2 * Copyright (C) - 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License as published by the
6 * Free Software Foundation; version 2.1 of the License.
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include <common/compat/time.h>
20 #include <common/time.h>
29 #include <sys/types.h>
35 int64_t elapsed_time_ns(struct timespec
*t1
, struct timespec
*t2
)
37 struct timespec delta
;
40 delta
.tv_sec
= t2
->tv_sec
- t1
->tv_sec
;
41 delta
.tv_nsec
= t2
->tv_nsec
- t1
->tv_nsec
;
42 return ((int64_t) NSEC_PER_SEC
* (int64_t) delta
.tv_sec
) +
43 (int64_t) delta
.tv_nsec
;
46 int usleep_safe(useconds_t usec
)
49 struct timespec t1
, t2
;
50 int64_t time_remaining_ns
= (int64_t) usec
* (int64_t) NSEC_PER_USEC
;
52 ret
= lttng_clock_gettime(CLOCK_MONOTONIC
, &t1
);
55 perror("clock_gettime");
59 while (time_remaining_ns
> 0) {
60 ret
= usleep(time_remaining_ns
/ (int64_t) NSEC_PER_USEC
);
61 if (ret
&& errno
!= EINTR
) {
66 ret
= lttng_clock_gettime(CLOCK_MONOTONIC
, &t2
);
68 perror("clock_gettime");
72 time_remaining_ns
-= elapsed_time_ns(&t1
, &t2
);
78 int create_file(const char *path
)
86 ret
= creat(path
, S_IRWXU
);
101 int wait_on_file(const char *path
)
111 ret
= stat(path
, &buf
);
112 if (ret
== -1 && errno
== ENOENT
) {
113 ret
= poll(NULL
, 0, 10); /* 10 ms delay */
114 /* Should return 0 everytime */
120 "poll return value is larger than zero\n");
124 continue; /* retry */
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