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
|
/*
* Copyright (c) 2018, Cornell University
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of Cornell University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Tuan Ta
*/
//------------------------------------------------------------------------
// sysfutex1_d tests basic functionalities of futex system call:
// - make some threads wait on a variable
// - wake up all threads waiting on a variable
//------------------------------------------------------------------------
#include "riscv_test.h"
#include "test_macros.h"
#include "test_macros_mt_ecall.h"
RVTEST_RV64U
RVTEST_CODE_BEGIN
#define MAX_NUM_THREADS 20
//------------------------------------------------------------------------
// Master thread creates new threads, call _master function, waits for all
// threads to complete, deallocates threads and checks result
//------------------------------------------------------------------------
li a0, MAX_NUM_THREADS
call _create_threads
la t6, n_worker_threads
ld a0, (t6)
beqz a0, _fail // exit if there's no worker thread
call _master_work
la t6, n_worker_threads
ld a0, (t6)
call _join
la t6, n_worker_threads
ld a0, (t6)
call _check
la t6, n_worker_threads
ld a0, (t6)
call _delete_threads
li a0, SUCCESS
RVTEST_CODE_END
//------------------------------------------------------------------------
// master_work function executed by the parent/master thread
//
// - wake up all threads waiting on futex_X
//------------------------------------------------------------------------
_master_work:
mv s0, ra // save return address
li t0, 0 // number of threads that have been waken
la t1, n_worker_threads
ld t1, (t1)
1:
// futex(futex_X, FUTEX_WAKE_PRIVATE, n_worker_threads)
la a0, futex_X
li a1, FUTEX_WAKE_PRIVATE
li a2, 1 // wake up at most 1 thread
li a7, SYSCALL_FUTEX
ecall
add t0, t0, a0 // track the number of waken threads so far
// keep waking up until all threads are waken up
blt t0, t1, 1b
// restore return address and return
mv ra, s0
ret
//------------------------------------------------------------------------
// mt_test function executed by child threads
//
// Wait on futex_X
//------------------------------------------------------------------------
_mt_test:
// futex(futex_X, FUTEX_WAIT_PRIVATE, 1)
la a0, futex_X
li a1, FUTEX_WAIT_PRIVATE
li a2, 0 // expected val of futex_X
li a7, SYSCALL_FUTEX
ecall
RVTEST_CODE_END
//------------------------------------------------------------------------
// _check:
// Each thread should do LOOP_COUNT iterations
//------------------------------------------------------------------------
_check:
ret
_fail:
li a0, FAILURE
RVTEST_CODE_END
.data
futex_X: .dword 0
futex_Y: .dword 0
count_master: .dword 0
count_child: .dword 0
MT_DATA
|
