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
|
/* $OpenBSD: rthread_debug.c,v 1.1 2005/12/31 21:40:43 marc Exp $ */
/* $snafu: rthread_debug.c,v 1.2 2004/12/09 18:41:44 marc Exp $ */
/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
#define _POSIX_THREADS
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <machine/spinlock.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include "rthread.h"
int _rthread_debug_level;
/*
* Note: messages truncated at 255 characters. Could use vasprintf,
* but don't want to use malloc here so the function can be used
* in signal handlers.
*/
#define MAX_MSG_LEN 256
#define RTHREAD_ENV_DEBUG "RTHREAD_DEBUG"
/*
* format and send output to stderr if the given "level" is less than or
* equal to the current debug level. Messages with a level <= 0 will
* always be printed.
*/
void
_rthread_debug(int level, const char *fmt, ...)
{
char msg[MAX_MSG_LEN];
char *p;
int cnt;
ssize_t c;
if (_rthread_debug_level >= level) {
va_list ap;
va_start(ap, fmt);
cnt = vsnprintf(msg, MAX_MSG_LEN, fmt, ap);
va_end(ap);
if (cnt > MAX_MSG_LEN - 1)
cnt = MAX_MSG_LEN - 1;
p = msg;
do {
c = write(STDERR_FILENO, p, cnt);
if (c == -1)
break;
if (c != cnt)
sched_yield();
p += c;
cnt -= c;
} while (cnt > 0);
}
}
/*
* set the debug level from an environment string. Bogus values are
* silently ignored.
*/
void
_rthread_debug_init(void)
{
char *envp;
char *rem;
envp = getenv(RTHREAD_ENV_DEBUG);
if (envp) {
_rthread_debug_level = (int) strtol(envp, &rem, 0);
if (*rem || _rthread_debug_level < 0)
_rthread_debug_level = 0;
}
}
|
