X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fthread.c;h=ebdb2e464f5f69d743bf03d408531d42b1412925;hb=89823a09e0dd2869f7fea351d887f75e70548ea7;hp=e2f8ab1a9cb2cbabe4e75014303def6ebe4af305;hpb=aceb4720b6c1b0df6714e9648deb654ee291f051;p=sbcl.git

diff --git a/src/runtime/thread.c b/src/runtime/thread.c
index e2f8ab1..ebdb2e4 100644
--- a/src/runtime/thread.c
+++ b/src/runtime/thread.c
@@ -3,6 +3,7 @@
 #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
@@ -24,6 +25,7 @@
 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);
@@ -211,7 +213,7 @@ 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 +237,7 @@ 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 +245,7 @@ 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))
@@ -280,7 +283,56 @@ void unblock_sigcont_and_sleep(void)
     sigset_t set;
     sigemptyset(&set);
     sigaddset(&set,SIGCONT);
-    sigwaitinfo(&set,0);
+    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);
+}
+
+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