Improve MS-Windows implementation of threads.

 src/systhread.c (sys_cond_init): Set the 'initialized' member to
 true only if initialization is successful.  Initialize wait_count
 and wait_count_lock.
 (sys_cond_wait, sys_cond_signal, sys_cond_broadcast): If
 'initialized' is false, do nothing.
 (sys_cond_wait): Fix the implementation to avoid the "missed
 wakeup" bug: count the waiting threads, and reset the broadcast
 event once the last thread was released.
 (sys_cond_signal, sys_cond_broadcast): Use SetEvent instead of
 PulseEvent.  Don't signal the event if no threads are waiting.
 (sys_cond_destroy): Only close non-NULL handles.
 (sys_thread_create): Return zero if unsuccessful, 1 if successful.
 src/systhread.h (w32thread_cond_t): New member 'initialized'.
 Rename waiters_count and waiters_count_lock to wait_count and
 wait_count_lock, respectively.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 0aef16d34e3..3e901d84db9 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,22 @@
+2013-08-31  Eli Zaretskii  <eliz@gnu.org>
+
+        * systhread.c (sys_cond_init): Set the 'initialized' member to
+        true only if initialization is successful.  Initialize wait_count
+        and wait_count_lock.
+        (sys_cond_wait, sys_cond_signal, sys_cond_broadcast): If
+        'initialized' is false, do nothing.
+        (sys_cond_wait): Fix the implementation to avoid the "missed
+        wakeup" bug: count the waiting threads, and reset the broadcast
+        event once the last thread was released.
+        (sys_cond_signal, sys_cond_broadcast): Use SetEvent instead of
+        PulseEvent.  Don't signal the event if no threads are waiting.
+        (sys_cond_destroy): Only close non-NULL handles.
+        (sys_thread_create): Return zero if unsuccessful, 1 if successful.
+
+        * systhread.h (w32thread_cond_t): New member 'initialized'.
+        Rename waiters_count and waiters_count_lock to wait_count and
+        wait_count_lock, respectively.
+
 2013-08-30  Eli Zaretskii  <eliz@gnu.org>
 
         * systhread.h (w32thread_critsect, w32thread_cond_t, sys_mutex_t)