1 /* 2 * pthread_self.c 3 * 4 * Description: 5 * This translation unit implements miscellaneous thread functions. 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj (at) callisto.canberra.edu.au 14 * 15 * The current list of contributors is contained 16 * in the file CONTRIBUTORS included with the source 17 * code distribution. The list can also be seen at the 18 * following World Wide Web location: 19 * http://sources.redhat.com/pthreads-win32/contributors.html 20 * 21 * This library is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU Lesser General Public 23 * License as published by the Free Software Foundation; either 24 * version 2 of the License, or (at your option) any later version. 25 * 26 * This library is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * Lesser General Public License for more details. 30 * 31 * You should have received a copy of the GNU Lesser General Public 32 * License along with this library in the file COPYING.LIB; 33 * if not, write to the Free Software Foundation, Inc., 34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 35 */ 36 37 #include "pthread.h" 38 #include "implement.h" 39 40 pthread_t 41 pthread_self (void) 42 /* 43 * ------------------------------------------------------ 44 * DOCPUBLIC 45 * This function returns a reference to the current running 46 * thread. 47 * 48 * PARAMETERS 49 * N/A 50 * 51 * 52 * DESCRIPTION 53 * This function returns a reference to the current running 54 * thread. 55 * 56 * RESULTS 57 * pthread_t reference to the current thread 58 * 59 * ------------------------------------------------------ 60 */ 61 { 62 pthread_t self; 63 pthread_t nil = {NULL, 0}; 64 ptw32_thread_t * sp; 65 66 #if defined(_UWIN) 67 if (!ptw32_selfThreadKey) 68 return nil; 69 #endif 70 71 sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey); 72 73 if (sp != NULL) 74 { 75 self = sp->ptHandle; 76 } 77 else 78 { 79 /* 80 * Need to create an implicit 'self' for the currently 81 * executing thread. 82 */ 83 self = ptw32_new (); 84 sp = (ptw32_thread_t *) self.p; 85 86 if (sp != NULL) 87 { 88 /* 89 * This is a non-POSIX thread which has chosen to call 90 * a POSIX threads function for some reason. We assume that 91 * it isn't joinable, but we do assume that it's 92 * (deferred) cancelable. 93 */ 94 sp->implicit = 1; 95 sp->detachState = PTHREAD_CREATE_DETACHED; 96 sp->thread = GetCurrentThreadId (); 97 98 #if defined(NEED_DUPLICATEHANDLE) 99 /* 100 * DuplicateHandle does not exist on WinCE. 101 * 102 * NOTE: 103 * GetCurrentThread only returns a pseudo-handle 104 * which is only valid in the current thread context. 105 * Therefore, you should not pass the handle to 106 * other threads for whatever purpose. 107 */ 108 sp->threadH = GetCurrentThread (); 109 #else 110 if (!DuplicateHandle (GetCurrentProcess (), 111 GetCurrentThread (), 112 GetCurrentProcess (), 113 &sp->threadH, 114 0, FALSE, DUPLICATE_SAME_ACCESS)) 115 { 116 /* 117 * Should not do this, but we have no alternative if 118 * we can't get a Win32 thread handle. 119 * Thread structs are never freed. 120 */ 121 ptw32_threadReusePush (self); 122 /* 123 * As this is a win32 thread calling us and we have failed, 124 * return a value that makes sense to win32. 125 */ 126 return nil; 127 } 128 #endif 129 130 /* 131 * No need to explicitly serialise access to sched_priority 132 * because the new handle is not yet public. 133 */ 134 sp->sched_priority = GetThreadPriority (sp->threadH); 135 pthread_setspecific (ptw32_selfThreadKey, (void *) sp); 136 } 137 } 138 139 return (self); 140 141 } /* pthread_self */ 142
