Commit | Line | Data |
---|---|---|
39ab7da2 JA |
1 | #include <unistd.h> |
2 | #include <math.h> | |
3 | #include <sys/time.h> | |
4 | #include <time.h> | |
5 | ||
6 | #include "fio.h" | |
7 | #include "smalloc.h" | |
8 | ||
9 | struct timeval *fio_tv; | |
10 | int fio_gtod_offload = 0; | |
11 | int fio_gtod_cpu = -1; | |
12 | static pthread_t gtod_thread; | |
13 | ||
14 | void fio_gtod_init(void) | |
15 | { | |
16 | fio_tv = smalloc(sizeof(struct timeval)); | |
17 | assert(fio_tv); | |
18 | } | |
19 | ||
20 | static void fio_gtod_update(void) | |
21 | { | |
22 | gettimeofday(fio_tv, NULL); | |
23 | } | |
24 | ||
25 | static void *gtod_thread_main(void *data) | |
26 | { | |
27 | struct fio_mutex *mutex = data; | |
28 | ||
29 | fio_mutex_up(mutex); | |
30 | ||
31 | /* | |
32 | * As long as we have jobs around, update the clock. It would be nice | |
33 | * to have some way of NOT hammering that CPU with gettimeofday(), | |
34 | * but I'm not sure what to use outside of a simple CPU nop to relax | |
35 | * it - we don't want to lose precision. | |
36 | */ | |
37 | while (threads) { | |
38 | fio_gtod_update(); | |
39 | nop; | |
40 | } | |
41 | ||
42 | return NULL; | |
43 | } | |
44 | ||
45 | int fio_start_gtod_thread(void) | |
46 | { | |
47 | struct fio_mutex *mutex; | |
48 | pthread_attr_t attr; | |
49 | int ret; | |
50 | ||
51 | mutex = fio_mutex_init(FIO_MUTEX_LOCKED); | |
52 | if (!mutex) | |
53 | return 1; | |
54 | ||
55 | pthread_attr_init(&attr); | |
56 | pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN); | |
57 | ret = pthread_create(>od_thread, &attr, gtod_thread_main, NULL); | |
58 | pthread_attr_destroy(&attr); | |
59 | if (ret) { | |
60 | log_err("Can't create gtod thread: %s\n", strerror(ret)); | |
61 | goto err; | |
62 | } | |
63 | ||
64 | ret = pthread_detach(gtod_thread); | |
65 | if (ret) { | |
66 | log_err("Can't detatch gtod thread: %s\n", strerror(ret)); | |
67 | goto err; | |
68 | } | |
69 | ||
70 | dprint(FD_MUTEX, "wait on startup_mutex\n"); | |
71 | fio_mutex_down(mutex); | |
72 | dprint(FD_MUTEX, "done waiting on startup_mutex\n"); | |
73 | err: | |
74 | fio_mutex_remove(mutex); | |
75 | return ret; | |
76 | } | |
77 | ||
78 |