From ce4f3efd78c110c015c54eab05f201d1caac5f8d Mon Sep 17 00:00:00 2001
From: Guenter Bartsch <guenter@users.sourceforge.net>
Date: Sun, 20 Apr 2003 16:42:06 +0000
Subject: importing win32 contrib sources and msvc build environment

CVS patchset: 4641
CVS date: 2003/04/20 16:42:06
---
 win32/contrib/pthreads/errno.c | 82 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 win32/contrib/pthreads/errno.c

(limited to 'win32/contrib/pthreads/errno.c')

diff --git a/win32/contrib/pthreads/errno.c b/win32/contrib/pthreads/errno.c
new file mode 100644
index 000000000..d31e57ceb
--- /dev/null
+++ b/win32/contrib/pthreads/errno.c
@@ -0,0 +1,82 @@
+/*
+ * errno.c
+ *
+ * Description:
+ * This translation unit implements routines associated with spawning a new
+ * thread.
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright (C) 1998
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA
+ */
+
+#if (! defined(HAVE_ERRNO)) && (! defined(_REENTRANT)) && (! defined(_MT))
+
+#include "pthread.h"
+#include "implement.h"
+
+static int reallyBad    = ENOMEM;
+
+/*
+ * Re-entrant errno.
+ *
+ * Each thread has it's own errno variable in pthread_t.
+ *
+ * The benefit of using the pthread_t structure
+ * instead of another TSD key is TSD keys are limited
+ * on Win32 to 64 per process. Secondly, to implement
+ * it properly without using pthread_t you'd need
+ * to dynamically allocate an int on starting the thread
+ * and store it manually into TLS and then ensure that you free
+ * it on thread termination. We get all that for free
+ * by simply storing the errno on the pthread_t structure.
+ *
+ * MSVC and Mingw32 already have there own thread-safe errno.
+ *
+ * #if defined( _REENTRANT ) || defined( _MT )
+ * #define errno *_errno()
+ * 
+ * int *_errno( void );
+ * #else
+ * extern int errno;
+ * #endif
+ *
+ */
+
+int * _errno( void )
+{
+  pthread_t       self;
+  int             *result;
+        
+  if( ( self = pthread_self() ) == NULL )
+    {
+      /*
+       * Yikes! unable to allocate a thread!
+       * Throw an exception? return an error?
+       */
+      result = &reallyBad;
+    }
+  else
+    {
+      result = &(self->ptErrno);
+    }
+
+  return( result );
+
+} /* _errno */
+
+#endif /* (! HAVE_ERRNO) || (!_REENTRANT && (!_MT || !_MD)) */
-- 
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