#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
#include <sched.h>
#include <signal.h>
#include <stddef.h>
#include <errno.h>
-#include "runtime.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 "globals.h"
#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 */
volatile lispobj all_threads_lock;
extern struct interrupt_data * global_interrupt_data;
-void get_spinlock(lispobj *word,int value);
-
int
initial_thread_trampoline(struct thread *th)
{
if(th->pid < 1) lose("th->pid not set up right");
th->state=STATE_RUNNING;
-#if defined(LISP_FEATURE_X86)
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
return call_into_lisp_first_time(function,args,0);
#else
return funcall0(function);
* whatever other bookkeeping needs to be done
*/
+#ifdef LISP_FEATURE_SB_THREAD
int
new_thread_trampoline(struct thread *th)
{
th->state=STATE_RUNNING;
return funcall0(function);
}
+#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
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;
th->pseudo_atomic_atomic=0;
#endif
* 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;
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;
*/
protect_control_stack_guard_page(th->pid,1);
release_spinlock(&all_threads_lock);
+
+ sigprocmask(SIG_SETMASK,&oldset,0);
th->pid=kid_pid; /* child will not start until this is set */
}
-pid_t create_initial_thread(lispobj initial_function) {
+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) {
} else lose("can't create initial thread");
}
-#ifdef LISP_FEATURE_LINUX
+#ifdef LISP_FEATURE_SB_THREAD
pid_t create_thread(lispobj initial_function) {
struct thread *th=create_thread_struct(initial_function);
- pid_t kid_pid=clone(new_thread_trampoline,
- (((void*)th->control_stack_start)+
- THREAD_CONTROL_STACK_SIZE-4),
- CLONE_FILES|SIG_THREAD_EXIT|CLONE_VM,th);
-
- if(th && kid_pid>0) {
+ pid_t kid_pid=0;
+
+ if(th==0) return 0;
+ kid_pid=clone(new_thread_trampoline,
+ (((void*)th->control_stack_start)+
+ THREAD_CONTROL_STACK_SIZE-4),
+ CLONE_FILES|SIG_THREAD_EXIT|CLONE_VM,th);
+
+ if(kid_pid>0) {
link_thread(th,kid_pid);
return th->pid;
} else {
- destroy_thread(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);
return 0;
}
}
#endif
+/* unused */
void destroy_thread (struct thread *th)
{
/* precondition: the unix task has already been killed and exited.
- * This is called by the parent */
+ * This is called by the parent or some other thread */
#ifdef LISP_FEATURE_GENCGC
gc_alloc_update_page_tables(0, &th->alloc_region);
#endif
get_spinlock(&all_threads_lock,th->pid);
- th->state=STATE_STOPPED;
+ th->unbound_marker=0; /* for debugging */
if(th==all_threads)
all_threads=th->next;
else {
32*SIGSTKSZ);
}
-
struct thread *find_thread_by_pid(pid_t pid)
{
struct thread *th;
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. */
-#if defined LISP_FEATURE_SB_THREAD
void block_sigcont(void)
{
/* don't allow ourselves to receive SIGCONT while we're in the
int interrupt_thread(pid_t pid, lispobj function)
{
union sigval sigval;
+ struct thread *th;
sigval.sival_int=function;
-
- return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
+ 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)
/* 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
+ * 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.
*/
/* 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=0;
+ int finished;
do {
- get_spinlock(&all_threads_lock,th->pid);
+ finished=1;
for(p=all_threads,old_pid=p->pid; p; p=p->next) {
if(p==th) continue;
- if(p->state!=STATE_RUNNING) continue;
- p->state=STATE_STOPPING;
- kill(p->pid,SIG_STOP_FOR_GC);
+ 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;
+ }
}
- release_spinlock(&all_threads_lock);
- sched_yield();
- /* if everything has stopped, and there is no possibility that
- * a new thread has been created, we're done. Otherwise go
- * round again and signal anything that sprang up since last
- * time */
- if(old_pid==all_threads->pid) {
- finished=1;
- for_each_thread(p)
- finished = finished &&
- ((p==th) || (p->state==STATE_STOPPED));
+ if(old_pid!=all_threads->pid) {
+ finished=0;
}
} while(!finished);
}
void gc_start_the_world()
{
struct thread *p,*th=arch_os_get_current_thread();
- get_spinlock(&all_threads_lock,th->pid);
+ /* 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) continue;
+ if((p==th) || (p->state==STATE_DEAD)) continue;
p->state=STATE_RUNNING;
- kill(p->pid,SIGCONT);
+ kill(p->pid,SIG_STOP_FOR_GC);
}
- release_spinlock(&all_threads_lock);
}
#endif
projects / sbcl.git / blobdiff