15d71de26cedae3dafc17449fe0182045c0bd20e8Stephen Hines// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
27be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <pthread.h>
37be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <stdio.h>
47be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <unistd.h>
57be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <sys/types.h>
67be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <sys/stat.h>
77be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany#include <fcntl.h>
82d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines#include <unistd.h>
92d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines#include <errno.h>
107be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany
117be1cc87ba99036519437518ec8eb9231916241bKostya Serebryanyint fd;
127be1cc87ba99036519437518ec8eb9231916241bKostya Serebryanychar buf;
137be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany
147be1cc87ba99036519437518ec8eb9231916241bKostya Serebryanyvoid *Thread(void *x) {
152d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines  sleep(1);
167be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  read(fd, &buf, 1);
177be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  return NULL;
187be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany}
197be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany
207be1cc87ba99036519437518ec8eb9231916241bKostya Serebryanyint main() {
217be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  fd = open("/dev/random", O_RDONLY);
222d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines  if (fd < 0) {
232d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines    fprintf(stderr, "failed to open /dev/random (%d)\n", errno);
242d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines    return 1;
252d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines  }
267be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  pthread_t t[2];
277be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  pthread_create(&t[0], NULL, Thread, NULL);
287be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  pthread_create(&t[1], NULL, Thread, NULL);
297be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  pthread_join(t[0], NULL);
307be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  pthread_join(t[1], NULL);
317be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany  close(fd);
322d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines  fprintf(stderr, "DONE\n");
337be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany}
347be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany
357be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany// CHECK: WARNING: ThreadSanitizer: data race
367be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany// CHECK:   Write of size 1
377be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany// CHECK:     #0 read
387be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany// CHECK:   Previous write of size 1
397be1cc87ba99036519437518ec8eb9231916241bKostya Serebryany// CHECK:     #0 read
402d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines// CHECK: DONE
412d1fdb26e458c4ddc04155c1d421bced3ba90cd0Stephen Hines
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