Added my_winthread.c. Thanks to Thimble Smith.

1 files changed, 104 insertions, 0 deletions

diff --git a/ext/mysql/libmysql/my_winthread.c b/ext/mysql/libmysql/my_winthread.c
new file mode 100644
index 0000000000..675ff54cfc
--- /dev/null
+++ b/ext/mysql/libmysql/my_winthread.c
@@ -0,0 +1,104 @@
+/* Copyright Abandoned.  Public domain, no warranty, etc. */
+
+/*****************************************************************************
+** Simulation of posix threads calls for WIN95 and NT
+*****************************************************************************/
+
+/* SAFE_MUTEX will not work until the thread structure is up to date */
+#undef SAFE_MUTEX
+
+#include "mysys_priv.h"
+#if defined(THREAD) && defined(__WIN__)
+#include <m_string.h>
+#undef getpid
+#include <process.h>
+
+static pthread_mutex_t THR_LOCK_thread;
+
+struct pthread_map
+{
+  HANDLE pthreadself;
+  pthread_handler func;
+  void *param;
+};
+
+void win_pthread_init(void)
+{
+  pthread_mutex_init(&THR_LOCK_thread,NULL);
+}
+
+/*
+** We have tried to use '_beginthreadex' instead of '_beginthread' here
+** but in this case the program leaks about 512 characters for each
+** created thread !
+** As we want to save the created thread handler for other threads to
+** use and to be returned by pthread_self() (instead of the Win32 pseudo
+** handler), we have to go trough pthread_start() to catch the returned handler
+** in the new thread.
+*/
+
+static pthread_handler_decl(pthread_start,param)
+{
+  pthread_handler func=((struct pthread_map *) param)->func;
+  void *func_param=((struct pthread_map *) param)->param;
+  my_thread_init();			/* Will always succeed in windows */
+  pthread_mutex_lock(&THR_LOCK_thread);	  /* Wait for beginthread to return */
+  win_pthread_self=((struct pthread_map *) param)->pthreadself;
+  pthread_mutex_unlock(&THR_LOCK_thread);
+  free((char*) param);			  /* Free param from create */
+  pthread_exit((void*) (*func)(func_param));
+  return 0;				  /* Safety */
+}
+
+
+int pthread_create(pthread_t *thread_id, pthread_attr_t *attr,
+		   pthread_handler func, void *param)
+{
+  HANDLE hThread;
+  struct pthread_map *map;
+  DBUG_ENTER("pthread_create");
+
+  if (!(map=malloc(sizeof(*map))))
+    DBUG_RETURN(-1);
+  map->func=func;
+  map->param=param;
+  pthread_mutex_lock(&THR_LOCK_thread);
+#ifdef __BORLANDC__
+  hThread=(HANDLE)_beginthread((void(_USERENTRY *)(void *)) pthread_start,
+			       attr->dwStackSize ? attr->dwStackSize :
+			       65535, (void*) map);
+#else
+  hThread=(HANDLE)_beginthread((void( __cdecl *)(void *)) pthread_start,
+			       attr->dwStackSize ? attr->dwStackSize :
+			       65535, (void*) map);
+#endif
+  DBUG_PRINT("info", ("hThread=%lu",(long) hThread));
+  *thread_id=map->pthreadself=hThread;
+  pthread_mutex_unlock(&THR_LOCK_thread);
+
+  if (hThread == (HANDLE) -1)
+  {
+    int error=errno;
+    DBUG_PRINT("error",
+	       ("Can't create thread to handle request (error %d)",error));
+    DBUG_RETURN(error ? error : -1);
+  }
+  VOID(SetThreadPriority(hThread, attr->priority)) ;
+  DBUG_RETURN(0);
+}
+
+
+void pthread_exit(void *a)
+{
+  _endthread();
+}
+
+/* This is neaded to get the macro pthread_setspecific to work */
+
+int win_pthread_setspecific(void *a,void *b,uint length)
+{
+  memcpy(a,b,length);
+  return 0;
+}
+
+#endif