[glib] Rework GMutex and GCond APIs



commit 80730bc75ca8b0ad71f1372c9652bee39391244e
Author: Ryan Lortie <desrt desrt ca>
Date:   Fri Sep 16 18:05:23 2011 -0400

    Rework GMutex and GCond APIs
    
    Do a substantial rework of the GMutex and GCond APIs.
    
     - remove all of the macro indirection hackery which is no longer needed
       since we dropped support for switchable thread implementations
    
     - expose the structure types and add G_MUTEX_INIT and G_COND_INIT
       static initialiser macros
    
     - add g_mutex_init() and g_mutex_clear() for use when embedding GMutex
       into another structure type and do the same for GCond as well
    
     - avoid infinite recursion hazards by ensuring that neither GCond or
       GMutex ever calls back into any other part of GLib
    
     - substantially rework the Windows implementation of GCond and GMutex
       to use the SRWLock and CONDITION_VARIABLE APIs present on Windows
       2008/Vista and later, emulating these APIs on XP

 glib/glib.symbols    |   16 +
 glib/gthread-posix.c |  363 +++++++++++++++++-------
 glib/gthread-win32.c |  759 ++++++++++++++++++++++++++++++++++++++------------
 glib/gthread.h       |   96 ++++---
 glib/gutils.c        |    3 +
 5 files changed, 907 insertions(+), 330 deletions(-)
---
diff --git a/glib/glib.symbols b/glib/glib.symbols
index ab943bb..33b72de 100644
--- a/glib/glib.symbols
+++ b/glib/glib.symbols
@@ -1594,3 +1594,19 @@ glib_micro_version
 glib_minor_version
 glib_on_error_halt
 g_mem_gc_friendly
+g_cond_broadcast
+g_cond_clear
+g_cond_free
+g_cond_init
+g_cond_new
+g_cond_signal
+g_cond_timedwait
+g_cond_timed_wait
+g_cond_wait
+g_mutex_clear
+g_mutex_free
+g_mutex_init
+g_mutex_lock
+g_mutex_new
+g_mutex_trylock
+g_mutex_unlock
diff --git a/glib/gthread-posix.c b/glib/gthread-posix.c
index 96abcf8..1fcc3dd 100644
--- a/glib/gthread-posix.c
+++ b/glib/gthread-posix.c
@@ -27,12 +27,248 @@
  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  */
 
-/*
- * MT safe
+/* The GMutex and GCond implementations in this file are some of the
+ * lowest-level code in GLib.  All other parts of GLib (messages,
+ * memory, slices, etc) assume that they can freely use these facilities
+ * without risking recursion.
+ *
+ * As such, these functions are NOT permitted to call any other part of
+ * GLib.
+ *
+ * The thread manipulation functions (create, exit, join, etc.) have
+ * more freedom -- they can do as they please.
  */
 
 #include "config.h"
 
+#include "gthread.h"
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+static void
+g_thread_abort (gint         status,
+                const gchar *function)
+{
+  fprintf (stderr, "GLib (gthread-posix.c): Unexpected error from C library during '%s': %s.  Aborting.\n",
+           strerror (status), function);
+  abort ();
+}
+
+/* {{{1 GMutex */
+void
+g_mutex_init (GMutex *mutex)
+{
+  gint status;
+
+  if G_UNLIKELY ((status = pthread_mutex_init (&mutex->impl, NULL)) != 0)
+    g_thread_abort (status, "pthread_mutex_init");
+}
+
+void
+g_mutex_clear (GMutex *mutex)
+{
+  gint status;
+
+  if G_UNLIKELY ((status = pthread_mutex_destroy (&mutex->impl)) != 0)
+    g_thread_abort (status, "pthread_mutex_destroy");
+}
+
+void
+g_mutex_lock (GMutex *mutex)
+{
+  gint status;
+
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return;
+
+  if G_UNLIKELY ((status = pthread_mutex_lock (&mutex->impl)) != 0)
+    g_thread_abort (status, "pthread_mutex_lock");
+}
+
+void
+g_mutex_unlock (GMutex *mutex)
+{
+  gint status;
+
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return;
+
+  if G_UNLIKELY ((status = pthread_mutex_unlock (&mutex->impl)) != 0)
+    g_thread_abort (status, "pthread_mutex_lock");
+}
+
+gboolean
+g_mutex_trylock (GMutex *mutex)
+{
+  gint status;
+
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return TRUE;
+
+  if G_LIKELY ((status = pthread_mutex_trylock (&mutex->impl)) == 0)
+    return TRUE;
+
+  if G_UNLIKELY (status != EBUSY)
+    g_thread_abort (status, "pthread_mutex_trylock");
+
+  return FALSE;
+}
+
+/* {{{1 GCond */
+
+void
+g_cond_init (GCond *cond)
+{
+  gint status;
+
+  if G_UNLIKELY ((status = pthread_cond_init (&cond->impl, NULL)) != 0)
+    g_thread_abort (status, "pthread_cond_init");
+}
+
+void
+g_cond_clear (GCond *cond)
+{
+  gint status;
+
+  if G_UNLIKELY ((status = pthread_cond_destroy (&cond->impl)) != 0)
+    g_thread_abort (status, "pthread_cond_destroy");
+}
+
+void
+g_cond_wait (GCond  *cond,
+             GMutex *mutex)
+{
+  gint status;
+
+  if G_UNLIKELY ((status = pthread_cond_wait (&cond->impl, &mutex->impl)) != 0)
+    g_thread_abort (status, "pthread_cond_wait");
+}
+
+void
+g_cond_signal (GCond *cond)
+{
+  gint status;
+
+  /* temporary until we fix libglib */
+  if (cond == NULL)
+    return;
+
+  if G_UNLIKELY ((status = pthread_cond_signal (&cond->impl)) != 0)
+    g_thread_abort (status, "pthread_cond_signal");
+}
+
+void
+g_cond_broadcast (GCond *cond)
+{
+  gint status;
+
+  /* temporary until we fix libglib */
+  if (cond == NULL)
+    return;
+
+  if G_UNLIKELY ((status = pthread_cond_broadcast (&cond->impl)) != 0)
+    g_thread_abort (status, "pthread_cond_broadcast");
+}
+
+gboolean
+g_cond_timed_wait (GCond    *cond,
+                   GMutex   *mutex,
+                   GTimeVal *abs_time)
+{
+  struct timespec end_time;
+  gint status;
+
+  if (abs_time == NULL)
+    {
+      g_cond_wait (cond, mutex);
+      return TRUE;
+    }
+
+  end_time.tv_sec = abs_time->tv_sec;
+  end_time.tv_nsec = abs_time->tv_usec * 1000;
+
+  if ((status = pthread_cond_timedwait (&cond->impl, &mutex->impl, &end_time)) == 0)
+    return TRUE;
+
+  if G_UNLIKELY (status != ETIMEDOUT)
+    g_thread_abort (status, "pthread_cond_timedwait");
+
+  return FALSE;
+}
+
+gboolean
+g_cond_timedwait (GCond  *cond,
+                  GMutex *mutex,
+                  gint64  abs_time)
+{
+  struct timespec end_time;
+  gint status;
+
+  end_time.tv_sec = abs_time / 1000000;
+  end_time.tv_nsec = (abs_time % 1000000) * 1000;
+
+  if ((status = pthread_cond_timedwait (&cond->impl, &mutex->impl, &end_time)) == 0)
+    return TRUE;
+
+  if G_UNLIKELY (status != ETIMEDOUT)
+    g_thread_abort (status, "pthread_cond_timedwait");
+
+  return FALSE;
+}
+
+/* {{{1 new/free API */
+
+GMutex *
+g_mutex_new (void)
+{
+  GMutex *mutex;
+
+  /* malloc() is temporary until all libglib users are ported away */
+  mutex = malloc (sizeof (GMutex));
+  if G_UNLIKELY (mutex == NULL)
+    g_thread_abort (errno, "malloc");
+  g_mutex_init (mutex);
+
+  return mutex;
+}
+
+void
+g_mutex_free (GMutex *mutex)
+{
+  g_mutex_clear (mutex);
+  free (mutex);
+}
+
+GCond *
+g_cond_new (void)
+{
+  GCond *cond;
+
+  /* malloc() is temporary until all libglib users are ported away */
+  cond = malloc (sizeof (GCond));
+  if G_UNLIKELY (cond == NULL)
+    g_thread_abort (errno, "malloc");
+  g_cond_init (cond);
+
+  return cond;
+}
+
+void
+g_cond_free (GCond *cond)
+{
+  g_cond_clear (cond);
+  free (cond);
+}
+
+/* {{{1 GPrivate */
+
 #include "glib.h"
 #include "gthreadprivate.h"
 
@@ -148,101 +384,6 @@ _g_thread_impl_init(void)
 #endif /* HAVE_PRIORITIES */
 }
 
-static GMutex *
-g_mutex_new_posix_impl (void)
-{
-  GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1);
-  posix_check_cmd (pthread_mutex_init ((pthread_mutex_t *) result, NULL));
-  return result;
-}
-
-static void
-g_mutex_free_posix_impl (GMutex * mutex)
-{
-  posix_check_cmd (pthread_mutex_destroy ((pthread_mutex_t *) mutex));
-  g_free (mutex);
-}
-
-/* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
-   functions from gmem.c and gmessages.c; */
-
-/* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
-   signature and semantic are right, but without error check then!!!!,
-   we might want to change this therefore. */
-
-static gboolean
-g_mutex_trylock_posix_impl (GMutex * mutex)
-{
-  int result;
-
-  result = pthread_mutex_trylock ((pthread_mutex_t *) mutex);
-
-  if (result == EBUSY)
-    return FALSE;
-
-  posix_check_err (result, "pthread_mutex_trylock");
-  return TRUE;
-}
-
-static GCond *
-g_cond_new_posix_impl (void)
-{
-  GCond *result = (GCond *) g_new (pthread_cond_t, 1);
-  posix_check_cmd (pthread_cond_init ((pthread_cond_t *) result, NULL));
-  return result;
-}
-
-/* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
-   can be taken directly, as signature and semantic are right, but
-   without error check then!!!!, we might want to change this
-   therefore. */
-
-#define G_NSEC_PER_SEC 1000000000
-
-static gboolean
-g_cond_timed_wait_posix_impl (GCond * cond,
-			      GMutex * entered_mutex,
-			      GTimeVal * abs_time)
-{
-  int result;
-  struct timespec end_time;
-  gboolean timed_out;
-
-  g_return_val_if_fail (cond != NULL, FALSE);
-  g_return_val_if_fail (entered_mutex != NULL, FALSE);
-
-  if (!abs_time)
-    {
-      result = pthread_cond_wait ((pthread_cond_t *)cond,
-                                  (pthread_mutex_t *) entered_mutex);
-      timed_out = FALSE;
-    }
-  else
-    {
-      end_time.tv_sec = abs_time->tv_sec;
-      end_time.tv_nsec = abs_time->tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC);
-
-      g_return_val_if_fail (end_time.tv_nsec < G_NSEC_PER_SEC, TRUE);
-
-      result = pthread_cond_timedwait ((pthread_cond_t *) cond,
-                                       (pthread_mutex_t *) entered_mutex,
-                                       &end_time);
-      timed_out = (result == ETIMEDOUT);
-    }
-
-  if (!timed_out)
-    posix_check_err (result, "pthread_cond_timedwait");
-
-  return !timed_out;
-}
-
-static void
-g_cond_free_posix_impl (GCond * cond)
-{
-  posix_check_cmd (pthread_cond_destroy ((pthread_cond_t *) cond));
-  g_free (cond);
-}
-
 static GPrivate *
 g_private_new_posix_impl (GDestroyNotify destructor)
 {
@@ -271,6 +412,9 @@ g_private_get_posix_impl (GPrivate * private_key)
   return pthread_getspecific (*(pthread_key_t *) private_key);
 }
 
+/* {{{1 GThread */
+
+
 static void
 g_thread_create_posix_impl (GThreadFunc thread_func,
 			    gpointer arg,
@@ -381,19 +525,20 @@ g_thread_equal_posix_impl (gpointer thread1, gpointer thread2)
   return (pthread_equal (*(pthread_t*)thread1, *(pthread_t*)thread2) != 0);
 }
 
+/* {{{1 Epilogue */
 GThreadFunctions g_thread_functions_for_glib_use =
 {
-  g_mutex_new_posix_impl,
-  (void (*)(GMutex *)) pthread_mutex_lock,
-  g_mutex_trylock_posix_impl,
-  (void (*)(GMutex *)) pthread_mutex_unlock,
-  g_mutex_free_posix_impl,
-  g_cond_new_posix_impl,
-  (void (*)(GCond *)) pthread_cond_signal,
-  (void (*)(GCond *)) pthread_cond_broadcast,
-  (void (*)(GCond *, GMutex *)) pthread_cond_wait,
-  g_cond_timed_wait_posix_impl,
-  g_cond_free_posix_impl,
+  g_mutex_new,
+  g_mutex_lock,
+  g_mutex_trylock,
+  g_mutex_unlock,
+  g_mutex_free,
+  g_cond_new,
+  g_cond_signal,
+  g_cond_broadcast,
+  g_cond_wait,
+  g_cond_timed_wait,
+  g_cond_free,
   g_private_new_posix_impl,
   g_private_get_posix_impl,
   g_private_set_posix_impl,
@@ -405,3 +550,5 @@ GThreadFunctions g_thread_functions_for_glib_use =
   g_thread_self_posix_impl,
   g_thread_equal_posix_impl
 };
+
+/* vim:set foldmethod=marker: */
diff --git a/glib/gthread-win32.c b/glib/gthread-win32.c
index d50aee1..a880e10 100644
--- a/glib/gthread-win32.c
+++ b/glib/gthread-win32.c
@@ -28,245 +28,309 @@
  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  */
 
-/*
- * MT safe
+/* The GMutex and GCond implementations in this file are some of the
+ * lowest-level code in GLib.  All other parts of GLib (messages,
+ * memory, slices, etc) assume that they can freely use these facilities
+ * without risking recursion.
+ *
+ * As such, these functions are NOT permitted to call any other part of
+ * GLib.
+ *
+ * The thread manipulation functions (create, exit, join, etc.) have
+ * more freedom -- they can do as they please.
  */
 
 #include "config.h"
 
-#include "glib.h"
-#include "gthreadprivate.h"
+#include "gthread.h"
 
-#define STRICT
 #define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
 #include <windows.h>
-#undef STRICT
 
 #include <process.h>
 #include <stdlib.h>
 #include <stdio.h>
 
-#define win32_check_for_error(what) G_STMT_START{			\
-  if (!(what))								\
-    g_error ("file %s: line %d (%s): error %s during %s",		\
-	     __FILE__, __LINE__, G_STRFUNC,				\
-	     g_win32_error_message (GetLastError ()), #what);		\
-  }G_STMT_END
-
-#define G_MUTEX_SIZE (sizeof (gpointer))
-
-static DWORD g_thread_self_tls;
-static DWORD g_private_tls;
-static DWORD g_cond_event_tls;
-static CRITICAL_SECTION g_thread_global_spinlock;
-
-typedef BOOL (__stdcall *GTryEnterCriticalSectionFunc) (CRITICAL_SECTION *);
-
-/* As noted in the docs, GPrivate is a limited resource, here we take
- * a rather low maximum to save memory, use GStaticPrivate instead. */
-#define G_PRIVATE_MAX 100
-
-static GDestroyNotify g_private_destructors[G_PRIVATE_MAX];
-
-static guint g_private_next = 0;
+static void
+g_thread_abort (gint         status,
+                const gchar *function)
+{
+  fprintf (stderr, "GLib (gthread-win32.c): Unexpected error from C library during '%s': %s.  Aborting.\n",
+           strerror (status), function);
+  abort ();
+}
 
-typedef struct _GThreadData GThreadData;
-struct _GThreadData
+/* Starting with Vista and Windows 2008, we have access to the
+ * CONDITION_VARIABLE and SRWLock primatives on Windows, which are
+ * pretty reasonable approximations of the primatives specified in
+ * POSIX 2001 (pthread_cond_t and pthread_mutex_t respectively).
+ *
+ * Both of these types are structs containing a single pointer.  That
+ * pointer is used as an atomic bitfield to support user-space mutexes
+ * that only get the kernel involved in cases of contention (similar
+ * to how futex()-based mutexes work on Linux).  The biggest advantage
+ * of these new types is that they can be statically initialised to
+ * zero.  This allows us to use them directly and still support:
+ *
+ *   GMutex mutex = G_MUTEX_INIT;
+ *
+ * and
+ *
+ *   GCond cond = G_COND_INIT;
+ *
+ * Unfortunately, Windows XP lacks these facilities and GLib still
+ * needs to support Windows XP.  Our approach here is as follows:
+ *
+ *   - avoid depending on structure declarations at compile-time by
+ *     declaring our own GMutex and GCond strutures to be
+ *     ABI-compatible with SRWLock and CONDITION_VARIABLE and using
+ *     those instead
+ *
+ *   - avoid a hard dependency on the symbols used to manipulate these
+ *     structures by doing a dynamic lookup of those symbols at
+ *     runtime
+ *
+ *   - if the symbols are not available, emulate them using other
+ *     primatives
+ *
+ * Using this approach also allows us to easily build a GLib that lacks
+ * support for Windows XP or to remove this code entirely when XP is no
+ * longer supported (end of line is currently April 8, 2014).
+ */
+typedef struct
 {
-  GThreadFunc func;
-  gpointer data;
-  HANDLE thread;
-  gboolean joinable;
-};
+  void     (* CallThisOnThreadExit)        (void);              /* fake */
+
+  void     (* InitializeSRWLock)           (gpointer lock);
+  void     (* DeleteSRWLock)               (gpointer lock);     /* fake */
+  void     (* AcquireSRWLockExclusive)     (gpointer lock);
+  BOOLEAN  (* TryAcquireSRWLockExclusive)  (gpointer lock);
+  void     (* ReleaseSRWLockExclusive)     (gpointer lock);
+
+  void     (* InitializeConditionVariable) (gpointer cond);
+  void     (* DeleteConditionVariable)     (gpointer cond);     /* fake */
+  BOOL     (* SleepConditionVariableSRW)   (gpointer cond,
+                                            gpointer lock,
+                                            DWORD    timeout,
+                                            ULONG    flags);
+  void     (* WakeAllConditionVariable)    (gpointer cond);
+  void     (* WakeConditionVariable)       (gpointer cond);
+} GThreadImplVtable;
+
+static GThreadImplVtable g_thread_impl_vtable;
+
+/* {{{1 GMutex */
+void
+g_mutex_init (GMutex *mutex)
+{
+  g_thread_impl_vtable.InitializeSRWLock (mutex);
+}
 
-struct _GCond
+void
+g_mutex_clear (GMutex *mutex)
 {
-  GPtrArray *array;
-  CRITICAL_SECTION lock;
-};
+  if (g_thread_impl_vtable.DeleteSRWLock != NULL)
+    g_thread_impl_vtable.DeleteSRWLock (mutex);
+}
 
-static GMutex *
-g_mutex_new_win32_impl (void)
+void
+g_mutex_lock (GMutex *mutex)
 {
-  CRITICAL_SECTION *cs = g_new (CRITICAL_SECTION, 1);
-  gpointer *retval = g_new (gpointer, 1);
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return;
 
-  InitializeCriticalSection (cs);
-  *retval = cs;
-  return (GMutex *) retval;
+  g_thread_impl_vtable.AcquireSRWLockExclusive (mutex);
 }
 
-static void
-g_mutex_free_win32_impl (GMutex *mutex)
+gboolean
+g_mutex_trylock (GMutex *mutex)
 {
-  gpointer *ptr = (gpointer *) mutex;
-  CRITICAL_SECTION *cs = (CRITICAL_SECTION *) *ptr;
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return TRUE;
 
-  DeleteCriticalSection (cs);
-  g_free (cs);
-  g_free (mutex);
+  return g_thread_impl_vtable.TryAcquireSRWLockExclusive (mutex);
 }
 
-/* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
-   functions from gmem.c and gmessages.c; */
-
-static void
-g_mutex_lock_win32_impl (GMutex *mutex)
+void
+g_mutex_unlock (GMutex *mutex)
 {
-  EnterCriticalSection (*(CRITICAL_SECTION **)mutex);
+  /* temporary until we fix libglib */
+  if (mutex == NULL)
+    return;
+
+  g_thread_impl_vtable.ReleaseSRWLockExclusive (mutex);
 }
 
-static gboolean
-g_mutex_trylock_win32_impl (GMutex * mutex)
+/* {{{1 GCond */
+void
+g_cond_init (GCond *cond)
 {
-  return TryEnterCriticalSection (*(CRITICAL_SECTION **)mutex);
+  g_thread_impl_vtable.InitializeConditionVariable (cond);
 }
 
-static void
-g_mutex_unlock_win32_impl (GMutex *mutex)
+void
+g_cond_clear (GCond *cond)
 {
-  LeaveCriticalSection (*(CRITICAL_SECTION **)mutex);
+  if (g_thread_impl_vtable.DeleteConditionVariable)
+    g_thread_impl_vtable.DeleteConditionVariable (cond);
 }
 
-static GCond *
-g_cond_new_win32_impl (void)
+void
+g_cond_signal (GCond *cond)
 {
-  GCond *retval = g_new (GCond, 1);
-
-  retval->array = g_ptr_array_new ();
-  InitializeCriticalSection (&retval->lock);
+  /* temporary until we fix libglib */
+  if (cond == NULL)
+    return;
 
-  return retval;
+  g_thread_impl_vtable.WakeConditionVariable (cond);
 }
 
-static void
-g_cond_signal_win32_impl (GCond * cond)
+void
+g_cond_broadcast (GCond *cond)
 {
-  EnterCriticalSection (&cond->lock);
-
-  if (cond->array->len > 0)
-    {
-      SetEvent (g_ptr_array_index (cond->array, 0));
-      g_ptr_array_remove_index (cond->array, 0);
-    }
+  /* temporary until we fix libglib */
+  if (cond == NULL)
+    return;
 
-  LeaveCriticalSection (&cond->lock);
+  g_thread_impl_vtable.WakeAllConditionVariable (cond);
 }
 
-static void
-g_cond_broadcast_win32_impl (GCond * cond)
+void
+g_cond_wait (GCond  *cond,
+             GMutex *entered_mutex)
 {
-  guint i;
-  EnterCriticalSection (&cond->lock);
-
-  for (i = 0; i < cond->array->len; i++)
-    SetEvent (g_ptr_array_index (cond->array, i));
-
-  g_ptr_array_set_size (cond->array, 0);
-  LeaveCriticalSection (&cond->lock);
+  g_thread_impl_vtable.SleepConditionVariableSRW (cond, entered_mutex, INFINITE, 0);
 }
 
-static gboolean
-g_cond_wait_internal (GCond *cond,
-		      GMutex *entered_mutex,
-		      gulong milliseconds)
+gboolean
+g_cond_timedwait (GCond  *cond,
+                  GMutex *entered_mutex,
+                  gint64  abs_time)
 {
-  gulong retval;
-  HANDLE event = TlsGetValue (g_cond_event_tls);
-
-  if (!event)
-    {
-      win32_check_for_error (event = CreateEvent (0, FALSE, FALSE, NULL));
-      TlsSetValue (g_cond_event_tls, event);
-    }
+  gint64 span;
+  FILETIME ft;
+  gint64 now;
 
-  EnterCriticalSection (&cond->lock);
+  GetSystemTimeAsFileTime (&ft);
+  memmove (&now, &ft, sizeof (FILETIME));
 
-  /* The event must not be signaled. Check this */
-  g_assert (WaitForSingleObject (event, 0) == WAIT_TIMEOUT);
+  now -= G_GINT64_CONSTANT (116444736000000000);
+  now /= 10;
 
-  g_ptr_array_add (cond->array, event);
-  LeaveCriticalSection (&cond->lock);
+  span = abs_time - now;
 
-  g_mutex_unlock (entered_mutex);
+  if G_UNLIKELY (span < 0)
+    span = 0;
 
-  win32_check_for_error (WAIT_FAILED !=
-			 (retval = WaitForSingleObject (event, milliseconds)));
+  if G_UNLIKELY (span > G_GINT64_CONSTANT (1000) * G_MAXINT32)
+    span = INFINITE;
 
-  g_mutex_lock (entered_mutex);
+  return g_thread_impl_vtable.SleepConditionVariableSRW (cond, entered_mutex, span / 1000, 0);
+}
 
-  if (retval == WAIT_TIMEOUT)
+gboolean
+g_cond_timed_wait (GCond    *cond,
+                   GMutex   *entered_mutex,
+                   GTimeVal *abs_time)
+{
+  if (abs_time)
     {
-      EnterCriticalSection (&cond->lock);
-      g_ptr_array_remove (cond->array, event);
+      gint64 micros;
 
-      /* In the meantime we could have been signaled, so we must again
-       * wait for the signal, this time with no timeout, to reset
-       * it. retval is set again to honour the late arrival of the
-       * signal */
-      win32_check_for_error (WAIT_FAILED !=
-			     (retval = WaitForSingleObject (event, 0)));
+      micros = abs_time->tv_sec;
+      micros *= 1000000;
+      micros += abs_time->tv_usec;
 
-      LeaveCriticalSection (&cond->lock);
+      return g_cond_timedwait (cond, entered_mutex, micros);
+    }
+  else
+    {
+      g_cond_wait (cond, entered_mutex);
+      return TRUE;
     }
+}
 
-#ifndef G_DISABLE_ASSERT
-  EnterCriticalSection (&cond->lock);
+/* {{{1 new/free API */
+GMutex *
+g_mutex_new (void)
+{
+  GMutex *mutex;
 
-  /* Now event must not be inside the array, check this */
-  g_assert (g_ptr_array_remove (cond->array, event) == FALSE);
+  /* malloc() is temporary until all libglib users are ported away */
+  mutex = malloc (sizeof (GMutex));
+  if G_UNLIKELY (mutex == NULL)
+    g_thread_abort (errno, "malloc");
+  g_mutex_init (mutex);
 
-  LeaveCriticalSection (&cond->lock);
-#endif /* !G_DISABLE_ASSERT */
+  return mutex;
+}
 
-  return retval != WAIT_TIMEOUT;
+void
+g_mutex_free (GMutex *mutex)
+{
+  g_mutex_clear (mutex);
+  free (mutex);
 }
 
-static void
-g_cond_wait_win32_impl (GCond *cond,
-			GMutex *entered_mutex)
+GCond *
+g_cond_new (void)
 {
-  g_return_if_fail (cond != NULL);
-  g_return_if_fail (entered_mutex != NULL);
+  GCond *cond;
+
+  /* malloc() is temporary until all libglib users are ported away */
+  cond = malloc (sizeof (GCond));
+  if G_UNLIKELY (cond == NULL)
+    g_thread_abort (errno, "malloc");
+  g_cond_init (cond);
 
-  g_cond_wait_internal (cond, entered_mutex, INFINITE);
+  return cond;
 }
 
-static gboolean
-g_cond_timed_wait_win32_impl (GCond *cond,
-			      GMutex *entered_mutex,
-			      GTimeVal *abs_time)
+void
+g_cond_free (GCond *cond)
 {
-  GTimeVal current_time;
-  gulong to_wait;
+  g_cond_clear (cond);
+  free (cond);
+}
 
-  g_return_val_if_fail (cond != NULL, FALSE);
-  g_return_val_if_fail (entered_mutex != NULL, FALSE);
+/* {{{1 GPrivate */
 
-  if (!abs_time)
-    to_wait = INFINITE;
-  else
-    {
-      g_get_current_time (&current_time);
-      if (abs_time->tv_sec < current_time.tv_sec ||
-	  (abs_time->tv_sec == current_time.tv_sec &&
-	   abs_time->tv_usec <= current_time.tv_usec))
-	to_wait = 0;
-      else
-	to_wait = (abs_time->tv_sec - current_time.tv_sec) * 1000 +
-	  (abs_time->tv_usec - current_time.tv_usec) / 1000;
-    }
+#include "glib.h"
+#include "gthreadprivate.h"
 
-  return g_cond_wait_internal (cond, entered_mutex, to_wait);
-}
+#define win32_check_for_error(what) G_STMT_START{			\
+  if (!(what))								\
+    g_error ("file %s: line %d (%s): error %s during %s",		\
+	     __FILE__, __LINE__, G_STRFUNC,				\
+	     g_win32_error_message (GetLastError ()), #what);		\
+  }G_STMT_END
 
-static void
-g_cond_free_win32_impl (GCond * cond)
+#define G_MUTEX_SIZE (sizeof (gpointer))
+
+static DWORD g_thread_self_tls;
+static DWORD g_private_tls;
+static CRITICAL_SECTION g_thread_global_spinlock;
+
+typedef BOOL (__stdcall *GTryEnterCriticalSectionFunc) (CRITICAL_SECTION *);
+
+/* As noted in the docs, GPrivate is a limited resource, here we take
+ * a rather low maximum to save memory, use GStaticPrivate instead. */
+#define G_PRIVATE_MAX 100
+
+static GDestroyNotify g_private_destructors[G_PRIVATE_MAX];
+
+static guint g_private_next = 0;
+
+typedef struct _GThreadData GThreadData;
+struct _GThreadData
 {
-  DeleteCriticalSection (&cond->lock);
-  g_ptr_array_free (cond->array, TRUE);
-  g_free (cond);
-}
+  GThreadFunc func;
+  gpointer data;
+  HANDLE thread;
+  gboolean joinable;
+};
 
 static GPrivate *
 g_private_new_win32_impl (GDestroyNotify destructor)
@@ -325,6 +389,8 @@ g_private_get_win32_impl (GPrivate * private_key)
   return array[index];
 }
 
+/* {{{1 GThread */
+
 static void
 g_thread_set_priority_win32_impl (gpointer thread, GThreadPriority priority)
 {
@@ -385,7 +451,6 @@ g_thread_exit_win32_impl (void)
   GThreadData *self = TlsGetValue (g_thread_self_tls);
   guint i, private_max;
   gpointer *array = TlsGetValue (g_private_tls);
-  HANDLE event = TlsGetValue (g_cond_event_tls);
 
   EnterCriticalSection (&g_thread_global_spinlock);
   private_max = g_private_next;
@@ -427,11 +492,8 @@ g_thread_exit_win32_impl (void)
       win32_check_for_error (TlsSetValue (g_thread_self_tls, NULL));
     }
 
-  if (event)
-    {
-      CloseHandle (event);
-      win32_check_for_error (TlsSetValue (g_cond_event_tls, NULL));
-    }
+  if (g_thread_impl_vtable.CallThisOnThreadExit)
+    g_thread_impl_vtable.CallThisOnThreadExit ();
 
   _endthreadex (0);
 }
@@ -513,19 +575,301 @@ g_thread_join_win32_impl (gpointer thread)
   g_free (target);
 }
 
+/* {{{1 SRWLock and CONDITION_VARIABLE emulation (for Windows XP) */
+
+static DWORD            g_thread_xp_waiter_tls;
+static CRITICAL_SECTION g_thread_xp_lock;
+
+/* {{{2 GThreadWaiter utility class for CONDITION_VARIABLE emulation */
+typedef struct _GThreadXpWaiter GThreadXpWaiter;
+struct _GThreadXpWaiter
+{
+  HANDLE                    event;
+  volatile GThreadXpWaiter *next;
+};
+
+static GThreadXpWaiter *
+g_thread_xp_waiter_get (void)
+{
+  GThreadXpWaiter *waiter;
+
+  waiter = TlsGetValue (g_thread_xp_waiter_tls);
+
+  if G_UNLIKELY (waiter == NULL)
+    {
+      waiter = malloc (sizeof (GThreadXpWaiter));
+      if (waiter == NULL)
+        g_thread_abort (GetLastError (), "malloc");
+      waiter->event = CreateEvent (0, FALSE, FALSE, NULL);
+      if (waiter->event == NULL)
+        g_thread_abort (GetLastError (), "CreateEvent");
+
+      TlsSetValue (g_thread_xp_waiter_tls, waiter);
+    }
+
+  return waiter;
+}
+
+static void
+g_thread_xp_CallThisOnThreadExit (void)
+{
+  GThreadXpWaiter *waiter;
+
+  waiter = TlsGetValue (g_thread_xp_waiter_tls);
+
+  if (waiter != NULL)
+    {
+      TlsSetValue (g_thread_xp_waiter_tls, NULL);
+      CloseHandle (waiter->event);
+      free (waiter);
+    }
+}
+
+/* {{{2 SRWLock emulation */
+typedef struct
+{
+  CRITICAL_SECTION critical_section;
+} GThreadSRWLock;
+
+static void
+g_thread_xp_InitializeSRWLock (gpointer mutex)
+{
+  *(GThreadSRWLock * volatile *) mutex = NULL;
+}
+
+static void
+g_thread_xp_DeleteSRWLock (gpointer mutex)
+{
+  GThreadSRWLock *lock = *(GThreadSRWLock * volatile *) mutex;
+
+  if (lock)
+    {
+      DeleteCriticalSection (&lock->critical_section);
+      free (lock);
+    }
+}
+
+static GThreadSRWLock *
+g_thread_xp_get_srwlock (GThreadSRWLock * volatile *lock)
+{
+  GThreadSRWLock *result;
+
+  /* It looks like we're missing some barriers here, but this code only
+   * ever runs on Windows XP, which in turn only ever runs on hardware
+   * with a relatively rigid memory model.  The 'volatile' will take
+   * care of the compiler.
+   */
+  result = *lock;
+
+  if G_UNLIKELY (result == NULL)
+    {
+      EnterCriticalSection (&g_thread_xp_lock);
+
+      result = malloc (sizeof (GThreadSRWLock));
+
+      if (result == NULL)
+        g_thread_abort (errno, "malloc");
+
+      InitializeCriticalSection (&result->critical_section);
+      *lock = result;
+
+      LeaveCriticalSection (&g_thread_xp_lock);
+    }
+
+  return result;
+}
+
+static void
+g_thread_xp_AcquireSRWLockExclusive (gpointer mutex)
+{
+  GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
+
+  EnterCriticalSection (&lock->critical_section);
+}
+
+static BOOLEAN
+g_thread_xp_TryAcquireSRWLockExclusive (gpointer mutex)
+{
+  GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
+
+  return TryEnterCriticalSection (&lock->critical_section);
+}
+
+static void
+g_thread_xp_ReleaseSRWLockExclusive (gpointer mutex)
+{
+  GThreadSRWLock *lock = *(GThreadSRWLock * volatile *) mutex;
+
+  /* We need this until we fix some weird parts of GLib that try to
+   * unlock freshly-allocated mutexes.
+   */
+  if (lock != NULL)
+    LeaveCriticalSection (&lock->critical_section);
+}
+
+/* {{{2 CONDITION_VARIABLE emulation */
+typedef struct
+{
+  volatile GThreadXpWaiter  *first;
+  volatile GThreadXpWaiter **last_ptr;
+} GThreadXpCONDITION_VARIABLE;
+
+static void
+g_thread_xp_InitializeConditionVariable (gpointer cond)
+{
+  *(GThreadXpCONDITION_VARIABLE * volatile *) cond = NULL;
+}
+
+static void
+g_thread_xp_DeleteConditionVariable (gpointer cond)
+{
+  GThreadXpCONDITION_VARIABLE *cv = *(GThreadXpCONDITION_VARIABLE * volatile *) cond;
+
+  if (cv)
+    free (cv);
+}
+
+static GThreadXpCONDITION_VARIABLE *
+g_thread_xp_get_condition_variable (GThreadXpCONDITION_VARIABLE * volatile *cond)
+{
+  GThreadXpCONDITION_VARIABLE *result;
+
+  /* It looks like we're missing some barriers here, but this code only
+   * ever runs on Windows XP, which in turn only ever runs on hardware
+   * with a relatively rigid memory model.  The 'volatile' will take
+   * care of the compiler.
+   */
+  result = *cond;
+
+  if G_UNLIKELY (result == NULL)
+    {
+      result = malloc (sizeof (GThreadXpCONDITION_VARIABLE));
+
+      if (result == NULL)
+        g_thread_abort (errno, "malloc");
+
+      result->first = NULL;
+      result->last_ptr = &result->first;
+
+      if (InterlockedCompareExchangePointer (cond, result, NULL) != NULL)
+        {
+          free (result);
+          result = *cond;
+        }
+    }
+
+  return result;
+}
+
+static BOOL
+g_thread_xp_SleepConditionVariableSRW (gpointer cond,
+                                       gpointer mutex,
+                                       DWORD    timeout,
+                                       ULONG    flags)
+{
+  GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
+  GThreadXpWaiter *waiter = g_thread_xp_waiter_get ();
+  DWORD status;
+
+  waiter->next = NULL;
+
+  EnterCriticalSection (&g_thread_xp_lock);
+  *cv->last_ptr = waiter;
+  cv->last_ptr = &waiter->next;
+  LeaveCriticalSection (&g_thread_xp_lock);
+
+  g_mutex_unlock (mutex);
+  status = WaitForSingleObject (waiter->event, timeout);
+
+  if (status != WAIT_TIMEOUT && status != WAIT_OBJECT_0)
+    g_thread_abort (GetLastError (), "WaitForSingleObject");
+
+  g_mutex_lock (mutex);
+
+  return status == WAIT_OBJECT_0;
+}
+
+static void
+g_thread_xp_WakeConditionVariable (gpointer cond)
+{
+  GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
+  volatile GThreadXpWaiter *waiter;
+
+  EnterCriticalSection (&g_thread_xp_lock);
+  waiter = cv->first;
+  if (waiter != NULL)
+    {
+      cv->first = waiter->next;
+      if (cv->first == NULL)
+        cv->last_ptr = &cv->first;
+    }
+  LeaveCriticalSection (&g_thread_xp_lock);
+
+  if (waiter != NULL)
+    SetEvent (waiter->event);
+}
+
+static void
+g_thread_xp_WakeAllConditionVariable (gpointer cond)
+{
+  GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
+  volatile GThreadXpWaiter *waiter;
+
+  EnterCriticalSection (&g_thread_xp_lock);
+  waiter = cv->first;
+  cv->first = NULL;
+  cv->last_ptr = &cv->first;
+  LeaveCriticalSection (&g_thread_xp_lock);
+
+  while (waiter != NULL)
+    {
+      volatile GThreadXpWaiter *next;
+
+      next = waiter->next;
+      SetEvent (waiter->event);
+      waiter = next;
+    }
+}
+
+/* {{{2 XP Setup */
+static void
+g_thread_xp_init (void)
+{
+  static const GThreadImplVtable g_thread_xp_impl_vtable = {
+    g_thread_xp_CallThisOnThreadExit,
+    g_thread_xp_InitializeSRWLock,
+    g_thread_xp_DeleteSRWLock,
+    g_thread_xp_AcquireSRWLockExclusive,
+    g_thread_xp_TryAcquireSRWLockExclusive,
+    g_thread_xp_ReleaseSRWLockExclusive,
+    g_thread_xp_InitializeConditionVariable,
+    g_thread_xp_DeleteConditionVariable,
+    g_thread_xp_SleepConditionVariableSRW,
+    g_thread_xp_WakeAllConditionVariable,
+    g_thread_xp_WakeConditionVariable
+  };
+
+  InitializeCriticalSection (&g_thread_xp_lock);
+  g_thread_xp_waiter_tls = TlsAlloc ();
+
+  g_thread_impl_vtable = g_thread_xp_impl_vtable;
+}
+
+/* {{{1 Epilogue */
+
 GThreadFunctions g_thread_functions_for_glib_use =
 {
-  g_mutex_new_win32_impl,           /* mutex */
-  g_mutex_lock_win32_impl,
-  g_mutex_trylock_win32_impl,
-  g_mutex_unlock_win32_impl,
-  g_mutex_free_win32_impl,
-  g_cond_new_win32_impl,            /* condition */
-  g_cond_signal_win32_impl,
-  g_cond_broadcast_win32_impl,
-  g_cond_wait_win32_impl,
-  g_cond_timed_wait_win32_impl,
-  g_cond_free_win32_impl,
+  g_mutex_new,           /* mutex */
+  g_mutex_lock,
+  g_mutex_trylock,
+  g_mutex_unlock,
+  g_mutex_free,
+  g_cond_new,            /* condition */
+  g_cond_signal,
+  g_cond_broadcast,
+  g_cond_wait,
+  g_cond_timed_wait,
+  g_cond_free,
   g_private_new_win32_impl,         /* private thread data */
   g_private_get_win32_impl,
   g_private_set_win32_impl,
@@ -548,11 +892,56 @@ _g_thread_impl_init (void)
 
   beenhere = TRUE;
 
+  printf ("thread init\n");
   win32_check_for_error (TLS_OUT_OF_INDEXES !=
 			 (g_thread_self_tls = TlsAlloc ()));
   win32_check_for_error (TLS_OUT_OF_INDEXES !=
 			 (g_private_tls = TlsAlloc ()));
-  win32_check_for_error (TLS_OUT_OF_INDEXES !=
-			 (g_cond_event_tls = TlsAlloc ()));
   InitializeCriticalSection (&g_thread_global_spinlock);
 }
+
+static gboolean
+g_thread_lookup_native_funcs (void)
+{
+  GThreadImplVtable native_vtable = { 0, };
+  HMODULE kernel32;
+
+  kernel32 = GetModuleHandle ("KERNEL32.DLL");
+
+  if (kernel32 == NULL)
+    return FALSE;
+
+#define GET_FUNC(name) if ((native_vtable.name = (void *) GetProcAddress (kernel32, #name)) == NULL) return FALSE
+  GET_FUNC(InitializeSRWLock);
+  GET_FUNC(AcquireSRWLockExclusive);
+  GET_FUNC(TryAcquireSRWLockExclusive);
+  GET_FUNC(ReleaseSRWLockExclusive);
+
+  GET_FUNC(InitializeConditionVariable);
+  GET_FUNC(SleepConditionVariableSRW);
+  GET_FUNC(WakeAllConditionVariable);
+  GET_FUNC(WakeConditionVariable);
+#undef GET_FUNC
+
+  g_thread_impl_vtable = native_vtable;
+
+  return TRUE;
+}
+
+G_GNUC_INTERNAL void
+g_thread_DllMain (void)
+{
+  /* XXX This is broken right now for some unknown reason...
+
+  if (g_thread_lookup_native_funcs ())
+    fprintf (stderr, "(debug) GThread using native mode\n");
+  else
+*/
+    {
+      fprintf (stderr, "(debug) GThread using Windows XP mode\n");
+      g_thread_xp_init ();
+    }
+}
+
+/* vim:set foldmethod=marker: */
+
diff --git a/glib/gthread.h b/glib/gthread.h
index a6f380e..68d808d 100644
--- a/glib/gthread.h
+++ b/glib/gthread.h
@@ -73,6 +73,37 @@ typedef struct _GCond           GCond;
 typedef struct _GPrivate        GPrivate;
 typedef struct _GStaticPrivate  GStaticPrivate;
 
+#ifdef G_OS_WIN32
+
+#define G_MUTEX_INIT { NULL }
+struct _GMutex
+{
+    gpointer impl;
+};
+
+#define G_COND_INIT { NULL }
+struct _GCond
+{
+    gpointer impl;
+};
+#else
+
+#include <pthread.h>
+
+#define G_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER }
+struct _GMutex
+{
+  pthread_mutex_t impl;
+};
+
+#define G_COND_INIT { PTHREAD_COND_INITIALIZER }
+struct _GCond
+{
+  pthread_cond_t impl;
+};
+
+#endif
+
 typedef struct _GThreadFunctions GThreadFunctions;
 struct _GThreadFunctions
 {
@@ -153,49 +184,13 @@ GMutex* g_static_mutex_get_mutex_impl   (GMutex **mutex);
       (*g_thread_functions_for_glib_use . op))				\
      (mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (fail))
 
-#ifndef G_ERRORCHECK_MUTEXES
-# define g_mutex_lock(mutex)						\
-    G_THREAD_CF (mutex_lock,     (void)0, (mutex))
-# define g_mutex_trylock(mutex)						\
-    G_THREAD_CF (mutex_trylock,  TRUE,    (mutex))
-# define g_mutex_unlock(mutex)						\
-    G_THREAD_CF (mutex_unlock,   (void)0, (mutex))
-# define g_mutex_free(mutex)						\
-    G_THREAD_CF (mutex_free,     (void)0, (mutex))
-# define g_cond_wait(cond, mutex)					\
-    G_THREAD_CF (cond_wait,      (void)0, (cond, mutex))
-# define g_cond_timed_wait(cond, mutex, abs_time)			\
-    G_THREAD_CF (cond_timed_wait, TRUE,   (cond, mutex, abs_time))
-#else /* G_ERRORCHECK_MUTEXES */
-# define g_mutex_lock(mutex)						\
-    G_THREAD_ECF (mutex_lock,    (void)0, (mutex), void)
-# define g_mutex_trylock(mutex)						\
-    G_THREAD_ECF (mutex_trylock, TRUE,    (mutex), gboolean)
-# define g_mutex_unlock(mutex)						\
-    G_THREAD_ECF (mutex_unlock,  (void)0, (mutex), void)
-# define g_mutex_free(mutex)						\
-    G_THREAD_ECF (mutex_free,    (void)0, (mutex), void)
-# define g_cond_wait(cond, mutex)					\
-    (g_thread_supported () ? ((void(*)(GCond*, GMutex*, gulong, gchar*))\
-      g_thread_functions_for_glib_use.cond_wait)			\
-        (cond, mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (void) 0)
-# define g_cond_timed_wait(cond, mutex, abs_time)			\
-    (g_thread_supported () ?						\
-      ((gboolean(*)(GCond*, GMutex*, GTimeVal*, gulong, gchar*))	\
-        g_thread_functions_for_glib_use.cond_timed_wait)		\
-          (cond, mutex, abs_time, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : TRUE)
-#endif /* G_ERRORCHECK_MUTEXES */
+
 
 #if defined(G_THREADS_MANDATORY)
 #define g_thread_supported()     1
 #else
 #define g_thread_supported()    (g_threads_got_initialized)
 #endif
-#define g_mutex_new()            G_THREAD_UF (mutex_new,      ())
-#define g_cond_new()             G_THREAD_UF (cond_new,       ())
-#define g_cond_signal(cond)      G_THREAD_CF (cond_signal,    (void)0, (cond))
-#define g_cond_broadcast(cond)   G_THREAD_CF (cond_broadcast, (void)0, (cond))
-#define g_cond_free(cond)        G_THREAD_CF (cond_free,      (void)0, (cond))
 #define g_private_new(destructor) G_THREAD_UF (private_new, (destructor))
 #define g_private_get(private_key) G_THREAD_CF (private_get, \
                                                 ((gpointer)private_key), \
@@ -382,6 +377,33 @@ extern void glib_dummy_decl (void);
 #  define G_TRYLOCK(name) g_static_mutex_trylock (&G_LOCK_NAME (name))
 #endif /* !G_DEBUG_LOCKS */
 
+
+void                    g_mutex_init                                    (GMutex         *mutex);
+void                    g_mutex_clear                                   (GMutex         *mutex);
+
+void                    g_mutex_lock                                    (GMutex         *mutex);
+void                    g_mutex_unlock                                  (GMutex         *mutex);
+gboolean                g_mutex_trylock                                 (GMutex         *mutex);
+
+void                    g_cond_init                                     (GCond          *cond);
+void                    g_cond_clear                                    (GCond          *cond);
+
+void                    g_cond_wait                                     (GCond          *cond,
+                                                                         GMutex         *mutex);
+void                    g_cond_signal                                   (GCond          *cond);
+void                    g_cond_broadcast                                (GCond          *cond);
+gboolean                g_cond_timed_wait                               (GCond          *cond,
+                                                                         GMutex         *mutex,
+                                                                         GTimeVal       *timeval);
+gboolean                g_cond_timedwait                                (GCond          *cond,
+                                                                         GMutex         *mutex,
+                                                                         gint64          abs_time);
+
+GMutex *                g_mutex_new                                     (void);
+void                    g_mutex_free                                    (GMutex         *mutex);
+GCond *                 g_cond_new                                      (void);
+void                    g_cond_free                                     (GCond          *cond);
+
 G_END_DECLS
 
 #endif /* __G_THREAD_H__ */
diff --git a/glib/gutils.c b/glib/gutils.c
index 162c2cf..c7f2763 100644
--- a/glib/gutils.c
+++ b/glib/gutils.c
@@ -201,7 +201,10 @@ DllMain (HINSTANCE hinstDLL,
 	 LPVOID    lpvReserved)
 {
   if (fdwReason == DLL_PROCESS_ATTACH)
+    {
       glib_dll = hinstDLL;
+      g_thread_DllMain ();
+    }
 
   return TRUE;
 }



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