1 | #include <stdio.h>
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2 | #include <stdlib.h>
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3 | #include <clib/cfathread.h>
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4 | #include <bits/defs.hfa>
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5 |
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6 | extern "C" {
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7 | void _exit(int status);
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8 | }
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9 |
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10 | thread_local struct drand48_data buffer = { 0 };
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11 | int myrand() {
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12 | long int result;
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13 | lrand48_r(&buffer, &result);
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14 | return result;
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15 | }
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16 |
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17 |
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18 | enum Constants { blocked_size = 20 };
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19 | cfathread_t volatile blocked[blocked_size];
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20 |
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21 | void * Worker( void * ) {
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22 | for(int i = 0; i < 1000; i++) {
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23 | int idx = myrand() % blocked_size;
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24 | if(blocked[idx]) {
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25 | cfathread_t thrd = __atomic_exchange_n(&blocked[idx], NULL, __ATOMIC_SEQ_CST);
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26 | cfathread_unpark( thrd );
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27 | } else {
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28 | cfathread_t thrd = __atomic_exchange_n(&blocked[idx], cfathread_self(), __ATOMIC_SEQ_CST);
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29 | cfathread_unpark( thrd );
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30 | cfathread_park();
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31 | }
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32 | }
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33 | printf("Done\n");
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34 | return NULL;
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35 | }
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36 |
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37 | volatile bool stop;
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38 | void * Unparker( void * ) {
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39 | while(!stop) {
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40 | int idx = myrand() % blocked_size;
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41 | cfathread_t thrd = __atomic_exchange_n(&blocked[idx], NULL, __ATOMIC_SEQ_CST);
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42 | cfathread_unpark( thrd );
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43 | int r = myrand() % 20;
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44 | for( int i = 0; i < r; i++ ) {
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45 | cfathread_yield();
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46 | }
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47 | }
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48 | printf("Done Unparker\n");
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49 | return NULL;
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50 | }
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51 |
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52 |
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53 | int main() {
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54 | stop = false;
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55 | for(int i = 0; i < blocked_size; i++) {
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56 | blocked[i] = NULL;
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57 | }
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58 |
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59 | cfathread_cluster_t cl = cfathread_cluster_self();
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60 |
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61 | cfathread_cluster_add_worker( cl, NULL, NULL, NULL );
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62 | cfathread_cluster_add_worker( cl, NULL, NULL, NULL );
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63 | cfathread_cluster_add_worker( cl, NULL, NULL, NULL );
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64 |
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65 | cfathread_attr_t attr;
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66 | cfathread_attr_init(&attr);
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67 | cfathread_attr_setcluster(&attr, cl);
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68 |
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69 | cfathread_t u;
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70 | cfathread_create( &u, &attr, Unparker, NULL );
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71 | {
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72 | cfathread_t t[20];
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73 | for(int i = 0; i < 20; i++) {
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74 | cfathread_create( &t[i], &attr, Worker, NULL );
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75 | }
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76 | for(int i = 0; i < 20; i++) {
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77 | cfathread_join( t[i], NULL );
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78 | }
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79 | }
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80 | stop = true;
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81 | cfathread_join(u, NULL);
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82 | cfathread_attr_destroy(&attr);
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83 | fflush(stdout);
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84 | _exit(0);
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85 | }
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