commit 60d82dd56c15a533562cf28111af5d3365d5d354
Author: Shiro Kawai <shiro@acm.org>
Date:   Thu May 31 15:23:22 2012 -1000

    Fixed thread-terminate! bug that SEGVs when applied on non-running threads

--- a/ext/threads/test.scm
+++ b/ext/threads/test.scm
@@ -100,6 +100,18 @@
            (thread-terminate! t1)
            (thread-join! t1))))
 
+;; this SEGVs on 0.9.3.3. test code from @cryks.
+(test* "thread termination before running" 'terminated
+       (let1 t1 (make-thread (^[] #f))
+         (thread-terminate! t1)
+         (thread-state t1)))
+
+(test* "thread termination while being stopped" 'terminated
+       (let1 t1 (thread-start! (make-thread (^[] (let loop () (loop)))))
+         (thread-stop! t1)
+         (thread-terminate! t1)
+         (thread-state t1)))
+
 ;;---------------------------------------------------------------------
 (test-section "thread and error")
 
--- a/ext/threads/threads.c
+++ b/ext/threads/threads.c
@@ -432,36 +432,41 @@ ScmObj Scm_ThreadTerminate(ScmVM *target)
     }
 
     (void)SCM_INTERNAL_MUTEX_LOCK(target->vmlock);
-    do {
-        /* This ensures only the first call of thread-terminate! on a thread
-           is in effect. */
-        if (target->canceller == NULL) {
-            target->canceller = vm;
-
-            /* First try */
-            target->stopRequest = SCM_VM_REQUEST_TERMINATE;
-            target->attentionRequest = TRUE;
-            if (wait_for_termination(target)) break;
-
-            /* Second try */
+    if (target->state == SCM_VM_RUNNABLE || target->state == SCM_VM_STOPPED) {
+        do {
+            /* This ensures only the first call of thread-terminate! on a
+               thread is in effect. */
+            if (target->canceller == NULL) {
+                target->canceller = vm;
+
+                /* First try */
+                target->stopRequest = SCM_VM_REQUEST_TERMINATE;
+                target->attentionRequest = TRUE;
+                if (wait_for_termination(target)) break;
+
+                /* Second try */
+                SCM_ASSERT(target->thread);
 #if defined(GAUCHE_USE_PTHREADS)
 # if defined(GAUCHE_PTHREAD_SIGNAL)
-            pthread_kill(target->thread, GAUCHE_PTHREAD_SIGNAL);
+                pthread_kill(target->thread, GAUCHE_PTHREAD_SIGNAL);
 # endif /*defined(GAUCHE_PTHREAD_SIGNAL)*/
 #elif defined(GAUCHE_USE_WTHREADS)
-            /* TODO: implement signal mechanism using an event */
+                /* TODO: implement signal mechanism using an event */
 #endif  /* defined(GAUCHE_USE_WTHREADS) */
-            if (wait_for_termination(target)) break;
+                if (wait_for_termination(target)) break;
 
-            /* Last resort */
-            thread_cleanup_inner(target);
+                /* Last resort */
+                thread_cleanup_inner(target);
 #if defined(GAUCHE_USE_PTHREADS)
-            pthread_cancel(target->thread);
+                pthread_cancel(target->thread);
 #elif defined(GAUCHE_USE_WTHREADS)
-            TerminateThread(target->thread, 0);
+                TerminateThread(target->thread, 0);
 #endif
-        }
-    } while (0);
+            }
+        } while (0);
+    }
+    /* target either is terminated or hasn't been run */
+    target->state = SCM_VM_TERMINATED;
     (void)SCM_INTERNAL_MUTEX_UNLOCK(target->vmlock);
     return SCM_UNDEFINED;
 }
--- a/test/control.scm
+++ b/test/control.scm
@@ -72,7 +72,7 @@
 ;;
 
 (cond-expand
- [gauche.sys.pthreads
+ [gauche.sys.threads
   (test-section "control.thread-pool")
   (use control.thread-pool)
   (test-module 'control.thread-pool)
@@ -173,7 +173,15 @@
            (let1 xjob (add-job! pool work)
              (terminate-all! pool :force-timeout 0.05)
              (job-status xjob))))
-  ]
+
+  ;; This SEGVs on 0.9.3.3 (test code by @cryks)
+  (test* "thread pool termination" 'terminated
+         (let ([t (thread-start! (make-thread (cut undefined)))]
+               [pool (make-thread-pool 10)])
+           (terminate-all! pool)
+           (thread-terminate! t)
+           (thread-state t)))
+  ] ; gauche.sys.pthreads
  [else])
 
 (test-end)