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4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
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18 * You should have received a copy of the GNU Lesser General Public
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24 * $XConsortium: atomic_lock.C /main/4 1996/11/01 10:19:09 drk $
26 * Copyright (c) 1993 HAL Computer Systems International, Ltd.
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51 #include "atomic_lock.h"
53 #include <X11/Xosdefs.h>
59 atomic_lock::atomic_lock(const char* p)
61 int len = MIN(strlen(p), PATHSIZ - 1);
62 *((char *) memcpy(v_path, p, len) + len) = '\0';
65 atomic_lock::~atomic_lock()
69 /////////////////////////////////////////
70 // from Rochkind's Adv. UNIX programming
71 /////////////////////////////////////////
72 Boolean atomic_lock::lock()
78 while ( (fd = creat(v_path, 0)) == -1 && errno == EACCES ) {
79 if ( ++tries >= MAXTRIES )
83 if ( fd == -1 || close(fd) == -1 ) {
90 Boolean atomic_lock::unlock()
92 if ( unlink(v_path) == -1 ) {
93 MESSAGE(cerr, "unlock(): unlink() failed");
94 throw(systemException(errno));