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| author | Guenter Bartsch <guenter@users.sourceforge.net> | 2003-04-20 16:42:06 +0000 |
|---|---|---|
| committer | Guenter Bartsch <guenter@users.sourceforge.net> | 2003-04-20 16:42:06 +0000 |
| commit | ce4f3efd78c110c015c54eab05f201d1caac5f8d (patch) | |
| tree | 668c555d5de70518b93426f45fe3e44d7f06663c /win32/contrib/pthreads/errno.c | |
| parent | 80f6215b607f0ed76f7f75deaf4e4668bc6f244d (diff) | |
| download | xine-lib-ce4f3efd78c110c015c54eab05f201d1caac5f8d.tar.gz xine-lib-ce4f3efd78c110c015c54eab05f201d1caac5f8d.tar.bz2 | |
importing win32 contrib sources and msvc build environment
CVS patchset: 4641
CVS date: 2003/04/20 16:42:06
Diffstat (limited to 'win32/contrib/pthreads/errno.c')
| -rw-r--r-- | win32/contrib/pthreads/errno.c | 82 |
1 files changed, 82 insertions, 0 deletions
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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