/
pthread_self.c
179 lines (164 loc) · 5.23 KB
/
pthread_self.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
* pthread_self.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
pthread_t
pthread_self (void)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function returns a reference to the current running
* thread.
*
* PARAMETERS
* N/A
*
*
* DESCRIPTION
* This function returns a reference to the current running
* thread.
*
* RESULTS
* pthread_t reference to the current thread
*
* ------------------------------------------------------
*/
{
pthread_t self;
pthread_t nil = {NULL, 0};
ptw32_thread_t * sp;
#if defined(_UWIN)
if (!ptw32_selfThreadKey)
return nil;
#endif
sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
if (sp != NULL)
{
self = sp->ptHandle;
}
else
{
int fail = PTW32_FALSE;
/*
* Need to create an implicit 'self' for the currently
* executing thread.
*/
self = ptw32_new ();
sp = (ptw32_thread_t *) self.p;
if (sp != NULL)
{
/*
* This is a non-POSIX thread which has chosen to call
* a POSIX threads function for some reason. We assume that
* it isn't joinable, but we do assume that it's
* (deferred) cancelable.
*/
sp->implicit = 1;
sp->detachState = PTHREAD_CREATE_DETACHED;
sp->thread = GetCurrentThreadId ();
#if defined(NEED_DUPLICATEHANDLE)
/*
* DuplicateHandle does not exist on WinCE.
*
* NOTE:
* GetCurrentThread only returns a pseudo-handle
* which is only valid in the current thread context.
* Therefore, you should not pass the handle to
* other threads for whatever purpose.
*/
sp->threadH = GetCurrentThread ();
#else
if (!DuplicateHandle (GetCurrentProcess (),
GetCurrentThread (),
GetCurrentProcess (),
&sp->threadH,
0, FALSE, DUPLICATE_SAME_ACCESS))
{
fail = PTW32_TRUE;
}
#endif
if (!fail)
{
#if defined(HAVE_CPU_AFFINITY)
/*
* Get this threads CPU affinity by temporarily setting the threads
* affinity to that of the process to get the old thread affinity,
* then reset to the old affinity.
*/
DWORD_PTR vThreadMask, vProcessMask, vSystemMask;
if (GetProcessAffinityMask(GetCurrentProcess(), &vProcessMask, &vSystemMask))
{
vThreadMask = SetThreadAffinityMask(sp->threadH, vProcessMask);
if (vThreadMask)
{
if (SetThreadAffinityMask(sp->threadH, vThreadMask))
{
sp->cpuset = (size_t) vThreadMask;
}
else fail = PTW32_TRUE;
}
else fail = PTW32_TRUE;
}
else fail = PTW32_TRUE;
#endif
/*
* No need to explicitly serialise access to sched_priority
* because the new handle is not yet public.
*/
sp->sched_priority = GetThreadPriority (sp->threadH);
pthread_setspecific (ptw32_selfThreadKey, (void *) sp);
}
}
if (fail)
{
/*
* Thread structs are never freed but are reused so if this
* continues to fail at least we don't leak memory.
*/
ptw32_threadReusePush (self);
/*
* As this is a win32 thread calling us and we have failed,
* return a value that makes sense to win32.
*/
return nil;
}
}
return (self);
}