| 1 | /* |
| 2 | * Basic workqueue like code, that sets up a thread and allows async |
| 3 | * processing of some sort. Could be extended to allow for multiple |
| 4 | * worker threads. But right now fio associates one of this per IO |
| 5 | * thread, so should be enough to have just a single thread doing the |
| 6 | * work. |
| 7 | */ |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <stdarg.h> |
| 11 | #include <unistd.h> |
| 12 | #include <errno.h> |
| 13 | #include <pthread.h> |
| 14 | #include <string.h> |
| 15 | |
| 16 | #include "../smalloc.h" |
| 17 | #include "../log.h" |
| 18 | #include "tp.h" |
| 19 | |
| 20 | static void tp_flush_work(struct flist_head *list) |
| 21 | { |
| 22 | struct tp_work *work; |
| 23 | |
| 24 | while (!flist_empty(list)) { |
| 25 | int prio; |
| 26 | |
| 27 | work = flist_entry(list->next, struct tp_work, list); |
| 28 | flist_del(&work->list); |
| 29 | |
| 30 | prio = work->prio; |
| 31 | if (nice(prio) < 0) |
| 32 | log_err("fio: nice %s\n", strerror(errno)); |
| 33 | |
| 34 | work->fn(work); |
| 35 | |
| 36 | if (nice(prio) < 0) |
| 37 | log_err("fio: nice %s\n", strerror(errno)); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | static void *tp_thread(void *data) |
| 42 | { |
| 43 | struct tp_data *tdat = data; |
| 44 | struct flist_head work_list; |
| 45 | |
| 46 | INIT_FLIST_HEAD(&work_list); |
| 47 | |
| 48 | while (1) { |
| 49 | pthread_mutex_lock(&tdat->lock); |
| 50 | |
| 51 | if (!tdat->thread_exit && flist_empty(&tdat->work)) |
| 52 | pthread_cond_wait(&tdat->cv, &tdat->lock); |
| 53 | |
| 54 | if (!flist_empty(&tdat->work)) |
| 55 | flist_splice_tail_init(&tdat->work, &work_list); |
| 56 | |
| 57 | pthread_mutex_unlock(&tdat->lock); |
| 58 | |
| 59 | if (flist_empty(&work_list)) { |
| 60 | if (tdat->thread_exit) |
| 61 | break; |
| 62 | continue; |
| 63 | } |
| 64 | |
| 65 | tp_flush_work(&work_list); |
| 66 | } |
| 67 | |
| 68 | return NULL; |
| 69 | } |
| 70 | |
| 71 | void tp_queue_work(struct tp_data *tdat, struct tp_work *work) |
| 72 | { |
| 73 | work->done = 0; |
| 74 | |
| 75 | pthread_mutex_lock(&tdat->lock); |
| 76 | flist_add_tail(&work->list, &tdat->work); |
| 77 | pthread_mutex_unlock(&tdat->lock); |
| 78 | |
| 79 | pthread_cond_signal(&tdat->cv); |
| 80 | } |
| 81 | |
| 82 | void tp_init(struct tp_data **tdatp) |
| 83 | { |
| 84 | struct tp_data *tdat; |
| 85 | int ret; |
| 86 | |
| 87 | if (*tdatp) |
| 88 | return; |
| 89 | |
| 90 | *tdatp = tdat = smalloc(sizeof(*tdat)); |
| 91 | pthread_mutex_init(&tdat->lock, NULL); |
| 92 | INIT_FLIST_HEAD(&tdat->work); |
| 93 | pthread_cond_init(&tdat->cv, NULL); |
| 94 | pthread_cond_init(&tdat->sleep_cv, NULL); |
| 95 | |
| 96 | ret = pthread_create(&tdat->thread, NULL, tp_thread, tdat); |
| 97 | if (ret) |
| 98 | log_err("fio: failed to create tp thread\n"); |
| 99 | } |
| 100 | |
| 101 | void tp_exit(struct tp_data **tdatp) |
| 102 | { |
| 103 | struct tp_data *tdat = *tdatp; |
| 104 | void *ret; |
| 105 | |
| 106 | if (!tdat) |
| 107 | return; |
| 108 | |
| 109 | pthread_mutex_lock(&tdat->lock); |
| 110 | tdat->thread_exit = 1; |
| 111 | pthread_mutex_unlock(&tdat->lock); |
| 112 | |
| 113 | pthread_cond_signal(&tdat->cv); |
| 114 | |
| 115 | pthread_join(tdat->thread, &ret); |
| 116 | |
| 117 | sfree(tdat); |
| 118 | *tdatp = NULL; |
| 119 | } |