X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fthread.c;h=78a3ec33bc32df7890fae822a8d68473b4822f41;hb=d4b738d6c0b354de817fa490b50814e40872b3d0;hp=ffd14db15b551e3ecd9c82a9ea9ef393357e6fd8;hpb=6b7b0266343826426a3efffa3b8b8d4d552f8f97;p=sbcl.git

diff --git a/src/runtime/thread.c b/src/runtime/thread.c
index ffd14db..78a3ec3 100644
--- a/src/runtime/thread.c
+++ b/src/runtime/thread.c
@@ -24,6 +24,7 @@
 int dynamic_values_bytes=4096*sizeof(lispobj);	/* same for all threads */
 struct thread *all_threads;
 lispobj all_threads_lock;
+int countdown_to_gc;
 extern struct interrupt_data * global_interrupt_data;
 
 void get_spinlock(lispobj *word,int value);
@@ -211,7 +212,7 @@ pid_t create_thread(lispobj initial_function) {
      * 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 */
@@ -235,6 +236,7 @@ void destroy_thread (struct thread *th)
     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 {
@@ -242,7 +244,7 @@ void destroy_thread (struct thread *th)
 	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,
 		  ((sizeof (lispobj))
@@ -289,6 +291,44 @@ int interrupt_thread(pid_t pid, lispobj function)
     union sigval sigval;
     sigval.sival_int=function;
 
-    sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
+    return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
+}
+
+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