14887Schin /*********************************************************************** 24887Schin * * 34887Schin * This software is part of the ast package * 4*12068SRoger.Faulkner@Oracle.COM * Copyright (c) 1985-2010 AT&T Intellectual Property * 54887Schin * and is licensed under the * 64887Schin * Common Public License, Version 1.0 * 78462SApril.Chin@Sun.COM * by AT&T Intellectual Property * 84887Schin * * 94887Schin * A copy of the License is available at * 104887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 124887Schin * * 134887Schin * Information and Software Systems Research * 144887Schin * AT&T Research * 154887Schin * Florham Park NJ * 164887Schin * * 174887Schin * Glenn Fowler <gsf@research.att.com> * 184887Schin * David Korn <dgk@research.att.com> * 194887Schin * Phong Vo <kpv@research.att.com> * 204887Schin * * 214887Schin ***********************************************************************/ 224887Schin #include "sfhdr.h" 234887Schin 244887Schin /* Obtain/release exclusive use of a stream. 254887Schin ** 264887Schin ** Written by Kiem-Phong Vo. 274887Schin */ 284887Schin 294887Schin /* the main locking/unlocking interface */ 304887Schin #if __STD_C sfmutex(Sfio_t * f,int type)314887Schinint sfmutex(Sfio_t* f, int type) 324887Schin #else 334887Schin int sfmutex(f, type) 344887Schin Sfio_t* f; 354887Schin int type; 364887Schin #endif 374887Schin { 384887Schin #if !vt_threaded 394887Schin NOTUSED(f); NOTUSED(type); 404887Schin return 0; 414887Schin #else 424887Schin 434887Schin SFONCE(); 444887Schin 454887Schin if(!f) 464887Schin return -1; 474887Schin 484887Schin if(!f->mutex) 494887Schin { if(f->bits&SF_PRIVATE) 504887Schin return 0; 514887Schin 524887Schin vtmtxlock(_Sfmutex); 534887Schin f->mutex = vtmtxopen(NIL(Vtmutex_t*), VT_INIT); 544887Schin vtmtxunlock(_Sfmutex); 554887Schin if(!f->mutex) 564887Schin return -1; 574887Schin } 584887Schin 594887Schin if(type == SFMTX_LOCK) 604887Schin return vtmtxlock(f->mutex); 614887Schin else if(type == SFMTX_TRYLOCK) 624887Schin return vtmtxtrylock(f->mutex); 634887Schin else if(type == SFMTX_UNLOCK) 644887Schin return vtmtxunlock(f->mutex); 654887Schin else if(type == SFMTX_CLRLOCK) 664887Schin return vtmtxclrlock(f->mutex); 674887Schin else return -1; 684887Schin #endif /*vt_threaded*/ 694887Schin } 70