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      1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
      2 #include <pthread.h>
      3 #include <stdio.h>
      4 #include <stdlib.h>
      5 #include <unistd.h>
      6 #include <sys/types.h>
      7 #include <sys/socket.h>
      8 #include <netinet/in.h>
      9 #include <arpa/inet.h>
     10 
     11 struct sockaddr_in addr;
     12 int X;
     13 
     14 void *ClientThread(void *x) {
     15   X = 42;
     16   int c = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
     17   if (connect(c, (struct sockaddr*)&addr, sizeof(addr))) {
     18     perror("connect");
     19     exit(1);
     20   }
     21   if (send(c, "a", 1, 0) != 1) {
     22     perror("send");
     23     exit(1);
     24   }
     25   close(c);
     26   return NULL;
     27 }
     28 
     29 int main() {
     30   int s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
     31   addr.sin_family = AF_INET;
     32   inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
     33   addr.sin_port = INADDR_ANY;
     34   socklen_t len = sizeof(addr);
     35   bind(s, (sockaddr*)&addr, len);
     36   getsockname(s, (sockaddr*)&addr, &len);
     37   listen(s, 10);
     38   pthread_t t;
     39   pthread_create(&t, 0, ClientThread, 0);
     40   int c = accept(s, 0, 0);
     41   char buf;
     42   while (read(c, &buf, 1) != 1) {
     43   }
     44   X = 43;
     45   close(c);
     46   close(s);
     47   pthread_join(t, 0);
     48   printf("OK\n");
     49 }
     50 
     51 // CHECK-NOT: WARNING: ThreadSanitizer: data race
     52 
     53