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
|
//===-- main.cpp ------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// C includes
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
// C++ includes
#include <chrono>
#include <mutex>
#include <random>
#include <thread>
std::thread g_thread_1;
std::thread g_thread_2;
std::thread g_thread_3;
std::mutex g_mask_mutex;
typedef enum {
eGet,
eAssign,
eClearBits
} MaskAction;
uint32_t mask_access (MaskAction action, uint32_t mask = 0);
uint32_t
mask_access (MaskAction action, uint32_t mask)
{
static uint32_t g_mask = 0;
std::lock_guard<std::mutex> lock(g_mask_mutex);
switch (action)
{
case eGet:
break;
case eAssign:
g_mask |= mask;
break;
case eClearBits:
g_mask &= ~mask;
break;
}
return g_mask;
}
void *
thread_func (void *arg)
{
uint32_t thread_index = *((uint32_t *)arg);
uint32_t thread_mask = (1u << (thread_index));
printf ("%s (thread index = %u) startng...\n", __FUNCTION__, thread_index);
std::default_random_engine generator;
std::uniform_int_distribution<int> distribution(0, 3000000);
while (mask_access(eGet) & thread_mask)
{
// random micro second sleep from zero to 3 seconds
int usec = distribution(generator);
printf ("%s (thread = %u) doing a usleep (%d)...\n", __FUNCTION__, thread_index, usec);
std::chrono::microseconds duration(usec);
std::this_thread::sleep_for(duration);
printf ("%s (thread = %u) after usleep ...\n", __FUNCTION__, thread_index); // Set break point at this line.
}
printf ("%s (thread index = %u) exiting...\n", __FUNCTION__, thread_index);
return NULL;
}
int main (int argc, char const *argv[])
{
uint32_t thread_index_1 = 1;
uint32_t thread_index_2 = 2;
uint32_t thread_index_3 = 3;
uint32_t thread_mask_1 = (1u << thread_index_1);
uint32_t thread_mask_2 = (1u << thread_index_2);
uint32_t thread_mask_3 = (1u << thread_index_3);
// Make a mask that will keep all threads alive
mask_access (eAssign, thread_mask_1 | thread_mask_2 | thread_mask_3); // And that line.
// Create 3 threads
g_thread_1 = std::thread(thread_func, (void*)&thread_index_1);
g_thread_2 = std::thread(thread_func, (void*)&thread_index_2);
g_thread_3 = std::thread(thread_func, (void*)&thread_index_3);
char line[64];
while (mask_access(eGet) != 0)
{
printf ("Enter thread index to kill or ENTER for all:\n");
fflush (stdout);
// Kill threads by index, or ENTER for all threads
if (fgets (line, sizeof(line), stdin))
{
if (line[0] == '\n' || line[0] == '\r' || line[0] == '\0')
{
printf ("Exiting all threads...\n");
break;
}
int32_t index = strtoul (line, NULL, 0);
switch (index)
{
case 1: mask_access (eClearBits, thread_mask_1); break;
case 2: mask_access (eClearBits, thread_mask_2); break;
case 3: mask_access (eClearBits, thread_mask_3); break;
}
continue;
}
break;
}
// Clear all thread bits to they all exit
mask_access (eClearBits, UINT32_MAX);
// Join all of our threads
g_thread_1.join();
g_thread_2.join();
g_thread_3.join();
return 0;
}
|
