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@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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39
40 pthread_t
pthread_self(void)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