From fc52e9e44c2fe84d63f18dc0098720830f0b467d Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 3 May 2011 00:09:16 -0400
Subject: [PATCH] Implement win32 thread-safety stuff

Patch from Bradley Grainger.
---
 src/hb-common.cc  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/hb-private.hh | 30 +++++++++++++++++++++++++-----
 2 files changed, 79 insertions(+), 5 deletions(-)

diff --git a/src/hb-common.cc b/src/hb-common.cc
index b75146d..2f5e89b 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -263,4 +263,58 @@ hb_script_get_horizontal_direction (hb_script_t script)
 }
 
 
+
+/* System stuff */
+
+
+#ifdef _MSC_VER
+
+#include <Windows.h>
+
+hb_mutex_t
+_hb_win32_mutex_create ()
+{
+  hb_mutex_t m;
+  _hb_win32_mutex_init (&m);
+  return m;
+}
+
+void
+_hb_win32_mutex_init (hb_mutex_t *m)
+{
+  LPCRITICAL_SECTION lpcs = (LPCRITICAL_SECTION) calloc(1, sizeof(CRITICAL_SECTION));
+  InitializeCriticalSection (lpcs);
+  *m = (void*) lpcs;
+}
+
+void
+_hb_win32_mutex_lock (hb_mutex_t m)
+{
+  EnterCriticalSection ((LPCRITICAL_SECTION) m);
+}
+
+int
+_hb_win32_mutex_trylock (hb_mutex_t m)
+{
+  return TryEnterCriticalSection ((LPCRITICAL_SECTION) m);
+}
+
+void
+_hb_win32_mutex_unlock (hb_mutex_t m)
+{
+  LeaveCriticalSection ((LPCRITICAL_SECTION) m);
+}
+
+void
+_hb_win32_mutex_free (hb_mutex_t *m)
+{
+  LPCRITICAL_SECTION lpcs = (LPCRITICAL_SECTION) *m;
+  DeleteCriticalSection (lpcs);
+  free(lpcs);
+  *m = 0;
+}
+
+#endif
+
+
 HB_END_DECLS
diff --git a/src/hb-private.hh b/src/hb-private.hh
index a45fece..cac434a 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -243,13 +243,31 @@ typedef GStaticMutex hb_mutex_t;
 #else
 
 #ifdef _MSC_VER
-#define _HB__STR2__(x) #x
-#define _HB__STR1__(x) _HB__STR2__(x)
-#define _HB__LOC__ __FILE__ "("_HB__STR1__(__LINE__)") : Warning Msg: "
-#pragma message(_HB__LOC__"Could not find any system to define platform macros, library will NOT be thread-safe")
+
+#include <intrin.h>
+
+typedef long hb_atomic_int_t;
+#define hb_atomic_int_fetch_and_add(AI, V)	_InterlockedExchangeAdd (&(AI), V)
+#define hb_atomic_int_get(AI)			(_ReadBarrier (), (AI))
+#define hb_atomic_int_set(AI, V)		((void) _InterlockedExchange (&(AI), (V)))
+
+typedef void * hb_mutex_t;
+extern HB_INTERNAL hb_mutex_t _hb_win32_mutex_create (void);
+extern HB_INTERNAL void _hb_win32_mutex_init (hb_mutex_t *m);
+extern HB_INTERNAL void _hb_win32_mutex_lock (hb_mutex_t m);
+extern HB_INTERNAL int _hb_win32_mutex_trylock (hb_mutex_t m);
+extern HB_INTERNAL void _hb_win32_mutex_unlock (hb_mutex_t m);
+extern HB_INTERNAL void _hb_win32_mutex_free (hb_mutex_t *m);
+#define HB_MUTEX_INIT				_hb_win32_mutex_create ()
+#define hb_mutex_init(M)			_hb_win32_mutex_init (&(M))
+#define hb_mutex_lock(M)			_hb_win32_mutex_lock ((M))
+#define hb_mutex_trylock(M)			_hb_win32_mutex_trylock ((M))
+#define hb_mutex_unlock(M)			_hb_win32_mutex_unlock ((M))
+#define hb_mutex_free(M)			_hb_win32_mutex_free (&(M))
+
 #else
+
 #warning "Could not find any system to define platform macros, library will NOT be thread-safe"
-#endif
 
 typedef volatile int hb_atomic_int_t;
 #define hb_atomic_int_fetch_and_add(AI, V)	((AI) += (V), (AI) - (V))
@@ -266,6 +284,8 @@ typedef volatile int hb_mutex_t;
 
 #endif
 
+#endif
+
 
 HB_END_DECLS
 
-- 
2.7.4