1da2e3ebdSchin /*********************************************************************** 2da2e3ebdSchin * * 3da2e3ebdSchin * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2011 AT&T Intellectual Property * 5da2e3ebdSchin * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 77c2fbfb3SApril Chin * by AT&T Intellectual Property * 8da2e3ebdSchin * * 9da2e3ebdSchin * A copy of the License is available at * 10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html * 11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12da2e3ebdSchin * * 13da2e3ebdSchin * Information and Software Systems Research * 14da2e3ebdSchin * AT&T Research * 15da2e3ebdSchin * Florham Park NJ * 16da2e3ebdSchin * * 17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> * 18da2e3ebdSchin * David Korn <dgk@research.att.com> * 19da2e3ebdSchin * Phong Vo <kpv@research.att.com> * 20da2e3ebdSchin * * 21da2e3ebdSchin ***********************************************************************/ 22da2e3ebdSchin #include "sfhdr.h" 23da2e3ebdSchin 24da2e3ebdSchin /* Obtain/release exclusive use of a stream. 25da2e3ebdSchin ** 26da2e3ebdSchin ** Written by Kiem-Phong Vo. 27da2e3ebdSchin */ 28da2e3ebdSchin 29da2e3ebdSchin /* the main locking/unlocking interface */ 30da2e3ebdSchin #if __STD_C sfmutex(Sfio_t * f,int type)31da2e3ebdSchinint sfmutex(Sfio_t* f, int type) 32da2e3ebdSchin #else 33da2e3ebdSchin int sfmutex(f, type) 34da2e3ebdSchin Sfio_t* f; 35da2e3ebdSchin int type; 36da2e3ebdSchin #endif 37da2e3ebdSchin { 38da2e3ebdSchin #if !vt_threaded 39da2e3ebdSchin NOTUSED(f); NOTUSED(type); 40da2e3ebdSchin return 0; 41da2e3ebdSchin #else 42da2e3ebdSchin 43da2e3ebdSchin SFONCE(); 44da2e3ebdSchin 45da2e3ebdSchin if(!f) 46da2e3ebdSchin return -1; 47da2e3ebdSchin 48da2e3ebdSchin if(!f->mutex) 49da2e3ebdSchin { if(f->bits&SF_PRIVATE) 50da2e3ebdSchin return 0; 51da2e3ebdSchin 52da2e3ebdSchin vtmtxlock(_Sfmutex); 53da2e3ebdSchin f->mutex = vtmtxopen(NIL(Vtmutex_t*), VT_INIT); 54da2e3ebdSchin vtmtxunlock(_Sfmutex); 55da2e3ebdSchin if(!f->mutex) 56da2e3ebdSchin return -1; 57da2e3ebdSchin } 58da2e3ebdSchin 59da2e3ebdSchin if(type == SFMTX_LOCK) 60da2e3ebdSchin return vtmtxlock(f->mutex); 61da2e3ebdSchin else if(type == SFMTX_TRYLOCK) 62da2e3ebdSchin return vtmtxtrylock(f->mutex); 63da2e3ebdSchin else if(type == SFMTX_UNLOCK) 64da2e3ebdSchin return vtmtxunlock(f->mutex); 65da2e3ebdSchin else if(type == SFMTX_CLRLOCK) 66da2e3ebdSchin return vtmtxclrlock(f->mutex); 67da2e3ebdSchin else return -1; 68da2e3ebdSchin #endif /*vt_threaded*/ 69da2e3ebdSchin } 70