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      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 }
     25 // will be invoked from gdb.
     26 static void whoami(char *msg) __attribute__((unused));
     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;
    134   char *some_mem __attribute__((unused)) = malloc(100);
    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';
    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   }
    164 
    165   l.name = "London";
    166   l.burn = *threads_spec++ == 'B';
    167   l.sleep = *threads_spec++ == 'S';
    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   }
    174 
    175   p.name = "Petaouchnok";
    176   p.burn = *threads_spec++ == 'B';
    177   p.sleep = *threads_spec++ == 'S';
    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   }
    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 
    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);
    194 
    195   return 0;
    196 }
    197