1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 3 // The test tries to provoke internal allocator to be locked during fork 4 // and then force the child process to use the internal allocator. 5 6 #include "../test.h" 7 #include <errno.h> 8 #include <sys/types.h> 9 #include <sys/wait.h> 10 11 static void *forker(void *arg) { 12 void *p = calloc(1, 16); 13 static_cast<volatile int *>(p)[0]++; 14 __atomic_fetch_add(static_cast<int *>(p), 1, __ATOMIC_SEQ_CST); 15 int pid = fork(); 16 if (pid < 0) { 17 fprintf(stderr, "failed to fork (%d)\n", errno); 18 exit(1); 19 } 20 if (pid == 0) { 21 __atomic_fetch_add(&static_cast<int *>(p)[1], 1, __ATOMIC_SEQ_CST); 22 exit(0); 23 } 24 int status = 0; 25 while (waitpid(pid, &status, 0) != pid) { 26 } 27 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 28 fprintf(stderr, "subprocess failed (%d)\n", status); 29 exit(1); 30 } 31 free(p); 32 return 0; 33 } 34 35 int main() { 36 for (int i = 0; i < 10; i++) { 37 pthread_t threads[100]; 38 for (auto &th : threads) 39 pthread_create(&th, 0, forker, 0); 40 for (auto th : threads) 41 pthread_join(th, 0); 42 } 43 fprintf(stderr, "DONE\n"); 44 } 45 46 // CHECK: DONE 47