diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index c5cc97b7576..508741e8e07 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -173,7 +173,7 @@ debug_channels (msvcrt)
 @ stub _atoi64 #(str)
 @ stub _atoldbl 
 @ cdecl _beep(long long) _beep
-@ stub _beginthread #(ptr long ptr)
+@ cdecl _beginthread (ptr long ptr) _beginthread
 @ cdecl _beginthreadex (ptr long ptr ptr long ptr) _beginthreadex
 @ cdecl _c_exit() MSVCRT__c_exit
 @ cdecl _cabs(long) _cabs
@@ -204,7 +204,7 @@ debug_channels (msvcrt)
 @ stub _dup #(long)
 @ stub _dup2 #(long long)
 @ cdecl _ecvt( double long ptr ptr) ecvt
-@ stub _endthread #()
+@ cdecl _endthread () _endthread
 @ cdecl _endthreadex(long) _endthreadex
 @ extern _environ MSVCRT__environ
 @ cdecl _eof(long) _eof
@@ -322,7 +322,7 @@ debug_channels (msvcrt)
 @ cdecl _j1(double) j1
 @ cdecl _jn(long double) jn
 @ cdecl _kbhit() _kbhit
-@ stub _lfind
+@ cdecl _lfind(ptr ptr ptr long ptr) _lfind
 @ cdecl _loaddll(str) _loaddll
 @ cdecl _local_unwind2(ptr long) _local_unwind2
 @ stub _lock
@@ -335,7 +335,7 @@ debug_channels (msvcrt)
 @ cdecl _lseek(long long long) _lseek
 @ stub _lseeki64 #(long long long)
 @ forward -noimport _ltoa ntdll._ltoa
-@ stub _ltow #(long)
+@ cdecl _ltow(long ptr long) _ltow
 @ cdecl _makepath(str str str str str) _makepath
 @ cdecl _matherr(ptr) _matherr
 @ cdecl _mbbtombc(long) _mbbtombc
diff --git a/dlls/msvcrt/thread.c b/dlls/msvcrt/thread.c
index 138706c5d6c..e345bc9be25 100644
--- a/dlls/msvcrt/thread.c
+++ b/dlls/msvcrt/thread.c
@@ -9,27 +9,79 @@
 
 DEFAULT_DEBUG_CHANNEL(msvcrt);
 
+/********************************************************************/
+
+typedef struct {
+  _beginthread_start_routine_t start_address;
+  void *arglist;
+} _beginthread_trampoline_t;
+
+/*********************************************************************
+ *		_beginthread_trampoline
+ */
+static DWORD CALLBACK _beginthread_trampoline(LPVOID arg)
+{
+  _beginthread_trampoline_t *trampoline = arg;
+  trampoline->start_address(trampoline->arglist);
+  return 0;
+}
+
+/*********************************************************************
+ *		_beginthread (MSVCRT.@)
+ */
+unsigned long _beginthread(
+  _beginthread_start_routine_t start_address, /* [in] Start address of routine that begins execution of new thread */
+  unsigned int stack_size, /* [in] Stack size for new thread or 0 */
+  void *arglist)           /* [in] Argument list to be passed to new thread or NULL */
+{
+  _beginthread_trampoline_t trampoline;
+
+  TRACE("(%p, %d, %p)\n", start_address, stack_size, arglist);
+
+  trampoline.start_address = start_address;
+  trampoline.arglist = arglist;
+
+  /* FIXME */
+  return CreateThread(NULL, stack_size, _beginthread_trampoline, &trampoline, 0, NULL);
+}
 
 /*********************************************************************
  *		_beginthreadex (MSVCRT.@)
  */
-unsigned long _beginthreadex(void* sec,
-                             unsigned int stack,
-                             unsigned __stdcall (*start)(void*),
-                             void* arg, unsigned int flag,
-                             unsigned int* addr)
+unsigned long _beginthreadex(
+  void *security,          /* [in] Security descriptor for new thread; must be NULL for Windows 9x applications */
+  unsigned int stack_size, /* [in] Stack size for new thread or 0 */
+  _beginthreadex_start_routine_t start_address, /* [in] Start address of routine that begins execution of new thread */
+  void *arglist,           /* [in] Argument list to be passed to new thread or NULL */
+  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 */
 {
-  TRACE("(%p,%d,%p,%p,%d,%p)\n",sec, stack,start, arg,flag,addr);
+  TRACE("(%p, %d, %p, %p, %d, %p)\n", security, stack_size, start_address, arglist, initflag, thrdaddr);
+
   /* FIXME */
-  return CreateThread( sec, stack, (LPTHREAD_START_ROUTINE)start, arg,flag,(LPDWORD)addr);
+  return CreateThread(security, stack_size, (LPTHREAD_START_ROUTINE) start_address,
+                      arglist, initflag, (LPDWORD) thrdaddr);
+}
+
+/*********************************************************************
+ *		_endthread (MSVCRT.@)
+ */
+void _endthread(void)
+{
+  TRACE("(void)\n");
+
+  /* FIXME */
+  ExitThread(0);
 }
 
 /*********************************************************************
  *		_endthreadex (MSVCRT.@)
  */
-void _endthreadex(unsigned int retval)
+void _endthreadex(
+  unsigned int retval) /* [in] Thread exit code */
 {
-  TRACE("(%d)\n",retval);
+  TRACE("(%d)\n", retval);
+
   /* FIXME */
   ExitThread(retval);
 }
diff --git a/include/msvcrt/process.h b/include/msvcrt/process.h
index da09e736141..decac48227a 100644
--- a/include/msvcrt/process.h
+++ b/include/msvcrt/process.h
@@ -32,11 +32,14 @@
 extern "C" {
 #endif
 
-unsigned long _beginthread(void (*)(void*),unsigned,void*);
-unsigned long _beginthreadex(void*,unsigned,unsigned __stdcall (*)(void*),void*,unsigned, unsigned*);
+typedef void __cdecl (*_beginthread_start_routine_t)(void *);
+typedef unsigned int __stdcall (*_beginthreadex_start_routine_t)(void *);
+
+unsigned long _beginthread(_beginthread_start_routine_t,unsigned int,void*);
+unsigned long _beginthreadex(void*,unsigned int,_beginthreadex_start_routine_t,void*,unsigned int,unsigned int*);
 int         _cwait(int*,int,int);
 void        _endthread(void);
-void        _endthreadex(unsigned);
+void        _endthreadex(unsigned int);
 int         _execl(const char*,const char*,...);
 int         _execle(const char*,const char*,...);
 int         _execlp(const char*,const char*,...);