Arkadiusz Hiler : msvcrt: Use trampoline for _beginthreadex().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9e2fb411dbe5e1bea3e6349fbb14e5346fb5b922
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=9e2fb411dbe5e1bea3e6349fbb14e5346fb5b922

Author: Arkadiusz Hiler <ahiler at codeweavers.com>
Date:   Wed May  5 13:03:11 2021 +0300

msvcrt: Use trampoline for _beginthreadex().

This way we can call _endthreadex() at the end as stated in the documentation.

Signed-off-by: Arkadiusz Hiler <ahiler at codeweavers.com>
Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/thread.c | 47 ++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/dlls/msvcrt/thread.c b/dlls/msvcrt/thread.c
index 8bf8d9327c1..d342d57d38c 100644
--- a/dlls/msvcrt/thread.c
+++ b/dlls/msvcrt/thread.c
@@ -27,7 +27,10 @@ WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
 typedef struct {
   HANDLE thread;
-  _beginthread_start_routine_t start_address;
+  union {
+      _beginthread_start_routine_t start_address;
+      _beginthreadex_start_routine_t start_address_ex;
+  };
   void *arglist;
 } _beginthread_trampoline_t;
 
@@ -147,6 +150,22 @@ uintptr_t CDECL _beginthread(
   return (uintptr_t)thread;
 }
 
+/*********************************************************************
+ *		_beginthreadex_trampoline
+ */
+static DWORD CALLBACK _beginthreadex_trampoline(LPVOID arg)
+{
+    unsigned int retval;
+    _beginthread_trampoline_t local_trampoline;
+    thread_data_t *data = msvcrt_get_thread_data();
+
+    memcpy(&local_trampoline, arg, sizeof(local_trampoline));
+    data->handle = local_trampoline.thread;
+    free(arg);
+
+    retval = local_trampoline.start_address_ex(local_trampoline.arglist);
+    _endthreadex(retval);
+}
 /*********************************************************************
  *		_beginthreadex (MSVCRT.@)
  */
@@ -158,12 +177,30 @@ uintptr_t CDECL _beginthreadex(
   unsigned int initflag,   /* [in] Initial state of new thread (0 for running or CREATE_SUSPEND for suspended) */
   unsigned int *thrdaddr)  /* [out] Points to a 32-bit variable that receives the thread identifier */
 {
+  _beginthread_trampoline_t* trampoline;
+  HANDLE thread;
+
   TRACE("(%p, %d, %p, %p, %d, %p)\n", security, stack_size, start_address, arglist, initflag, thrdaddr);
 
-  /* FIXME */
-  return (uintptr_t)CreateThread(security, stack_size,
-				     start_address, arglist,
-				     initflag, thrdaddr);
+  /* FIXME: may use different errno / return values */
+  if (!MSVCRT_CHECK_PMT(start_address)) return 0;
+
+  if (!(trampoline = malloc(sizeof(*trampoline))))
+      return 0;
+
+  trampoline->thread = INVALID_HANDLE_VALUE;
+  trampoline->start_address_ex = start_address;
+  trampoline->arglist = arglist;
+
+  thread = CreateThread(security, stack_size, _beginthreadex_trampoline,
+          trampoline, initflag, thrdaddr);
+  if(!thread) {
+      free(trampoline);
+      msvcrt_set_errno(GetLastError());
+      return 0;
+  }
+
+  return (uintptr_t)thread;
 }
 
 #if _MSVCR_VER>=80