From 2ab3d99967d68c79351fe2a3df22c445447e3010 Mon Sep 17 00:00:00 2001
From: Michał Cichoń <michcic@gmail.com>
Date: Tue, 15 Nov 2011 22:28:48 +0100
Subject: Initial import.

---
 pthreads/src/errno.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 pthreads/src/errno.c

(limited to 'pthreads/src/errno.c')

diff --git a/pthreads/src/errno.c b/pthreads/src/errno.c
new file mode 100644
index 0000000..78aa920
--- /dev/null
+++ b/pthreads/src/errno.c
@@ -0,0 +1,94 @@
+/*
+ * errno.c
+ *
+ * Description:
+ * This translation unit implements routines associated with spawning a new
+ * thread.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser 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
+ *      Lesser General Public License for more details.
+ * 
+ *      You should have received a copy of the GNU Lesser General Public
+ *      License along with this library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#if defined(NEED_ERRNO)
+
+#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 their 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 ()).p == NULL)
+    {
+      /*
+       * Yikes! unable to allocate a thread!
+       * Throw an exception? return an error?
+       */
+      result = &reallyBad;
+    }
+  else
+    {
+      result = (int *)(&self.p->exitStatus);
+    }
+
+  return (result);
+
+}				/* _errno */
+
+#endif /* (NEED_ERRNO) */
-- 
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