1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 #include "test.h" 3 #include <errno.h> 4 #include <sys/mman.h> 5 6 void *SubWorker(void *arg) { 7 (void)arg; 8 const int kMmapSize = 65536; 9 for (int i = 0; i < 500; i++) { 10 int *ptr = (int*)mmap(0, kMmapSize, PROT_READ | PROT_WRITE, 11 MAP_PRIVATE | MAP_ANON, -1, 0); 12 if (ptr == MAP_FAILED) 13 exit(printf("mmap failed: %d\n", errno)); 14 *ptr = 42; 15 if (munmap(ptr, kMmapSize)) 16 exit(printf("munmap failed: %d\n", errno)); 17 } 18 return 0; 19 } 20 21 void *Worker1(void *arg) { 22 (void)arg; 23 pthread_t th[4]; 24 for (int i = 0; i < 4; i++) { 25 if (pthread_create(&th[i], 0, SubWorker, 0)) 26 exit(printf("pthread_create failed: %d\n", errno)); 27 } 28 for (int i = 0; i < 4; i++) { 29 if (pthread_join(th[i], 0)) 30 exit(printf("pthread_join failed: %d\n", errno)); 31 } 32 return 0; 33 } 34 35 void *Worker(void *arg) { 36 (void)arg; 37 pthread_t th[4]; 38 for (int i = 0; i < 4; i++) { 39 if (pthread_create(&th[i], 0, Worker1, 0)) 40 exit(printf("pthread_create failed: %d\n", errno)); 41 } 42 for (int i = 0; i < 4; i++) { 43 if (pthread_join(th[i], 0)) 44 exit(printf("pthread_join failed: %d\n", errno)); 45 } 46 return 0; 47 } 48 49 int main() { 50 // This test is flaky on several builders: 51 // https://groups.google.com/d/msg/llvm-dev/KUFPdLhBN3Q/L75rwW9xBgAJ 52 // The cause is unknown (lit hides test output on failures). 53 #if 0 54 pthread_t th[4]; 55 for (int i = 0; i < 4; i++) { 56 if (pthread_create(&th[i], 0, Worker, 0)) 57 exit(printf("pthread_create failed: %d\n", errno)); 58 } 59 for (int i = 0; i < 4; i++) { 60 if (pthread_join(th[i], 0)) 61 exit(printf("pthread_join failed: %d\n", errno)); 62 } 63 #endif 64 fprintf(stderr, "DONE\n"); 65 } 66 67 // CHECK: DONE 68