68 lines · cpp
1// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2// This test is flaky on several builders:3// https://groups.google.com/d/msg/llvm-dev/KUFPdLhBN3Q/L75rwW9xBgAJ4// The cause is unknown (lit hides test output on failures).5// Let's try to re-enable it at least in one configutaion.6// REQUIRES: linux, x86_64-target-arch7#include "test.h"8#include <errno.h>9#include <sys/mman.h>10 11void *SubWorker(void *arg) {12 (void)arg;13 const int kMmapSize = 65536;14 for (int i = 0; i < 500; i++) {15 int *ptr = (int*)mmap(0, kMmapSize, PROT_READ | PROT_WRITE,16 MAP_PRIVATE | MAP_ANON, -1, 0);17 if (ptr == MAP_FAILED)18 exit(printf("mmap failed: %d\n", errno));19 *ptr = 42;20 if (munmap(ptr, kMmapSize))21 exit(printf("munmap failed: %d\n", errno));22 }23 return 0;24}25 26void *Worker1(void *arg) {27 (void)arg;28 pthread_t th[4];29 for (int i = 0; i < 4; i++) {30 if (pthread_create(&th[i], 0, SubWorker, 0))31 exit(printf("pthread_create failed: %d\n", errno));32 }33 for (int i = 0; i < 4; i++) {34 if (pthread_join(th[i], 0))35 exit(printf("pthread_join failed: %d\n", errno));36 }37 return 0;38}39 40void *Worker(void *arg) {41 (void)arg;42 pthread_t th[4];43 for (int i = 0; i < 4; i++) {44 if (pthread_create(&th[i], 0, Worker1, 0))45 exit(printf("pthread_create failed: %d\n", errno));46 }47 for (int i = 0; i < 4; i++) {48 if (pthread_join(th[i], 0))49 exit(printf("pthread_join failed: %d\n", errno));50 }51 return 0;52}53 54int main() {55 pthread_t th[4];56 for (int i = 0; i < 4; i++) {57 if (pthread_create(&th[i], 0, Worker, 0))58 exit(printf("pthread_create failed: %d\n", errno));59 }60 for (int i = 0; i < 4; i++) {61 if (pthread_join(th[i], 0))62 exit(printf("pthread_join failed: %d\n", errno));63 }64 fprintf(stderr, "DONE\n");65}66 67// CHECK: DONE68