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
|
/*
* once3.c
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* 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
*
* --------------------------------------------------------------------------
*
* Create several pthread_once objects and channel several threads
* through each. Make the init_routine cancelable and cancel them with
* waiters waiting.
*
* Depends on API functions:
* pthread_once()
* pthread_create()
* pthread_testcancel()
* pthread_cancel()
* pthread_once()
*/
#define ASSERT_TRACE
#include "test.h"
#define NUM_THREADS 100 /* Targeting each once control */
#define NUM_ONCE 10
pthread_once_t o = PTHREAD_ONCE_INIT;
pthread_once_t once[NUM_ONCE];
typedef struct {
int i;
CRITICAL_SECTION cs;
} sharedInt_t;
static sharedInt_t numOnce = {0, {0}};
static sharedInt_t numThreads = {0, {0}};
void
myfunc(void)
{
EnterCriticalSection(&numOnce.cs);
numOnce.i++;
assert(numOnce.i > 0);
LeaveCriticalSection(&numOnce.cs);
/* Simulate slow once routine so that following threads pile up behind it */
Sleep(10);
/* test for cancelation late so we're sure to have waiters. */
pthread_testcancel();
}
void *
mythread(void * arg)
{
/*
* Cancel every thread. These threads are deferred cancelable only, so
* only the thread performing the once routine (my_func) will see it (there are
* no other cancelation points here). The result will be that every thread
* eventually cancels only when it becomes the new once thread.
*/
assert(pthread_cancel(pthread_self()) == 0);
assert(pthread_once(&once[(int) arg], myfunc) == 0);
EnterCriticalSection(&numThreads.cs);
numThreads.i++;
LeaveCriticalSection(&numThreads.cs);
return 0;
}
int
main()
{
pthread_t t[NUM_THREADS][NUM_ONCE];
int i, j;
InitializeCriticalSection(&numThreads.cs);
InitializeCriticalSection(&numOnce.cs);
for (j = 0; j < NUM_ONCE; j++)
{
once[j] = o;
for (i = 0; i < NUM_THREADS; i++)
{
assert(pthread_create(&t[i][j], NULL, mythread, (void *) j) == 0);
}
}
for (j = 0; j < NUM_ONCE; j++)
for (i = 0; i < NUM_THREADS; i++)
if (pthread_join(t[i][j], NULL) != 0)
printf("Join failed for [thread,once] = [%d,%d]\n", i, j);
/*
* All threads will cancel, none will return normally from
* pthread_once and so numThreads should never be incremented. However,
* numOnce should be incremented by every thread (NUM_THREADS*NUM_ONCE).
*/
assert(numOnce.i == NUM_ONCE * NUM_THREADS);
assert(numThreads.i == 0);
DeleteCriticalSection(&numOnce.cs);
DeleteCriticalSection(&numThreads.cs);
return 0;
}
|
