From 3950ffe2a485479f6561c27364d3d7df5a21d124 Mon Sep 17 00:00:00 2001 From: Igor Pashev Date: Sun, 24 Jun 2012 22:28:35 +0000 Subject: Imported Upstream version 93u+ --- src/lib/libast/sfio/sfmutex.c | 69 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 src/lib/libast/sfio/sfmutex.c (limited to 'src/lib/libast/sfio/sfmutex.c') diff --git a/src/lib/libast/sfio/sfmutex.c b/src/lib/libast/sfio/sfmutex.c new file mode 100644 index 0000000..cc3a4b7 --- /dev/null +++ b/src/lib/libast/sfio/sfmutex.c @@ -0,0 +1,69 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler * +* David Korn * +* Phong Vo * +* * +***********************************************************************/ +#include "sfhdr.h" + +/* Obtain/release exclusive use of a stream. +** +** Written by Kiem-Phong Vo. +*/ + +/* the main locking/unlocking interface */ +#if __STD_C +int sfmutex(Sfio_t* f, int type) +#else +int sfmutex(f, type) +Sfio_t* f; +int type; +#endif +{ +#if !vt_threaded + NOTUSED(f); NOTUSED(type); + return 0; +#else + + SFONCE(); + + if(!f) + return -1; + + if(!f->mutex) + { if(f->bits&SF_PRIVATE) + return 0; + + vtmtxlock(_Sfmutex); + f->mutex = vtmtxopen(NIL(Vtmutex_t*), VT_INIT); + vtmtxunlock(_Sfmutex); + if(!f->mutex) + return -1; + } + + if(type == SFMTX_LOCK) + return vtmtxlock(f->mutex); + else if(type == SFMTX_TRYLOCK) + return vtmtxtrylock(f->mutex); + else if(type == SFMTX_UNLOCK) + return vtmtxunlock(f->mutex); + else if(type == SFMTX_CLRLOCK) + return vtmtxclrlock(f->mutex); + else return -1; +#endif /*vt_threaded*/ +} -- cgit v1.2.3