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
|
// ============================================================================
// @(#)Task_Test.cpp 1.1 10/18/96
//
// = LIBRARY
// tests
//
// = FILENAME
// Task_Test.cpp
//
// = DESCRIPTION
// This test program illustrates how the ACE barrier
// synchronization mechanisms work in conjunction with the
// ACE_Task and the ACE_Thread_Manager.
//
// = AUTHOR
// Prashant Jain and Doug C. Schmidt
//
// ============================================================================
#include "ace/Log_Msg.h"
#if defined (ACE_HAS_THREADS)
#include "ace/Service_Config.h"
#include "ace/Task.h"
#include "test_config.h"
class Barrier_Task : public ACE_Task<ACE_MT_SYNCH>
{
public:
Barrier_Task (ACE_Thread_Manager *thr_mgr,
int n_threads,
int n_iterations);
virtual int svc (void);
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
private:
ACE_Barrier barrier_;
// Reference to the tester barrier. This controls each
// iteration of the tester function running in every thread.
int n_iterations_;
// Number of iterations to run.
// = Not needed for this test.
virtual int open (void *) { return 0; }
virtual int close (u_long) { return 0; }
virtual int put (ACE_Message_Block *, ACE_Time_Value *) { return 0; }
};
Barrier_Task::Barrier_Task (ACE_Thread_Manager *thr_mgr,
int n_threads,
int n_iterations)
: ACE_Task<ACE_MT_SYNCH> (thr_mgr),
barrier_ (n_threads),
n_iterations_ (n_iterations)
{
// Create worker threads.
if (this->activate (THR_NEW_LWP, n_threads) == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "activate failed"));
}
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
int
Barrier_Task::svc (void)
{
// Note that the ACE_Task::svc_run() method automatically adds us to
// the Thread_Manager when the thread begins.
ACE_NEW_THREAD;
for (int iterations = 1;
iterations <= this->n_iterations_;
iterations++)
{
ACE_DEBUG ((LM_DEBUG, "(%t) in iteration %d\n", iterations));
// Block until all other threads have waited, then continue.
this->barrier_.wait ();
}
// Note that the ACE_Task::svc_run() method automatically removes us
// from the Thread_Manager when the thread exits.
return 0;
}
int
main (int argc, char *argv[])
{
ACE_START_TEST;
int n_threads = ACE_MAX_THREADS;
int n_iterations = ACE_MAX_ITERATIONS;
Barrier_Task barrier_task (ACE_Service_Config::thr_mgr (),
n_threads,
n_iterations);
// Wait for all the threads to reach their exit point.
ACE_Service_Config::thr_mgr ()->wait ();
ACE_END_TEST;
return 0;
}
#else
int
main (int, char *[])
{
ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
return 0;
}
#endif /* ACE_HAS_THREADS */
|
