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
|
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2022 OmniOS Community Edition (OmniOSce) Association.
*/
#include <atomic.h>
#include <err.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>
#include <unistd.h>
#include <sys/debug.h>
#include <sys/types.h>
static __thread uint64_t tlsvar;
static ucontext_t ctx;
static uint32_t failures;
static pthread_t tid;
#define THREAD1_VALUE 0x1010
#define THREAD2_VALUE 0x0202
void
report(char *tag)
{
pthread_t ltid = pthread_self();
printf(" %-14s: thread=%x, TLS variable=%x\n",
tag, (uint_t)ltid, tlsvar);
}
void
run(void)
{
pthread_t ltid = pthread_self();
printf("Coroutine started from second thread\n");
report("coroutine");
if (ltid != tid) {
fprintf(stderr,
"FAIL: coroutine thread ID is %x, expected %x\n",
ltid, tid);
atomic_inc_32(&failures);
}
if (tlsvar != THREAD2_VALUE) {
fprintf(stderr,
"FAIL: coroutine TLS variable is %x, expected %x\n",
tlsvar, THREAD2_VALUE);
atomic_inc_32(&failures);
}
}
void *
thread(void *arg __unused)
{
tlsvar = THREAD2_VALUE;
report("second thread");
/*
* setcontext() does not return if successful, checking the return
* value upsets smatch.
*/
(void) setcontext(&ctx);
errx(EXIT_FAILURE, "setcontext() returned and should not have.");
return (NULL);
}
int
main(void)
{
char stk[SIGSTKSZ];
void *status;
tlsvar = THREAD1_VALUE;
report("main thread");
VERIFY0(getcontext(&ctx));
ctx.uc_link = NULL;
ctx.uc_stack.ss_sp = stk;
ctx.uc_stack.ss_size = sizeof (stk);
makecontext(&ctx, run, 0);
VERIFY0(pthread_create(&tid, NULL, thread, NULL));
VERIFY0(pthread_join(tid, &status));
return (failures == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
|
