC)==-1) {
+ /* we can't kill the process; assume because it
+ * died already (and its parent is dead so never
+ * saw the SIGCHLD) */
+ p->state=STATE_DEAD;
+ }
+ }
+ if((p->state!=STATE_STOPPED) &&
+ (p->state!=STATE_DEAD)) {
+ finished=0;
+ }
+ }
+ if(old_pid!=all_threads->pid) {
+ finished=0;
+ }
+ } while(!finished);
+}
+
+void gc_start_the_world()
+{
+ struct thread *p,*th=arch_os_get_current_thread();
+ /* 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_lock, but it won't have been stopped so won't need
+ * restarting */
+ for(p=all_threads;p;p=p->next) {
+ if((p==th) || (p->state==STATE_DEAD)) continue;
+ p->state=STATE_RUNNING;
+ kill(p->pid,SIG_STOP_FOR_GC);
+ }
+}
+#endif
projects / sbcl.git / blobdiff