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27
28
29/*
30 *  Test case for util_barrier.
31 *
32 *  The test succeeds if no thread exits before all the other threads reach
33 *  the barrier.
34 */
35
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include "util/os_time.h"
42#include "util/u_atomic.h"
43#include "util/u_thread.h"
44
45
46#define NUM_THREADS 10
47
48static int verbosity = 0;
49
50static thrd_t threads[NUM_THREADS];
51static util_barrier barrier;
52static int thread_ids[NUM_THREADS];
53
54static volatile int waiting = 0;
55static volatile int proceeded = 0;
56
57
58#define LOG(fmt, ...) \
59   if (verbosity > 0) { \
60      fprintf(stdout, fmt, ##__VA_ARGS__); \
61   }
62
63#define CHECK(_cond) \
64   if (!(_cond)) { \
65      fprintf(stderr, "%s:%u: `%s` failed\n", __FILE__, __LINE__, #_cond); \
66      _exit(EXIT_FAILURE); \
67   }
68
69
70static int
71thread_function(void *thread_data)
72{
73   int thread_id = *((int *) thread_data);
74
75   LOG("thread %d starting\n", thread_id);
76   os_time_sleep(thread_id * 100 * 1000);
77   LOG("thread %d before barrier\n", thread_id);
78
79   CHECK(p_atomic_read(&proceeded) == 0);
80   p_atomic_inc(&waiting);
81
82   util_barrier_wait(&barrier);
83
84   CHECK(p_atomic_read(&waiting) == NUM_THREADS);
85
86   p_atomic_inc(&proceeded);
87
88   LOG("thread %d exiting\n", thread_id);
89
90   return 0;
91}
92
93
94int main(int argc, char *argv[])
95{
96   int i;
97
98   for (i = 1; i < argc; ++i) {
99      const char *arg = argv[i];
100      if (strcmp(arg, "-v") == 0) {
101         ++verbosity;
102      } else {
103         fprintf(stderr, "error: unrecognized option `%s`\n", arg);
104         exit(EXIT_FAILURE);
105      }
106   }
107
108   // Disable buffering
109   setbuf(stdout, NULL);
110
111   LOG("pipe_barrier_test starting\n");
112
113   util_barrier_init(&barrier, NUM_THREADS);
114
115   for (i = 0; i < NUM_THREADS; i++) {
116      thread_ids[i] = i;
117      threads[i] = u_thread_create(thread_function, (void *) &thread_ids[i]);
118   }
119
120   for (i = 0; i < NUM_THREADS; i++ ) {
121      thrd_join(threads[i], NULL);
122   }
123
124   CHECK(p_atomic_read(&proceeded) == NUM_THREADS);
125
126   util_barrier_destroy(&barrier);
127
128   LOG("pipe_barrier_test exiting\n");
129
130   return 0;
131}
132