From 94e4d61bdaad74e0f31bb6d69521784303a0cb5e Mon Sep 17 00:00:00 2001
From: kosaki <kosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 7 May 2011 06:17:59 +0000
Subject: fix win32 native_cond_timedwait() makes SIGSEGV.

* thread_win32.h (rb_thread_cond_struct): add prev field instead of last.
  (ie cond_event_entry is now using double linked list instead of single)
* thread_win32.c (cond_event_entry): add prev field.

* thread_win32.c (__cond_timedwait): remove entry properly if timeout
  was happen.

* thread_win32.c (native_cond_signal): change for double linked list.
* thread_win32.c (native_cond_broadcast): ditto.
* thread_win32.c (native_cond_initialize): ditto.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31459 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 thread_win32.c | 48 ++++++++++++++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 16 deletions(-)

(limited to 'thread_win32.c')

diff --git a/thread_win32.c b/thread_win32.c
index 6c7e0d2669..360013db43 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -393,6 +393,7 @@ native_mutex_destroy(rb_thread_lock_t *lock)
 
 struct cond_event_entry {
     struct cond_event_entry* next;
+    struct cond_event_entry* prev;
     HANDLE event;
 };
 
@@ -401,9 +402,16 @@ native_cond_signal(rb_thread_cond_t *cond)
 {
     /* cond is guarded by mutex */
     struct cond_event_entry *e = cond->next;
+    struct cond_event_entry *head = (struct cond_event_entry*)cond;
+
+    if (e != head) {
+	struct cond_event_entry *next = e->next;
+	struct cond_event_entry *prev = e->prev;
+
+	prev->next = next;
+	next->prev = prev;
+	e->next = e->prev = e;
 
-    if (e) {
-	cond->next = e->next;
 	SetEvent(e->event);
     }
     else {
@@ -416,11 +424,19 @@ native_cond_broadcast(rb_thread_cond_t *cond)
 {
     /* cond is guarded by mutex */
     struct cond_event_entry *e = cond->next;
-    cond->next = 0;
+    struct cond_event_entry *head = (struct cond_event_entry*)cond;
+
+    while (e != head) {
+	struct cond_event_entry *next = e->next;
+	struct cond_event_entry *prev = e->prev;
 
-    while (e) {
 	SetEvent(e->event);
-	e = e->next;
+
+	prev->next = next;
+	next->prev = prev;
+	e->next = e->prev = e;
+
+	e = next;
     }
 }
 
@@ -430,19 +446,16 @@ __cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, unsigned long
 {
     DWORD r;
     struct cond_event_entry entry;
+    struct cond_event_entry *head = (struct cond_event_entry*)cond;
 
-    entry.next = 0;
     entry.event = CreateEvent(0, FALSE, FALSE, 0);
+    entry.mutex = mutex;
 
     /* cond is guarded by mutex */
-    if (cond->next) {
-	cond->last->next = &entry;
-	cond->last = &entry;
-    }
-    else {
-	cond->next = &entry;
-	cond->last = &entry;
-    }
+    entry.next = head;
+    entry.prev = head->prev;
+    head->prev->next = &entry;
+    head->prev = &entry;
 
     native_mutex_unlock(mutex);
     {
@@ -453,6 +466,9 @@ __cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, unsigned long
     }
     native_mutex_lock(mutex);
 
+    entry.prev->next = entry.next;
+    entry.next->prev = entry.prev;
+
     w32_close_handle(entry.event);
     return (r == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
 }
@@ -537,8 +553,8 @@ native_cond_timeout(rb_thread_cond_t *cond, struct timespec timeout_rel)
 static void
 native_cond_initialize(rb_thread_cond_t *cond, int flags)
 {
-    cond->next = 0;
-    cond->last = 0;
+    cond->next = (struct cond_event_entry *)cond;
+    cond->prev = (struct cond_event_entry *)cond;
 }
 
 static void
-- 
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