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150
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1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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236
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2 // UNSUPPORTED: ios
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3
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150
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4 #include <pthread.h>
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <unistd.h>
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8 #include <sys/types.h>
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9
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10 int fds[2];
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11 int X;
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12
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13 void *Thread1(void *x) {
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14 X = 42;
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15 write(fds[1], "a", 1);
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16 return NULL;
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17 }
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18
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19 void *Thread2(void *x) {
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20 char buf;
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21 while (read(fds[0], &buf, 1) != 1) {
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22 }
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23 X = 43;
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24 return NULL;
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25 }
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26
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27 int main() {
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28 pipe(fds);
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29 int pid = vfork();
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30 if (pid < 0) {
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31 fprintf(stderr, "FAIL to vfork\n");
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32 exit(1);
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33 }
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34 if (pid == 0) { // child
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35 // Closing of fds must not affect parent process.
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36 // Strictly saying this is undefined behavior, because vfork child is not
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37 // allowed to call any functions other than exec/exit. But this is what
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38 // openjdk does.
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39 close(fds[0]);
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40 close(fds[1]);
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41 _exit(0);
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42 }
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43 pthread_t t[2];
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44 pthread_create(&t[0], NULL, Thread1, NULL);
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45 pthread_create(&t[1], NULL, Thread2, NULL);
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46 pthread_join(t[0], NULL);
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47 pthread_join(t[1], NULL);
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48 fprintf(stderr, "DONE\n");
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49 }
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50
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51 // CHECK-NOT: WARNING: ThreadSanitizer: data race
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52 // CHECK-NOT: FAIL to vfork
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53 // CHECK: DONE
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