sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 1 | #define _GNU_SOURCE |
| 2 | #include <string.h> |
| 3 | #include <pthread.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <stdio.h> |
| 6 | #include <fcntl.h> |
| 7 | #include <unistd.h> |
| 8 | #include <sys/types.h> |
| 9 | #include <sys/syscall.h> |
| 10 | #include <sched.h> |
| 11 | |
| 12 | static int loops = 15; // each thread+main will do this amount of loop |
| 13 | static int sleepms = 1000; // in each loop, will sleep "sleepms" milliseconds |
| 14 | static int burn = 0; // after each sleep, will burn cpu in a tight 'burn' loop |
| 15 | |
| 16 | |
| 17 | static pid_t gettid() |
| 18 | { |
| 19 | #ifdef __NR_gettid |
| 20 | return syscall(__NR_gettid); |
| 21 | #else |
| 22 | return getpid(); |
| 23 | #endif |
| 24 | } |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 25 | // will be invoked from gdb. |
bart | 667c677 | 2011-05-08 09:29:06 +0000 | [diff] [blame] | 26 | static void whoami(char *msg) __attribute__((unused)); |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 27 | static void whoami(char *msg) |
| 28 | { |
| 29 | fprintf(stderr, "pid %d Thread %d %s\n", getpid(), gettid(), msg); |
| 30 | fflush(stderr); |
| 31 | } |
| 32 | |
| 33 | |
| 34 | static void do_burn () |
| 35 | { |
| 36 | int i; |
| 37 | int loopnr = 0; |
| 38 | // one single line for the below, to ensure interrupt on this line. |
| 39 | for (i = 0; i < burn; i++) loopnr++; |
| 40 | } |
| 41 | |
| 42 | static int thread_ready = 0; |
| 43 | static pthread_cond_t ready = PTHREAD_COND_INITIALIZER; |
| 44 | static pthread_mutex_t ready_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 45 | static void signal_ready (void) |
| 46 | { |
| 47 | int rc; |
| 48 | rc = pthread_mutex_lock(&ready_mutex); |
| 49 | if (rc != 0) |
| 50 | fprintf(stderr, "signal_ready lock error %d_n", rc); |
| 51 | thread_ready = 1; |
| 52 | rc = pthread_cond_signal(&ready); |
| 53 | if (rc != 0) |
| 54 | fprintf(stderr, "signal_ready signal error %d_n", rc); |
| 55 | rc = pthread_mutex_unlock(&ready_mutex); |
| 56 | if (rc != 0) |
| 57 | fprintf(stderr, "signal_ready unlock error %d_n", rc); |
| 58 | } |
| 59 | |
| 60 | struct spec { |
| 61 | char *name; |
| 62 | int sleep; |
| 63 | int burn; |
| 64 | int t; |
| 65 | }; |
| 66 | static struct timeval t[4]; |
| 67 | static int nr_sleeper_or_burner = 0; |
| 68 | static volatile int report_finished = 1; |
| 69 | // set to 0 to have no finish msg (as order is non-deterministic) |
| 70 | static void *sleeper_or_burner(void *v) |
| 71 | { |
| 72 | int i = 0; |
| 73 | struct spec* s = (struct spec*)v; |
| 74 | |
| 75 | fprintf(stderr, "%s ready to sleep and/or burn\n", s->name); |
| 76 | fflush (stderr); |
| 77 | signal_ready(); |
| 78 | nr_sleeper_or_burner++; |
| 79 | |
| 80 | for (i = 0; i < loops; i++) { |
| 81 | if (sleepms > 0 && s->sleep) { |
| 82 | t[s->t].tv_sec = sleepms / 1000; |
| 83 | t[s->t].tv_usec = (sleepms % 1000) * 1000; |
| 84 | select (0, NULL, NULL, NULL, &t[s->t]); |
| 85 | } |
| 86 | if (burn > 0 && s->burn) |
| 87 | do_burn(); |
| 88 | } |
| 89 | if (report_finished) { |
| 90 | fprintf(stderr, "%s finished to sleep and/or burn\n", s->name); |
| 91 | fflush (stderr); |
| 92 | } |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | // wait till a thread signals it is ready |
| 97 | static void wait_ready(void) |
| 98 | { |
| 99 | int rc; |
| 100 | rc = pthread_mutex_lock(&ready_mutex); |
| 101 | if (rc != 0) |
| 102 | fprintf(stderr, "wait_ready lock error %d_n", rc); |
| 103 | while (! thread_ready && rc == 0) { |
| 104 | rc = pthread_cond_wait(&ready, &ready_mutex); |
| 105 | if (rc != 0) |
| 106 | fprintf(stderr, "wait_ready wait error %d_n", rc); |
| 107 | } |
| 108 | thread_ready = 0; |
| 109 | rc = pthread_mutex_unlock(&ready_mutex); |
| 110 | if (rc != 0) |
| 111 | fprintf(stderr, "wait_ready unlock error %d_n", rc); |
| 112 | } |
| 113 | |
| 114 | // We will lock ourselves on one single cpu. |
| 115 | // This bypasses the unfairness of the Valgrind scheduler |
| 116 | // when a multi-cpu machine has enough cpu to run all the |
| 117 | // threads wanting to burn cpu. |
| 118 | static void setaffinity(void) |
| 119 | { |
| 120 | #ifdef VGO_linux |
| 121 | cpu_set_t single_cpu; |
| 122 | CPU_ZERO(&single_cpu); |
| 123 | CPU_SET(1, &single_cpu); |
| 124 | (void) sched_setaffinity(0, sizeof(single_cpu), &single_cpu); |
| 125 | #endif |
| 126 | // GDBTD: equivalent for Darwin ? |
| 127 | } |
| 128 | |
| 129 | int main (int argc, char *argv[]) |
| 130 | { |
| 131 | char *threads_spec; |
| 132 | pthread_t ebbr, egll, zzzz; |
| 133 | struct spec b, l, p, m; |
bart | 667c677 | 2011-05-08 09:29:06 +0000 | [diff] [blame] | 134 | char *some_mem __attribute__((unused)) = malloc(100); |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 135 | setaffinity(); |
| 136 | |
| 137 | if (argc > 1) |
| 138 | loops = atoi(argv[1]); |
| 139 | |
| 140 | if (argc > 2) |
| 141 | sleepms = atoi(argv[2]); |
| 142 | |
| 143 | if (argc > 3) |
| 144 | burn = atoll(argv[3]); |
| 145 | |
| 146 | if (argc > 4) |
| 147 | threads_spec = argv[4]; |
| 148 | else |
| 149 | threads_spec = "BSBSBSBS"; |
| 150 | |
| 151 | fprintf(stderr, "loops/sleep_ms/burn/threads_spec: %d %d %d %s\n", |
| 152 | loops, sleepms, burn, threads_spec); |
| 153 | fflush(stderr); |
| 154 | |
| 155 | b.name = "Brussels"; |
| 156 | b.burn = *threads_spec++ == 'B'; |
| 157 | b.sleep = *threads_spec++ == 'S'; |
sewardj | eefeeb7 | 2011-05-10 11:01:07 +0000 | [diff] [blame] | 158 | b.t = -1; |
| 159 | if (b.burn || b.sleep) { |
| 160 | b.t = 1; |
| 161 | pthread_create(&ebbr, NULL, sleeper_or_burner, &b); |
| 162 | wait_ready(); |
| 163 | } |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 164 | |
| 165 | l.name = "London"; |
| 166 | l.burn = *threads_spec++ == 'B'; |
| 167 | l.sleep = *threads_spec++ == 'S'; |
sewardj | eefeeb7 | 2011-05-10 11:01:07 +0000 | [diff] [blame] | 168 | l.t = -1; |
| 169 | if (l.burn || l.sleep) { |
| 170 | l.t = 2; |
| 171 | pthread_create(&egll, NULL, sleeper_or_burner, &l); |
| 172 | wait_ready(); |
| 173 | } |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 174 | |
| 175 | p.name = "Petaouchnok"; |
| 176 | p.burn = *threads_spec++ == 'B'; |
| 177 | p.sleep = *threads_spec++ == 'S'; |
sewardj | eefeeb7 | 2011-05-10 11:01:07 +0000 | [diff] [blame] | 178 | p.t = -1; |
| 179 | if (p.burn || p.sleep) { |
| 180 | p.t = 3; |
| 181 | pthread_create(&zzzz, NULL, sleeper_or_burner, &p); |
| 182 | wait_ready(); |
| 183 | } |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 184 | |
| 185 | m.name = "main"; |
| 186 | m.burn = *threads_spec++ == 'B'; |
| 187 | m.sleep = *threads_spec++ == 'S'; |
| 188 | m.t = 0; |
| 189 | sleeper_or_burner(&m); |
| 190 | |
sewardj | eefeeb7 | 2011-05-10 11:01:07 +0000 | [diff] [blame] | 191 | if (b.t != -1) pthread_join(ebbr, NULL); |
| 192 | if (l.t != -1) pthread_join(egll, NULL); |
| 193 | if (p.t != -1) pthread_join(zzzz, NULL); |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 194 | |
| 195 | return 0; |
| 196 | } |